我在组合框中有两个项目，因此我希望用户在单击“提交"之前必须选择项目. [英] i have two items in the ComboBox so i want the user to be compulsary to choose item before he/she click Submit.

问题描述

我在组合框中有两个项目，因此我希望用户在单击提交"之前必须先选择项目.

i have two items in the ComboBox so i want the user to be compulsary to choose item before he/she click Submit.

推荐答案

请参考相同的内容已经问过的问题:-

我想让一个用户与在C#中的ComboBox上进行比较 [

Please refer to the same question already asked:-

i want to make a user to be comparsary to selet on the ComboBox in c#[^]

OnClientClick =" javascript:return ValidateSaveRegion()

这是您的提交按钮中validateSaveRegion()上方的javascript调用，并将其以aspx格式编写在下面的代码中，可以正常工作...尝试

OnClientClick="javascript:return ValidateSaveRegion()

this is javascript call above validateSaveRegion()in your submit button and write this below code in aspx it wil work...try

function ValidateSaveRegion() {
  var Name = document.getElementById(cntPlcHolder_CmboxName;);
          
           if (Name.value == "";) {
               alert(Enter Name;);
               Name.focus();
               return false;
           }

if (ComboBox1.SelectedIndex!=-1)
{
//Go Further
}
else
{
MessageBox.Show("Please select");
}

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