What is the best way to implement validation for ngModelCtrl based on user input within a directive?

I have created a unique directive and I am looking to incorporate the validators from an input field used within this directive template. Is there a way to expand ngModelCtrl validators with the input validators?

This is my custom directive implementation:

angular.module('myModule')
  .directive('myUrl', function() {
    return {
      restrict: 'A',
      require: ['ngModel', '^form'],
      replace: true,
      templateUrl: '/components/url/my-url.html',
      scope: {},
      link: function(scope, element, attrs, ctrls) {
        var ngModelCtrl = ctrls[0];
        var formCtrl = ctrls[1];
        scope.formField = ngModelCtrl;

        // Scope data vars
        scope.url = '';

        // Watchers
        scope.$watch('url', function(newValue) {
          ngModelCtrl.$setViewValue(newValue);
        });

        // Validators
        var inputValidators = formCtrl['my-url'].$validators;
        ngModelCtrl.$validators = angular.copy(inputValidators);

        // Custom render
        ngModelCtrl.$render = customRender;

        function customRender() {
          scope.url = ngModelCtrl.$viewValue;
        }
      }
    }
  });

This is how it looks in my view:

<div>
      <label>My URL</label>\
      <input type="url" name="my-url" placeholder="http://" ng-model="url">
      <div ng-messages="formField.$error" ng-show="formField.$invalid">
        <span ng-message="url">Invalid URL.</span>
      </div>
&lt;/div>

If you want to see a live example of the issue I'm facing, check out this fiddle link: https://jsfiddle.net/bsmaniotto/gzLmy1op/

Thank you for your help.

UPDATE:

Upon further analysis, it appears that the challenge does not lie in binding the validators of the input[url] to my custom directive's ngModelCtrl validators. It seems that when an invalid input is entered in the input[url] element, the $modelValue is not being set. As a result, my custom directive treats it as if nothing has been entered.

Answer №1

When working with Angular, implementing input validation can be a straightforward task when utilizing a controller. Simply include the following code:

ui-event: {keyup: 'controller.validationFunctionName(whatever)'}

Replace 'whatever' with the content of your input field, and each time a key is released, your validation function will be triggered.

To show an error message below the input field, create another div with ng-if set to the result of the keyup event function.

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