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Angular Custom Form Validation

In some cases basic validation is not enough. Angular support custom validation adding validator functions to the $validators object on the ngModelController:

angular.module('app', [])
 .directive('myValidator', function() {
 return {
 // element must have ng-model attribute
 // or $validators does not work
 require: 'ngModel',
 link: function(scope, elm, attrs, ctrl) {
 ctrl.$validators.myValidator = function(modelValue, viewValue) {
 // validate viewValue with your custom logic
 var valid = (viewValue && viewValue.length > 0) || false;
 return valid;

The validator is defined as a directive that require ngModel, so to apply the validator just add the custom directive to the input form control.

<form name="form">
 <input type="text"
 <pre ng-bind="'my-validator returned: ' + form.model.$valid"></pre>


In this page (written and validated by ) you learned about AngularJS Custom Form Validation . What's Next? If you are interested in completing AngularJS tutorial, your next topic will be learning about: AngularJS Async validators.

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