从javascript分配一个字段并从CodeBehind检索它 [英] Assign a field from javascript and retrieve it from CodeBehind

问题描述

我只是在做:

Javascript:

I''m just doing :

Javascript:

function assign(){
 var sHidVar = 'something';
 document.getElementById('<%=hdnPage.ClientID%>') = sHidVar ;
 alert(document.getElementById('<%=hdnPage.ClientID%>'));
}

ASPX

ASPX

...
 <asp:HiddenField ID=hdnPage runat=server  />
...

这是我执行此操作时遇到的问题:
ASPX:

Here is the problem when I do this:
ASPX :

<a href=#  önclick="Javascript:assign();">Test</a>

它运行正常，已分配了变量，我可以从CodeBehind访问以下对象:

it runs fine, the variable is assigned and I can access from CodeBehind by:

string s = hdnPage.Value;

但是，要在页面加载时运行此功能，例如:

but, to run this function on page load like :

protected void Page_Load(object sender, EventArgs e)
...
ClientScript.RegisterClientScriptBlock(this.GetType(), "assign", "assign();", true);
..
}

它给出一个错误，说document.getElementById(...)不是对象

在页面加载时我还能如何调用该函数，该函数有什么问题吗?

PS:还尝试了

it gives an error, saying document.getElementById(...) is not an object

how else can I call the function on page load, of is there something wrong with the function

PS: Also tried the

$('<%=hdnPage.ClientID%>')

无效

推荐答案

(' <％= hdnPage.ClientID％>')

，不起作用

放置您的JavaScript函数在标记和测试结束之前.

Place your JavaScript function before just before the end of the tag and test.

您无法在服务器端page_load上调用javascript函数.为此，您需要像这样使用javascript window.onload事件

You cannot call the javascript function on server side page_load. For that you need to user javascript window.onload event like this

window.onload=function assign(){
 var sHidVar = 'something';
 document.getElementById('<%=hdnPage.ClientID%>') = sHidVar ;
 alert(document.getElementById('<%=hdnPage.ClientID%>'));
}

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