document.getElementById (still) not working

Question

I started a thread here http://stackoverflow.com/questions/1266470/document-getelementbyid-not-working but it looks as though even the suggestions made were valid I still have a problem.

I have a couple of checkboxes. When i view the page source here there are. document.getElementById('chk1') is the only one that is not null. How could that be?

<input id="chk0" value="JobStages###StageCode~JobCode###DRAW~1005" onclick="addRemoveRow(this.value,this.checked)" style="border-width:0px;padding:1px;margin:0px;height:14px;"  type="checkbox" />

<input id="chk1" value="JobStages###StageCode~JobCode###FEAS~1005" onclick="addRemoveRow(this.value,this.checked)" style="border-width:0px;padding:1px;margin:0px;height:14px;"  type="checkbox" />

<input id="chk2" value="JobStages###StageCode~JobCode###N/C~1005" onclick="addRemoveRow(this.value,this.checked)" style="border-width:0px;padding:1px;margin:0px;height:14px;"  type="checkbox" />

EDIT: Pretty much the complete code

<tr id='rw1' onMouseOver='setHover(this,event);' class='DRAW~1005      '
    onClick='setClick(this,event);'>
    <td id='RowId_0' width=0 style='display: none'>1</td>

    <td id='PrimaryKey_0' width=0 style='display: none'>DRAW~1005</td>
    <td id='StageCode_0' width=0 style='display: none'>DRAW</td>
    <td id='Allocated_0' nowrap
     style='overflow: hidden; height: 16px; width: 136px; overflow: hidden; text-align: center; padding-left: 5px;'
     class='col1'><input id="chk0"
     value="JobStages###StageCode~JobCode###DRAW~1005"
     onclick="addRemoveRow(this.value,this.checked)"
     style="border-width: 0px; padding: 1px; margin: 0px; height: 14px;"
     type="checkbox" /></td>
    <td id='StageCode_0' nowrap
     style='overflow: hidden; height: 16px; width: 136px; overflow: hidden; text-align: left; padding-left: 5px;'
     class='col2'></td>
    <td id='StageDescription_0' nowrap
     style='overflow: hidden; height: 16px; width: 123px; overflow: hidden; text-align: left; padding-left: 5px;'
     class='col3'
     onclick="showTextEditor(event,'JobStages','StageDescription','StageCode~JobCode','DRAW~1005      ');">
    </td>
    <td id='StartDate_0' nowrap
     style='overflow: hidden; height: 16px; width: 171px; overflow: hidden; text-align: left; padding-left: 5px;'
     class='col4'
     onclick="showCalendar(event,'JobStages','StartDate','StageCode~JobCode','DRAW~1005      ');">
    </td>
    <td id='EndDate_0' nowrap
     style='overflow: hidden; height: 16px; width: 112px; overflow: hidden; text-align: left; padding-left: 5px;'
     class='col5'
     onclick="showCalendar(event,'JobStages','EndDate','StageCode~JobCode','DRAW~1005      ');">
    </td>
</tr>

<tr id='rw2' onMouseOver='setHover(this,event);' class='FEAS~1005      '
    onClick='setClick(this,event);'>
    <td id='RowId_1' width=0 style='display: none'>2</td>

    <td id='PrimaryKey_1' width=0 style='display: none'>FEAS~1005</td>
    <td id='StageCode_1' width=0 style='display: none'>FEAS</td>
    <td id='Allocated_1' nowrap
     style='overflow: hidden; height: 16px; width: 136px; overflow: hidden; text-align: center; padding-left: 5px;'
     class='col1'><input id="chk1"
     value="JobStages###StageCode~JobCode###FEAS~1005"
     onclick="addRemoveRow(this.value,this.checked)"
     style="border-width: 0px; padding: 1px; margin: 0px; height: 14px;"
     type="checkbox" /></td>
    <td id='StageCode_1' nowrap
     style='overflow: hidden; height: 16px; width: 136px; overflow: hidden; text-align: left; padding-left: 5px;'
     class='col2'></td>
    <td id='StageDescription_1' nowrap
     style='overflow: hidden; height: 16px; width: 123px; overflow: hidden; text-align: left; padding-left: 5px;'
     class='col3'
     onclick="showTextEditor(event,'JobStages','StageDescription','StageCode~JobCode','FEAS~1005      ');">
    </td>
    <td id='StartDate_1' nowrap
     style='overflow: hidden; height: 16px; width: 171px; overflow: hidden; text-align: left; padding-left: 5px;'
     class='col4'
     onclick="showCalendar(event,'JobStages','StartDate','StageCode~JobCode','FEAS~1005      ');">
    </td>
    <td id='EndDate_1' nowrap
     style='overflow: hidden; height: 16px; width: 112px; overflow: hidden; text-align: left; padding-left: 5px;'
     class='col5'
     onclick="showCalendar(event,'JobStages','EndDate','StageCode~JobCode','FEAS~1005      ');">
    </td>
</tr>

Answer 1

just a hunch, but maybe ie8 doesnt like it when the input dont have a name (especially since they are checkboxes)

Answer 2

You are probably executing the javascript before the DOM nodes are available.

this will not work

<script type="text/javascript">
  // trying to retrieve #chk1 before it exists in the DOM!
  document.getElementById('chk1');
</script>

<input id="chk1">

Whereas either of these will

<input id="chk1">

<script type="text/javascript">
  // #chk1 exists in DOM, this works
  document.getElementById('chk1');
</script>

or

<script type="text/javascript">
  // Force execution to wait until window is done i.e, DOM is ready
  window.onload = function()
  {
    document.getElementById('chk1');
  }
</script>

<input id="chk1">

EDIT

I copied your entire chunk of HTML from above, added this to the end of it

<script type="text/javascript">
alert([ 
    document.getElementById('chk0')
  , document.getElementById('chk1')
]);
</script>

and opened it in IE7. The alert produced [object],[object] which means it worked and found both nodes. Not sure what to tell you.

Answer 3

Are you using the .checked property of the checkbox to see if it is checked or not? Take a look at this example. It explains how you may evaluate a checkbox's check state.

http://www.developertutorials.com/tutorials/javascript/controlling-checkboxes-javascript-050629/page1.html

Answer 4

Are you using chk0 and chk2 as the element id for any other html element on the page.

Answer 5

I agree with the other answer, you are probably trying to access the dom before its loaded. Try this

window.onload = function(){alert(document.getElementById('chk1'));}

See how that works for ya

Answer 6

With Jquery, try this:

<script type="text/javascript">
  $().ready(function() {
    $('#chk1');
  });
</script>

It will execute once the DOM is ready to be manipulated, this should fix your issue.