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  • Having Many Problems with Jquery UI 1.8.1 Dialog.js

    - by chobo2
    Hi I been using the jquery ui for quite a while now. This is the first time using 1.8 though and I am not sure why but it seems to me this plugin has taken steps backwards. I never had so much difficulty to use the Jquery UI as I am having now. First the documentation is out of date. Dependencies * UI Core * UI Draggable (Optional) * UI Resizable (Optional) After line 20mins of trying and getting error after error (like dialog is not a function) I realized that you need some other javascript file called "widget.js" So now I have Jquery 1.4.2.js UI Core.js UI Widget.js UI Dialog.js all on my page. I then did something like this $('#Delete').click(function () { var dialogId = "DeleteDialogBox"; var createdDialog = MakeDialogBox(dialogId, "Delete Conformation"); $('#tabConent').after(createdDialog); dialogId = String.format('#{0}', dialogId); $(dialogId).dialog({ resizable: true, height: 500, width: 500, modal: true, buttons: { 'Delete all items': function() { $(this).dialog('close'); }, Cancel: function() { $(this).dialog('close'); } } }); }); function MakeDialogBox(id, title) { var dialog = String.format('<div id="{0}" title="{1}"></div>', id, title); return dialog; } Now what this should be doing is it makes a where the dialog box should go. After that it should put it right after my tabs. So when watching it with firebug it does this. However once does the .dialog() method it moves the + all the stuff it generates and puts it after my footer. So now I have my dialog box under my footer tucked away in the bottom right hand corner. I want it dead in the center. In previous versions I don't think it mattered where the dialog code was on your page it would always be dead center. So what am I missing? The center.js(I don't know if this exists but seems like you need 100 javascript files now to get this to work proper).

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  • jquery validation of controls

    - by Vinodtiru
    Hi , I am looking at validation of some text boxes for somethings like required, minlength, max length, email etc... I am able to get examples that work fine on submit button on page. I want to do this validation on a button click which will only raise a ajax request and not submit of page. On internet all the sample is found was with submit button. Is there a easy way to change this code a little bit o make it work for non submit button click or any new jquery or java plugin to do the same. I am using the jquery.validation.js for now. This works with submit buttons. Any kind of help with suggestion or help is appreciated. Thanks in advance.

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  • JQuery - Ajax saving sortables in connected lists when sortable item is moved

    - by Ben Sinclair
    I have multiple JQuery sortable lists that connect with each other... They allow you to assign users to certain roles. Basically what I want to do is when a user is dragged from one list to another, I want JQuery to pick up the first list that the user was moved from so that I can send an AJAX request to delete it from that list in my database. I tried the following but every time you move the user over a list and haven't even dropped it within a list, it sends this request which means I'll be sending multiple AJAX requests... Does that make sense? $( ".selector" ).sortable({ out: function(event, ui) { ... } }); From my testing, I can use the following code to just update the list that user has been moved to so I've got the second half covered: $( ".selector" ).sortable({ receive: function(event, ui) { ... } }); Hopefully I am making sense :)

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  • can you explain this jquery method from jquery.js

    - by mrblah
    Trying to understand how jquery works under the covers, what's the difference between: jQuery.fn and jQuery.prototype jQuery = window.jQuery = window.$ = function( selector, context ) { // The jQuery object is actually just the init constructor 'enhanced' return new jQuery.fn.init( selector, context ); }, and then: jQuery.fn = jQuery.prototype = { init: function( selector, context ) {

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  • JQuery UI Dialog query dialog DOM

    - by Travis
    The following simply loads a jquery-ui dialog from an external html file. $('#showdialog').click(function(e) { var div = $('<div>loading...</div>'); div.dialog({ modal: true, open: function() { div.load('anotherpage.html'); } }); e.preventDefault(); }); After the DOM loads from the external html file, I'd like to interrogate it with JQuery. For example, supposing anothorpage.html had a bunch of anchors on it, I'd like to wire up click handlers for them when it loads into the dialog. Any ideas?

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  • jQuery droppable accordion

    - by awshepard
    I've been playing around with trying to create a droppable accordion for a little while, and haven't gotten it to be very responsive. When I drag an item over the accordion, it takes 5+ seconds for the accordion element to open (if it does at all). Sometimes I have to "wave" the dragged element over the accordion element. I know I read something a while back about event processing in javascript - something along the lines of the browser not always passing control to the javascript engine when you think it does, or something like that, resulting in weird timing. Has anyone else seen tried to do this before? Have you found jquery/javascript to be this slow? Do you have any references for how to get a responsive droppable accordion (the jQuery UI site doesn't seem to, and I didn't find anything on SO or Google). Thanks!

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  • jQuery: jquery form plugin syntax?

    - by k00k
    I'm using jquery with the jquery form plugin. I read through a bunch of posts, the docs, etc., and I'm still having trouble with what I believe to be simple. I have a form with some simple text inputs and a couple textareas, and I have this link that I want to trigger submission of that form to a specific method (/email): <a id="email-data">Send Email</a> and this jquery in doc ready: $('#email-data').click(function() { var options = { url: '/email/', success: alert('Email sent.') }; $('#report-giftcard-sales-form').ajaxSubmit(options); }); So I would expect it to submit to my /email method, but no such luck. Currently I just have the /email method logging a debug message, so it's as simple as can be. Any help is greatly appreciated.

