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  • Javascript setInterval and `this` solution

    - by Michael
    I need to access this from my setInterval handler prefs: null, startup : function() { // init prefs ... this.retrieve_rate(); this.intervalID = setInterval(this.retrieve_rate, this.INTERVAL); }, retrieve_rate : function() { var ajax = null; ajax = new XMLHttpRequest(); ajax.open('GET', 'http://xyz.com', true); ajax.onload = function() { // access prefs here } } How can I access this.prefs in ajax.onload ?

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  • Javascript : random number between variables issue

    - by Mayhem
    I've seen the other examples on this site but I just can't get it to work. I'm trying to generate a random number between 2 user input variables on a form. The numbers will always be positive numbers. min = document.getElementById('min').value; max = document.getElementById('max').value; waitTimer = Math.floor(Math.random() * (max - min + 1)) + min; When min = 5 / max = 10, waitTimer is sometimes returning results like 2, 4 and 28 and so on. What am I doing wrong?

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  • populate array fron list onclick javascript

    - by user3703591
    I 'm writing a code with JS and I don't know how to populate array when clicking on button. We have this code, which uses a list (ul), where the items (li) can be moved with mouse. How can do onclick to populate an array with 2 data, its first position and the last position? <!doctype html> <html lang="en"> <head> <script src="http://code.jquery.com/jquery-1.9.1.js"></script> <script src="http://code.jquery.com/ui/1.10.3/jquery-ui.js"></script> <script src="https://raw.github.com/furf/jquery-ui-touch-punch/master/jquery.ui.touch-punch.min.js"></script> <script> $(function() { $( ".documents" ).sortable(); $( ".documents" ).disableSelection(); }); </script> <meta charset="utf-8"> <title>toArray demo</title> <style> span { color: red; } </style> </head> <body> Reversed - <span></span> <ul id="opciones" class="documents"> <li>uno</li> <li>dos</li> <li>tres</li> </ul> <script> function disp( li ) { var a = []; for ( var i = 0; i < li.length; i++ ) { a.push( li[ i ].innerHTML ); } $( "span" ).text( a.join( " " ) ); } disp( $( "li" ).toArray() ); </script> <input type="button" value="actualizar_array" onclick="disp('#opciones')" /> </body> </html>

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  • Trying to simplify some Javascript with closures

    - by mvalente
    Hi, I'm trying to simplify some JS code that uses closures but I am getting nowhere (probably because I'm not grokking closures) I have some code that looks like this: var server = http.createServer(function (request, response) { var httpmethods = { "GET": function() { alert('GET') }, "PUT": function() { alert('PUT') } }; }); And I'm trying to simplify it in this way: var server = http.createServer(function (request, response) { var httpmethods = { "GET": function() { alertGET() }, "PUT": function() { alertPUT() } }; }); function alertGET() { alert('GET'); } function alertPUT() { alert('PUT'); } Unfortunately that doesnt seem to work... Thus: - what am I doing wrong? - is it possible to do this? - how? TIA -- MV

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  • accessing id property via javascript

    - by webzide
    Dear experts Is there a way to access the ID of an dom element? I don't mean using the getElementById attribute to find out a array of objects. Bascially I already know the DOM element and that object reference is at hand. All I need is to access the ID property. I know something like if(element.id==value) won't work. Thanks in advance.

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  • javascript getElementByName doesn't work

    - by phil
    This simple js script can't set the value of "para". I guess getElementByName doesn't work. But why? <script function fn() { document.getElementById("para").setAttribute("name","hi"); document.getElementByName("hi").setAttribute("value","my value is high"); } </script <html <input type="button" onClick="fn()" value="click me" <input id="para" type="text" / </html

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  • Passing an arbritrary JavaScript object in Xul

