https://www.hrdf.org.sa/js/custom-validation.js

1try {
2    document.addEventListener("DOMContentLoaded", function () {
3        $.validator.addMethod("requiredifselected", function (value, element, parameters) {
4            var dependentProperty = $('#' + parameters['dependentproperty']);
5            var targetValues = parameters['targetvalues'].split(',');
6            if (dependentProperty.length && targetValues.includes(dependentProperty.val())) {
7                return $.trim(value) !== '';
8            }
9            return true;
10        });
11
12        $.validator.unobtrusive.adapters.add('requiredifselected', ['dependentproperty', 'targetvalues'], function (options) {
13            options.rules['requiredifselected'] = {
14                dependentproperty: options.params.dependentproperty,
15                targetvalues: options.params.targetvalues
16            };
17            options.messages['requiredifselected'] = options.message;
18        });
19    });
20}
21catch (error) { console.log(error) }