davidisnotnull · February 2, 2022 22:21 · Feb 2, 2022
diff --git a/checkbox-validation.js b/checkbox-validation.js
@@ -0,0 +1,18 @@
+window.onload = () => {
+  /*
+      Custom jquery-validation handling for check boxes must equal true
+      Decorate C# model bool properties with
+      [Range(typeof(bool), 'true', 'true', ErrorMessage = 'Add your error message')]
+      to make their corresponding checkbox validate to 'must equal true'
+  */
+  var defaultRangeValidator = $.validator.methods.range;
+  $.validator.methods.range = function (value, element, param) {
+      if (element.type === 'checkbox') {
+          // if it's a checkbox return true if it is checked
+          return element.checked;
+      } else {
+          // otherwise run the default validation function
+          return defaultRangeValidator.call(this, value, element, param);
+      }
+  }
+};