AngularJS supports asynchronous validation on blur

Using Angular JS version 1.5.6, I am looking to implement asynchronous input validation that occurs only on blur. However, I am unable to use modelOption: {debounce: 500} or modelOption: {updateOn: 'blur'} due to the directive being used with other directives.

I attempted the code below, but encountered a situation where no async validation is performed on the first blur, and subsequently, every typed character triggers the async validation, which is not the intended behavior.

function blurFocusDirective($http, $q) {
return {
  require: 'ngModel',
  link: function(scope, elm, attrs, modelCtrl) {
    elm.on('blur', function() {
      console.log('capture blur event');

      modelCtrl.$asyncValidators.myValidator = function(modelValue, viewValue) {
        return $http.get('/username-check/' + modelValue).then(
          function(response) {
            if (!response.data.validUsername) {
              return $q.reject(response.data.errorMessage);
            }
            return true;
          }
        );
      };
    });
  }
};

}

To observe the issue in action, you can check the following Plunker link. Press F12 to view the console log for more insights.

Note that the endpoint '/username-check/' is fictional and unrelated to the actual issue at hand. The problem lies in the fact that the async HTTP request fires on each typed character instead of just during blur.

Answer №1

If your code is experiencing an issue, it may be related to the onblur event triggering a new async validator every time there is a change in the ngModel. To address this, you can manually set the validation as shown below:

elm.on('blur', function() {
      console.log('capture blur event');

      $http.get('/username-check/' + modelCtrl.$modelValue).then(
        function(response) {
          if (response.data.validUsername)
            modelCtrl.$setValidity("myValidation",true);
          else
            modelCtrl.$setValidity("myValidation",false);
        }
      ).catch(function() {
        modelCtrl.$setValidity("myValidation",false);
      });

    });

Feel free to check out an example on Plunker

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