Need help in custom validation using javascript in ASP.NET

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Create a webpage with different text boxes. The webpage must provide the following functionality using JavaScript to make validation controls:

o text box to enter FROM city o text box to enter TO city, verify that the FROM and TO cities are different.

o text box to enter DEPARTURE DATE, verify that the departure date is after today

text box to enter RETURN DATE, verify that the return date is after departure date

QUESTION: How can I use JavaScript to perform the validations and show an error message if the validation fails as above?

What I have tried:

This is my code so far:

JS:

function validateCity(source, args) {
	var fromCity = document.getElementById("txtFromCity").value;
	var toCity = document.getElementById("txtToCity").value;
	
	if (fromCity == toCity) {
		 args.IsValid = false;
	} else {
		return args.IsValid = true;
	}
}

ASP.NET:

<table id="roundTrip" style="display:none;">
				<tr>
					<td>
						<asp:Label ID="Label4" runat="server" Text="From"></asp:Label>
					</td>
					<td>
						<asp:TextBox ID="txtFromCity" runat="server" Text=""></asp:TextBox>
					</td>
				</tr>
				<tr>
					<td>
						<asp:Label ID="Label5" runat="server" Text="To"></asp:Label>
					</td>
					<td>
						<asp:TextBox ID="txtToCity" runat="server" Text=""></asp:TextBox>
						<asp:CustomValidator ID="custToCity" runat="server" 
							ControlToValidate="txtToCity" 
							ErrorMessage="Not Same" 
							Display="Dynamic" 
							ClientValidationFunction="validateCity" /> 
					</td>
				</tr>
				<tr>
					<td>
						<asp:Label ID="Label6" runat="server" Text="Depart Date"></asp:Label>
					</td>
					<td>
						<asp:TextBox ID="TextBox6" runat="server" Text=""></asp:TextBox>
					</td>
				</tr>
				<tr>
					<td>
						<asp:Label ID="Label7" runat="server" Text="Return Date"></asp:Label>
					</td>
					<td>
						<asp:TextBox ID="TextBox7" runat="server" Text=""></asp:TextBox>
					</td>
				</tr>
				</table>

Posted 2-May-19 0:24am

Member 14186004

Updated 2-May-19 2:59am

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F-ES Sitecore · Answer 1 · 2019-05-02T03:00:00

Solution 2

CustomValidator.ClientValidationFunction Property (System.Web.UI.WebControls) | Microsoft Docs[^]

Posted 2-May-19 3:00am

F-ES Sitecore

Divya Srivastava · Answer 2 · 2019-05-02T02:04:00

From and To Date Validation

For validating the date use pop up calendar. So the User can easily select the date from calendar.

Steps of using popup calendar

Step 1 First Register Popup Calender on the top of of your aspx page.

<%@ Register Assembly="RJS.Web.WebControl.PopCalendar.Net.2008" Namespace="RJS.Web.WebControl"
    TagPrefix="rjs" %>

Step 2 Use Calendar with your date text boxes.

C#

 <tr>
   <td><asp:Label ID="Label6" runat="server" Text="Depart Date"</asp:Label></td>
   <td><asp:TextBox ID="TextBox6" runat="server" Text=""></asp:TextBox>
   <div style="margin-left: 130px; margin-top: -21px;">
     <rjs:PopCalendar ID="calDepartureDateFrom" runat="server" Control="TextBox6"
     From-Date="1950-01-01" Separator="/" Format="dd mm yyyy" 
     ShowErrorMessage="false" />
   </div>
</td>
 </tr>

 <tr>
  <td><asp:Label ID="Label7" runat="server" Text="Return Date"></asp:Label></td>
  <td><asp:TextBox ID="TextBox7" runat="server" Text=""></asp:TextBox>
   <div style="margin-left: 130px; margin-top: -21px;">
    <rjs:PopCalendar ID="calReturnDateTo" runat="server" 
     Control="TextBox7" From-Date="" Separator="/" Format="dd mm yyyy" 
     ShowErrorMessage="false" From-Control="TextBox6" />
    </div>
  </td>
 </tr>

Step 3 Set Departure Calendar Start Date to after Today(dissabling past dates). The Date can be set on the cs(Code behind) page on page load event.

C#

protected void Page_Load(object sender, EventArgs e)  
{
   calDepartureDateFrom.StartDate = DateTime.Now+1; //dissabling past dates
}