Why Certain Variable In Code Remains Undefined
Jul 22, 2011
We are currently re-working a client's website and as I am not a javascript programmer I am having trouble understanding some of the code, and need help understanding why a certain variable in the code remains undefined.
What is happening is that the user is filling in 24 lines of 4 select boxes, in which there must be 1 and only one "m" and 1 and only 1 "l". The code changes the value of the box back to blank if the user has tried to enter >1 of either. The code then should check the line number and count the number of lines, but on debugging I see that the value of variables el and LineNo are undefined. I can't understand why when the function is called, the value "this" is used. i.e CheckLine(this) - this appears to have no value in the html code as far as I can see!
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Jan 17, 2009
I am trying to write a snippet to put in my form and cannot get it to run. I keep getting an undefined error for the variable 'Code' no matter what I do.The goal is present obtain a Time Frame based on an SVCode selected from a group of radio buttons.
<html>
<head>
<script language="text/javascript">[code]...........
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Aug 24, 2010
I have a php page in which I declared a js variable... right at the top of the page...
<script type="text/javascript">
var tester = 0;
</script>
[code]....
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Aug 25, 2006
I am having some fun with javascript, and I came upon a site, on the site you have to try to figure out the passwords which are embedded in javascript, now im on the last level but i have no clue whats going. It seems to be an undefined variable. Can anyone point me in the right direction? Code:
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Jul 23, 2005
Does anyone know why the onclick in the following popup menu gives
the error:"Val is undefined"? Does it have something to do with the
fact that it is called within the variable tablePop? Because it IS
displayed properly as part of the popup text, where it is called
outside the single quotation marks (see [***]). It is only in the
onclick that it's causing problems. Code:
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Jul 20, 2005
Any ideas as to how I can get ride of the script error undefined
variable "Exp_Month"?
I am trying to get this drop down list to default to the current month
as opposed to 01.
Thank you in advance.
<SELECT size="1" name="Exp_Month">
<OPTION value="01" selected>1</OPTION>
<OPTION value="02">2</OPTION>
<OPTION value="03">3</OPTION>
<OPTION value="04">4</OPTION>
<OPTION value="05">5</OPTION>
<OPTION value="06">6</OPTION>
<OPTION value="07">7</OPTION>
<OPTION value="08">8</OPTION>
<OPTION value="09">9</OPTION>
<OPTION value="10">10</OPTION>
<OPTION value="11">11</OPTION>
<OPTION value="12">12</OPTION>
</SELECT>
<script type="text/javascript">
var now = new Date()
Exp_Month.selectedIndex = now.getMonth()
</script>
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Aug 28, 2009
I code my global variables first, then my window.onload function, like this code...
Why do I get the error:
"KBINPUT IS NOT DEFINED"?
and
Why doesn't the IF statement for UNDEFINED element catch the problem?
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Dec 12, 2010
When I click my button, window.frames['akFrame'].document.getElementsByName('auth_key').value is undefined, and I cant seem to make the if else statement work.
<script type='text/javascript'>
url=location.href.split('/')[4];
url=location.href.replace(url,'')
[code]....
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Sep 21, 2006
I'm currently coding the beginnings of a stopwatch script.
<html>
<head>
<script type="text/javascript">
var startTime;
var currentTime;
var started = 0;
function startStopwatch() {
if (started == 0) {
var startTime = new Date();
display();
alert(startTime);
}
}
function display() {
currentTime = new Date();
difference = (Number(currentTime) - Number(startTime));
document.stopwatch.display.value = difference;
setTimeout('display()',10)
}
</script>
</head>
<body>
<form name="stopwatch">
<input type="text" name="display" readonly="readonly" size="40">
<input type="button" name="start" value="Start" onclick="startStopwatch();">
<input type="button" name="stop" value="Stop">
<input type="button" name="reset" value="Reset">
</form>
</body>
</html>
The value of startTime when called from display() is undefined. I'm not sure why, as I declared the variable outside the function. The variable should be accessible by all functions, right?
Any help would be appreciated.
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Sep 17, 2010
I've boiled down my code to the essence of the problem; a variable which serves as a parameter to a function keeps coming up as 'undefined'. The code is quite simple:
....
<head>
<title>Yearly Calendar</title>
[code]....
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Jul 29, 2011
For some reason my variable is coming put with undefined.
I have looked and looked and i am sure it is obvious but i cannot figure it out.
How much of an amateur move i am making
Code:
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Sep 19, 2011
I have problems with js in IE. I have such script:
Code:
After that I have an onclick event:
Code:
commentController is defined in an external file. This works fine in all browsers except IE. In IE I have error 'cl' is undefined.
I tried to connect comment-controller file
Code:
But then I have the same error in firefox too.
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Oct 27, 2011
Getting undefined alert.[code]...
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Feb 6, 2011
I'm pulling my hair out because I have checked, checked and checked again and I cannot find the problem![code]...
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Sep 19, 2010
I'm poking around with objects and the differences of creating a variable outside an object and inside an object. Here's my code.This is just before the closing body tag:
Code JavaScript:
<script type="text/javascript">
// Creating an object[code]....