    - by Tom Brito
    I'm following this example to pass an object to a window, but when it as an argument it's with "undefined" value. This is my first window (obs. dump is the way to print to console when debug options are turned on): <?xml version="1.0"?> <?xml-stylesheet href="chrome://global/skin/" type="text/css"?> <!DOCTYPE window SYSTEM "chrome://XulWindowArgTest/locale/XulWindowArgTest.dtd"> <window id="windowID" width="400" height="300" xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"> <script> <![CDATA[ function onClickMe(event) { dump("begin\n"); try { var args = { param1: true, param2: 42 }; args.wrappedJSObject = args; var watcher = Components.classes["@mozilla.org/embedcomp/window-watcher;1"].getService(Components.interfaces.nsIWindowWatcher); watcher.openWindow(null, "chrome://XulWindowArgTest/content/about.xul", "windowName", "chrome", args); } catch (e) { dump("error: " + e + "\n"); } dump("end\n"); } ]]> </script> <button label="Click me !" oncommand="onClickMe();" /> </window> and my second window: <?xml version="1.0"?> <?xml-stylesheet href="chrome://global/skin/" type="text/css"?> <!DOCTYPE window SYSTEM "chrome://XulWindowArgTest/locale/XulWindowArgTest.dtd"> <window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul" onload="onload()"> <script> <![CDATA[ function onload() { dump('arg = ' + window.arguments[0].wrappedJSObject + "\n"); } ]]> </script> <label value="test" /> </window> when the second window loads, it calls the onload and prints: arg = undefined Any idea how to fix it?

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  • [Javascript] Prevent an element from being the target in a document mouseover

    - by Sander
    I'm building an firebug-like inspection tool for my page. When the mouse enters an element, the element should be highlighted. Now I'm creating an element which I position absolute on top of the target element, this however means the next mousemove event (which is bound to the document) will fire with the actual "highlight element" as the target. Is there a way to prevent the "highlight element" from being the target element in the mousemove event? The element already has a transparant background.

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  • Javascript indexOf() always returns -1

    - by Thomas
    I try to retrieve the index of en element in an array. This works perfectly var onCreate = function (event) { console.assert(markers[markerId] === undefined); var markerId = event.markerId; markers[markerId] = {}; var marker = markers[markerId]; // create the container object marker.object3d = new THREE.Object3D(); marker.object3d.matrixAutoUpdate = false; scene.add(marker.object3d); //UPDATE ARRAY HOLDING CURRENT MARKERS console.log("ON CREATE"); console.log("current detected markers: " + currentMarkers); var idx = currentMarkers.indexOf(markerId); // Find the index console.log("marker " + event.markerId + " has index: " + idx); if(idx==-1) // if does not exist currentMarkers.push(markerId); But this doesnt... var onDelete = function (event) { console.assert(markers[event.markerId] !== undefined); var markerId = event.markerId; //UPDATE ARRAY HOLDING CURRENT MARKERS console.log("ON DELETE"); console.log("current detected markers: " + currentMarkers); var idxx = currentMarkers.indexOf(markerId); // Find the index console.log("marker " + markerId + " has index: " + idxx); if(idxx != -1) {// if DOES exist currentMarkers.splice(idxx, 1); //Delete var idxxx = currentMarkersCoverChecked.indexOf(markerId); // Find the index if(idxxx == -1) // if does NOT exist, so if not being checked checkMarkerCovered(markerId); } onDeleteRandom(markerId); var marker = markers[markerId]; scene.remove(marker.object3d); delete markers[markerId]; Look at my console output: ON CREATE current detected markers: 2,1,4 marker 3 has index: -1 ON CREATE main.js:266 current detected markers: 2,1,4,3 marker 4 has index: 2 ON DELETE current detected markers: 2,1,4,3 marker 2 has index: -1 ON CREATE current detected markers: 2,1,4,3 marker 2 has index: 0 ON DELETE current detected markers: 2,1,4,3 marker 1 has index: -1

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  • Why doesn't this work? jquery javascript

    - by mars
    $(document).ready(function() { musicList = new array() counter = 0; if($(".rA, .trA, .dA, .hA").length > 0) { /*$(".rA, .trA, .dA, .hA").each(function(e){*/ $(".hA").each(function(e){ $.post("/index/audio/ajax.track", { id: $(this).attr("rel") }, function(data){ /*THIS DOESN'NT WORK */ musicList.push(data.file); /*THIS DOESN'NT WORK */ alert(data.file);/*this words*/ }, "json"); counter++; }); if(counter>0) { alert(counter); } } }); I don't see anything wrong with the code but I have no idea why it won't work I just spent 3 hours trying to get it to work

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  • Collision Handling in Javascript - Particles Get Stuck

