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• Common causes of slow performing jQuery and how to optimize the code?

  - by Polaris878

  Hello, This might be a bit of a vague or general question, but I figure it might be able to serve as a good resource for other jQuery-ers. I'm interested in common causes of slow running jQuery and how to optimize these cases. We have a good amount of jQuery/JavaScript performing actions on our page... and performance can really suffer with a large number off elements. What are some obvious performance pitfalls you know of with jQuery? What are some general optimizations a jQuery-er can do to squeeze every last bit of performance out of his/her scripts? One example: a developer may use a selector to access an element that is slower than some other way. Thanks

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• jQuery - getting the id of the item selected

  - by John Leonard

  I have a basic jQuery selector question. Let's say I'm parsing JSON and generating a row of data for each item in my result set. On each item row, I want an action button. What is the best practice to script that button so its click action can reference the data specific to that row? Starting with the block below, how do I generate a 'Click Me' button that when clicked will alert with its json data? $.getJSON(url,params,function(json){ if(json.items){ $.each(json.items, function(i, n){ var item = json.items[i];

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• JQuery Accordion - bottom-up in stead of top-down

  - by Tim Geerts

  Hi there, I have a question about the accordion plugin for jQuery. Basically, I've got it to work on my site nicely, there's just one thing that I'd have liked it to do and that is bottom-up opening in stead of top-down. What I mean by that is that my 3 buttons just stand in the vertical menu (div) in the bottom. And when you click it, they'll slide open but upwards, not downwards. Is there a way to achieve this easily? I've gone through the documentation, but can't find any native support for it, so I was wondering if it was possible to do it in the javascript of the plugin itself. Thanks in advance.

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• improve my jquery validation plugin code

  - by Jared

  Hi All Just hoping soemone can help me to write better code than I can come up with on my own. I am using the jquery validation plugin. I have some fields that are mandatory ONLY if certain options are chosen. The below code works fine. But the thing is, is that that my list of 'OR's is much longer than I've put here. and it needs to be applied not just to 'directorsName' but a whole long list of inputs, selects etc. My question is.. how can I wrap up the code contained inside the RETURN? (so I dont have to keep repeating my 'OR's. I'm guessign I need a function but I'm unsure of the syntax) $("#myForm").validate({ rules: { directorsName : { required: function(element) { return ( $('#account_for').val() == "Joint" || $('#directors_number').val() == "2" || $('#directors_number').val() == "3" ); } } } }); Thanks in advance

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• Changing multiple objects with a new class name using Jquery

