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  • Javascript array length incorrect on array of objects

    - by Serenti
    Could someone explain this (strange) behavior? Why is the length in the first example 3 and not 2, and most importantly, why is the length in the second example 0? As long as the keys are numerical, length works. When they are not, length is 0. How can I get the correct length from the second example? Thank you. a = []; a["1"] = {"string1":"string","string2":"string"}; a["2"] = {"string1":"string","string2":"string"}; alert(a.length); // returns 3 b = []; b["key1"] = {"string1":"string","string2":"string"}; b["key2"] = {"string1":"string","string2":"string"}; alert(b.length); // returns 0

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  • Calling a webservice in javascript

    - by user303052
    So, I am trying to make a firefox extension which will use a webservice. I was looking online to find a way to do this. I was wondering if someone could explain what the following objects/methods do: service.useService(_, _); service.<`Service Name.callService(); If there is an alternative that does not include these objects, I would be happy to hear about it. Thank you very much

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  • how to set style through javascript in IE immediately

    - by rezna
    Hi, recently I've encountered a problem with IE. I have a function function() { ShowProgress(); DoSomeWork(); HideProgress(); } where ShowProgress and HideProgress just manipulate the 'display' CSS style using jQuery's css() method. In FF everything is OK, and at the same time I change the display property to block, progress-bar appears. But not in IE. In IE the style is applied, once I leave the function. Which means it's never shown, because at the end of the function I simply hide it. (if I remove the HideProgress line, the progress-bar appears right after finishing executing the function (more precisely, immediately when the calling functions ends - and so there's nothing else going on in IE)). Has anybody encountered this behavior? Is there a way to get IE to apply the style immediately? I've prepared a solution but it would take me some time to implement it. My DoSomeWork() method is doing some AJAX calls, and these are right now synchronous. I assume that making them asynchronous will kind of solve the problem, but I have to redesign the code a bit, so finding a solution just for applying the style immediately would much simplier. Thanks rezna

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  • Javascript error in rails app (locally run)

    - by tesmar
    Hi, I am trying to move a development environment from production to my local machine (Ubuntu), and when I get the code up and running on my box, the site works in rails but I get this JS error: Permission denied for http://ad.doubleclick.net to call method Location.toString on http://localhost:3000. Line 0 Do you have any idea how to fix JS problems, or should I disable the ads in development?

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  • How much does Javascript garbage collection affect performance?

    - by Long Ouyang
    I'm writing a bunch of scripts that present images serially (e.g. 1 per second) and require the user to make either a keyboard or mouse response. I'm using closures to handle the timing of image presentation and user input. This causes garbage collection to happen pretty frequently and I'm wondering if that will affect the performance (viz. timing of image presentation).

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  • Catching "NullPointerExceptions" in JavaScript

    - by Lenni
    I'm writing quite a bit of code in Prototype.js which returns null if a DOM-id wasn't found. $("someId").show(); If someId doesn't exist, a method will be called on null, which halts the entire program, in effect disabling all JS effects after the error. I could just check for null before executing such a statement, but this is getting tiring. I would like to catch an exception but I'm not sure which one its is. MDC lists the following ECMA Script error types: * Error * EvalError * RangeError * ReferenceError * SyntaxError * TypeError * URIError * DOMException * EventException * RangeException Also, do browsers have a unified way of dealing with a method call on null?

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  • Javascript: find first n prime numbers

    - by bard
    function primeNumbers() { array = []; for (var i = 2; array.length < 100; i++) { for (var count = 2; count < i; count++) { var divisorFound = false; if (i % count === 0) { divisorFound = true; break; } } if (divisorFound == false) {array.push[i];} } return array; } When I run this code, it seems to get stuck in an infinite loop and doesn't return anything... why?

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  • Variable scope in javascript

    - by Rich Bradshaw
    This is a simple question, but I can't work it out. The specifics aren't important, but here's the gist. I have some code like this: var lat = 0; var lon = 0; if (navigator.geolocation) { navigator.geolocation.getCurrentPosition(function(position) { lat = position.coords.latitude; lon = position.coords.longitude; }); } What I think it's doing is: Set lat and lon to 0 If the browser has geolocation, overwrite those variables with real values However, at the end of that chunk, lat and lon are still 0. I've tried adding vars, passing lat and lon to the function etc but with no success... How do I make this work?

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  • Javascript nested functions not returning

    - by Achintha Samindika
    I'm building a phonehap application. I'm using an web sql and everything works fine till data retival. function getItemGroups(){ var items_groups = new Array(); var db = window.openDatabase("merbokDB", "1.0", "MerbokDB", 5232394); db.transaction( function(tx){ tx.executeSql('SELECT * FROM item_groups',[], function(tx,result){ if(result.rows.length > 0){ var len = result.rows.length; for (var i=0; i<len; i++){ items_groups.push(result.rows.item(i).item_group); } console.log(items_groups.join()); } } ,errorCB); }, errorCB); return items_groups; } var myproducts = getItemGroups(); My problem was when I run the code "myproducts" variable is blank. but the I can see console.log(items_groups.join()); following line printing the values in console. Is I'm wrong in the way I returning?

