其中一个对象为null [英] Got null for one of the objects

问题描述

在我的.html文件中，我定义了2个对象如下：

In my .html file, I defined the 2 objects as below:

<div id="selectedListTable" class='styleTable2' style="height:220px;width:565px;" />
<div id="loader_" class='loader' style='display:none;' />

在js代码中，我得到v但v2为null

In the js code, I got v but v2 as null

var v = document.getElementById("selectedListTable");
var v2 = document.getElementById("loader_");     // v2 is null

我不知道为什么？如果你能指出原因，请感谢。



我尝试过：



其中一个对象为null

I don't know why? Appreciate if you can point out the reason.

What I have tried:

Got null for one of the objects

推荐答案

你的HTML有点混乱：

Your HTML is a bit of a mess:

<div id="selectedListTable" class='styleTable2' style="height:220px;width:565px;"/>
<div id="loader_" class='loader' style='display:none;' />

已过时且可能无效 - 似乎没有任何内容内容。除非是后续操作的目标，否则它们看起来毫无意义，除了占用空间。

is obsolete and likely invalid - and don't seem to have any content. Unless the target of a later operation, they seem rather pointless, except to take up space.

<div id="selectedListTable" class='styleTable2' style="height:220px;width:565px;"></div>
<div id="loader_" class='loader' style='display:none;'></div>

是应该看的样子 - 包含开始和结束元素之间的内容



如果您的浏览器无法解释这个问题，那么它可能没有两个不同的id =''属性。使用'/>'关闭元素不再是可接受的 - 尽管可能不会通过错误，具体取决于元素。例如，和< img src =>只是在没有反斜杠的情况下关闭。对于< input>也是如此。元素，而像< div>>需要结束< / div>>



假设它不是基于页面上其他地方的问题，请交换两个数据请求，看看你是否v2和v现在为空。

is how they should look - with content between the opening and closing elements

If, perchance, your browser has trouble interpreting this then it may not have the two id='' attributes distinct. The closing of an element with '/>' is no longer "acceptable" - although may not through an error, depending upon the element. For example, and <img src=""> simply closes without the backslash. This is also true for <input> elements whilst something like a <div>> requires a closing </div>>

Assuming it isn't based on a problem elsewhere on your page, swap the two data request and see if you v2 and v is now null.

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