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  • Got a question I don't understand, can anyone make sense of it?

    - by user275074
    Question on a on-line resource paper: Create javascript so that the following methods produce the output listed next it. circle = new Circle(); console.log(circle.get_area()); // 3.141592653589793 circle.set_radius(10); console.log(circle.get_area()); // 314.1592653589793 console.log(circle); // the radius of my circle is 10 and it's area is 314.1592653589793 Can anyone understand what is being asked?

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  • Selecting all elements

    - by Eelke
    This should be really simple but I'm a javascript/jQuery rookie, so here we go: With the following code I can select a certain element var user = $(".ui-selected .user-name").html(); But if there are multiple elements with the above classes, only the first value gets selected. What I would like to accomplish is a variable with all the elements seperated by a , like: user1,user2,user3 ... etc. Any help would be greatly appreciated, thanks in advance!

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  • client generated double submit cookie, cross site request forgery prevention

    - by james
    in a double-submitted cookie csrf prevention scheme, is it necessary for the server to provide the cookie? it seems i could have javascript on the clients page generate and set a cookie "anti_csrf", then double submit that (once as a cookie, done by the browser, and once in the body of the request). a foreign domain would not be able to read or write the "anti_csrf" cookie to include it in the body of a request. is this secure, or am i overlooking something?

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  • I want to learn a new language!

    - by Alex
    Hi, I'm a college student majoring in computer science. I know java and will be learning C++ the next couple years at school. I want to add another language to my repertoire and have gotten conflicting advice: Ruby, Python, Perl, JavaScript, PHP, AJAX, among others. I was wondering what everyone's opinions were on the relative value of each of these languages in the job market, the ease of learning of each of the languages, and just personal preferences when it comes to the languages mentioned above. Thanks!

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  • New Comer to JS Looking for Guidance

    - by New Coder
    I'm fairly new to JavaScript. Can anyone share some good advice on getting started? I have a little experience in ActionScript 3 and have taken a few Java classes toward my CS degree but my background is of a designer transitioning into development. My goal is to become a well rounded front-end developer and I'd like to move beyond the simple slideshow animations and rollover effects. Any guidance/wisdom will be much appreciated!

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  • Bug in Safari: options.length = 0; not working as expected in Safari 4

    - by Stefan
    This is not a real question, but rather an answer to save some others the hassle of tracking this nasty bug down. I wasted hours finding this out. When using options.length = 0; to reset all options of a select element in safari, you can get mixed results depending on wether you have the Web Inspector open or not. If the web inspector is open you use myElement.options.length = 0; and after that query the options.length(), you might get back 1 instead of 0 (expected) but only if the Web Inspector is open (which is often the case when debugging problem like this). Workaround: Close the Web Inspector or call myElement.options.length = 0; twice like so: myElement.options.length = 0; myElement.options.length = 0; Testcase: <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <head> <title>Testcase</title> <script type="text/javascript" language="javascript" charset="utf-8"> function test(el){ var el = document.getElementById("sel"); alert("Before calling options.length=" + el.options.length); el.options.length = 0; alert("After calling options.length=" + el.options.length); } </script> </head> <body onLoad="test();"> <p> Make note of the numbers displayed in the Alert Dialog, then open Web inspector, reload this page and compare the numbers. </p> <select id="sel" multiple> <option label="a----------" value="a"></option> <option label="b----------" value="b"></option> <option label="c----------" value="c"></option> </select> </body> </html>

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  • C#: Label contains no text

    - by Vinzcent
    Hey I would like to get the text out of a label. But the label text is set with Javascript. On the page I can see that there is text in the label, but when I debug it shows this: "". So how do I get the text out of a label that is set with Javascript, at least that is what I think is the problem. My code: <asp:TextBox ID="txtCount" runat="server" Width="50px" Font-Names="Georgia, Arial, sans-Serif" ForeColor="#444444"></asp:TextBox> <ajaxToolkit:NumericUpDownExtender ID="NumericUpDownExtender1" runat="server" Minimum="1" TargetButtonDownID="btnDown" TargetButtonUpID="btnUp" TargetControlID="txtCount" Width="20" /> <asp:ImageButton ID="btnUp" runat="server" AlternateText="up" ImageUrl="Images/arrowUp.png" OnClientClick="setAmountUp()" ImageAlign="Top" CausesValidation="False" /> <asp:ImageButton ID="btnDown" runat="server" AlternateText="down" ImageUrl="Images/arrowDown.png" OnClientClick="setAmountDown()" ImageAlign="Bottom" CausesValidation="False" /> <asp:Label ID="lblKorting" runat="server" /> <asp:Label ID="lblAmount" runat="server" /> <asp:Button ID="btnBestel" runat="server" CssClass="btn" Text="Bestel" OnClick="btnBestel_Click1" /> JS function setAmountUp() { var aantal = document.getElementById('<%=txtCount.ClientID%>').value-0; aantal+=1; calculateAmount(aantal); } function setAmountDown() { var aantal = document.getElementById('<%=txtCount.ClientID%>').value-0; if(aantal > 1) aantal -=1; calculateAmount(aantal); } function calculateAmount(aantal) { var prijs = document.getElementById('<%=lblPriceBestel.ClientID%>').innerHTML -0; var totaal = 0; if(aantal < 2) { totaal = prijs * aantal; document.getElementById('<%=lblKorting.ClientID%>').innerHTML = ""; } else if(aantal >= 2 && aantal < 5) { totaal = (prijs * aantal)*0.95; document.getElementById('<%=lblKorting.ClientID%>').innerHTML = "-5%"; } else if(aantal >= 5) { totaal = (prijs * aantal)*0.90; document.getElementById('<%=lblKorting.ClientID%>').innerHTML = "-10%"; } document.getElementById('<%=lblAmount.ClientID%>').innerHTML = totaal; } C# private OrderBO bestelling; protected void btnBestel_Click1(object sender, EventArgs e) { bestelling = new OrderBO(); bestelling.Amount = Convert.ToInt32(lblAmount.Text); //<--- THIS IS "" in the debugger, but on the page 10 }

