date field show error message

[Community Alums]

There is a "Date" field that is visible based on another field called "Request," which has three choices.

I need to implement validation on the Date field:

if a past date (earlier than today) is selected, an error message should appear, and the date field should be cleared. Additionally,

if the Request choice is changed, I do not want the previous error message to be displayed. However, after selecting a new date, if it is a past date, the error message should reappear.

[OlaN]

Hi,

A simple UI policy with UI policy actions can resolve this requirement.

Mark Roethof has written a good article about it here.

[HIROSHI SATOH]

If you implement it in a client script:
※Replace "u_request_date" and "u_request_string" with the actual field names.

The onChang script of "request"

function onChange(control, oldValue, newValue, isLoading, isTemplate) {
   if (isLoading || newValue === '') {
      return;
   }

   //Type appropriate comment here, and begin script below
    var dateField = g_form.getValue('u_request_date');  // Replace 'your_date_field' with your actual Date field name

	var today_date = new Date();
	var today_date_str = formatDate(today_date, g_user_date_format);    

    // Check if the date is a past date
    if (dateField && new Date(dateField) < new Date(today_date_str)) {
        g_form.clearValue('u_request_date');
        g_form.showErrorBox('u_request_date', 'Please select a future date.');
    } else {
        g_form.hideErrorBox('u_request_date');
    }   
   
}

The onChang script of "date"

function onChange(control, oldValue, newValue, isLoading, isTemplate) {
   if (isLoading || newValue === '') {
      return;
   }

   //Type appropriate comment here, and begin script below
    g_form.hideErrorBox('u_request_date');
   
}

[Harish Bainsla]

Hi @Community Alums  you can achieve through Ui policy for reference check below link

https://www.servicenow.com/community/developer-articles/no-code-date-validations-through-catalog-ui-policies/ta-p/2297600