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  • jQuery ajax not preloading images

    - by George Wiscombe
    I have a list of galleries, when you click on the title of a gallery it pulls in the contents (HTML with images). When the content is pulled in it preloads the html but not the images, any ideas? This is the JavaScript i'm using: $('#ajax-load').ajaxStart(function() { $(this).show(); }).ajaxStop(function() { $(this).hide();}); // PORTFOLIO SECTION // Hide project details on load $('.project > .details').hide(); // Slide details up / down on click $('.ajax > .header').click(function () { if ($(this).siblings(".details").is(":hidden")) { var detailUrl = $(this).find("a").attr("href"); var $details = $(this).siblings(".details"); $.ajax({ url: detailUrl, data: "", type: "GET", success: function(data) { $details.empty(); $details.html(data); $details.find("ul.project-nav").tabs($details.find(".pane"), {effect: 'fade'}); $details.slideDown("slow"); }}); } else {$(this).siblings(".details").slideUp();} return false; }); You can see this demonstrated at http://www.georgewiscombe.com Thanks in advance!

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  • How can I check if a particular jQuery UI function is available and use a different function if it i

    - by Mark B
    I'm writing a jQuery plugin and I would like my code to take advantage of the jQuery UI show(effect, [options], [speed], [callback]) and hide(effect, [options], [speed], [callback]) functions, which allow you to show and hide elements with a nice animation. However, I'd also like my plugin to degrade gracefully if jQuery UI isn't available, switching back to use the basic, non-animating show() and hide() functions present in the standard jQuery API. I'll need to test for the show and hide functions specifically, as even if jQuery UI is available it could potentially be a custom version, without the Effects components included. At first I thought that I might be able to do something like: if(typeof myelement.show('blind', 'slow') == 'undefined') { myelement.show('blind', 'slow'); } else { myelement.show(); } But of course this doesn't work, as even if UI isn't present, show() is still a function, it just has a different signature—so typeof returns object in either case. So, what's the best way for me to check if jQuery UI is available to my plugin? Any help is much appreciated!

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  • Combinig JQuery datapicker with input field validation /filter

    - by Olav
    I am using the JQueryui Datepicker. But it doesn't really affect values entered manually in the input-field. Is there some way I can use the same (client) code to specify mask / validation on the input field (when the datapicker is not used - not just have datepicker output the correct format). What would be the most consistent way to do this in the JQuery framework? Thanks Remarks It seems jQuery put som restraints on input (I.e. I can only enter digits- mask "yymmdd") so the main thing is to get validation.

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  • next previous button in div jquery mobile

    - by satine kianne
    i have a total of 11 div in my app. what i want to do is to display 3 divs in between 2 permanent div it should look like this |first permanent div| |div 1| |div 2| |div 3| |second permanent div| |previous| |next| when i click on next is should look like this |first permanent div| |div 2| |div 3| |div 4| |second permanent div| |previous| |next| and so on. and when im not div 1,2,3 the previous should be disabled and when im no 7,8,9 the next should be disabled. but i cant make it i'm using this fiddle as a sample http://jsfiddle.net/WGkPV/1/ its working but only one div is shown in the center of my two permanent div which is not in my plan.im getting like this |first permanent div| |div 1| |second permanent div| |previous| |next| any suggestion will be taken seriously. here is the code of the fiddle im working on as tutorial $(document).ready(function () { var divs = $('.mydivs>div'); var now = 0; // currently shown div divs.hide().first().show(); $("button[name=next]").click(function (e) { divs.eq(now).hide(); now = (now + 1 < divs.length) ? now + 1 : 0; divs.eq(now).show(); // show next }); $("button[name=prev]").click(function (e) { divs.eq(now).hide(); now = (now > 0) ? now - 1 : divs.length - 1; divs.eq(now).show(); // or .css('display','block'); //console.log(divs.length, now); }); }); <div class="mydivs"> <div>div 1</div> <div>div 2</div> <div>div 3</div> <div>div 4</div> </div>

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  • wxPython - Running built in event prior to custom bound event

    - by jhaukur
    I'm trying to figure out how I can specify that the mouse_down event in wxPython (StyledTextCtrl) is first handled by the built in event listener, which changes the caret position, and then handled by my own custom event handler. To bind the custom event handler I use wx.EVT_LEFT_DOWN(self.styCtrl, self.OnMouseClick) def OnMouseClick(self, evt): evt.Skip() foo() I want the built in event handler to fire and complete prior to foo().

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  • jQuery Selectors: how to access an a tag, whose span has a specific class?

    - by Paul
    I'm messing around with FullCalendar jQuery calendar, and qTips, so that I can display more information about the event upon mouseover. I've added a summary element to the FullCalendar js, and also my server code. I then added a new qTip in the eventMouseover method, based on the span class, which works prefectly. However, if the event stretches over a couple of days, the qTip only works (because it is a span tag), on the text itself, not the entire blue strip. What I want to do is to assign the qTip to the a tag, and make the a tags display block. This works currently: eventMouseover: function(event){ $('span[class=fc-event-title]').each(function() { if( $(this).text() == event.title ) { $(this).qtip({ content: event.summary, style: { border: { width: 1, radius: 5, color: '#6699CC' }, width: 200 } }); } }); but I can't figure out how to select the a tag where it contains a span with class of fc-event-title. Many thanks for any assistance.

