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  • constructors and inheritance in JS

    - by nandinga
    Hi all, This is about "inheritance" in JavaScript. Supose I create a constructor Bird(), and another called Parrot() which I make to "inherit" the props of Bird by asigning an instance of it to Parrot's prototype, like the following code shows: function Bird() { this.fly = function(){}; } function Parrot() { this.talk = function(){ alert("praa!!"); }; } Parrot.prototype = new Bird(); var p = new Parrot(); p.talk(); // Alerts "praa!!" alert(p.constructor); // Alerts the Bird function!?!?! After I've created an instance of Parrot, how comes that the .constructor property of it is Bird(), and not Parrot(), which is the constructor I've used to create the object? Thanks!!

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  • using document.createDocumentFragment() child dom elements that contain jQuery.data

    - by taber
    I want to use document.createDocumentFragment() to create an optimized collection of HTML elements that contain ".data" coming from jQuery (v 1.4.2), but I'm kind of stuck on how to get the data to surface from the HTML elements. Here's my code: var genres_html = document.createDocumentFragment(); $(xmlData).find('genres').each(function(i, node) { var genre = document.createElement('a'); $(genre).addClass('button') .attr('href', 'javascript:void(0)') .html( $(node).find('genreName:first').text() ) .data('genreData', { id: $(node).find('genreID:first').text() }); genres_html.appendChild( genre.cloneNode(true) ); }); $('#list').html(genres_html); // error: $('#list a:first').data('genreData') is null alert($('#list a:first').data('genreData').id); What am I doing wrong here? I suspect it's probably something with .cloneNode() not carrying over the data when the element is appended to the documentFragment. Sometimes there are tons of rows so I want to keep things pretty optimized, speed-wise. Thanks!

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  • Passing javascript objects as function arguments

    - by Prashant
    Hello all I want to pass a javascript object (JSON) as an argument to another function. But i am getting following error: missing ] after element list the function is called on onclick event of href like "<a href='javascript:void(0);' onclick='javascript:openTab("+ sTab +");'>"+ sTab['SavedTab']['title'] +"</a><br/>"; When i pass whole value : sTab['SavedTab']['title'] , it works fine but i want to pass whole object, not just single value out of it. Please help me out. Thanks.

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  • How to programmatically determine name of CKEditor instance

    - by ChrisA
    I've added a CKEditor instance programmatically to my page in the code-behind of my ASP.NET page: VB.NET: itemEditor = New CkEditor cell.Controls.Add(itemEditor) ... which works fine. I can get the HTML on the postback and do stuff with it. However, I also want to do some client-side stuff with it, specifically take a selected item out of another control, and insert it into the text by handling the onchange event. So, how can I get the name of the editor instance in the JavaScript, so that I can do stuff like: function GetCkText() { var htmlFromEditor = CKEDITOR.instances['editorName'].getData(); // do stuff with htmlFromEditor }

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  • How to Obtain Data to Pre-Populate Forms.

    - by Stan
    The objective is to have a form reflect user's defined constraints on a search. At first, I relied entirely upon server-side scripting to achieve this; recently I tried to shift the functionality to JavaScript. On the server side, the search parameters are stored in a ColdFusion struct which makes it particularly convenient to have the data JSON'ed and sent to the client. Then it's just a matter of separately iterating over 'checkable' and text fields to reflect the user's search parameters; jQuery proved to be exceptionally effective in simplifying the workload. One observable difference lies in performance. The second method appeared to be somewhat slower and didn't work in IE8. Evidently, the returned JSON'ed struct was seen as an empty object. I'm sure it can be fixed, though before spending any more time with it, I'm curious to hear how others would approach the task. I'd gladly appreciate any suggestions. --Stan

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  • scrollTo scrolls to the top of the page

    - by yanis
    Hi, I have the following Javscript code. When the page is loaded it is scrolled to the right position. When I click on the link to run the function the page scrolls to the top of the page. Has anybody any idea how to fix it? <html> <head> <script type="text/javascript"> function scroll() { window.scrollTo(0, 400) } </script> <title></title> </head> <body onload="window.scrollTo(0, 400)"> <img src="a.jpg"/> <a href="#" onclick="scroll">comments1</a> </body> </html>

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  • remove json attribute where attribute is a variable

    - by pedalpete
    I have a news feed where items in the feed are created from JSON returned from a server. When the user takes an action on an item, I want to remove it from the object via javascript. The feed looks like this: {"newsFeed":[{"feedId":"1", "title":"item1 title", "desc":"description of the item"}, {"feedId":"2", "title":"item2 title", "desc":"description of the item"}]} I'm trying to remove a JSON attribute or entry where the feedId is passed in via a variable using jQuery. I'm not sure exactly where I'm going wrong here, but when I alert the feed before and after the removal of the object, I'm getting the same response: function removeFromFeed(feedId){ var newsFeed=jQuery('div#newsFeed').data('newsFeed'); alert(newsFeed.toSource()); delete newsFeed.feedId[feedId] jQuery('div#newsFeed').data('newsFeed',newsFeed); alert(newsFeed.toSource()); }

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  • How to get multiple value of checkbox?