When i reload the page, i get an alert box stating the 1st message "Hello there" When i click on OK on the alert prompt. I get another prompt that says Undefined. I tried experimenting and found out that if i call the another() function within myObj without alerting it like so:
Code JavaScript:
myObj.another();
Then i just get an alert prompt with "Hello there" only...the second undefined message doesn't appear.
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Apr 5, 2011
I have a following snippet
var test = xmlhttp.responsetext
var msg="";
when i print the text as below
[Code].....
I could see the individual values in each index in firefox, but ie is displaying as undefined.
know whether this is not allowed in IE?. Is there any workaround for this?.
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Mar 4, 2009
I have been trying to figure this out for a few days now and have finally come to the point where I think I got it but may just need a little push to get what I want.
Heres the situation:
I have this function that uses ajax to access a database and returns the results in the responseText. That part is working fine, I have confirmed that the responseText contains the information that I need
**************code*****************************************
//new ajax already created and assigned to the variable xmlhttp//
var response_recieved = "some data";
function get_answer(Table_Name, Field_Name, Data_Type) {
[Code]....
As evidence by my posting, this is not working correctly. The variable response_recieved is coming up undefined outside of the callback function assigned to the onreadystatechangeproperty.
Based on the information that I have gathered online from various forums, I believe this issue has to deal with a problem with closure in the callback function assigned to onreadystatechange property. I don't think it has any. Based on the fact that there is no anonymous function in that function. But my problem is that the call back function is anonymous itself... I think???
get the variable response_recieved to survive outside of this function.
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Oct 27, 2009
I'm just starting out with Javascript as a development language and this will probably be a relatively simple problem for someone to solve for me.
I am trying to access a variable (this.bodyEl.innerHTML) from within a function but get an error message indicating that it is "undefined". I know that it is a valid variable because I call it elsewhere outside of the inner function itself.
I'm sure this is just a scope issue, but I'd welcome any suggestions on how to solve it with an explanation of where I've gone wrong if you have the time.
[Code]...
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Feb 13, 2009
I am trying to access the width variable from my main page. Within the imageinfo.js script functions I can alert() the width value which returns 1024. But I can't seem to pass this variable to my main page or access it directly so that I can use document.write() to write the variable on the page. Whenever I try to call the 'width' variable directly from the main page I get undefined. How can I access this variable? However, with the test code below, I was able to get ducument.write() to write the 'width' variable on the page but now the page doesn't stop loading - there's an endless loop in the code...
Code:
BinaryAjax(url,function(http) {findEXIFinJPEG(http.binaryResponse);test(width)},null,useRange ? [0, Range] : null);
Main page
Code:
<html>
<head>
<script>
function test(width){
document.write('Image Width = ' + width)
} </script>
<script type="text/javascript" src="binaryajax.js"></script>
<script type="text/javascript" src="imageinfo.js"></script>
</head>
<body>
<script type="text/javascript">readFileData('image.jpg')</script>
</body>
</html>
Imageinfo script - This script uses the binaryajax script found below.
Code:
/*
* ImageInfo 0.1.2 - A JavaScript library for reading image metadata.
* Copyright (c) 2008 Jacob Seidelin
*/ .....
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Jan 14, 2010
I am trying to fix up some code and have run into a problem. For some reason the line of code
Code:
var sizeQ = gid("q" + aq).length;
is not assigning a value when the page is loaded in firefox but in IE it works perfectly.
Code:
function testAnswers(aqNow,review,toClose){
//alert("inside test answers");
var listQa = gid("listQuestions").value;
[code]...
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Oct 1, 2010
[code] Hide from browsers that do not understand Javascript.The addLoadEvent function adds functions to the window.onload command to load multiple functions at startup function addLoadEvent(func)[code]When the page loads I get the nice alert box that says loading and then one that says count equals 0.When i click my edit list drop down and choose modify I get a message box that reads count equals in edit function 0.If I type text in the textbox and leave the text box I get an alert box that reads count equals in subcheck function Undefined and then another one that says NaN.
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Jul 23, 2009
I've written a function to format a number. It strips dollar signs and commas, converts to a number, and sets the number to two decimal places.However, I get the error message "amountNum is undefined". It occurs right where I use the replace command.[code]I am calling the function with this line of code:[code]
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Mar 7, 2011
I am pretty new to Javascript having a bit of a problem with a website with Google Maps integrated. URL 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 work, IE returns 'ccCheck is Undefined'. The code I am using is in the JS file, the bit it gets stuck at is as follows:
[Code]...
If I stick a ccCheck = document.getElementById('ccCheck') within the onclick function (before the if statement), it places the overlay onto the map, but then when I untick the box it just stays there. It's such a simple thing (I think), and must be down to IE being pedantic about declaring the variable properly, the question is how should I be doing this?
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Jun 7, 2009
I have a problem that 'test' is not passed. The following function alert undefined, but it should alert test. Why that?
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Dec 6, 2011
[Code]...
Result is undefined. I am setting global variable for javascript but it doesn't work?
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Feb 9, 2009
I'm not sure if JS or regular HTML is best for this, but i'm wanting accomplish the same effect as the color box rollover on the site below. I can figure out the rollover but i can't get it to stay. Example, rollover the red box and the headband changes from black to red, roll off and it remains red. [url]
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