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  • Jquery autocomplete UI - No results on multiple fields

    - by pjammer
    Andrew's answer to my comment has sparked this question. According to his awesome answer in the link above, the code at the bottom of the question will only work for ONE widget. But it's killer nice code and makes sense... I guess I want the best of both worlds. Nice JS, (if that is possible) and to have the zero results show() just the element that we're using at the time. This code snippet is the main crux of my problem, as I see it: source: function (request, response) { jQuery.ajax({ url: "/autocomplete.json", data: { term: request.term }, success: function (data) { if (data.length == 0) { jQuery('span.guest_investor_email').show(); jQuery('span.investor_field_delete_button').show(); } response(data); } }); Currently: I have a button on my page that says "Add more Information" and each time you click it, a new instance of the autocomplete text field appears, complete with some hidden fields and a display:none; on guest_investor_email. If I use the autocomplete text field, say 3 times, and i have 3 autocomplete instances on the page and the third one finds 0 results: The code will show() all 3 instances of the guest_investor_email text field, instead of just this one that is blank. QUESTION: How do i get something like jQuery(this).siblings(('span.guest_investor_email').show(); to work? this is an Object and not an array of elements to select. If it isn't with this I don't mind, as long as I know how to get at it. Thanks. Full Code: jQuery(".auto_search_complete").live("click", function() { jQuery(this).autocomplete({ minLength: 3, source: function (request, response) { jQuery.ajax({ url: "/autocomplete.json", data: { term: request.term }, success: function (data) { if (data.length == 0) { jQuery('span.guest_investor_email').show(); jQuery('span.investor_field_delete_button').show(); } response(data); } }); }, focus: function(event, ui) { jQuery(this).val(ui.item.user ? ui.item.user.name : ui.item.pitch.name); return false; }, select: function(event, ui) { jQuery(this).val(ui.item.user ? ui.item.user.name : ui.item.pitch.name); jQuery(this).siblings('div.hidden_fields').children('.poly_id').val(ui.item.user ? ui.item.user.id : ui.item.pitch.id); jQuery(this).siblings('div.hidden_fields').children('.poly_type').val(ui.item.user ? "User" : "Pitch"); jQuery(this).siblings('span.guest_investor_email').hide(); jQuery(this).siblings('span.investor_field_delete_button').show(); jQuery(this).attr('readonly','readonly'); jQuery(this).attr('id', "investor-selected"); return false; } }).each(function() { jQuery(this).data( "autocomplete" )._renderItem = function( ul, item ) { return jQuery( "" ) .data( "item.autocomplete", item ) .append("" + (item.user ? item.user.name : item.pitch.name) + "" + (item.user ? item.user.investor_type : item.pitch.investor_type) + " - " + (item.user ? item.user.city : item.pitch.city) + "" ) .appendTo( ul ); }; }); });

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  • Cutom event dispatchment location

    - by Martino Wullems
    Hello, I've been looking into custom event (listeners) for quite some time, but never succeeded in making one. There are so many different mehods, extending the Event class, but also Extending the EventDispatcher class, very confusing! I want to settle with this once and for all and learn the appriopate technique. package{ import flash.events.Event; public class CustomEvent extends Event{ public static const TEST:String = 'test'; //what exac is the purpose of the value in the string? public var data:Object; public function CustomEvent(type:String, bubbles:Boolean = false, cancelable:Boolean = false, data:Object = null):void { this.data = data; super(); } } } As far as I know a custom class where you set the requirements for the event to be dispatched has to be made: package { import flash.display.MovieClip; public class TestClass extends MovieClip { public function TestClass():void { if (ConditionForHoldToComplete == true) { dispatchEvent(new Event(CustomEvent.TEST)); } } } } I'm not sure if this is correct, but it should be something along the lines of this. Now What I want is something like a mouseevent, which can be applied to a target and does not require a specific class. It would have to work something like this: package com.op_pad._events{ import flash.events.MouseEvent; import flash.utils.Timer; import flash.events.TimerEvent; import flash.events.EventDispatcher; import flash.events.Event; public class HoldEvent extends Event { public static const HOLD_COMPLETE:String = "hold completed"; var timer:Timer; public function SpriteEvent(type:String, bubbles:Boolean=true, cancelable:Boolean=false) { super( type, bubbles, cancelable ); timer = new Timer(1000, 1); //somehow find the target where is event is placed upon -> target.addEventlistener target.addEventListener(MouseEvent.MOUSE_DOWN, startTimer); target.addEventListener(MouseEvent.MOUSE_UP, stopTimer); } public override function clone():Event { return new SpriteEvent(type, bubbles, cancelable); } public override function toString():String { return formatToString("MovieEvent", "type", "bubbles", "cancelable", "eventPhase"); } ////////////////////////////////// ///// c o n d i t i o n s ///// ////////////////////////////////// private function startTimer(e:MouseEvent):void { timer.start(); timer.addEventListener(TimerEvent.TIMER_COMPLETE, complete); } private function stopTimer(e:MouseEvent):void { timer.stop() } public function complete(e:TimerEvent):void { dispatchEvent(new HoldEvent(HoldEvent.HOLD_COMPLETE)); } } } This obviously won't work, but should give you an idea of what I want to achieve. This should be possible because mouseevent can be applied to about everything.The main problem is that I don't know where I should set the requirements for the event to be executed to be able to apply it to movieclips and sprites. Thanks in advance