    - by Conner Ruhl
    I am trying to recreate this, and I have been fairly successful. I am having issues with the collision handling though. Although the collision handling seems to work, it has very strange behavior. Here is what I have so far. This is the code that handles collisions: var dx = particle2.getX() - particle1.getX(); var dy = particle2.getY() - particle1.getY(); var angle = Math.atan2(dy, dx); var newP2X = particle1.getX() + (particle1.getRadius() + particle2.getRadius()) * Math.cos(angle); var newP2Y = particle1.getY() + (particle1.getRadius() + particle2.getRadius()) * Math.sin(angle); particle2.setX(newP2X); particle2.setY(newP2Y); var p1Vxi = particle1.getVx(); var p1Vyi = particle1.getVy(); var p1Mass = particle1.getMass(); var p2Vxi = particle2.getVx(); var p2Vyi = particle2.getVy(); var p2Mass = particle2.getMass(); var vxf = (p1Mass * p1Vxi + p2Mass * p2Vxi) / (p1Mass + p2Mass); var vyf = (p1Mass * p1Vyi + p2Mass * p2Vyi) / (p1Mass + p2Mass); particle1.setVx(vxf); particle1.setVy(vyf); particle2.setVx(vxf); particle2.setVy(vyf); EDIT: I have tried to change it to inelastic collisions like suggested, but for some reason the balls collide erratically. Check it out here. Any help is much appreciated!

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  • Javascript: How to detect if a word is highlighted

    - by fterh
    I'm writing a Firefox addon that is triggered whenever a word is highlighted. However I need a script that detects when a word is highlighted, and I'm stuck. An example would be nytimes.com (when you're reading an article and you highlight a word, the reference icon pops up). However the nytimes.com script is super complex. I'm 16 and not much of a programmer, so that is definitely way out of my league.

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  • Javascript help needed - which variable is return empty??

    - by mathew
    Hi I would like to know how do I add an error check to below mentioned code...I mean how do I check if this code return empty or not?? if this returns empty then I would give a message "Not Found".. How do I do That?? google.load('search', '1'); var blogSearch; function searchComplete() { // Check that we got results document.getElementById('content').innerHTML = ''; if (blogSearch.results && blogSearch.results.length > 0) { for (var i = 0; i < blogSearch.results.length; i++) { // Create HTML elements for search results var p = document.createElement('p'); var a = document.createElement('a'); a.href = blogSearch.results[i].postUrl; a.innerHTML = blogSearch.results[i].title; // Append search results to the HTML nodes p.appendChild(a); document.body.appendChild(p); } } } function onLoad() { // Create a BlogSearch instance. blogSearch = new google.search.BlogSearch(); // Set searchComplete as the callback function when a search is complete. The // blogSearch object will have results in it. blogSearch.setSearchCompleteCallback(this, searchComplete, null); // Set a site restriction blogSearch.setSiteRestriction('blogspot.com'); // Execute search query blogSearch.execute('1974 Chevrolet Caprice'); // Include the required Google branding google.search.Search.getBranding('branding'); } // Set a callback to call your code when the page loads google.setOnLoadCallback(onLoad);

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  • getJSON and variable scope in javascript

    - by nillls
    Hi! In order to make function calls to our back-end php code we've implemented something called an ActionProxy like this: function ActionProxy(action, input, callback){ $.post("ActionProxy.php?method="+action, { data: input}, function(data, textStatus, XMLHttpRequest){ //return data.ResponseWhatever } }); The problem we're having is that using data outside the ActionProxy is impossible due to variable scope limitations (we assume), setting var res = data.ResponseWhatever or return data.ResponseWhatever is pretty futile. How would one handle these responses most appropriately so that functions calling the actionproxy can access the response values?

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  • Listing known CSS classes using Javascript

    - by Fred Oliveira
    I'm trying to find a good way to collect the names of classes defined in the stylesheets included with a given document. I know about document.StyleSheetList but it doesn't seem like it'd be easy to parse. What I'm looking for is something like, for a stylesheet document such as: .my_class { background: #fff000; } .second_class { color: #000000; } I could extract an array like ["my_class", "second_class"]. This obviously assumes the favorable scenario of a fully loaded dom and stylesheets. I've been looking everywhere for a good way to do something like this and so far, have made little progress. Does anyone have any idea about how to pull this off? Thanks!

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  • Reading bytes from JavaScript string

    - by Jan
    I have a string containing binary data in JS. Now I want to read, for example, an integer from it. So I get the first 4 characters, use charCodeAt, do some shifting etc. to get an integer. Problem is that strings in JS are UTF-16 (instead of ASCII) and charCodeAt often returns values higher than 256. The Mozilla reference states that "The first 128 Unicode code points are a direct match of the ASCII character encoding." (what about ASCII values 128?) How can I convert the result of charCodeAt to an ASCII value? Or is there a better way to convert a string of four characters to a 4 byte integer?

