document.getElementById（仍然）不起作用 [英] document.getElementById (still) not working

问题描述

我在这里开始了一个帖子 document.getElementById不工作，但它看起来好像甚至是提出的建议是有效的我仍然有问题。

I started a thread here document.getElementById not working but it looks as though even the suggestions made were valid I still have a problem.

我有几个复选框。当我在这里查看页面源时。 document.getElementById（'chk1'）是唯一不为null的文件。怎么会这样？

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" />

编辑：几乎完整的代码

<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>

推荐答案

您可能在DOM节点之前执行javascript可用。

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

这不起作用

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

<input id="chk1">

其中任何一个

<input id="chk1">

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

或

<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">

编辑

我复制了你的整个块来自上面的HTML，将其添加到它的末尾

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>

并在IE7中打开它。警报产生 [object]，[object] ，这意味着它工作并找到了两个节点。不知道该告诉你什么。

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

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