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  • jQuery Validate - require at least one field in a group to be filled

    - by Nathan Long
    I'm using the excellent jQuery Validate Plugin to validate some forms. On one form, I need to ensure that the user fills in at least one of a group of fields. I think I've got a pretty good solution, and wanted to share it. Please suggest any improvements you can think of. Finding no built-in way to do this, I searched and found Rebecca Murphey's custom validation method, which was very helpful. I improved this in three ways: To let you pass in a selector for the group of fields To let you specify how many of that group must be filled for validation to pass To show all inputs in the group as passing validation as soon as one of them passes validation. So you can say "at least X inputs that match selector Y must be filled." The end result is a rule like this: partnumber: { require_from_group: [2,".productinfo"] } //The partnumber input will validate if //at least 2 `.productinfo` inputs are filled For best results, put this rule AFTER any formatting rules for that field (like "must contain only numbers", etc). This way, if the user gets an error from this rule and starts filling out one of the fields, they will get immediate feedback about the formatting required without having to fill another field first. Item #3 assumes that you're adding a class of .checked to your error messages upon successful validation. You can do this as follows, as demonstrated here. success: function(label) { label.html(" ").addClass("checked"); } As in the demo linked above, I use CSS to give each span.error an X image as its background, unless it has the class .checked, in which case it gets a check mark image. Here's my code so far: jQuery.validator.addMethod("require_from_group", function(value, element, options) { // From the options array, find out what selector matches // our group of inputs and how many of them should be filled. numberRequired = options[0]; selector = options[1]; var commonParent = $(element).parents('form'); var numberFilled = 0; commonParent.find(selector).each(function(){ // Look through fields matching our selector and total up // how many of them have been filled if ($(this).val()) { numberFilled++; } }); if (numberFilled >= numberRequired) { // This part is a bit of a hack - we make these // fields look like they've passed validation by // hiding their error messages, etc. Strictly speaking, // they haven't been re-validated, though, so it's possible // that we're hiding another validation problem. But there's // no way (that I know of) to trigger actual re-validation, // and in any case, any other errors will pop back up when // the user tries to submit the form. // If anyone knows a way to re-validate, please comment. // // For imputs matching our selector, remove error class // from their text. commonParent.find(selector).removeClass('error'); // Also look for inserted error messages and mark them // with class 'checked' var remainingErrors = commonParent.find(selector) .next('label.error').not('.checked'); remainingErrors.text("").addClass('checked'); // Tell the Validate plugin that this test passed return true; } // The {0} in the next line is the 0th item in the options array }, jQuery.format("Please fill out at least {0} of these fields.")); Questions? Comments?

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  • jQuery sortable Div's

    - by kai lange
    is it possible to sort direct between two or more div's/boxe's and return the complete data (var order = ...) ? Online Demo: http://jsbin.com/alegu4 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>jQuery Dynamic Drag'n Drop</title> <script type="text/javascript" src="http://cdn.jquerytools.org/1.2.5/jquery.tools.min.js"></script> <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.8/jquery-ui.min.js"></script> <style> body { font-family: Arial, Helvetica, sans-serif; font-size: 16px; margin-top: 10px; } ul { margin: 0; } #s1,#s2 { float: left; width: 400px; } #s1 li,#s2 li { list-style: none; margin: 0 0 4px 0; padding: 10px; background-color:#00CCCC; border: #CCCCCC solid 1px; color:#fff; } </style> <script type="text/javascript"> $(document).ready(function(){ $(function() { $("#s1 ul,#s2 ul").sortable({ opacity: 0.6, cursor: 'move', update: function() { var order = $(this).sortable("serialize") + '&action=updateRecordsListings'; //$.post("updateDB.php", order); alert(order); } }); }); }); </script> </head> <body> <div id="box"> <div class="box" id="s1"> <ul> <li id="recordsArray_1">1. Lorem ipsum dolor sit amet, consetetur</li> <li id="recordsArray_2">2. Lorem ipsum dolor sit amet, consetetur</li> <li id="recordsArray_3">3. Lorem ipsum dolor sit amet, consetetur</li> <li id="recordsArray_4">4. Lorem ipsum dolor sit amet, consetetur</li> </ul> </div> <div class="box" id="s2"> <ul> <li id="recordsArray_5">5. Lorem ipsum dolor sit amet, consetetur</li> <li id="recordsArray_6">6. Lorem ipsum dolor sit amet, consetetur</li> <li id="recordsArray_7">7. Lorem ipsum dolor sit amet, consetetur</li> <li id="recordsArray_8">8. Lorem ipsum dolor sit amet, consetetur</li> </ul> </div> </div> </body> </html> Please note it's not the same like my other post - thanks!

