无法在javascript中获取asp.net标签的价值 [英] Uneable to get asp.net label's value in javascript

问题描述

使用

  document  .getElementById（' <％= myID.ClientID％>'）。value; 

我能够检索asp：TextBox控件的值，但不能检索asp：Label控件的值。对于Label控件，我总是得到

无法获取未定义或空引用的属性值

这个问题有什么暗示吗？谢谢。



我的尝试：



多次尝试标签控件但不成功。

解决方案

A < asp：Label> 呈现为< span> 或< label> 元素。这些元素没有值属性。相反，您需要阅读 innerHTML 属性以获取标签文本。



但是，错误消息表明您的标签元素在文档中不存在。您需要查看页面的渲染源，检查传递给 getElementById 的值，并确保文档中有一个带有该ID的元素。

Using

document.getElementById('<%=myID.ClientID%>').value; 

I am able to retrieve the values of asp:TextBox controls but Not the values of asp:Label controls. For the Label controls, I always get

Unable to get property 'value' of undefined or null reference

Any hint for this problem? Thanks.

What I have tried:

Multiple Tries on the Label controls but not successful.

解决方案

A <asp:Label> renders as either a <span> or a <label> element. Those elements don't have a value property. Instead, you would need to read the innerHTML property to get the text of the label.

However, the error message suggests that your label element doesn't exist in the document. You need to view the rendered source of your page, check the value you're passing to getElementById, and make sure there's an element with that ID in the document.

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