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  • android 2.2 browser dont work pageY or PageX in ontouchend event

    - by juanca
    I have a web app that work perfect in android 2.1, when I upgrade to 2.2 the pageX property in ontouchend event, this is my code: menu1.ontouchend = function(e){ e.preventDefault(); if (e.touches && e.touches.length0) { // iPhone x2 = e.touches[0].pageX; y2 = e.touches[0].pageY; } else { // all others x2 = e.pageX; y2 = e.pageY; } } Anybody know what change in the javascript API for touch events from 2.1 to 2.2?????

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  • Convert GMT time to local time

    - by Dibish
    Am getting a GMT time from my server in this format Fri, 18 Oct 2013 11:38:23 GMT My requirement is to convert this time to local time using Javascript, eg:/ if the user is from India, first i need to take the time zone +5.30 and add that to my servertime and convert the time string to the following format 2013-10-18 16:37:06 I tried with following code but not working var date = new Date('Fri, 18 Oct 2013 11:38:23 GMT'); date.toString(); Please help me to solve this issue, Thanks in advance

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  • How to resize html canvas element?

    - by russx2
    I have a canvas element defined statically in the html with a width and height. If I attempt to use JavaScript to resize it dynamically (setting a new width and height - either on the attributes of the canvas or via the style properties) I get the following error in Firefox: uncaught exception: [Exception... "Illegal operation on WrappedNative prototype object" nsresult: "0x8057000c (NS_ERROR_XPC_BAD_OP_ON_WN_PROTO)" location: "JS frame :: file:///home/russh/Desktop/test.html :: onclick :: line 1" data: no] Is it possible to resize this element or do I have to destroy it and create a new element on the fly?

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  • Writing String into a File

    - by Halo
    I'm implementing a WebScript using Alfresco's JavaScript. l'm trying to insert string to a file, but I can't do it. When I write another file's content like: file.properties.content.write(content); It works, and the file's contents are copied into my file. But I can't insert string directly, like: file.properties.content.write("Stuff like that"); it gives an exception. How can I write string into this file?

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  • Math.min.apply(0, x) - why?

    - by Trevor Burnham
    I was just digging through some JavaScript code (Raphaël.js) and came across the following line (translated slightly): Math.min.apply(0, x) where x is an array. Why on earth would you do this? The behavior seems to be "take the min from the array x."

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  • Track only iframe history

    - by evanwong
    I have a page which contains an iframe and I want to track the history of the iframe only. I tried to use the history object like this: <!DOCTYPE html> <html> <head> <title></title> <script type="text/javascript"> function checkFrameHistory() { alert(window.frames["test2"].history.length); } function checkThisHistory() { alert(history.length); } </script> </head> <body> <iframe name="test2" src="test2.html"></iframe> <div> <input type="button" onclick="checkFrameHistory()" value="Frame history"/> <input type="button" onclick="checkThisHistory()" value="This history"/> </div> </body> </html> test2.html <!DOCTYPE html> <html> <head> <title></title> <script type="text/javascript"> function checkMyHistory() { alert(history.length); } </script> </head> <body> <div> Test2 </div> <div> <input type="button" onclick="checkMyHistory()" value="My history"/> </div> </body> </html> but it actually gave me the history including the parent window. For instance, I went to another site in the main window and came back to my iframe test site. Both window.frames["test2"].history.length and history.length still gave me the same count by increasing the length by 2. Did I do it wrong? Is there a way to track only the iframe history?

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  • Returning the Name of a column header

    - by Jason Kelly
    I need your help, Given the html table below, how can I create a javascript function that will, at the click of a mouse, alert me the name of the column header? Ie. if I click on the COLORS header, a javascript box will popup and alert("COLORS")? <html> <head> </head> <body> <table border="1" cellspacing="1" width="500"> <tr> <td>FRUITS</td> <td>COLORS</td> <td>VEGGIES</td> <td>NUMBERS</td> </tr> <tr> <td>apples</td> <td>red</td> <td>carrots</td> <td>123</td> </tr> <tr> <td>oranges</td> <td>blue</td> <td>celery</td> <td>456</td> </tr> <tr> <td>pears</td> <td>green</td> <td>brocoli</td> <td>789</td> </tr> <tr> <td>mangos</td> <td>yellow</td> <td>lettuce</td> <td>098</td> </tr> </table> </body> </html>

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  • Adding data dynamically to a html page

    - by Hulk
    In a htmlpage using jquery or javascript how can the following be achieved? User types in a question in a textarea and press on enter button ,then the same question should be displayed dynamically in the page below the textarea and the user can enter as many questions. And when the user is done the page is submitted through a submit button Can u please give a small hint of how this can be done.. Thanks..

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  • Making AJAX calls secure

    - by iamdadude
    What happens if a user looks at my JavaScript file, copies the content of a function and sends a request to my server using AJAX? And is there a way to properly protect against this from happening?

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  • Why is this widely used script killing my processor

    - by zac
    I installed this popular, light-weight script on a website but it is running very poorly and maxing out my processor. http://www.leigeber.com/2008/12/javascript-slideshow/ This is for sure my problem and nothing wrong with that script which runs fine for me on the demo site, but I have no errors and do not understand where the conflict lies. Any ideas on how to root this out?

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