  - by liquilife

  I'd like to click on a trigger and show a specific image. There are multiple triggers which would show a specific image related to it within a set. There are 4 sets The challenge for me is toggling the other images to hide only in this 'set' when one of these triggers are clicked, as there can only be one image showing at a time in each set. Here is the HTML I've put together thus far: <!-- Thumbnails which can be clicked on to toggle the larger preview image --> <div class="materials"> <a href="javascript:;" id="shirtgrey"><img src="/grey_shirt.png" height="122" width="122" /></a> <a href="javascript:;" id="shirtred"><img src="red_shirt.png" height="122" width="122" /></a> <a href="javascript:;" id="shirtblue"><img src="hblue_shirt.png" height="122" width="122" /></a> <a href="javascript:;" id="shirtgreen"><img src="green_shirt.png" height="122" width="122" /></a> </div> <div class="collars"> <a href="javascript:;" id="collargrey"><img src="grey_collar.png" height="122" width="122" /></a> <a href="javascript:;" id="collarred"><img src="red_collar.png" height="122" width="122" /></a> <a href="javascript:;" id="collarblue"><img src="blue_collar.png" height="122" width="122" /></a> <a href="javascript:;" id="collargreen"><img src="green_collar.png" height="122" width="122" /></a> </div> <div class="cuffs"> <a href="javascript:;" id="cuffgrey"><img src="grey_cuff.png" height="122" width="122" /></a> <a href="javascript:;" id="cuffred"><img src="red_cuff.png" height="122" width="122" /></a> <a href="javascript:;" id="cuffblue"><img src="blue_cuff.png" height="122" width="122" /></a> <a href="javascript:;" id="cuffgreen"><img src="/green_cuff.png" height="122" width="122" /></a> </div> <div class="pockets"> <a href="javascript:;" id="pocketgrey"><img src="grey_pocket.png" height="122" width="122" /></a> <a href="javascript:;" id="pocketred"><img src=".png" height="122" width="122" /></a> <a href="javascript:;" id="pocketblue"><img src="blue_pocket.png" height="122" width="122" /></a> <a href="javascript:;" id="pocketgreen"><img src="green_pocket.png" height="122" width="122" /></a> </div> <!-- The larger images where one from each set should be viewable at one time, triggered by the thumb clicked above --> <div class="selectionimg"> <div class="selectShirt"> <img src="grey_shirt.png" height="250" width="250" class="selectShirtGrey show" /> <img src="red_shirt.png" height="250" width="250" class="selectShirtRed hide" /> <img src="blue_shirt.png" height="250" width="250" class="selectShirtBlue hide" /> <img src="green_shirt.png" height="250" width="250" class="selectShirtGreen hide" /> </div> <div class="selectCollar"> <img src="grey_collar.png" height="250" width="250" class="selectCollarGrey show" /> <img src="red_collar.png" height="250" width="250" class="selectCollarRed hide" /> <img src="blue_collar.png" height="250" width="250" class="selectCollarBlue hide" /> <img src="green_collar.png" height="250" width="250" class="selectCollarGreen hide" /> </div> <div class="selectCuff"> <img src="grey_cuff.png" height="250" width="250" class="selectCuffGrey show" /> <img src="red_cuff.png" height="250" width="250" class="selectCuffRed hide" /> <img src="blue_cuff.png" height="250" width="250" class="selectCuffBlue hide" /> <img src="green_cuff.png" height="250" width="250" class="selectCuffGreen hide" /> </div> <div class="selectPocket"> <img src="grey_pocket.png" height="250" width="250" class="selectPocketGrey show" /> <img src="hred_pocket.png" height="250" width="250" class="selectPocketRed hide" /> <img src="blue_pocket.png" height="250" width="250" class="selectPocketBlue hide" /> <img src="green_pocket.png" height="250" width="250" class="selectPocketGreen hide" /> </div> </div> How can jQuery be used to change a class of an image to "show" and ensure that all other images in that same div are set to a class of "hide"? First time posting here. I'm very efficient with HTML and CSS and have a basic understanding of jQuery. I'm learning and this just seems a little bit beyond my abilities at the moment. I hope this all makes sense. Thanks for any help.

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• how to get li width + margin using jquery

  - by From.ME.to.YOU

  hello my code is something like this //css li{display:inline-block} //html #li margin and width are dynamic <ul> <li style='margin:30px;width:100px;'>Pic</li> <li style='margin:40px;width:200px;'>Pic</li> <li style='margin:10px;width:500px;'>Pic</li> <li style='margin:50px;width:300px;'>Pic</li> </ul> how to make a jquery function that will take an li index as an input and it will return the width of all li from the beginning to that index + margins ' left + right ' Examples // something like this myFunction(1); //output 440 (( 30 margin-left [0] + 30 margin-right [0] + 40 margin-left [1] + 40 margin-right [1] + 100 width [0] + 200 width [1] )) myFunction(2); //output 960 (( 30 margin-left [0] + 30 margin-right [0] + 40 margin-left [1] + 40 margin-right [1] + 10 margin-left [2] + 10 margin-right [2] + 100 width [0] + 200 width [1] + 500 width [2] ))

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• jQuery: use filter(), but work with both results

  - by Tomalak

  In jQuery, filter() reduces your result to those elements that fulfill a certain condition. This splits the list in two parts. Working with the "good half" of the elements is easy: $("some selector").filter(function() { // determine result... return result; }).each( /* do something */ ); But how can I work with the "other half" of my elements, too - but without doing the equivalent of this: $("some selector").filter(function() { // determine result... return !result; }).each( /* do something */ ); Basically, I'd like to feed two separate /* do something */ parts to a single filter. One for those that match, and one for the others - without having to select and filter twice.

