how do use On text change of textbox property

Question

4.00/5 (1 vote)

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i have following code that work fine in button click method.

ASP.NET

<asp:TextBox CssClass="form-control" runat="server" MaxLength="7" ID="txtRollNo" />
                    <asp:RegularExpressionValidator Display="Dynamic" ValidationGroup="vgEmployee" runat="server" ID="revRollNo" ControlToValidate="txtRollNo" Requried="required" ValidationExpression="^[A-Za-z0-9,/\,-]+$" ErrorMessage="Number,Alpha,- and / only" ></asp:RegularExpressionValidator>
                     <asp:Button CssClass="btn btn-green btn-block " ID="btn_Click"  Width="150" runat="server" OnClick="btn_Click_Click" CausesValidation="True" Text="Check Employee"/>

Code Behind is

C#

protected void btn_Click_Click(object sender, EventArgs e)
       {
           if (!string.IsNullOrEmpty(txtRollNo.Text))
           {
               var employee = _service.GetEmployee(txtRollNo.Text);
               if (employee != null)
               {
                   MsgLitteral.ShowNotificationInline("Record Found", true);
               }
               else
               {
                   MsgLitteral.ShowNotificationInline("Record not Found", false);
               }
           }
       }

i want to change it as when roll no is entered by user and move to next field message is dosplayed,weather it is in database or not

Posted 28-Oct-14 20:34pm

Sajid227

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Mathew Soji · Accepted Answer · 2014-10-28T20:52:00

Try adding text box changed event with setting AutoPostBack="True" for the text box control.

<asp:TextBox CssClass="form-control" runat="server" MaxLength="7" ID="txtRollNo" OnTextChanged="txtRollNo_TextChanged" AutoPostBack="True"  />

C#

protected void txtRollNo_TextChanged(object sender, EventArgs e)
      {
          var employee = _service.GetEmployee(txtRollNo.Text);
          if (employee != null)
          {
            MsgLitteral.ShowNotificationInline("Record Found", true);
          }
          else
          {
             MsgLitteral.ShowNotificationInline("Record not Found", false);
          }
      }

  }