    - by Poomjai
    I has checkbox the list of media in my webpage <input name="c1" type="checkbox" value=<%= item.MediaId %> />> mediaA <input name="c1" type="checkbox" value=<%= item.MediaId %> />> mediaB <input name="c1" type="checkbox" value=<%= item.MediaId %> />> mediaC In my javascript,How can i keep the checkbox value inside the array for example if user check for mediaA and mediaC in array will be {12,14} Thanks ^_^

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  • Why GWT? Advantages and Trade-Offs of Using This RIA Framework

    - by prometheus
    I'm new to stackoverflow and have been reading through a bunch of the "highest voted" questions for GWT. Several of these questions talk about the pitfalls or problems with GWT. In the articles: Which Javascript framework (jQuery vs Dojo vs … )? and Biggest GWT Pitfalls?, some posters seem to suggest that GWT is not lightweight enough or that there are better alternatives that may be used. Do most of you feel that there are problems with GWT that have not been fixed with GWT 2.0 -- which would make you inclined to suggest using a simpler framework for a new project? To some extent, shouldn't GWT be somewhat future-proof (since you don't have to worry about it changing drastically from release to release and since it is backed by Google)? I realize that the answer to this question depends greatly upon what you want to do or what you wish to make. I am looking at this from the perspective of starting a new web application that will eventually be used by millions of users.

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  • Copying data across tabs

    - by Guillermo
    Hello, I got two different forms in two different tabs. One has data from our system and the other one is an interface of another, external, system in wich we need to copy data into (XML or API integration not an option here) The this is that, having open both forms - in two different tabs - i need a greasemonkey script or something similar that allows my to copy data from one form to the other (using the getValue method in Javascript). The problem right now is that I cannot figure out how to reference with a greasemonkey script one particular tab or window (to rad data from or write data to). Do you think it would be possible to do what I'm thinking to do? THANKS

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  • Severe issues with document.GetElementById

    - by BadDayComing
    I've been using document.GetElementById succesfully but from some time on I can't make it work again. Old pages in which I used it still work but things as simple as this: <html> <head> <title>no title</title> <script type="text/javascript"> document.getElementById("ThisWillBeNull").innerHTML = "Why is this null?"; </script> </head> <body> <div id="ThisWillBeNull"></div> </body> </html> Are giving me "document.getElementById("parsedOutput") is null" all the time now. It doesnt matter if I use Firefox or Chrome or which extensions i have enabled or what headers I use for the html, it's always null and I can't find what could be wrong. Thanks for your input =)

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  • Issues with absolute paths for js files in website

    - by Vinni
    Hello guys, I have a website which has so many sub folders in it. I have following paths references to my js and css files. <link rel="stylesheet" type="text/css" href="css/styles.css" /> <script type="text/javascript" src="js/jquery.js"></script> the above code is working fine on my local machine. the JS file is not loading when i host the website into production server. Problem in my hosting server is my website is ponted to www.somewebsitename.com instead www.somewebsitename.com/home.aspx . When I load the page with www.somewebsitename.com/home.aspx this url it is loading all the js files it is not loading files only when I load the page with www.somewebsitename.com. Please solve my problem. How to reference JS files so that they ll loaded how ever u visit the page.

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  • Modal Dialog and Form Elements

    - by James Jeffery
    I have a form that contains some fields and a recaptcha box. I have hidden the recaptcha box. The user clicks "create profile" and a modal dialog pops up with the recaptcha box. All fine. But, how do I submit that information? I am using Javascript to create the recaptcha HTML in the modal. I have a button called "Create Profile" that has this code attatched to the onclick: $("#form").submit() The form data gets submitted to the create.php page, but the recaptcha info does not. Do I have to manually pass this information via the post request to create.php? Without the modal dialog it works fine. I can't understand what's going on. Any ideas?

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  • jsTree causes that links on whole page are broken

    - by niao
    Greetings, I have the following problem. In my asp.net mvc page (which is a partial view) I create an instance of jsTree as follows: <script type="text/javascript"> $(function() { $("#industries").tree({ callback: { onselect: function(NODE, TREE_OBJ) { $("#SelectedIndustryROWGUID").val($(NODE).attr("id")); $("#resultMessage").append($(NODE).attr("rel")); } }, data: { type: "json", async: true, opts: { method: "GET", url: "/CreateMessage/GetIndustries/" } } }); }); this works fine but then, when I click on any link on the page, it does not work. The links are executed when I choose "open in new tab" option from context menu. Can someone please help me with this?

