GetElementById Not Returning Value - Undefined
Dec 10, 2010
None of my getElementById (or other) references produce anything but "undefined." This occurs in the latest versions of Fx, IE, Chrome, and Safari, so it must be something I am doing but not not seeing here. I have boiled it down to the following without success, and wonder whether there is some add on interaction. Fx 3.6.12 has the problem with this code:
<code>
<html>
<head>
<title>This is a test of getElementById</title>
</head>
<body>
<div id="area" name="area_name">xxx</div>
<script type="text/javascript">
var divs = document.getElementsByTagName('div');
var msg = '';
msg = 'Divs[0] contains ' + divs[0] + ' with width = ' + divs[0].width + "
";
msg +='Test area width by id = ' + document.getElementById('area').width + "
";
msg +='Test area width by name = ' + document.getElementsByName('area_name').width;
alert(msg);
</script>
</body>
</html>
</code>
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Sep 12, 2011
I can not for the life of me get an ajax example/tutorial to work. I have tried dozens including prototype library and JQuery.
Here is my latest attempt:
As you can see I am trying to alert the variable teamH but I keep getting an undefined in the alert. I also tried a static drop down and I received the same undefined alert.
How I get that variable to contain my drop down choice?
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May 25, 2006
This function was working in Safari but not in Firefox. I was referencing a couple of elements using the forms[] array instead of getElementById(). I changed those refernces to use getElementById() and now the calculateTotals function does not work in Safari or Firefox.
So I did an alert box to see ucell and it was null. I tried two more alert boxes for the id I was passing to getElementById and for the id of the actual element on the page (which was also created dynamically). They were both identical. The element is created in the onload event, and I am not calling the calculateTotals function until there is onchange event on a text box. So it is not that the element has not been created yet. . Code:
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Nov 27, 2004
Is there something wrong with my script? Typo?
function accite() {
bq = document.getElementById("content").getElementsByTagName("blockquote");
q = document.getElementById("content").getElementsByTagName("q");
alert(
"<blockquote /> = " + bq.length +
"<q /> = " + q.length
);
}
It's saying "document.getElementById('content') has no properties", and yes, I definitely have a <div id="content" />.
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Feb 20, 2009
I am working on a very simple code to determine the highest value from an array and also use parallel arrays.
The problem I am having is, when I try to invoke the parallel array namesArray it returns undefined.
I have coded the function so it can be used to find the highest value in more arrays as this is only the beginning of my code. Im not sure if this is what is causing the problems but I have a feeling it is code...
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Sep 26, 2009
Here is a clip of code from a script project im working on. Now my document.getElementsByTagName is returning a "undefined" value.
<a href="[URL]" style="text-decoration: none; color: #EDDBAF; font-size: 16px;">
<center style="margin-left: 10px; margin-right: 10px;">
<font style="color: #EDDBAF; font-size: 16px;" id="title"></font>
</center></a>
<li id="name"><a http="[URL]" style="color: blue;">John Doe</a></li>
<script type="text/javascript">
var pname = document.getElementById('name').getElementsByTagName('a');
Now if I remove the ".getElementsByTagName('a')" it will actually work, but it also includes the <a> tag thats within the <li> tag, which I don't want.
document.getElementById('title').innerHTML=pname.innerHTML;
</script>
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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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Sep 19, 2009
I am using getJSON to get results from a different domain and i wantedto get _some_ object back when calling getJSON so that i can insertsome variables into the callback scope.Basically, what i wanted to do was this:
var new_json = $.getJSON(url, function(data) {
alert
(this.variable_from_caller);
[code]....
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Oct 20, 2010
I have a function where in I call another function that assigns a value to a var. code...
For some reason my code below is returning 'undefined'. But when I place an alert(); before the 'return' it shows the correct value. However when I place an alert(); to show the var that is set to what the function returns it says 'undefined'.
Firebug throws no errors. I am using a little bit of jQuery.
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Jan 27, 2009
Here's the problem: I have several hidden divs containing information. When you click on a link, javascript executes which is supposed to move the appropriate info from one of the hidden divs into the visible 'body' div. The javascript isn't working, though, and I'm getting 'undefined' instead
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Jan 30, 2009
document.getElementById (which + "sel").value = document.getElementById (which + "sel" ).value + "'" + document.getElementById (itemtocheck+i).parentElement.title + "',";
Error: document.getElementById(itemtocheck + i).parentElement is undefined
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Jul 14, 2010
Using jQuery v1.4.2, Firefox 3.6.6, Chrome 4.1, IE 6,7,8.
