Why The error message for custom validator is not shown in message box?
I have tried in many way but the error message for custom validator is not shown in validation summary but it(ValidationSummary) shows error message for every other type of validator.
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Expt_Custom Validator.aspx.cs" Inherits="Expt_Custom_Validator" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Untitled Page</title>
<script runat="server">
protected void CustomValidator1_ServerValidate(object source, ServerValidateEventArgs args)
{
if (args.Value.Equals("J开发者_Go百科agdeep"))
args.IsValid = false;
else
args.IsValid = true;
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label ID="lblName" runat="server" Text="Enter Your Name"></asp:Label>
<asp:TextBox ID="txtbxName" runat="server"></asp:TextBox>
<asp:CustomValidator ID="CustomValidator1" runat="server"
ErrorMessage="You are Not allowed" Display="None"
onservervalidate="CustomValidator1_ServerValidate"></asp:CustomValidator>
<br />
<asp:Label ID="lblClass" runat="server" Text="Class"></asp:Label>
<asp:TextBox ID="txtClass" runat="server"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server"
ErrorMessage="Please enter Clas" ControlToValidate="txtClass" Display="None"></asp:RequiredFieldValidator>
<br />
<asp:ValidationSummary ID="ValidationSummary1" runat="server" />
<br />
<asp:Button ID="Button1" runat="server" Text="Validate" />
</div>
</form>
</body>
</html>
Custom Validator, when placing in formview will not show its error message after server-side validation (though it has been validated and result is invalid) the mean to fix this in to wrap it by a Update Panel.
I solved this issue by registering a client script block, which updates the validation summary content. I have used jQuery for this:
private void DisplayCustomValidationMessage(CustomValidator cv, ValidationSummary vs)
{
if ((cv == null) || (vs == null)) return;
Type csType = this.GetType();
if (ClientScript.IsClientScriptBlockRegistered(csType, cv.ID)) return;
StringBuilder sb = new StringBuilder(@"<script type='text/javascript'>");
sb.Append(@"$(function () {");
sb.Append(@"var $vs = $('#" + vs.ClientID + "');");
sb.Append(@"if($vs.find('ul').length){");
sb.Append(@"$vs.find('ul').append('<li>" + cv.ErrorMessage + "</li>');");
sb.Append(@"}else{");
sb.Append(@"$vs.html('Fehlerhafte Eingabe(n):<ul><li>" + cv.ErrorMessage + "</li></ul>'); }");
sb.Append(@"$vs.css('display', 'block');");
sb.Append(@"});");
sb.Append(@"</script>");
ClientScript.RegisterClientScriptBlock(csType, cv.ID, sb.ToString());
}
The method has to be called if validation fails:
protected void cvYourCustomValidator_ServerValidate(object source, ServerValidateEventArgs args)
{
args.IsValid = YourCustomValidationMethod();
if (!args.IsValid)
{
DisplayCustomValidationMessage((CustomValidator) source, vsYourValidationSummaryControl);
}
}
加载中,请稍侯......
精彩评论