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  • Javascript text Resize

    - by blackessej
    Without getting into the "should a text resizer be used or not" debate, I'd like some help with this...suffice to say that my clientele are from and older generation and may be sight impaired... My script isn't functioning, and I'm not sure why. It's not live yet, so here's what I'm working with: function fsize(size,unit,id){ var vfontsize = document.getElementById("#colleft"); if(vfontsize){ vfontsize.style.fontSize = size + unit; } } var textsize = 14; function changetextsize(up){ if(up){ textsize = parseFloat(textsize)+2; }else{ textsize = parseFloat(textsize)-2; } } I'm using onclick events to trigger the size changes. Thanks for your help!

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  • Javascript XMLHttpRequests in Loop?

    - by usurper
    Hi, I am trying to save an array of records into a mysql database but I always get the abort message in firebug except for the last save. How do I save the records using a loop for XMLHttpRequest? Here is my code: function savingContent() { if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari xmlhttp=new XMLHttpRequest(); } else {// code for IE6, IE5 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); } var rowindex = 0; for (x in globalObj.AddedRows) { var rowData = "?q=" + globalObj.AddedRows[rowindex]; xmlhttp.open("POST", "insertRowData.php"+rowData, true); xmlhttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded"); xmlhttp.setRequestHeader("Content-Length",rowData.length); xmlhttp.send(null); rowindex += 1; }

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  • Split a sting array into a number array in javascript

    - by Wesley Skeen
    I am reading a value from a dropdown list depending on what option is selected. I am using jqPlot to graph the values. jqPlot expects an array of values like [91, 6, 2, 57, 29, 40, 95] but when I read the value in from the dropdown box it is coming in as a whole string "[91, 6, 2, 57, 29, 40, 95]" I tried splitting it but I got ["91", "6", "2", "57", "29", "40", "95"] which wont display the graph correctly. Is there anybody that has encountered something like this before and what can I do to make my values convert into a number array. Thanks for any help

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  • Javascript access TR from TD

    - by arik-so
    Hello. I have a table row, and within that, I have a td (whatever it stands for). I want, without an ID or a name, to be change the class attribute of the TR my TD is in. Like that: <tr> <td onclick="[TR].setAttribute('class', 'newName')">My TD</td> </tr> How do I do it?

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  • Javascript access object variables from functions

    - by Parhs
    function init_exam_chooser(id,mode) { this.id=id; this.table=$("#" + this.id); this.htmlRowOrder="<tr>" + $("#" + this.id + " tbody tr:eq(0)").html() + "</tr>"; this.htmlRowNew="<tr>" + $("#" + this.id + " tbody tr:eq(1)").html() + "</tr>"; $("#" + this.id + " tbody tr").remove(); //Arxikopoiisi var rowNew=$(this.htmlRowNew); rowNew.find("input[type='text']").eq(0).autocomplete({ source: function (req,resp) { $.ajax({ url: "/medilab/prototypes/exams/searchQuick", cache: false, dataType: "json", data:{codeName:req.term}, success: function(data) { resp(data); } }); }, focus: function(event,ui) { return false; }, minLength :2 }); rowNew.find("input[type='text']").eq(1).autocomplete({ source: function (req,resp) { $.ajax({ url: "/medilab/prototypes/exams/searchQuick", cache: false, dataType: "json", data:{name:req.term}, success: function(data) { resp(data); } }); }, focus: function(event,ui) { return false; }, minLength :2 }); rowNew.find("input[type='text']").bind( "autocompleteselect", function(event, ui) { alert(htmlRowOrder); var row=$(htmlRowOrder); $(table).find("tbody tr:last").before(row); alert(ui.item.id); }); rowNew.appendTo($(this.table).find("tbody")); //this.htmlRowNew } The problem is at ,how i can access htmlRowOrder? I tried this.htmlRowOrder and didnt work.... Any ideas?? rowNew.find("input[type='text']").bind( "autocompleteselect", function(event, ui) { alert(htmlRowOrder); var row=$(htmlRowOrder); $(table).find("tbody tr:last").before(row); alert(ui.item.id); });

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  • Javascript: Properly Setting A Text Area

    - by Jeremy Person
    I have a text area and the problem is people are typing a large amount of text and I have it clearing out the value and forcing an N/A so I can force something to be entered. How can I make the script below validate someone has already typed something (and not clear it out) but still clear out the N/A by default? textarea name="req_WhatMadeItDifficultToUse" cols="35" onfocus="this.value = '';" onblur="if(this.value == '') this.value = 'N/A';" id="WhatMadeItDifficultToUse"N/A

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