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• Accessing a variable passed by jquery using php

  - by celenius

  How does php access a variable passed by JQuery? I have the following code: $.post("getLatLong.php", { latitude: 500000}, function(data){ alert("Data Loaded: " + data); }); but I don't understand how to access this value using php. I've tried $userLat=$_GET["latitude"]; and $userLat=$_GET[latitude]; and then I try to print out the value (to check that it worked) using: echo $userLat; but it does not return anything. I can't figure out how to access what is being passed to it.

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• Problem with accessing in DOM with jQuery

  - by Tristan

  Hello, I changed the tree of my JSON-P output, and i cannot access to my object DOM anymore : Here's my output : jsonp1271634374310( {"Inter-Medias": {"name":"Inter-Medias","idGSP":"14","average":"80","services":"8.86"} }); And here's my jQuery script : success: function(data, textStatus, XMLHttpRequest){ widget = data.name; widget += data.average ; .... I know one level is missing, but if I try to do : data.Inter-Medias.name or data.name.name it's still not working. Any idea please ? I will have case where i'll have multiple Ojbect, so i want to display all of them, how to do that ? for (i=0;i < data.length;i++) Does it look right ? Bonus question : i understand function(data, textStatus, XMLHttpRequest) that in case of success this function is triggered, the data is what the script recieved from his request, but i have no idea what textStatus or XMLHttpRequest are here too and why ?! Thank you.

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• Handling JSON and HTML templates in jQuery

  - by Toby Hede

  I have an ajax-enabled site that presents a lot of dynamic content by interpolating JSON values with HTML. This all works fine. BUT it means I have significant amounts of HTML all through my JavaScript. For example: var template = "<div>Foo: {bar}</div><div>Blah: {vtha}</div>"; template.interpolate({bar:"bar",blah:"vtha"}); I have cut this down a fair bit - some of my dynamic elements have quite a lot of HTML and a lot going on. I am using jQuery and I am building on Rails, so if there is something smart in either framework, that would be great. For reference, the String interpolation function used above is: String.prototype.interpolate = function (o) { return this.replace(/{([^{}]*)}/g, function (a, b) { var r = o[b]; return typeof r === 'string' || typeof r === 'number' ? r : a; } ); };

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• Select next element in the page source using jQuery

  - by Travis

  I have an arbitrarily deep list of the form: <ul> <li></li> <li> <ul> <li></li> </ul> </li> </ul> I am trying to build a function "nextElement" that returns a jQuery selector. The first time the function is called, it returns the first li in the list. The second time it is called, it returns the next li in the page. Etc. I'd like this function to pay no attention to siblings, parents, children, etc. All I care about is that everytime it is called, the next li in the source gets chosen. Any suggestions on how to go about approaching this? Thanks

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• jquery queue problem..

  - by user344862

  $(".menu-container").animate({top:"25px"}); $(".menu-container").animate({top:"-900px"}); $(".windows-container").animate({top:"-730px"}); hello sir.. i got a problem on queue in jquery.. what i want to do is $(".menu-container").animate({top:"25px"}); ----execute first then after this, $(".menu-container").animate({top:"-900px"}); --this one and $(".windows-container").animate({top:"-730px"}); --this one should execute at the same time.. i tried this but its not functioning.. $(".menu-container").queue(function(){ $(".menu-container").animate({top:"25px"}); $(".windows-container").animate({top:"-730px"}); $(".menu-container").animate({top:"-900px"}); });

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• YUI and/or jQuery for a new project?

  - by Hortitude

  If I am starting a new project how should I pick between using YUI 2, YUI 3 and jQuery? I know there are a bunch of questions/answers already about can you use them together, but I am trying to figure out what criteria I should be thinking about to make my decision. Are they overlapping? Is one better at GUI and the other better at internals? Do they play well together? My understanding from other questions is that they can live in different namespaces, so they can live together, but that doesn't necessarily mean that it is good to use both. Thanks!

