How to: Validate a Particular Editor

• Aug 01, 2019

To validate a particular editor you can use one of the following ways.

• Set the ValidationSettings.ValidateOnLeave property to true (the default value) to automatically validate an editor after its value has been changed.

• Call the editor’s client-side ASPxClientEdit.Validate method.

  The code sample below demonstrates validating a single editor via a script.

  ASPX

  <dx:ASPxLabel ID="lbl" runat="server" Text="E-mail:">
  </dx:ASPxLabel>
  <dx:ASPxTextBox ID="ASPxTextBox1" runat="server" Width="170px" ClientInstanceName="tbEmail">
       <ValidationSettings ValidateOnLeave="False">
            <RequiredField ErrorText="E-mail is required" IsRequired="True" />
       </ValidationSettings>
  </dx:ASPxTextBox>
  <dx:ASPxButton ID="btn" runat="server" Text="Submit" AutoPostBack="False" CausesValidation="False">
       <ClientSideEvents Click="function(s, e) {
            tbEmail.Validate();
       }" />
  </dx:ASPxButton>
  

• Call the editor’s server-side ASPxEdit.Validate method.

  ASPX

  <dx:ASPxLabel ID="lbl" runat="server" Text="E-mail:">
  </dx:ASPxLabel>
  <dx:ASPxTextBox ID="ASPxTextBox1" runat="server" Width="170px">
       <ValidationSettings ValidateOnLeave="False">
            <RequiredField ErrorText="E-mail is required" IsRequired="True" />
       </ValidationSettings>
  </dx:ASPxTextBox>
  <dx:ASPxButton ID="btn" runat="server" Text="Submit" onclick="btn_Click" CausesValidation="False">
  </dx:ASPxButton>
  

  C#

  protected void btn_Click(object sender, EventArgs e) {
       ASPxTextBox1.Validate();
  }
  

  VB.NET

  Protected Sub btn_Click(ByVal sender As Object, ByVal e As EventArgs)
       ASPxTextBox1.Validate()
  End Sub