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  • Option Trading: Getting the most out of the event session options

    - by extended_events
    You can control different aspects of how an event session behaves by setting the event session options as part of the CREATE EVENT SESSION DDL. The default settings for the event session options are designed to handle most of the common event collection situations so I generally recommend that you just use the defaults. Like everything in the real world though, there are going to be a handful of “special cases” that require something different. This post focuses on identifying the special cases and the correct use of the options to accommodate those cases. There is a reason it’s called Default The default session options specify a total event buffer size of 4 MB with a 30 second latency. Translating this into human terms; this means that our default behavior is that the system will start processing events from the event buffer when we reach about 1.3 MB of events or after 30 seconds, which ever comes first. Aside: What’s up with the 1.3 MB, I thought you said the buffer was 4 MB?The Extended Events engine takes the total buffer size specified by MAX_MEMORY (4MB by default) and divides it into 3 equally sized buffers. This is done so that a session can be publishing events to one buffer while other buffers are being processed. There are always at least three buffers; how to get more than three is covered later. Using this configuration, the Extended Events engine can “keep up” with most event sessions on standard workloads. Why is this? The fact is that most events are small, really small; on the order of a couple hundred bytes. Even when you start considering events that carry dynamically sized data (eg. binary, text, etc.) or adding actions that collect additional data, the total size of the event is still likely to be pretty small. This means that each buffer can likely hold thousands of events before it has to be processed. When the event buffers are finally processed there is an economy of scale achieved since most targets support bulk processing of the events so they are processed at the buffer level rather than the individual event level. When all this is working together it’s more likely that a full buffer will be processed and put back into the ready queue before the remaining buffers (remember, there are at least three) are full. I know what you’re going to say: “My server is exceptional! My workload is so massive it defies categorization!” OK, maybe you weren’t going to say that exactly, but you were probably thinking it. The point is that there are situations that won’t be covered by the Default, but that’s a good place to start and this post assumes you’ve started there so that you have something to look at in order to determine if you do have a special case that needs different settings. So let’s get to the special cases… What event just fired?! How about now?! Now?! If you believe the commercial adage from Heinz Ketchup (Heinz Slow Good Ketchup ad on You Tube), some things are worth the wait. This is not a belief held by most DBAs, particularly DBAs who are looking for an answer to a troubleshooting question fast. If you’re one of these anxious DBAs, or maybe just a Program Manager doing a demo, then 30 seconds might be longer than you’re comfortable waiting. If you find yourself in this situation then consider changing the MAX_DISPATCH_LATENCY option for your event session. This option will force the event buffers to be processed based on your time schedule. This option only makes sense for the asynchronous targets since those are the ones where we allow events to build up in the event buffer – if you’re using one of the synchronous targets this option isn’t relevant. Avoid forgotten events by increasing your memory Have you ever had one of those days where you keep forgetting things? That can happen in Extended Events too; we call it dropped events. In order to optimizes for server performance and help ensure that the Extended Events doesn’t block the server if to drop events that can’t be published to a buffer because the buffer is full. You can determine if events are being dropped from a session by querying the dm_xe_sessions DMV and looking at the dropped_event_count field. Aside: Should you care if you’re dropping events?Maybe not – think about why you’re collecting data in the first place and whether you’re really going to miss a few dropped events. For example, if you’re collecting query duration stats over thousands of executions of a query it won’t make a huge difference to miss a couple executions. Use your best judgment. If you find that your session is dropping events it means that the event buffer is not large enough to handle the volume of events that are being published. There are two ways to address this problem. First, you could collect fewer events – examine you session to see if you are over collecting. Do you need all the actions you’ve specified? Could you apply a predicate to be more specific about when you fire the event? Assuming the session is defined correctly, the next option is to change the MAX_MEMORY option to a larger number. Picking the right event buffer size might take some trial and error, but a good place to start is with the number of dropped events compared to the number you’ve collected. Aside: There are three different behaviors for dropping events that you specify using the EVENT_RETENTION_MODE option. The default is to allow single event loss and you should stick with this setting since it is the best choice for keeping the impact on server performance low.You’ll be tempted to use the setting to not lose any events (NO_EVENT_LOSS) – resist this urge since it can result in blocking on the server. If you’re worried that you’re losing events you should be increasing your event buffer memory as described in this section. Some events are too big to fail A less common reason for dropping an event is when an event is so large that it can’t fit into the event buffer. Even though most events are going to be small, you might find a condition that occasionally generates a very large event. You can determine if your session is dropping large events by looking at the dm_xe_sessions DMV once again, this time check the largest_event_dropped_size. If this value is larger than the size of your event buffer [remember, the size of your event buffer, by default, is max_memory / 3] then you need a large event buffer. To specify a large event buffer you set the MAX_EVENT_SIZE option to a value large enough to fit the largest event dropped based on data from the DMV. When you set this option the Extended Events engine will create two buffers of this size to accommodate these large events. As an added bonus (no extra charge) the large event buffer will also be used to store normal events in the cases where the normal event buffers are all full and waiting to be processed. (Note: This is just a side-effect, not the intended use. If you’re dropping many normal events then you should increase your normal event buffer size.) Partitioning: moving your events to a sub-division Earlier I alluded to the fact that you can configure your event session to use more than the standard three event buffers – this is called partitioning and is controlled by the MEMORY_PARTITION_MODE option. The result of setting this option is fairly easy to explain, but knowing when to use it is a bit more art than science. First the science… You can configure partitioning in three ways: None, Per NUMA Node & Per CPU. This specifies the location where sets of event buffers are created with fairly obvious implication. There are rules we follow for sub-dividing the total memory (specified by MAX_MEMORY) between all the event buffers that are specific to the mode used: None: 3 buffers (fixed)Node: 3 * number_of_nodesCPU: 2.5 * number_of_cpus Here are some examples of what this means for different Node/CPU counts: Configuration None Node CPU 2 CPUs, 1 Node 3 buffers 3 buffers 5 buffers 6 CPUs, 2 Node 3 buffers 6 buffers 15 buffers 40 CPUs, 5 Nodes 3 buffers 15 buffers 100 buffers   Aside: Buffer size on multi-processor computersAs the number of Nodes or CPUs increases, the size of the event buffer gets smaller because the total memory is sub-divided into more pieces. The defaults will hold up to this for a while since each buffer set is holding events only from the Node or CPU that it is associated with, but at some point the buffers will get too small and you’ll either see events being dropped or you’ll get an error when you create your session because you’re below the minimum buffer size. Increase the MAX_MEMORY setting to an appropriate number for the configuration. The most likely reason to start partitioning is going to be related to performance. If you notice that running an event session is impacting the performance of your server beyond a reasonably expected level [Yes, there is a reasonably expected level of work required to collect events.] then partitioning might be an answer. Before you partition you might want to check a few other things: Is your event retention set to NO_EVENT_LOSS and causing blocking? (I told you not to do this.) Consider changing your event loss mode or increasing memory. Are you over collecting and causing more work than necessary? Consider adding predicates to events or removing unnecessary events and actions from your session. Are you writing the file target to the same slow disk that you use for TempDB and your other high activity databases? <kidding> <not really> It’s always worth considering the end to end picture – if you’re writing events to a file you can be impacted by I/O, network; all the usual stuff. Assuming you’ve ruled out the obvious (and not so obvious) issues, there are performance conditions that will be addressed by partitioning. For example, it’s possible to have a successful event session (eg. no dropped events) but still see a performance impact because you have many CPUs all attempting to write to the same free buffer and having to wait in line to finish their work. This is a case where partitioning would relieve the contention between the different CPUs and likely reduce the performance impact cause by the event session. There is no DMV you can check to find these conditions – sorry – that’s where the art comes in. This is  largely a matter of experimentation. On the bright side you probably won’t need to to worry about this level of detail all that often. The performance impact of Extended Events is significantly lower than what you may be used to with SQL Trace. You will likely only care about the impact if you are trying to set up a long running event session that will be part of your everyday workload – sessions used for short term troubleshooting will likely fall into the “reasonably expected impact” category. Hey buddy – I think you forgot something OK, there are two options I didn’t cover: STARTUP_STATE & TRACK_CAUSALITY. If you want your event sessions to start automatically when the server starts, set the STARTUP_STATE option to ON. (Now there is only one option I didn’t cover.) I’m going to leave causality for another post since it’s not really related to session behavior, it’s more about event analysis. - Mike Share this post: email it! | bookmark it! | digg it! | reddit! | kick it! | live it!

