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AngularJS custom form component / directive using ng-model

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猫巷女王i
猫巷女王i 2020-11-30 15:33

Angular custom form component / directive and $dirty property

When using regular input, such as
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  • 误落风尘
    2020-11-30 16:05

    Implementing custom form controls (using ngModel)

    Use the ngModel controller and the object form of the require property in the DDO:

    angular.module('myModule', [])
.directive('myDirective', function() {
  return {
    restrict: 'E',
    require: { ngModelCtrl: 'ngModel' },
    scope: {
      ngModel: '<'
    },
    bindToController: true,
    controllerAs: '$ctrl',
    template: 
       `<div>
          <button ng-click="$ctrl.ngModelCtrl.$setViewValue('foo')">
              Set foo
          </button>
          <button ng-click="$ctrl.ngModelCtrl.$setViewValue('bar')">
              Set bar
          </button>
       </div>`,
    controller: function ctrl() {}
  };
});

    Usage:

    <form name="myForm">
    <input type="text" ng-model="foobar">
    <my-directive ng-model="foobar"></my-directive>
</form>

    By instantiating and using the ng-model controller, the directive will automatically set the form controls as necessary.

    The DEMO

    angular.module('myModule', [])
.directive('myDirective', function() {
  return {
    restrict: 'E',
    require: { ngModelCtrl: 'ngModel' },
    scope: {
      ngModel: '<'
    },
    bindToController: true,
    controllerAs: '$ctrl',
    template: 
       `<div>
          <button ng-click="$ctrl.ngModelCtrl.$setViewValue('foo')">
              Set foo
          </button>
          <button ng-click="$ctrl.ngModelCtrl.$setViewValue('bar')">
              Set bar
          </button>
       </div>`,
    controller: function ctrl() {}
  };
});
    <script src="//unpkg.com/angular/angular.js"></script>
  <body ng-app="myModule">
    <h2>ngModel DEMO</h2>
    <form name="myForm">
        <input type="text" ng-model="foobar">
        <my-directive ng-model="foobar"></my-directive>
    </form>
    <br>myForm.$dirty = {{myForm.$dirty}}
    <br>myForm.$pristine = {{myForm.$pristine}}
    <br><button ng-click="myForm.$setDirty()">Set dirty</button>
    <br><button ng-click="myForm.$setPristine()">Set pristine</button>
  </body>

    I recommend isolate scope with ngModel as an input. Output should be done with the $setViewValue method.

    For more information, see

    • AngularJS Developer Guide - Implementing custom form controls (using ngModel)

    • AngularJS Developer Guide - Component-based application architecture

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