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Javascript错误:是Null或不是一个对象。
原标题:Javascript Error : Is Null or Not an Object
  • 时间:2010-02-22 06:15:32
  •  标签:
  • javascript

i 正在使用html输入箱,该箱在更新小组内,需要 cur在装上该投入箱后,即称为以下功能:

身体加载="javascript:document.Default.UserInputTextBox.focus();"

但是我收到了以下的JavaScript报错。

微软 JScript 运行时错误:document.Default.UserInputTextBox 为空或不是对象。

请帮忙。

问题回答

你必须等待DOM准备就绪才能尝试访问其中的元素;onload事件侦听器可以等待整个文档加载完毕,包括图像和CSS...这可能是不希望发生的。

<head>
    <script type="text/javascript" charset="utf-8">
        // wait for the DOCUMENT to become ready.
        window.onload=function(){
          walkmydog()
        }
    </script>
</head>

http://www.javascriptkit.com/dhtmltutors/domready.shtml” rel=“nofollow noretinger” http://www.javascriptkit.com/dhtmltutors/domready.shtml。

很多人使用JavaScript框架,如jQuery,MooTools,YUI,以克服浏览器兼容性问题。

我认为在通达性方面,动态更改用户的焦点并在通知用户之前并不是最好的利益。您可以执行的可访问操作是将用户重定向到指向文档对象的id属性的片段URI。这样您就不需要使用任何JavaScript。

So, for instance, if a user requests a page at this URI:
http://example.com/page.html

You can redirect the user with your ASP code and a HTTP 302 code to this page:
http://example.com/page.html#myInputIDValue

That would presume the input field in question had the following attribute:
id="myInputIDValue"





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