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  • Adding click/double-click events to static group box controls

    - by omatai
    Having realised my own reasons were way too dubious, I've now gone about this a different way. But I'm still curious... For reasons of nostalgia, familiarity and laziness, I'm coding a UI with MFC. For dubious reasons (as if those were not enough), I wanted to add a (double-)click event to a group box. Naturally, the group box contains things - in fact, it contains another static item, to which I can successfully add a (double-)click event handler. Is there any reason I cannot get an event handler to work for clicks on my group box the same way I can do that for the simple text static item? No amount of clicking on, in or near the control fires the event. Note - I've read through http://www.codeproject.com/KB/static/staticctrl_tut.aspx and tried responding to both ON_STN_... events and ON_BN_... messages, setting the notify style (BS_NOTIFY appears in the rc file)... and still I'm missing something - what is it? Is it even possible? Most of what I've googled suggests it is... but without clear answers for C++/MFC. Since first posting this question, I've found reference to a WM_NCHITTEST message, and hints that you have to create a handler for this message to override the group box default behaviour of responding with HT_TRANSPARENT... despite having its transparent property in ClassWizard set to false. Hmmm. Can anyone confirm that this is indeed the key?

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  • Option Trading: Getting the most out of the event session options

    - by extended_events
    You can control different aspects of how an event session behaves by setting the event session options as part of the CREATE EVENT SESSION DDL. The default settings for the event session options are designed to handle most of the common event collection situations so I generally recommend that you just use the defaults. Like everything in the real world though, there are going to be a handful of “special cases” that require something different. This post focuses on identifying the special cases and the correct use of the options to accommodate those cases. There is a reason it’s called Default The default session options specify a total event buffer size of 4 MB with a 30 second latency. Translating this into human terms; this means that our default behavior is that the system will start processing events from the event buffer when we reach about 1.3 MB of events or after 30 seconds, which ever comes first. Aside: What’s up with the 1.3 MB, I thought you said the buffer was 4 MB?The Extended Events engine takes the total buffer size specified by MAX_MEMORY (4MB by default) and divides it into 3 equally sized buffers. This is done so that a session can be publishing events to one buffer while other buffers are being processed. There are always at least three buffers; how to get more than three is covered later. Using this configuration, the Extended Events engine can “keep up” with most event sessions on standard workloads. Why is this? The fact is that most events are small, really small; on the order of a couple hundred bytes. Even when you start considering events that carry dynamically sized data (eg. binary, text, etc.) or adding actions that collect additional data, the total size of the event is still likely to be pretty small. This means that each buffer can likely hold thousands of events before it has to be processed. When the event buffers are finally processed there is an economy of scale achieved since most targets support bulk processing of the events so they are processed at the buffer level rather than the individual event level. When all this is working together it’s more likely that a full buffer will be processed and put back into the ready queue before the remaining buffers (remember, there are at least three) are full. I know what you’re going to say: “My server is exceptional! My workload is so massive it defies categorization!” OK, maybe you weren’t going to say that exactly, but you were probably thinking it. The point is that there are situations that won’t be covered by the Default, but that’s a good place to start and this post assumes you’ve started there so that you have something to look at in order to determine if you do have a special case that needs different settings. So let’s get to the special cases… What event just fired?! How about now?! Now?! If you believe the commercial adage from Heinz Ketchup (Heinz Slow Good Ketchup ad on You Tube), some things are worth the wait. This is not a belief held by most DBAs, particularly DBAs who are looking for an answer to a troubleshooting question fast. If you’re one of these anxious DBAs, or maybe just a Program Manager doing a demo, then 30 seconds might be longer than you’re comfortable waiting. If you find yourself in this situation then consider changing the MAX_DISPATCH_LATENCY option for your event session. This option will force the event buffers to be processed based on your time schedule. This option only makes sense for the asynchronous targets since those are the ones where we allow events to build up in the event buffer – if you’re using one of the synchronous targets this option isn’t relevant. Avoid forgotten events by increasing your memory Have you ever had one of those days where you keep forgetting things? That can happen in Extended Events too; we call it dropped events. In order to optimizes for server performance and help ensure that the Extended Events doesn’t block the server if to drop events that can’t be published to a buffer because the buffer is full. You can determine if events are being dropped from a session by querying the dm_xe_sessions DMV and looking at the dropped_event_count field. Aside: Should you care if you’re dropping events?Maybe not – think about why you’re collecting data in the first place and whether you’re really going to miss a few dropped events. For example, if you’re collecting query duration stats over thousands of executions of a query it won’t make a huge difference to miss a couple executions. Use your best judgment. If you find that your session is dropping events it means that the event buffer is not large enough to handle the volume of events that are being published. There are two ways to address this problem. First, you could collect fewer events – examine you session to see if