为什么的JavaScript无法获得ASP：标签的innerText？ [英] Why is javascript unable to get asp:Label innerText?

问题描述

我有两个标签：用户名和电子邮件。我用它们来检索他们的内容，并将它们传递方法参数。

I have two labels: username and email. I use them to retrieve their content and pass them as method parameters.

var lblEmail = $get('<%= lblEmail.ClientID %>');
var email = lblEmail.innerText;

var lblUsername = '<%= lblUsername.ClientID %>';
var username = lblUsername.innerText;

电子邮件标签在为用户名的标签做同样的方式定义，但最后我不能让值，innerText属性返回undefined。

The email label is defined in the same way as username label does, but for this last I can't get the value, innertext returns undefined.

...

<td class="inputField">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<asp:Label ID="lblUsername" CssClass="font1" runat="server"/>
</tr>
</table>
</td>

...

...
<td class="inputField">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td>
<asp:Label runat="server" ID="lblEmail" CssClass="font1" />
</td>
...

什么可能是一个可能的理由来证明发生了什么？我怎样才能解决这个问题？我看到页面上的两个标签值，我把它们放在同一个地方（页面加载时）。

What could be a possible reason to justify what is happening? How can I solve this problem? I'm seeing on the page both label values, I set them on the same place (when page loads).

推荐答案

由于您只定义输入用户名标签客户端ID：

Because you defined only the client ID for the userName label :

var lblEmail = $get('<%= lblEmail.ClientID %>');
var email = lblEmail.innerText;

var lblUsername = '<%= lblUsername.ClientID %>';
var username = lblUsername.innerText;

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