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  • changing css properties via javascript

    - by tic
    I need a function to change the appearance of some elements in my html page "on the fly", but I am not able to do. The problem is that I cannot use a command like document.write ('body {background-color: #cccccc;}'); because I need to make the changes effective when the page is already loaded, using a link like <a onmouseclick="Clicker(1)" href="#">clic</a> and I cannot use a command like document.body.style.background='#cccccc'; because I do not know if it can be applied to other not so easy cases, because I need to change the appearance of elements such as td.myclass or sibling elements such as th[scope=col]+th[scope=col]+th[scope=col]. How can I do it? Thanks!

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  • jquery / javascript for a user to select 1 of n images

    - by TesterTurnedDeveloper
    I want to display a few images (probably 5 max) and have a user click to select one. First thing I tried was radio buttons and putting the images inside labels. <input type="radio" name="BackgroundId" id="BackgroundId" value="1" /> <label for="BackgroundId"><img src="../../Content/images/thumb_1.jpg" /></label> Firefox will select the radio button when the user clicks the image, but IE doesn't. Is there a jquery plugin that will make the images clickable? Fancy-form looks like something I could use, but it isn't jquery and I've already got jquery in my project. Or can someone point me to a better way of selecting a single image?

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  • Javascript obfuscation help

    - by Victor
    I need some help to understand how this code was obfuscated. The code is: <a id="suggest" href="#" ajaxify="/ajax/social_graph/invite_dialog.php?class=FanManager&amp;node_id=108463912505356" class=" profile_action actionspro_a" rel="dialog-post">Suggest to Friends</a> And the obfuscation is: \x3c\x61\x20\x69\x64\x3d\x22\x73\x75\x67\x67\x65\x73\x74\x22\x20\x68\x72\x65\x66\x3d\x22\x23\x22\x20\x61\x6a\x61\x78\x69\x66\x79\x3d\x22\x2f\x61\x6a\x61\x78\x2f\x73\x6f\x63\x69\x61\x6c\x5f\x67\x72\x61\x70\x68\x2f\x69\x6e\x76\x69\x74\x65\x5f\x64\x69\x61\x6c\x6f\x67\x2e\x70\x68\x70\x3f\x63\x6c\x61\x73\x73\x3d\x46\x61\x6e\x4d\x61\x6e\x61\x67\x65\x72\x26\x61\x6d\x70\x3b\x6e\x6f\x64\x65\x5f\x69\x64\x3d\x31\x30\x38\x34\x36\x33\x39\x31\x32\x35\x30\x35\x33\x35\x36\x22\x20\x63\x6c\x61\x73\x73\x3d\x22\x20\x70\x72\x6f\x66\x69\x6c\x65\x5f\x61\x63\x74\x69\x6f\x6e\x20\x61\x63\x74\x69\x6f\x6e\x73\x70\x72\x6f\x5f\x61\x22\x20\x72\x65\x6c\x3d\x22\x64\x69\x61\x6c\x6f\x67\x2d\x70\x6f\x73\x74\x22\x3e\x53\x75\x67\x67\x65\x73\x74\x20\x74\x6f\x20\x46\x72\x69\x65\x6e\x64\x73\x3c\x2f\x61\x3e","\x73\x75\x67\x67\x65\x73\x74 Now I used unescape on the above obfuscated code to read it. What I want to know is what exactly was used to obfuscate the code like that? Basically, I need to customize the readable code to the same obfuscation. Any help would be greatly appreciated.

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  • What's wrong in my JavaScript code?

    - by DarkLightA
    I can't figure out what's wrong. var CarObj = function(passengers, maxLoad, wheels, doors, maxSpeed) { this.passengers = passengers; this.maxLoad = maxLoad; this.wheels = wheels; this.doors = doors; this.maxSpeed = maxSpeed; }; var ferrari = new CarObj(4, "700kg", 4, 2, "360km/h"); var output = new Array(); for (var i = 0; i < ferrari.length; i++) { for (var a in ferrari) { output[i] = a; } } document.getElementById('ELEMENTHERE').innerHTML = (output.join(" "));

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  • Javascript date comparison

    - by Art
    Why does equality operator return false in the first case? var a = new Date(2010, 10, 10); var b = new Date(2010, 10, 10); alert(a == b); // <- returns false alert(a.getTime() == b.getTime()); // returns true Why?