you are over collecting. Do you need all the actions you’ve specified? Could you apply a predicate to be more specific about when you fire the event? Assuming the session is defined correctly, the next option is to change the MAX_MEMORY option to a larger number. Picking the right event buffer size might take some trial and error, but a good place to start is with the number of dropped events compared to the number you’ve collected. Aside: There are three different behaviors for dropping events that you specify using the EVENT_RETENTION_MODE option. The default is to allow single event loss and you should stick with this setting since it is the best choice for keeping the impact on server performance low.You’ll be tempted to use the setting to not lose any events (NO_EVENT_LOSS) – resist this urge since it can result in blocking on the server. If you’re worried that you’re losing events you should be increasing your event buffer memory as described in this section. Some events are too big to fail A less common reason for dropping an event is when an event is so large that it can’t fit into the event buffer. Even though most events are going to be small, you might find a condition that occasionally generates a very large event. You can determine if your session is dropping large events by looking at the dm_xe_sessions DMV once again, this time check the largest_event_dropped_size. If this value is larger than the size of your event buffer [remember, the size of your event buffer, by default, is max_memory / 3] then you need a large event buffer. To specify a large event buffer you set the MAX_EVENT_SIZE option to a value large enough to fit the largest event dropped based on data from the DMV. When you set this option the Extended Events engine will create two buffers of this size to accommodate these large events. As an added bonus (no extra charge) the large event buffer will also be used to store normal events in the cases where the normal event buffers are all full and waiting to be processed. (Note: This is just a side-effect, not the intended use. If you’re dropping many normal events then you should increase your normal event buffer size.) Partitioning: moving your events to a sub-division Earlier I alluded to the fact that you can configure your event session to use more than the standard three event buffers – this is called partitioning and is controlled by the MEMORY_PARTITION_MODE option. The result of setting this option is fairly easy to explain, but knowing when to use it is a bit more art than science. First the science… You can configure partitioning in three ways: None, Per NUMA Node & Per CPU. This specifies the location where sets of event buffers are created with fairly obvious implication. There are rules we follow for sub-dividing the total memory (specified by MAX_MEMORY) between all the event buffers that are specific to the mode used: None: 3 buffers (fixed)Node: 3 * number_of_nodesCPU: 2.5 * number_of_cpus Here are some examples of what this means for different Node/CPU counts: Configuration None Node CPU 2 CPUs, 1 Node 3 buffers 3 buffers 5 buffers 6 CPUs, 2 Node 3 buffers 6 buffers 15 buffers 40 CPUs, 5 Nodes 3 buffers 15 buffers 100 buffers   Aside: Buffer size on multi-processor computersAs the number of Nodes or CPUs increases, the size of the event buffer gets smaller because the total memory is sub-divided into more pieces. The defaults will hold up to this for a while since each buffer set is holding events only from the Node or CPU that it is associated with, but at some point the buffers will get too small and you’ll either see events being dropped or you’ll get an error when you create your session because you’re below the minimum buffer size. Increase the MAX_MEMORY setting to an appropriate number for the configuration. The most likely reason to start partitioning is going to be related to performance. If you notice that running an event session is impacting the performance of your server beyond a reasonably expected level [Yes, there is a reasonably expected level of work required to collect events.] then partitioning might be an answer. Before you partition you might want to check a few other things: Is your event retention set to NO_EVENT_LOSS and causing blocking? (I told you not to do this.) Consider changing your event loss mode or increasing memory. Are you over collecting and causing more work than necessary? Consider adding predicates to events or removing unnecessary events and actions from your session. Are you writing the file target to the same slow disk that you use for TempDB and your other high activity databases? <kidding> <not really> It’s always worth considering the end to end picture – if you’re writing events to a file you can be impacted by I/O, network; all the usual stuff. Assuming you’ve ruled out the obvious (and not so obvious) issues, there are performance conditions that will be addressed by partitioning. For example, it’s possible to have a successful event session (eg. no dropped events) but still see a performance impact because you have many CPUs all attempting to write to the same free buffer and having to wait in line to finish their work. This is a case where partitioning would relieve the contention between the different CPUs and likely reduce the performance impact cause by the event session. There is no DMV you can check to find these conditions – sorry – that’s where the art comes in. This is  largely a matter of experimentation. On the bright side you probably won’t need to to worry about this level of detail all that often. The performance impact of Extended Events is significantly lower than what you may be used to with SQL Trace. You will likely only care about the impact if you are trying to set up a long running event session that will be part of your everyday workload – sessions used for short term troubleshooting will likely fall into the “reasonably expected impact” category. Hey buddy – I think you forgot something OK, there are two options I didn’t cover: STARTUP_STATE & TRACK_CAUSALITY. If you want your event sessions to start automatically when the server starts, set the STARTUP_STATE option to ON. (Now there is only one option I didn’t cover.) I’m going to leave causality for another post since it’s not really related to session behavior, it’s more about event analysis. - Mike Share this post: email it! | bookmark it! | digg it! | reddit! | kick it! | live it!