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• JQuery Remove() doesn't work

  - by Xander Guerin

  I have a DIV element inside another as follows: <div id="filters"> <div class="filterData">hello</div> </div> and I'm trying to remove the element: $("#filters").remove('.filterData'); Problem is, it doesn't. I've tested on other elements on my page and it works. The thing is, I cannot append to it, show or hide it, use .empty. I've also changed it to be a DIV with 'filterData' as the ID and told JQuery to remove it but it refuses to... Has anyone had a stuborn element like this before? EDIT: I'm also trying to remove it inside a $(document).ready function so I have no idea.

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• Pass Success variable to code

  - by João Dias

  How can I pass a variable that has been calculated in the success callback of an ajax function, to the document.ready ? I have this code function loadActions() { var countDiv; $.ajax({ type: "POST", cache: false, url:"modules/actions/actions.php", success : function (data) { $("#actions-container").html(data); $('.action-details').hide(); countDiv = $('.action-tab-odd').length + $('.action-tab-even').length ; } }); return countDiv; } $(document).ready(function(){ var count = loadActions(); }); But count is allways undefined. How can I get this to work? Thank you

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• jQuery access each matched element from '.find' by an index

  - by GHarping

  Using jQuery's .find() method to return a set of elements, I am trying to access items in the returned set by their order in that set. For example, a table with two rows and in each row a select box and two text input fields, accessed with the following: $('table#tbl').find('tr.row').each(function(i) { }); To get the first element I would have thought I could use $('table#tbl').find('tr.row').each(function(i) { alert( $(this).find(':input').get(1).val() ); }); And variations of the above, but apparently this doesn't work. Could anyone suggest the correct method to access item x of n elements returned?

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• Master Page and Jquery Problem?

  - by user356787

  Hi all.. I have a page called AddNews.aspx and in codebehind a web method called AddNews(Parameters).. AddNews.aspx page is inherited from a master page.. So i used contentplaceholder. I have a button..It's id is btnSave. Here is jquery code: $(function() { $("[id$='_btnSave']").click(function() { $.ajax({ type: "POST", contentType: "application/json; charset=utf-8", data: $.toJSON(veriler), url: "AddNews.aspx/AddNews", dataType: "json", success: function(result) { $("#result").html('News added'); } , error: function() { alert('Problem'); } }); }); }); </script> Button click dont trigger.. What can i do? Thanks.

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• Alternative to jQuery .data()?

  - by thebossman

  I'm a big fan of jQuery's .data() method, but I can't always use it. Often times I am rendering html templates that I pass via AJAX and I need to attach metadata to each of the elements in the template. For example: <ul> {% for item in itemlist %} <li metadata="{{ item.metadata }}">{{ item.name }}</li> {% endfor %} </ul> I know attaching attributes to store data is bad practice (and it might not even work in older versions of IE). What is the best practice? Is there a good alternative to this method?

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• posting to aweber with jQuery

  - by wcpro

  Im trying to post to aweber using just jquery. I have a method call like this $(function () { $('#submit').click(function () { $.post('http://www.aweber.com/scripts/addlead.pl', { meta_web_form_id: '12345', meta_split_id: '', listname: 'some_list', redirect: '', meta_redirect_onlist: '', meta_adtracking: 'my_Web_Form', meta_message: '1', meta_required: 'name,email', meta_forward_vars: '', meta_tooltip: '', email : '[email protected]', name : 'tester testing' }, function (data) { alert('data load: ' + data); }); }); }); it is supposed to take the result of the post and alert it in a box. when i try to do it manually with forms it works but redirects me to a 'form-sorry.htm' page, which is fine, just wondering if there was a way to display the end result of the post. Im guessing hte addlead.pl is just a posting page with no response.

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• Error: Get JSON Data from Web API Using Jquery

  - by Kenneth

  I'm really new at this. And I'm really stuck. I have the jquery code, it will load data from Web API, but it does not display on my page. $.getJSON("/api/Order", function(data) { if (data != null) { var str = ''; $.each(data, function (item) { str = '<li>' + item.ItemName + '</li>'; }); $("#contents").append(str); } }); Can anyone explain what is going on? Thanks.

