Document.getElementById Comes Out NULL Help!

Jul 20, 2005

Basically i'm trying to draw a box over an image which
is turning out to be a nightmare. The problem i'm getting at the moment
is that i'm creating a line with <div which works when it's not hidden
but I need to be able to make it hidden so I can use layers to show all
when it finished drawing to make it smoother. This is how some other
scripts are doing it that i've seen. So i've got it drawing a line and I
need getElementById to pick out the layer but it's only picking out NULL
with the one i've got enabled below. I've tried the others but they just
come out as errors. I need to get top2 which is the <div line to show
itself but I can't seem to reference it by getElementById. I use linux
mozilla so i need it working in mozilla as well as windows that's why
i'm using getElementById. My code is below any ideas anyone?

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Error: Document.getElementById Is Null

Jul 6, 2010

Here's my code :

1: function myFunction(myLink, base) {
2: var myCheckBox;
3: var idx;

[Code].....

when I view source of the page , I see the values of sng_ids_{index} hidden parameters set correctly but I get this javascript error :

Error: document.getElementById("sng_ids_"+i.toString()) is null

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Error: Document.getElementById(divobj.id + "_info-toggle") Is Null

Jul 24, 2009

I modified a little a script from dynamicdrive.com (Animated Collapsible DIV v2.01[URL]... It works well, but something is wrong. When you click on the button image a javascript error popup appears:

An error exists inside your "ontoggle" function:
TypeError: document.getElementById(divobj.id + "_info-toggle") is null
Aborting execution of function.

You can see it in: http://cineout.es/div_test/divs_test2.html

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Error : "'document.getElementById(...)'is Null Or Not An Object "

Apr 30, 2010

I wrote the simple code in javascript but it dosent work its

document.getElementById("Label1").innerText = "Change";

but it gives an error : "'document.getElementById(...)'is null or not an object "

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Error: Document.getElementById("vsbtitle_1") Is Null

Feb 24, 2011

I'm getting the following problem. The reason is that the object appears through AJAX. But if I choose it NOT to appear it gives this problem. How can I avoid this? I put an if statement inline

Code:
if(document.getElementById('vsbtitle_1').value!=null){
thisurlext+='&btitle1='+document.getElementById('vsbtitle_1').value;
}

Error: document.getElementById("vsbtitle_1") is null

[Code].....

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GetElementById Element Null - Error Stating "getElementById("ballElement") Is Null

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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Document.getelementbyid - "resetButton" Is Null

Apr 29, 2010

I have a html file and a separate javascript file.

The html file contains: <input type="reset" id = "resetButton" />

I want a message to pop up if the reset button is pressed.

So in the js file I have: document.getElementById("resetButton").onclick = doAlert;

doAlert is a function that simply does: alert("Do you want to reset?");

I know my separate js file is linked correctly because if I just put in alert("hello"); in the js file then it works. But if I use the document.getElementById thing in the js file, then there is an error. The error, according to the error console, says that "resetButton" is null.

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Document.getElementById("divID") Is Null?

Sep 30, 2010

I have some javascript to test for screen resolution and if it's of size x it loads one flash file and if it's larger it loads a different flash file. The code is not in a function so it should run when the page loads. The test for screen resolution is working but firefox error console says document.getElementById("embed1") is null.I thought it might just not agree with my using innerHTML to add a flash file but when I just did

Code:
window.alert(document.getElementById("embed1").innerHTML); it still had the same error.

does javascript outside of a function run before some elements are loaded? I see no reason for this error.

Code:
<script type="text/JavaScript">
var screenwidth = screen.width;
if (screenwidth <= 1024) {[code].....

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Element.getElementById Instead Of Document.getElementById

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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GetElementById Returns Null?

Nov 8, 2009

Suppose I have the following inside a function:Code JavaScript:document.getElementById('display_content').innerHTML = "hello";The above works.However, when I define it like the following it says display_content is null on firefox error console.

Code JavaScript:
var display_content = document.getElementById('display_content');
 

[code]....

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GetElementById() Returning Null

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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GetElementById Function - ID Is Null

Sep 16, 2011

Why this simple script is not working. Trying to use getElementById() but Firebug says the ID is null. I've tried troubleshooting by accessing other ID's but they all come back 'null'. Trying to add 2 classes based on an ID:
<script>
pageId = 1;
if(pageId == 1) {
//alert('This is page' + pageId);
document.getElementById('arta').setAttribute("class", "menu-on menu-a");
}
<./script>

An online example is here: [URL]. I also tried accessing the id like below but got the same result:
document.arta.setAttribute('class', 'menu-on menu-a');

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GetElementById - Grabbed A Null Value Despite Any Value Input

Aug 29, 2010

For some reason getElementById continues to tell me that it had grabbed a null value despite any value I input. I am using firefox 3.6.8. Am I doing something wrong here?

