This snippet results in a JavaScript runtime error: (foo is not defined)
if (foo) {
// ...
}
I have to define foo first, like so:
var foo = foo || null ...
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I have a problem where a method is getting an undefined variable error, even though I check for the variable being undefined before calling.
// Sets focus and text-select to the passed ...
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I have a global variable in Javascript (actually a window property, but I don't think it matters) which was already populated by a previous script but I don't want another script ... |
I'm a bit confused about Javascript undefined & null.
Firstly what does if (!testvar) actually do? Does it test for undefined and null or just undefined?
Secondly, once a variable is defined can ... |
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<HEAD>
<script type="text/javascript" src="lb-core.js"></script>
<script type="application/javascript">
var lbp = {
defaults: {
color: "blue"
...
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Possible Duplicate:
Detecting an undefined object property in JavaScript
Would it be like this?
if(variable == undefined) {
or would it be like this?
if(variable == "undefined") {
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It's 20:30 and I'm after a 6 hour bug hunt of an irritating bug caused by an uninitialized member variable.
In the our previous version we had the next few lines of ... |
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Possible Duplicate:
How can I check whether a variable is defined in JavaScript?
Say we have a piece of code like this. How would one be ... |
So here is the problem. There is a HTML/JS code, but I can't read v3 variable. In short anything after DDDD(D,{"COM":"lng","leaf":145,"AXIS":true}); (which is some kind of predefined random array) is unreadable(or ... |
I'm using isFinite to determine if a key from an array is correct,
for (x in selectList) {
if (isFinite(x)) {
...
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I know that I can test for a javascript variable and then define it if it is undefined, but is there not some way of saying
var setVariable = localStorage.getItem('value') || 0;
seems ... |
I'm trying to parse an RSS feed using javascript. Sometimes a feed has multiple categories so I want to check if there is anything at item 2. If I ... |
<div id="myDiv"></div>
alert(myDiv); // alerts '[html HTMLDivElement]'
I don't understand how this seems to work. I thought you must specify the div element's id with getElementById();
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I have some code I copied from an example and I am not certain I understand it, and it is giving me an error that didn't happen when I first used ... |
I was warned that this post could be too subjective, but I've only been programming for a few weeks, so I'd like to know.
So far I've been using try/catch statements in ... |
http://pastebin.com/YysAqpQ5
I have this script and It's getting an aC variable undefined when it calls the aC.checkStreamUpdates function on line 447. In reference to the aC.newestUpdate variable I believe. I've ... |
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im trying to open a lightbox when webpages loads using the javascript library "lytebox"
here is my code
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; ...
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what is the best usage for the "typeof" JavaScript function?
if (typeof (myvar) == 'undefined') {
//or
if (typeof (myvar) == undefined) {
//or
if (typeof myvar == 'undefined') {
//or
if (typeof myvar == ...
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I'm trying to extend the JavaScript on a page I maintain to apply some formatting as the calendar section of the page is loaded. There's a prexisting function called InitCalendar(month) that ... |
I just test the "typeof" in javascript, and really don't know why the result is like this.
/****/
var cota,
plouto;
alert(typeof plouto/cota); //NaN
/ ****/
var cota,
...
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Here is a JavaScript example from Eloquent JavaScript:
function findSequence(goal) {
function find(start, history) {
if (start == goal)
return history;
...
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I'm new to Javascript and I'm playing around with WebGL and getting the error, "self.starshipVertexPositionBuffer is undefined". It looks like it's crashing (see comment below) when trying to access the ... |
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I am pretty new to Javascript having a bit of a problem with a website with Google Maps integrated. URL is http://beta.5vanmap.com. JS is in /js/map.js. I have two checkboxes (ccCheck and caccCheck). The basis is when the box is ticked, it overlays a KML onto the map. This is working fine in Chrome, but in FF and IE it doesn't ... |
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Please help to remove this error(Variable undefined) Hi friends Please help to remove this error from my webpage. Error is : "scroll1 is undefined" scroll1 is a variable which it says undefined. I dont know how to define it. Please read it carefully first before coming to any conclusion. Please take a look to this code. ############################################# Horizontal Image ...</p></div></td></tr><tr><td><div class='articleProductElement'><h3 class='articleProductElementTitle'>28. <a href='http://bytes.com/topic/javascript/answers/903908-why-am-i-receiving-undefined-error-when-setting-variable'>Why am I receiving 'undefined' error when setting a variable?</a><span class='articleProductElementHost'> bytes.com</span></h3><p class='articleProductElementParagraph'></div></td></tr><tr><td><div class='articleProductElement'><h3 class='articleProductElementTitle'>29. <a href='http://forums.devshed.com/javascript-development-115/need-help-accessing-a-variable-returns-undefined-590741.html'>Need help accessing a variable - returns undefined</a><span class='articleProductElementHost'> forums.devshed.com</span></h3><p class='articleProductElementParagraph'>Code: /* * ImageInfo 0.1.2 - A JavaScript library for reading image metadata. * Copyright (c) 2008 Jacob Seidelin, [email]jseidelin@nihilogic.dk[/email blog.nihilogic.dk * MIT License nihilogic.dk/licenses/mit-license.txt */ var useRange = true; var Range = 632; var iOffset = 2; var width; function readFileData(url) { BinaryAjax(url,function(http) {findEXIFinJPEG(http.binaryResponse);test(width)},null,useRange ? [0, Range] : null); } function findEXIFinJPEG(oFile) { while (iOffset < oFile.getLength()) { var iMarker ...</p></div></td></tr><tr><td><div class='articleProductElement'><h3 class='articleProductElementTitle'>30. <a href='http://forums.devshed.com/javascript-development-115/undefined-variables-from-textfields-434939.html'>Undefined variables from textfields</a><span class='articleProductElementHost'> forums.devshed.com</span></h3><p class='articleProductElementParagraph'>Can anyone tell me why the variables charge and state would be showing up as 'undefined' with the following script. I am using this with a form to get the values of two text fields. The names of the textfields are chargetotal and bstate. The script is working to write values into the textfields but it is not getting the initial ...</p></div></td></tr><tr><td><div class='articleProductElement'><h3 class='articleProductElementTitle'>31. <a href='http://forums.devshed.com/javascript-development-115/displaying-undefined-unable-to-find-variable-365058.html'>Displaying "undefined" - unable to find variable?</a><span class='articleProductElementHost'> forums.devshed.com</span></h3><p class='articleProductElementParagraph'><HTML> <HEAD> <TITLE>Comic Archives |