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• Not able to parse xml in jquery

  - by Ravi Kumar H M

  I am getting xml file path from browse button and trying to parse but it is not working.. here is my code below. I am new to jQuery.. please help $(document).ready(function(){ alert("hi") $("#uploadButton").click(function(){ var val = $("input#file").val() alert( val ) // it is displaying... $(val).find("CommandModule").each(function() { alert("inside cmdModule") // it is not displaying.. $(this).find("CommandGroup").each(function() { $(this).find("CommandExecution").each(function() { $("#test").append($(this).attr("cmdId")); }); }); // closing CommandGroup }); // closing CommandModule }); // closing Click function }); // closing ready function

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• Pass codeigniter translation array to jQuery Function

  - by grolle

  Hi, I’ve a problem by passing an array to a jQuery function. Some code: // in the language file $lang['daynames'] = array('So','Mo','Di','Mi','Do','Fr','Sa'); //In the view var config = { basePath : '' }; // THIS WORKS GREAT!!! var days = new array('lang-line('daynames')); ?'); //in the js-File $(function() { $("#datepicker").datepicker({ dateFormat : 'dd.mm.yy', showWeek : true, firstDay : 1, weekHeader : 'KW', dayNamesMin : days, monthNames : ['Januar','Februar','März','April', 'Mai','Juni','Juli','August','September', 'Oktober','November','Dezember'], onSelect : function(dateText,inst){ } }); }); If I do lang-line(‘daynames’)); ? in the view everything looks fine, so what is wrong here? Thanks and best regards ...

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• jquery draggable accept: classpath

  - by heldopslippers

  Hi guys.. I have problems with the following bit of javascript/jquery code: this.droppable = function(){ $('.imageWindow .body .item').draggable(); $('.groupWindow .body .item').droppable({ accept: $(".imageWindow .body .item"), over: function(event, ui) { alert("this is valid!"); }, drop: function(){ alert('dropped'); } }); } As you maybe know it is not possible to pass the following in the accept option: $(".imageWindow .body .item") But what is possible ? I want to pass a "class path" as an accept option ! It is probably a simple answer but i can't figure it out. Of course i could do: accept: ".item" But because "groupWindow .body .item" is a sortable it would also accept himself! Thanxs if you can help me!

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• Reload AJAX data every X minutes/seconds, jQuery

  - by NightMICU

  Hi everyone, I programmed a CMS that has a log of who has recently logged into the system. Presently, this data is fed into a jQuery UI tab via Ajax. I would like to put this information into a sidebar on the main page and load it via AJAX every 30 seconds (or some set period of time). How would I go about doing this? Does the PHP response need to be JSON coded? I am fairly new to AJAX and JSON data. Here is the PHP I am currently using to pull details from the users table- <?php $loginLog = $db->query("SELECT name_f, name_l, DATE_FORMAT(lastLogin, '%a, %b %D, %Y %h:%i %p') AS lastLogin FROM user_control ORDER BY lastLogin ASC LIMIT 10"); while ($recentLogin = $loginLog->fetch()) { echo $recentLogin['name_f'] . " " . $recentLogin['name_l'] . " - " . $recentLogin['lastLogin']; } ?> Thanks!

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• jquery custom drag and drop

  - by samlochner

  I am trying to create functionality similar to drag and drop. I need to create my own as there will be some significant differences to the drag and drop in the jquery UI. I would like to have mousemove being called repeatedly at all times, and mousedown called every time the mouse is pressed. So I have the following code: $(document).bind('mousemove',function(e){ $("#coords").text("e.pageX: " + e.pageX + ", e.pageY: " + e.pageY); }); $(document).bind('mousedown',function(e){ }); ('coords' is the id of a div) As I move the mouse, coordinates are reported correctly in 'coords'. If I depress a mouse button and then move the mouse, coordinates are still reported correctly. But if I depress a mouse button on an image and then move the mouse, coordinates are reported correctly for a few sets, and then they seize up! Why is this happening and how can I fix it? Thanks, Sam

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