为什么javascript无法获取asp:标签innerText？

Question

我有两个标签:用户名和电子邮件.我使用它们来检索它们的内容并将它们作为方法参数传递.

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

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

电子邮件标签的定义方式与用户名标签的方式相同,但最后我无法获取值,innertext返回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>
...

什么可能的理由来证明正在发生的事情？我怎么解决这个问题？我在页面上看到两个标签值,我将它们设置在同一个地方(当页面加载时).

Answer 1

在代码的第二部分

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

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

$ get call缺席.应该

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

var lblUsername = $get('<%= lblUsername.ClientID %>');
var username = lblUsername.innerText;