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  • Prototype hide/show

    - by Kyle Sevenoaks
    Hi, I am a Javascript/jQuery/Prototype newcomer and I have a page that has a Prototype function to get info from a database and put it into some input fields. This was made before I came to work on this site and now I've been asked to add a hide/show div function. I tried it in jQuery and there were clashes with the two frameworks, (as found in my previous question). My question now is, how would I go about building a show/hide function in Prototype? I think it will be easier to do it this way than to re-build the info grabber. The page I want to add this to is here. (the green "ny kunde" button should show the div directly below it newCustomer. Thanks. :)

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  • Learning web development as I go

    - by Matt Luongo
    Hey everybody, I've been seriously preparing to take the entrepreneurship leap. I've got a great partner, and we're going to take on some minor funding, and do the thing. Our product is web-based- I'll deem it YAWA (Yet Another Web Application). Both my partner and I have database and web development experience, and I've had a front-end developer in mind for a while. Except, well- he just bowed out. I know a fair amount about the associated technologies (XHTML, CSS, Javascript and some JQuery) interface-side, but I've never had to deal with real-world scenarios, eg cross-browser design. Am I going to be able to survive without this guy? Is it realistic to believe that I can learn the details as I go?

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  • DIV menu ontop of <li> on hover

    - by Dylan Taylor
    Hey guys, this is my first time actually posting at stackflow but i've used people's answers before. Really a great site. Anywho onto my problemo. I have some 'li' tags. When I hover the mouse over these 'li's, I need a DIV to appear over the 'li' with some buttons, etc. Basically it's kind of a menu. the 'li's are an unpredictable length, usually somewhere from 1 line to 5. A great example of what I'm trying to accomp is the dribbble.com homepage. Hover over an image (though I'm using 'li's) and a nifty lil info thing comes up. I have absolutely no experience with javascript or jqry, I'm just a PHP guy with some CSS. I do the back-end work. Anywho, can anyone show me how to do this and include a basic example please? Would really really appreciate it. Help?

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  • How to re-focus to a text field when focus is lost on a HTML form?

    - by Horace Ho
    There is only one text field on a HTML form. Users input some text, press Enter, submit the form, and the form is reloaded. The main use is barcode reading. I use the following code to set the focus to the text field: <script language="javascript"> <!-- document.getElementById("#{id}").focus() //--> </script> It works most of the time (if nobody touches the screen/mouse/keyboard). However, when the user click somewhere outside the field within the browser window (the white empty space), the cursor is gone. One a single field HTML form, how can I prevent the cursor from getting lost? Or, how to re-focus the cursor inside the field after the cursor is lost? thx!

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  • How do ansynchronous methods work

    - by Polaris878
    Hello, I'm wondering if anyone can help me understand some asynchronous javascript concepts... Say I make an asynch ajax call like so: xmlhttp=new XMLHttpRequest(); xmlhttp.onreadystatechange= myFoo; xmlhttp.open("GET",url,true); Here is my callback function: function myFoo() { if (xmlhttp.readyState==4) { if (xmlhttp.status==200) { // Success message } else { // some error message } } } Now, where and when does the execution path start again? Once I make the call to open(), does execution continue directly below the open() and another "thread" enters the asynch function once the ajax request has been completed? Or, does the browser wait for the request to complete, make the Asynch call, and then execution continues right after the open? Thanks!

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  • showSettings callback in Flex?

    - by Jim Robert
    I am pretty new to flex, so forgive me if this is an obvious question. Is there a way to open the Security.showSettings (flash.system.Security) with a callback? or at least to detect if it is currently open or not? My flex application is used for streaming audio, and is normally controlled by javascript, so I keep it hidden for normal use (via absolute positioning it off the page). When I need microphone access I need to make the flash settings dialog visible, which works fine, I move it into view and open the dialog. When the user closes it, I need to move it back off the screen so they don't see an empty flex app sitting there after they change their settings. thanks :)

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  • How to overlay a small page on a html page?

    - by Usman Ajmal
    Hi, I have a webpage underconstruction. I want to notify the people who visit it about its under-construction nature. For that I wanted to show a small transparent or transluscent page on the above page as shown here http://img17.imageshack.us/i/normalpagewithasmallpag.png/ You may notice that i want that page to appear at the center of the webpage overlayed on the original page with a cross at top-right corner. Clicking on that cross may close this small page revealing the page behind it so that the users may see what has been developed so far. I hope you guys have some suggestions for me. I know its possible with javascript but don't know how...any tutorial if available will also help. Thanks a lot.

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  • implement code folding for a report with jquery

    - by Vignesh
    I'm trying to collapse or expand table rows with + and - sign displayed on the first column, using jquery. <script type="text/javascript"> $(document).ready(function() { $("tr.header").click(function () { $("tr.child", $(this).parent()).slideToggle("fast"); }); }); I'm trying to use this code. But I want the child of the parent I'm clicking on alone to be toggled. Any ideas on how to do it?

