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ASP.NET Highlight Required Fields Border

In ASP.NET, highlight require fields, check each control for require input and Page_Validators's isValid property in Javascript function on submit button click. The RequiredFieldValidator control belongs to System.Web.UI.WebControls

Syntax

function check() {
for (var i = 0; i < Page_Validators.length; i++) {
	if (!Page_Validators[i].isvalid || 
	document.getElementById(Page_Validators[i].controltovalidate).value == '') {
		document.getElementById(Page_Validators[i].controltovalidate).style.border 
		= '1px solid red';
	}
	else {
		document.getElementById(Page_Validators[i].controltovalidate).style.border 
		= '1px solid #333';
	}
}
}

ASP.NET RequiredFieldValidator Control Property

PropertyDescription
ControlToValidateSpecifies control name which needs to be validate.
DisplaySpecifies behavior of the error message.
EnableClientScriptSpecifies whether or not client-side validation is enabled.
EnabledSpecifies whether or not validation control is enabled or not.
ErrorMessageSpecifies error messageto be display in validation summary.
ForeColorSpecifies error message color.
IsValidIndicate if associate control passes validation or not.
SetFocusOnErrorSet focus on associate control if validation fails.
TextSpecifies text to be display if validation fails.
ValidationGroupSpecifies validation group name.
ValidateUpdate the isvalid propery.
ValidateGetValidationPropertyDetermineing validation property of a control, if it exists.
InitialValueSpecifies initial value of input control.

ASP.NET Highlight Required Fields Border Example

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" 
Inherits="_Default" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>ASP.NET Highlight require field using Javascript Example</title>
<script type="text/javascript">
function check() {
for (var i = 0; i < Page_Validators.length; i++) {
	if (!Page_Validators[i].isvalid 
	|| document.getElementById(Page_Validators[i].controltovalidate).value == '') {
		document.getElementById(Page_Validators[i].controltovalidate).style.border 
		= '1px solid red';
	}
	else {
		document.getElementById(Page_Validators[i].controltovalidate).style.border 
		= '1px solid #333';
	}
}
}
  </script>
</head>
<body>
<form id="Form" runat="server">
<div style="width: 619px">
<asp:Label ID="lblTitle" runat="server" Font-Bold="True" Font-Size="Medium" 
Font-Underline="True" Text="ASP.NET Highlight require field using Javascript Example"></asp:Label>
<br /><br />
<table border="0" width="500px" cellpadding="0" cellspacing="5">
<tr><td>    
<asp:Label ID="lblName" runat="server" Font-Bold="True" Font-Size="Small"   
    Text="User name:"></asp:Label>
    </td><td>
<asp:TextBox ID="txtName" runat="server" Height="22px" Width="175px" CssClass="highlight"></asp:TextBox>
<asp:RequiredFieldValidator ID="rfvName" runat="server" ErrorMessage=""  
    ControlToValidate="txtName" CssClass="highlight">
    </asp:RequiredFieldValidator>
</td></tr>
<tr><td>
<asp:Label ID="lblPassword" runat="server" Font-Bold="True" Font-Size="Small"   
    Text="Password:"></asp:Label> 
</td><td>
<asp:TextBox ID="txtPassword" runat="server" Height="22px" TextMode="Password"   
    Width="175px" CssClass="highlight"></asp:TextBox>
<asp:RequiredFieldValidator ID="rfvPassword" runat="server" ErrorMessage=""   
    ControlToValidate="txtPassword"
    ></asp:RequiredFieldValidator> 
</td></tr>

<tr><td colspan="2">
<asp:Button ID="btnDisabledValidation" runat="server" Font-Bold="True" Text="Validate"
Font-Size="Small" CausesValidation="true" OnClientClick="check();" />
</td></tr>
</table>   
</div> 
</form>
</body>
</html>

Above example will produce following output

RequiredFieldValidator

RegularExpressionValidator

RangValidator

CompareValidator

CustomValidator

ValidationSummary