[Code]...

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GetElementById Returns Null In IE - Works In Firefox

Jul 9, 2009

This seemed like it should be so simple. It works fine in Firefox, but not in IE. The goal is to disable the form's Submit button, until the question is answered. (The alert is for troubleshooting.)

Code:

Obviously, this HTML is in a form:

Code:

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Document.getElementByID And IE ?

Jun 4, 2010

The following code is not working for IE.

Code:

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Document.getElementById In JS?

Feb 15, 2011

i have the code in JS:

if(drop_list.value == "zed-catcher/11")
{
input_box.disabled=false;
var catcher_id = document.getElementById('lpm_service_catcher_id');
catcher_id.value = 11;

[Code]...

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What Is Better, Document.forms Or GetElementById?

Dec 21, 2006

I would like to know if is better to use document.forms to detect forms
or getElementById.

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Workaround For Document.getElementById

Mar 16, 2007

I have an onchange method for a select box that goes something like
this (the select is in a form named aForm):

function page_on_change() {
pageElement = aForm.my_page_id;
aForm.nav_page_name.value =
pages[pageElement.options[ pageElement.selectedIndex ].value];
var si = pageElement.selectedIndex;
for ( i = 0 ; i < pages.size ; i++ ) {
document.getElementById("id_" + i).style.display='none'
}
document.getElementbyId("id_" + si).style.display='none'
}

IE fails on the statement:

document.getElementbyId("id_" + si).style.display='none'

and says it doesn't support this property.

What is the workaround?

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Return A Value To A Document.getElementById()

Jan 28, 2009

I'm trying to do is change the backgroundColor of my input text with js..

This the js part

Code:

And this is the html part

Code:

Basicly what the script do is to check the hidden field cf with value of '0' if found it will execute changeCssProp(thefield)..but the problem is js return error of document.getElementById(thefield) is null

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Return A Value To A Document.getElementById() ?

Jan 28, 2009

I'm trying to do is change the backgroundColor of my input text with js..

This the js part

Basicly what the script do is to check the hidden field cf with value of '0' if found it will execute changeCssProp(thefield)..but the problem is js return error of document.getElementById(thefield) is null

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Document.getElementById Not Working In FF

Mar 24, 2010

I am trying to use document.getElementById in FF but its not working. There is a main page. in that mainpage there is a iframe and in that iframe (id = DocFrame) there is a textbox (id="fileuploadedcnt") which i am trying to access. there is no error. ofcourse i have given name and id to the textbox. Below is the code

function ConfirmCertificate(id , Project_ID , Subprogram_ID , ITCType_TI) {
frm=document.mainform;
//fileuploadedcnt = (document.frames("DocFrame").document.forms("upload_form").elements("fileuploadedcnt").value);

[Code].....

In the abpve case i tried both the name and id properties. with Name property i get the HTMLObj alert but again it fails if i attach value method. And for id, it doesnt work at all

No errors ofcourse in both the cases

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Document.getElementByID Not A Function?

Apr 18, 2002

I've got the following code on one of my pages, it works fine in IE6 and Netscape 6.2, but when you get around to using it on Netscape Navigator 4.08 it doesn't work, instead giving me a "document.getElementByID is not a function" error. Here's the code it has a problem with...

function CrseDets(IDS) {
window.open('coursedetails.asp?whereby=' + document.getElementById(IDS).value,null,'top=0,left=0,width=672,height=500, background="gfx/backgrd.gif", scrollbars=yes');
}

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Document.getElementById('xxx').src Is Not Working

Jun 2, 2010

I have the following code. It is not working for firefox, IExplorer and Opera.

<script id="url" name="url" language="JavaScript" type="text/javascript" src=""></script>
<script language="JavaScript" type="text/javascript">
var u = document.getElementByName("url");

[Code]....

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IE Vs Document.getElementById - Get Error

Jun 19, 2010

I use in my javascript the "document.getElementById" code.

This code works as it should in Firefox, but in IE I get the following error:

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Document.getElementbyId Is Not Working?

Oct 6, 2010

This code is not working What i am doing wrong here?


HTML Code:
<script type="text/javascript">
document.getElementById("divName").style.height = 500px;
</script>

[Code]...

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Document.getElementById().value Not Working?

Apr 12, 2010

I am validating a three form field which takes temperature value between 0-50, humidity 1-100 & rainfall 0-200. I am able to see expected result for temperature value but not getting correct value for humidity & rainfall(still one can insert text in it..)

Here is my code-:
<script type="text/javascript">
function validate_form(thisform)
{
with (thisform)

[Code]...

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