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  • Jquery UI Sortable - Get the item being sorted.

    - by Smickie
    Hi, When using Jquery UI Sortable (which is great by the way) how do you get the item that is currently being sorted. When you use $(this); it return the actual sortable list, not the current sorted item. I want to do fancy-pants things with the widget when the user is dragging it around. E.g. Animate it when dragging between two lists. So how do I get the current item being sorted? There a little code below just to explain a little more... $(function() { $("#sortable_1").sortable({ start : function(event, ui){ //get current element being sorted }, stop : function(event, ui){ //get current element being sorted } }).disableSelection(); });

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  • jQuery UI resizable : auto height when using east handle alone

    - by z33m
    i have a jqueryui re-sizable div. I want only the width to be re-sizable and the height to remain auto, so that the div grows or shrinks with the content. If i set it to display only the east handle and use css height:auto, after resize the height also gets set even though only the width changed. I have to set the height to auto on resize event everytime like so: resize: function(event, ui) { $(this).css('height', 'auto'); } to prevent the height from being set. Is there a better way to prevent the height from getting set when only the east handle is used?

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  • Pay Per Click Software

    - by Eddy Freeman
    What software do sites like www.shopzilla.com, www.become.com, www.kelkoo.com etc.. use for the Pay-Per-Click product listing campaigns they offer for their retailers. I am asking what kind of software do they use to know that a certain retailer's products has been clicked 50 times or 100 times(and then the cost of the click is deducted from his money-account) etc... Can someone point me to those kind of softwares? EDIT *Some Explanation :: * In a site like www.shopzilla.com, retailers will upload thier products(list their products on the site). Anytime a buyer clicks on a product to go the retailer's website, an amount of money(say $0.20) is deducted from his account(the money he has deposited in his account with shopzilla). A retailer can see how many times buyers have clicked on his products and how much money remains in his shopzilla accounts. Am looking for such softwares that comparison sites like shopzilla uses to run this type of campaigns. I hope it is clear now.

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  • Tracking click conversions with Google Analytics

    - by Joel
    Is there anyway I can use Google Analytics to track click conversions on a link? For example, if I have a link to www.a.com , is it possible for google to track the number of times that particular link was shown on my page and then track how many times it was really clicked? The problem is that I do not show the link to www.a.com every time the page loads. I am using a random function (server side) to generate a different link everytime. I would like Google Analytics to provide me with the click conversion for each of the links I choose to show the user. Thanks, Joel

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