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• Simple graphics API with transparency, polygons, reading image pixels?

  - by M. Elkstein

  I need a simple graphics library that supports the following functionality: Ability to draw polygons (not just rectangles!) with RGBA colors (i.e., partially transparent), Ability to load bitmap images, Ability to read current color of pixel in a given coordinate. Ideally using JavaScript or Python. Seems like HTML 5 Canvas can handle #2 and #3 but not #1, whereas SVG can handle #1 and #2 but not #3. Am I missing something (about either of these two)? Or are there other alternatives?

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• Most effective server side programming language for web development?

  - by ihaveitnow

  This is more a question of pros/cons between PHP and JAVA. Iv been doing research, and iv narrowed it down to those two. And in consideration, id like to go into mobile app dev...So thats +1 for Java. Time taken to learn the language is not an issue...Just would like to know which is the most profitable at the end of all the training. And on a slight note. Can Javascript work with Java? And what is the real advantage of that?

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• ASP.NET: How to assign ID to a field in DetailsView?

  - by jawonlee

  I have a master-detail page, in which I use GridView to display multiple rows of data, and DetailsView + jQuery dialog to display the details of a single records. only one DetailsView is open at a time. I need to be able to pull out a single field of the open DetailsView, for manipulation using JavaScript. Is there a way to give a unique ID to a given field in DetailsView, so I can use getElementByID? Or is there another way to accomplish what I'm trying to do? Thank you in advance.

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• How to get selenium to click on an object other than by ID

  - by Zombies

  So here is a little challenge. I have an image. It has 2 attributes: a random ID - not helpful an image url - but it is a button, and other buttons use the same image url, not helpful a CSS class - also used by too many other things to be helpful a style - neither helpful nor unique This image is however inside of an anchor tag, but the anchor tab isn't to a page, it just runs some javascript. Bellow is the html in question: <a id="template:j_id__ctru168pc2" title="Click for the Manual Class LOV" class="xei" style="text-decoration: none;" onclick="return false;" href="#"> <img id="template:j_id__ctru169pc2" class="xgs" style="border: 0pt none;" src="images/lov_ena.png"> </a> How can I click this image without using the ID?

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• How can I have centered text and right-aligned image in the same element?

  - by Ethan

  I have some th elements with text in them that should be centered and they also contain images: The up/down arrow graphic is a separate image. My question is, what is the simplest reliable way to position that image over to the right side of the th element while keeping the text centered? I'm open to using jQuery/JavaScript if there's a reasonably simple way to do it. One caveat: I need the up/down graphic to be a separate image, not part of the header background. <th> Title <img src='/images/sort_unsorted.jpg' /> </th>

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• jQuery selector loads images from server

  - by Guillaume

  Hi! here is the code: <script type="text/javascript"> var ajax_data = '<ul id="b-cmu-rgt-list-videos"><li><a href="{video.url}" '+ 'title="{video.title.strip}"><img src="{video.image}" '+ 'alt="{video.title.strip}" /><span>{video.title}</span></a></li></ul>'; var my_img = $(ajax_data).find('img'); </script>` ajax_data is data from a JS template engine where I need to get some part of it. The problem is that jQuery does a GET on the img src={video.image}: GET /test/%7Bvideo.image%7D HTTP/1.1 (on Firefox Live HTTP headers). This GET generates a 404 from the server. Any clues on how to solve this? Thanks a lot :)

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• Intercept close Popup from Parent Page

  - by sangi

  Hi all, I have a question. In an html page, I have javascript code that allows me to open and close a popup window by clicking on a link displayed in the link, so the text displayed in the link changes to the state of the popup window (open-closed). With a variable true / false I manage the opening and closing of the popup window to click on a link whose text is aligned "opened popup" / "closed popup". The next step is to make this same change in state (true / false, "opened popup" / "close popup") directly by closing the popup window. The idea is to not have to refresh the page. Is this possible? Thank you and best regards

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• How to Get the Method/Function Call Trace for a Specific Run?

  - by JackWM

  Given a Java or JavaScript program, after its execution, print out a sequence of calls. The calls are in invocation order. E.g. main() { A(); } A() { B(); C(); } Then the call trace should be: main -> A() -> B() -> C() Is there any tool that can profile and output this kind of information? It seems this is common a need for debugging or performance tuning. I noticed that some profilers can do this, but I prefer a simpler/easy-to-use one. Thanks!

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• how to calculate the beginning of a day given milliseconds?