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  • SharePoint Lookup Field 20 Item JS error

    - by Chops
    Hi Everyone, I've got an issue with SharePoint Server 2007 SP1 which seems to be documented in various forms, but I haven't been able to find an answer to my seemingly simpler question. http://social.msdn.microsoft.com/Forums/en-US/sharepointcustomization/thread/040533d2-c738-4ac2-b2d6-65a1602fa2d1 Essentially, we have a form with a lookup field to another SharePoint list. The lookup field has more than 20 items, and so SharePoint changes the type/behaviour of the field as per the standard behaviour. However, with my custom skin applied, clicking on this drop down causes a JS error from within the Core.js file, as described here: http://splitnut.blogspot.com/2009/06/lookup-fields-in-moss-javascript-error.html What I haven't been able to figure out is why this is only an issue when my custom master page is applied, and not the OOTB master pages. I've been through and tried to see what might cause this, but haven't been able to track down the cause of the behaviour. Any help would be much appreciated. Many thanks.

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  • Toggle visibility of DIV based on Dropdown

    - by user1869787
    I have never used Javascript before, only HTML and CSS. I am attempting to have my information show only when selected from my drop down. I don't know any Javascript so any help would be overly appreciated. This is my html so far: <!DOCTYPE HTML> <html> <head> <meta charset="utf-8" /> <title>Gone Fishin'</title> <link href="finale.css" rel="stylesheet" type="text/css"> </head> <div id="wrapper"> <div id="nav"> <ul> <li><a href="Index.html">About Us</a></li> <li><a href="Species.html">List by Species</a></li> <li><a href="County.html">List by County</a></li> <li><a href="apply.html">Reservations</a></li> </ul> </div> <body> <div id="content"> <p>ontent</p> <fieldset> <legend>Choose your Target</legend> <select name="option" id="options"> <option value=""></option> <option value="1">American Shad</option> <option value="2">Black Crappie</option> <option value="3">Bluegill</option> <option value="4">Brook Trout</option> <option value="5">Brown Trout</option> <option value="6">Carp</option> <option value="7">Chain Pickerel</option> <option value="8">Channel Catfish</option> <option value="9">Flathead Catfish</option> <option value="10">Largemouth Bass</option> <option value="11">Muskellunge</option> <option value="12">Norhtern Pike</option> <option value="13">Pumkpinseed</option> <option value="14">Rainbow Trout</option> <option value="15">Readbreast Sunfish</option> <option value="16">Rock Bass</option> <option value="17">Sauger</option> <option value="18">Saugeye</option> <option value="19">Smallmouth Bass</option> <option value="20">Steelhead</option> <option value="21">Striped Bass</option> <option value="22">Walleye</option> <option value="23">White Bass</option> <option value="24">White Crappie</option> <option value="25">White Perch</option> <option value="26">Yellow Perch</option> </select> <div id="option"> <div id="1" style="display: block">Test 1</div> <div id="2">Test 2</div> <div id="3">Test 3</div> <div id="4">Test 4</div> <div id="5">Test 5</div> </div> </fieldset> </div> </body> </div> </html> And this is my CSS: @charset "utf-8"; /* CSS Document */ /*General Styles*/ * {font-family:Verdana, Geneva, sans-serif;} #wrapper {width:85%; margin:auto; background-color:#00CC00;} /*End of General Styles*/ /* nav div styles */ #nav {background-color:#FF0000; text-align:center;} #nav ul li {display:inline-block; background-color: #67e667; border:5px dashed; width: 90px text-align:center;} #nav ul li a:link {background-color:#a60000; width: 90px;} #nav ul li a:visited {background-color: #009999;} #nav ul li a:hover {background-color: #a64b00;} /* end nav styles */ /* content div styles*/ #content {padding: 5px;} #option {display:none;} /*end content styles*/ /*start form styles*/ fieldset {background-color:#ff7400; color:white} label {display:inline-block; width: 150px; float:left; margin-right: 3px;} #form li{margin-bottom:10px;} #dtg li{margin-bottom:5px;} Thank you for any help received

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  • Hyperlinks to download files without stopping the current page load

    - by Evgeny
    I've got an ASP.NET page that takes a long time to download and returns partial results as it's loading (as per my previous question). On the page I have some links to download files, ie. the response headers contain "Content-Disposition: attachment", so that the browser doesn't navigate away from the page. However, if the user clicks one of these links while the page is still loading it stops loading - normal behaviour, but not what I want in this case. I can get around that by adding target=_"blank" to the links, but this momentarily opens a new window and the closes it again (once the browser realises it's an "attachment"). Is there any way to avoid having those links stop the current page load without this new window trick? JavaScript is OK.

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