无法通过javascript找到div [英] Can not find div by javascript

问题描述

大家好.

我有一个JavaScript函数，可在运行时调整列的height(div).

抛出异常，表明需要对象.

以下是我的功能...

Hi all.

I have a javascript function which adjusts the column height(div) at runtime.

An exception is thrown saying object required.

Following is my function...

function AdjustColumnsHeight() {
    // get a reference to the two DIVS that make up the columns
    var centerCol = window.document.getElementById(''centercol'');
    var leftCol = window.document.getElementById(''leftcol'');
    // calculate the max height

    var hCenterCol = centerCol.offsetHeight;
    var hLeftCol = leftCol.offsetHeight;
    var maxHeight = Math.max(hCenterCol, hLeftCol);

    // set the height of all 2 DIVS to the max height
    centerCol.style.height = maxHeight  + ''px'';
    leftCol.style.height = maxHeight  + ''px'';
      }

以下是我的母版页.

And Following is my Master Page..

<div id="container">

        <div id="leftcol">
            <leftMenu:Leftmenue ID="leftMenu1"  runat="server" />
        </div>

        <div id="container2">
            <div id="centercol">
<asp:ContentPlaceHolder id="MainContent"  runat="server">      /asp:ContentPlaceHolder>
            </div>
        </div>
</div>

如果我将centercol div放在首位，那么将找不到leftcol并且
如果我先把leftcol div放，那么就找不到centercol


请帮我，我很困惑.

If I put the centercol div first,then leftcol cannot be found and
If I put the leftcol div first,then centercolcannot be found


Please help me I am in puzzled

推荐答案

我试图按照您所说的那样从window.onload调用.如果div位于表单内，则可以正常工作

I tried to call from window.onload as you said.Works fine if div is inside form

<form id="form1" runat="server"> </form>

看起来您错误地放置了div，这可能会导致问题.将其放置在表单标签&中；再次测试.

Looks like you have placed div wrongly which might be causing the issue.Place in form tag & test again.

使用FF的FireBug和IE的IEWebDeveloper工具查找控件ID.因为如果内容占位符asp.net中的控件在控件ID前面放了一些前缀，例如ctl00_.我建议，如果您不熟悉控件ID，那么可以使用上面提到的一些工具来找到控件ID.

use FireBug for FF and IEWebDeveloper tool for IE to find control ID. because if the control in content placeholder asp.net put some prefix to control id like ctl00_. I suggest if you do not know the control id better to find control id using some tools I mentioned above.

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