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  • using javascript replace() to match the last occurance of a string

    - by Dave
    I'm building an 'add new row' function for product variations, and I'm struggling with the regex required to match the form attribute keys. So, I'm basically cloning rows, then incrementing the keys, like this (coffeescript): newrow = oldrow.find('select, input, textarea').each -> this.name = this.name.replace(/\[(\d+)\]/, (str, p1) -> "[" + (parseInt(p1, 10) + 1) + "]" ) this.id = this.id.replace(/\_(\d+)\_/, (str, p1) -> "_" + (parseInt(p1, 10) + 1) + "_" ) .end() This correctly increments a field with a name of product[variations][1][name], turning it into product[variations][2][name] BUT Each variation can have multiple options (eg, color can be red, blue, green), so I need to be able turn this product[variations][1][options][2][name] into product[variations][1][options][3][name], leaving the variation key alone. What regex do I need to match only the last occurrence of a key (the options key)?

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  • Clever "add tag" javascript help needed

    - by Camran
    I have this function for adding options to a Select list: function addOption(selectbox, value, text, cl ) { var optn = document.createElement("OPTION"); optn.text = text; optn.value = value; if (cl==1){ optn.className = "nav_option_main"; } selectbox.options.add(optn); } I have just discovered the "optgroup" tag, but I don't know how to implement it to the drop list. The function above is called on another selectboxes "OnChange" event, to fill sub-select-box with the desired options. I don't think it should be too difficult to add the "optgroup" tag into this, or is it? Thanks and if you need more input let me know...

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  • Can't find the error in my javascript code

    - by Olivier
    This js program should display the first 100 prime numbers, but instead it crashes each and every time and I can't find the error! Could someone point me towards the best way to debug js code?! Thank you! // initialisation of the array p holding the first 100 prime numbers var p = []; // set the first prime number to 2 p.push(2); // find the first 100 prime numbers and place them in the array p var i = 3; while (p.length < 100) { var prime = true; loop: for (var item in p){ if (i%item === 0){ prime = false; break loop; } } if (prime) p.push(i); i = i + 2; } // display the first 100 prime numbers found var i=1; for (var item in p){ document.writeln(i,item); i++; }

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  • Javascript - event listener toggle button

    - by user2546157
    I'm trying to create a button which can toggle "double click" to "single click" and in the opposite. For some reason, once it toggles to single click and it cannot toggle back. Can anyone please help! function init() { normal_listeners(); } function addListener(){ var image1 = document.getElementById('image_1'); var image2 = document.getElementById('image_2'); var image3 = document.getElementById('image_3'); if(document.getElementById('listener_1').value == "Listener"){ document.getElementById('listener_1').style.backgroundColor = "red"; alert("Normal"); image1.addEventListener("dblclick", function(){userChoice(1);}, false); image2.addEventListener("dblclick", function(){userChoice(2);}, false); image3.addEventListener("dblclick", function(){userChoice(3);}, false); document.getElementById('listener_1').value = "Normal"; } else if(document.getElementById('listener_1').value == "Normal") { document.getElementById('listener_1').style.backgroundColor = "green"; alert("Listener"); image1.addEventListener("click", function(){userChoice(1);}, false); image2.addEventListener("click", function(){userChoice(2);}, false); image3.addEventListener("click", function(){userChoice(3);}, false); document.getElementById('listener_1').value = "Listener"; } } function normal_listeners(){ var image1 = document.getElementById('image_1'); var image2 = document.getElementById('image_2'); var image3 = document.getElementById('image_3'); var listener1 = document.getElementById('listener_1'); listener1.addEventListener("click", addListener, false); image1.addEventListener("dblclick", function(){userChoice(1);}, false); image2.addEventListener("dblclick", function(){userChoice(2);}, false); image3.addEventListener("dblclick", function(){userChoice(3);}, false); } window.onload = init; <img id="image_1" src="rock.jpg" alt="ROCK" width="100" height="100"> <img id="image_2" src="paper.jpg" alt="PAPER" width="100" height="100"> <img id="image_3" src="scissors.jpg" alt="SCISSORS" width="100" height="100"> <input type="button" id="listener_1" value="Normal" style="background-color:red">

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  • How to remove an element from opener window viewsource using javascript

    - by spj
    Hi Step 1 I've two screens one is parent and the other one is child. On click of a button in the parent window the child popup will open. Step 2 On click of a button in child i'm displaying the html(viewsource) of parent window in a textbox(.net) and holding in a hidden variable hdnSource too. Step 3 I've 4 checkboxes in the child window. If the checkbox is not checked, then that part of html should be removed. eg: cbxPersonal, cbxProfessional if cbxProfessional is unchecked I should remove divProfessional from html which is in hdnSource and display in the textbox Can anyone help me to do the 3rd part of coding. Since the html is in the variable, I'm not able to find the div with document.getElementById

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