  - by conman

  i want to figure out the time from the beginning of the day given a days milliseconds. so say i'm given this: 1340323100024 which is like mid day of 6/21/2012. now i want the milliseconds from the beginning of the day, which would be 1340262000000 (at least i think that's what it's supposed to be.) how do i get 1340262000000 from 1340323100024? i tried doing Math.floor(1340323100024/86400000) * 86400000 but that gives me 1340236800000, which if i create a date object out of it, says its the 20th. i know i can create a date object from 1340323100024, then get the month, year, and date, to create a new object which would give me 1340262000000, but i find it ridiculous i can't figure out something so simple. any help would be appreciated. btw, i'm doing this in javascript if it makes any difference.

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• Loading jQuery with Tapestry 5

  - by American Yak

  Okay, so I'm not a Java guy, but I work with loads of them. We generally load Prototype with Tapestry 5, as Tapestry was built on this javascript library. As a UI/front end developer/engineer, I know the awesomeness of jQuery and the lack of prototype therein. (Feel free to debate that elsewhere -- this ticket doesn't concern that question, ha.) I've been curious for some time if it's possible to port jQuery into Tapestry instead of Prototype -- as in completely removing Prototype and Scriptaculous -- I realize it kind of defeats the purpose of the already bundled Prototype, but I wanted other opinions on the matter. Thanks.

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• Is there a JS/JQuery way to find out if embedded objects are loaded?

  - by Beska

  I've got a web page that I'm embedding a pdf into. Conceptually very simple: <html> <body> blah1 <object type="application/pdf" data="a.pdf" width="500" height="650" ></object> blah2 </body> </html> What I would like to do is fire a JavaScript event when the pdf finishes loading. Is there a way to make this happen? I know only a little about JQuery, but it looks like .ready() won't fit my needs, since it is designed to fire when the html document is ready, not when all of its components are fully loaded. Thoughts?

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• How do I make a expanding textbox?

  - by jpjp

  I want to make a textbook where it starts out as a given width/height. Then if users type more then the given amount of space, the textbox expands downward. How do I go about doing this? Do I use css? The basic textbox just displays a scroll bar when users pass the number of rows allow. How do I make it so the textbox expands the rows by say 5 more? <form method="post" action=""> <textarea name="comments" cols="50" rows="5"></textarea><br> <input type="submit" value="Submit" /> </form> How do i use the example that Robert Harvey mentioned? I never used javascript before..

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• jQuery mobile 1.1.0 slider: JS-object properties access?

  - by Koniak

  EDIT: This could be seen as a pure javascript objects question. The code can be found here: jquery.mobile-1.1.0.js I need to access properties of a jQuery mobile JS-object but is not sure how that is possible. In the jquery.mobile-1.1.0.js and mobile.slider is the following (see extend on line 5967): $.widget( "mobile.slider", $.mobile.widget, { ... _create: function() { ... $.extend( this, { slider: slider, handle: handle, valuebg: valuebg, dragging: false, beforeStart: null, userModified: false, mouseMoved: false }); Primarily the property I would like to read is the "dragging". I know i can execute the methods using: $("#slider").slider("refresh") Is there a similair way to access the properties? Thanks

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• how ca i make Description panel to pause after it is shown on the slideshow?

  - by ershad

  I am new to Javascript. I have a slide show with images fading and description coming from left to right. I need to pause the description panel for some sec. How can i do that? The code is: showhidedescpanel:function(state, animateduration){ var setting=this.setting var endpoint=(state=="show")? setting.dimensions[1]-setting.panelwidth : this.setting.dimensions[1]-410 setting.$descpanel.stop().animate({left:endpoint}, (2000), function(){ if (setting.descreveal=="always" && state=="hide") setting.$restorebutton.css({visibility:'visible'}) //show restore button }) }

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• How to check if people liked my Facebook FanPage

  - by user2372419

  There are many questions and answers about this. But nowadays Facebook changes their Privacy. Any Application that request for user_likes permission must be review by Facebook before using. I've tried many times to explain to Facebook review team about my app, but they did not accept, because my application (a web game using HTML5 and JavaScript) require people like my fan page before play. So my question is: Is there any to bypass Facebook privacy? I have a Like Box on the same page as the game screen (where i need to check Like), so any solution (like: analyze DOM elements, capture screen can pass through image recognition) will fine.

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• My website crashes Firefox. What do I do?

  - by Jason Prado

  My website doesn't use Flash or any plugins; just javascript (jQuery, Google Maps). It doesn't crash FF 3.6 all the time, but it usually does after a few minutes. It can happen on lots of different pages. Sometimes it crashes when I'm scrolling the page, sometimes when I'm interacting with a control. Where do I even start debugging? Should I go through the hassle of attaching gdb to Firefox and getting a stack trace, then praying that it sheds some light on the offending code?

