获取隐藏字段的价值 [英] Getting the Value of Hidden Field

问题描述

我有个问题.我在dropdownlist的onChange事件中调用一个Java脚本.在该Java脚本中，我为隐藏字段设置了一个值，但是当页面回发时，隐藏字段的值变为null(DropdownList具有SelectedIndexChanged事件，其AutopostBack属性为True.此属性必须为true.).我想检查Java脚本设置的dropdownlist的服务器端代码上的隐藏字段"的值.任何人都可以帮助我.
我的JavaScript代码是-

Hi,
I have a problem. I call a java script in onChange event of dropdownlist.In that java script i have set a value to a hidden field but when the page is post backthe value of hidden field becomes null(DropdownList has a SelectedindexChanged Event and its AutopostBack Property is True.This Property Must be true.).I want to check the value of Hidden Field on Server side code of dropdownlist which was set by java script.Any one can help me.
My javascript Code is-

function ChaekDdl(id)
    {
   
    var ddl=document.getElementById(id);
    var hiddenField = document.getElementById('HiddenField1');
    if(ddl.options[ddl.selectedIndex].value=="1")
     {   //var check=confirm('Are You Sure?');    
            if(confirm('Are You Sure?'))
             {   
                //document.getElementById('TextBox1').value='1';       
                hiddenField.value = '1';
                return true;
            }
            else
            {
                hiddenField.value = '0';
                return false;
            }

    }
  }

在此先谢谢您.

Thanks in advance.

推荐答案

进行如下所示的更改

Do Changes like below

var hiddenField = document.getElementById('<% = HiddenField1.ClientID %>');

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