I'm using jQuery .css() function to get the value of the css attribute "background". The attribute has not previously been assigned a value (either in script or style sheet).
e.g. alert($(this).css("background"));
In Firefox and Chrome, the return value is an empty string (""). However in IE 6,7,8, the return value is "undefined".
It also makes the following statement impossible:
alert($(this).css("background").indexOf("somepic.gif"));
Because css() in IE doesn't return a blank string, doing indexOf() raises an error.
cross-browser scripting compatibility, for jQuery to return a blank string *for all browsers* if the css attribute isn't set. Otherwise we have to check for both "" or "undefined" which is the sort of pain jQuery users are trying to avoid.
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May 13, 2004
I want to restrict getElementById to search children of a specific element instead of searching the entire document, in the same way that I can do getElementsByTagName using a specific element as the parent.
In this particular instance the parent is a table and the elements I'm interested in are all TDs, so I did the basic getElementsByTagName('TD') off the table and looped through this array checking the IDs. However, I'm suspecting that the browser can do getElementById faster than I can do a loop in javascript. Is there a neater way to do this? For now, I'll settle for IE-only solutions, though it would be nice to have things work in generic browsers.
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May 31, 2011
I keep getting an error stating "getElementById("ballElement") is null, but I have a div with that exact id. I have looked at the JS script before that line, but found no errors there either. Please take a minute to see if you find something.
[Code]...
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Jul 20, 2005
here's what we have in an html file.
<form .....
<input type=button name="comment" onclick=" prompt('enter comment','
' )" >
Is there anyway to get the value returned from the prompt in the statement
above, into the value of the statement below ?
<input type=hidden name="comment_text" value = ???? >
We would like the user to click the "comment" button, have another window
popup where they enter their comment, and then take the comment text and
append it to the value parameter of the hidden statement.
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Mar 27, 2009
The following code is supposed to return a variable containing text, currently the code posts the data but returns an "undefined" variable. Can someone tell me what's wrong? code...
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Mar 27, 2007
I am trying to turn all the bullet points Li id values so i can store them.. I have written the code below but all this does it return the number of li's, everything i have done to bring out the id of the li, it fails. Code:
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May 21, 2010
I know this is probably a really simple this to do, but for the life of me I can't figure it out. I want to find out the value of a style for a certain element. So say in the CSS I said 'content' had a width of 100px, but I want to get that value with Javascript.
Here's my shot at it:
alert(document.getElementById('content').style.width);
I just get null.
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Mar 3, 2009
I'm not overly proficient at Javascript, but have fumbled my way through some tutorials to come up with the following code to create a tab mechanism.
It works perfectly in Firefox, Safari, Chrome and IE8. However, in IE6 and IE7 it fails to operate as of the 'for (var i in temp) {' line. It doesn't error out, it just doesn't perform any of the functions within the for.
Some things I've noted: * In Firefox if I alert(i) below the for, then it alerts the numerical value of i correctly through the for loop. * In IE7, however, alert(i) alerts the value 'toJSON' and nothing more. It never finds 'if (i <= maxlen) {' to be true as a result.
Any thoughts on what's going wrong here?
Code JavaScript:
function toggle_visibility(showid, hideids) {
$(showid).style.display = 'block';
// Change CSS
[Code]....
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Oct 14, 2009
I'm using Jquery to return the value of an input box based on the ID of that input box but can't seem to get the syntax to work.
Code JavaScript:
var partNo = $('.quantity input').attr('id');
var quantity = parseInt($('.quantity input id').val());
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Mar 27, 2009
I would like to document.write the status value using the return function but I can't get it to work.
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<html>
<head>
<script type="text/javascript">
[Code].....
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Dec 13, 2006
i am calling a javascript which is returning NaN and is getting printed
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Feb 18, 2009
Why is my function returning the wrong value??
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Oct 4, 2007
I've created a script that should display a certain image based on the day of the week and the time of the day. After uploading the page to the site I receive no errors, however I'm not getting the display I should be seeing. It always returns the image from the final "else" statement. I'm thinking the problem is that I have two "&&" operators in each "if" statement, and I don't have the proper syntax, or perhaps I'm not writing it properly. Code:
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Mar 7, 2006
Need some help with my For loop. The issue is that, my loop is only returning the values of the last item in the js file. I want the select box to include all possible names.
Code:
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Mar 5, 2003
Is there any way of returning all the fields in a layer?
I got a bunch of input fields grouped in different layers inside a form. When someone changes something in one input field in that LAYER, I want it to validate the whole layer, but not the whole form.
Is there anyway of returning all the input fields in that layer as a collection perhaps?
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