Asp.net不从c＃变量中的JavaScript函数创建值 [英] Asp.net Not geting value from javascript function in c# variable

问题描述

这个问题浪费了我很多时间。我已经写了一个JavaScript函数并为asp隐藏字段赋值，但是当我运行我的应用程序时，我没有在c＃变量
中获取值，如果我缺少某些东西，请纠正我。
提前致谢。
这里是我的代码
javascript函数：

$ p $函数sureDelete（）{
if（ confirm（DELETE USER？）== true）{
document.getElementById（hidden_​​yesno）。setAttribute（Value，1）;
//document.getElementById('deleteYesNo').value = 1;
} else {
document.getElementById（hidden_​​yesno）。setAttribute（Value，0）;
//document.getElementById('deleteYesNo').value = 0;
}
返回true;
}

我的隐藏字段和点击事件

 < asp：HiddenField ID =hidden_​​yesnorunat =server/> 
< asp：ImageButton runat =serverCssClass =pt-userDeactive helpCommandName =deleteuser
 CommandArgument ='<％＃Eval（user_id）％>'ImageUrl = ../TemplateS/assets/images/delete.png
 Width =25pxHeight =25pxOnClick =Unnamed_ClickOnClientClick =return sureDelete（）/> 
  

以下是c＃代码

  protected void Unnamed_Click（object sender，ImageClickEventArgs e）{
 string flag = hidden_​​yesno.Value.ToString（）; 
 //这里我得到的值是：
 if（flag ==1）{
 //做某事
} else {
 / / do nothing 
} 
} 
  

解决方案

您正在使用 asp：HiddenFeild ，其中 ID 由 asp.net 根据 ContentPlaceHolder ，所以它不会被javascript / jquery找到。

ID 隐藏域，或者您可以设置 ClientIDMode =static这将确保 ID 没有改变。

 < asp：HiddenField ID =hidden_​​yesnorunat =server ClientIDMode =Static/> 
  

this problem has wasted much of my time. I have written a javascript function and assigned value to asp hidden field but when i run my application i am not getting the value in c# variable please correct me if i am missing something. thanks in advance. here is my code javascript function:

function sureDelete() {
            if (confirm("DELETE USER?") == true) {              
                document.getElementById("hidden_yesno").setAttribute("Value", "1");
              //document.getElementById('deleteYesNo').value = 1;
            } else {                         
                document.getElementById("hidden_yesno").setAttribute("Value", "0");
               //document.getElementById('deleteYesNo').value = 0;
            }
            return true;
        }

my hidden field and click event

<asp:HiddenField ID="hidden_yesno" runat="server" />
<asp:ImageButton  runat="server" CssClass="pt-userDeactive help" CommandName="deleteuser"
CommandArgument='<%# Eval("user_id") %>' ImageUrl ="../TemplateS/assets/images/delete.png"
Width="25px" Height="25px" OnClick="Unnamed_Click" OnClientClick="return sureDelete()"/>

and following is the c# code

 protected void Unnamed_Click(object sender, ImageClickEventArgs e) {
            string flag = hidden_yesno.Value.ToString();
              //here i am getting the value as: ""            
            if (flag == "1") {
               //do something
            } else {
                //do nothing
            }          
        }

解决方案

You are using asp:HiddenFeild whose ID is changed by asp.net according to ContentPlaceHolder so it is not found by javascript/jquery.

Either you need exact ID of hidden feild or you can set ClientIDMode="static" which will make sure that ID is not changed.

<asp:HiddenField ID="hidden_yesno" runat="server" ClientIDMode="Static" />

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