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• Syntax error. Help with one small JS snippet :(

  - by Bogdan

  Hey guys. I don't know much JS, but I wanted to do some quick work with jQuery. But I've been staring at this for about an hour and I don't understand what I missed: <script type="text/javascript"> $('#qty_6035').change(function () { var substractedQty, stockQty, remQty; substractedQty = (int) $('#qty_6035').val(); // missing ; before statement stockQty = (int) $('#orig_qty_6035').val(); $('#rem_qty_6035').html(stockQty-substractedQty); }); </script> jQuery library is included at the beggining of the document. Thanks.

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• Programatticaly grabing text from a web page that is dynamically generated.

  - by bstullkid

  There is a website I am trying to pull information from in perl, however the section of the page I need is being generated using javascript so all you see in the source is <div id="results"></div> I need to somehow pull out the contents of that div and save it to a file using perl/proxies/whatever. e.g. the information I want to save would be document.getElementById('results').innerHTML; I am not sure if this is possible or if anyone had any ideas or a way to do this. I was using a lynx source dump for other pages but since I cant straight forward screen scrape this page I came here to ask about it!

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• Can a function defined in a bookmarklet be called from a page-level script?

  - by Soviut

  I have a bookmarklet that needs to open a new window/tab. In order to avoid the popup blocker, I need to call the window.open() method directly in the bookmarklet ie: at the browser-level. However, I want to keep the bookmarklet updatable by loading external Javascript files. To do this, the bookmarklet needs to append script nodes to the DOM. If i were to put window.open() code in one of these externally loaded scripts, the popup blocker would block it since its page-level. What I want to know is if I can create a wrapper function around window.open() in my bookmarklet, then call it from the externally loaded script? What is the scope and what are the permissions on a wrap such as this?

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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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• How to normalize SVG path data (cross browser)?

  - by Timo

  I have tried to find a way to implement cross browser path normalizer. There IS a native way which is described here and functional example is here, but it works only in newest Opera (but not in IE, FF, Safari, Chrome). The native way uses pathElm.normalizedPathSegList and it converts all relative coordinates to absolute ones and represents all path segment types as a following subset of types: M,L,C,z. I have found only one javascript code and jsfiddled functional example of it, but it works only in IE and FF. Chrome gives "Uncaught Error: INDEX_SIZE_ERR: DOM Exception 1". How this could be fixed to work also in Opera, Safari and Chrome or is there any other way for normalizing SVG paths?

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• How to calculate textarea cols with 100% width?

  - by sehwoo

  I set the width of a textarea to 100%, but now I need to know how many characters can fit in one row. I'm trying to write a javascript function to auto-grow/shrink a textarea. I'm trying to keep from using jquery since I just need this one function. My logic is to rows = textarea.value.split('\n'), iterate through rows and count += rows[i].length/textarea.cols, then count += rows.length, and finally textarea.rows = count. The only problem is that count is too large because textarea.cols is too small.

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• How to add style to parent <li> item if child <ul> exists?

  - by user1292760

  I'm trying to make a menu in advance to be seen whether there is a double nesting. <ul class="parent"> <li class="child"></li> <li class="child"> <ul slass="nesting"> <li></li> <li></li> </ul> </li> <li class="child"></li> </ul> So ul class="nesting" hidden by default but appears during the hover of li class="child". I want to make another design on the li class="child" which have a nested ul. Another words how can i show nesting before hover by the means of Javascript/JQuery? Thnaks in advance!

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• What is the easiest method to get the selection in input text field ?

  - by Misha Moroshko

  How could I get the selected text in the following code ? I working with Firefox 3.6.3 (currently not interested in other browsers). HTML: <input id="my_text_field" type="text" /> <div id="log"></div> JavaScript: $("#my_text_field").select(function() { var selected_text = "Something selected"; // What should be here ? $("#log").append(selected_text + "<br />"); });

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• asp.net textbox with java script problem

  - by Eyla

  I'm trying to check if asp.net textbox is empty or not using java script. my code working ok but if I enter only numbers will conder it empty so I have either enter letters and numbers or only letters. Please advice. here is my code <script type="text/javascript"> function check(){ var txt = document.getElementById('<%=txt.ClientID%>').value; //(isNaN(cmbStateHome) == false if (isNaN(txt) == false) { alert("Please enter some thing."); } else {alert("ok");} } } </script> <asp:TextBox ID="txt" runat="server"></asp:TextBox> <asp:TextBox ID="txtZipCodeHome" runat="server" Style="top: 361px; left: 88px; position: absolute; <asp:LinkButton ID="LinkButton1" runat="server" OnClientClick="check()">LinkButton</asp:LinkButton>

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