问题
Angular ng-change on ng-model passed into child directive
Basically, I want to be able to pass in ng-model from a parent directive to a child directive. I could just in a 2-way binded value, but then I wouldn't be able to use a ng-change in the parent directive on the child element. I could also use ng-click, but this wouldn't work with a non-clicking change (such as a text area instead of a checkbox). So I'm wondering if there's a way to allow a custom directives to have a ng-model/ng-change pair similar to how inputs, buttons, text areas and other html elements can. I want to avoid using emits, ons, watches, passing callbacks, etc. I just want to be able to do [input type="checkbox" ng-model="ngModel"] on a custom directive instead of input.
Parent Template
<child ng-model="x" ng-change="x()"></toggle>
Parent Directive
$scope.x = function() {console.log('hi')};
Child Template
<div>
<input type="checkbox" ng-model="ngModel">
</div>
Child Directive ??
$scope.ngModel = $element.controller('ngModel');
My angular version is 1.4.8 btw.
Thanks :)
回答1:
Almost the same as @georgeawg answer, but using directive method (since component was introduced in 1.5+, but author has 1.4.8):
angular.module('myApp', [])
.controller('MyCtrl', ['$scope', function MyCtrl($scope) {
}])
.directive('inputComponent', [function () {
var myDirective = {
restrict: 'E',
require: 'ngModel',
templateUrl: "checkboxComponent.html",
link : function(scope, element, attrs, ngModelCtrl){
scope.updateModel = function(ngModel) {
ngModelCtrl.$setViewValue(ngModel);
}
}
}
return myDirective;
}]);
fieldset {
margin-top: 1em;
}
<script src="//code.angularjs.org/1.4.8/angular.js"></script>
<div ng-app="myApp">
<div ng-controller="MyCtrl">
<input-component ng-model="value"
ng-change="value2=value"></input-component>
<fieldset>
<p>value = {{value}}</p>
<p>value2 = {{value2}}</p>
</fieldset>
</div>
<script type="text/ng-template" id="checkboxComponent.html">
<div>
<input type="text" ng-model="ngModel" ng-change="updateModel(ngModel)" />
</div>
</script>
</div>
回答2:
How to add ng-model
functionality to a component
Use one-way <
input for input and use the ngModelController API for output:
app.component("checkboxComponent", {
bindings: { ngModel: '<' },
require: { ngModelCtrl: 'ngModel' },
template: `
<input type=checkbox ng-model='$ctrl.ngModel'
ng-change="$ctrl.ngModelChange()" />
`,
controller: function() {
this.ngModelChange = () => {
this.ngModelCtrl.$setViewValue(this.ngModel);
};
}
})
The component uses one-way binding for input, and $setViewValue
for output.
With this method, the ng-change
works, and the component can be used as a form element:
<form name="form1">
<checkbox-component name="input1" ng-model="vm.formData.input1"
ng-change="vm.inp1Change()">
</checkbox-component>
</form>
For more information, see
- AngularJS ngModelController API Reference
- AngularJS Developer Guide -Implementing custom form controls (using ngModel)
The DEMO
angular.module("app",[])
.component("checkboxComponent", {
bindings: { ngModel: '<' },
require: { ngModelCtrl: 'ngModel' },
template: `
<fieldset>
<h3>Checkbox Component</h3>
<input type=checkbox ng-model='$ctrl.ngModel'
ng-change="$ctrl.ngModelChange()" />
Checkbox
</fieldset>
`,
controller: function() {
this.ngModelChange = () => {
this.ngModelCtrl.$setViewValue(this.ngModel);
};
}
})
<script src="//unpkg.com/angular/angular.js"></script>
<body ng-app="app">
<checkbox-component ng-model="value"
ng-change="value2=value">
</checkbox-component>
<fieldset>
<p>value = {{value}}</p>
<p>value2 = {{value2}}</p>
</fieldset>
</body>
来源:https://stackoverflow.com/questions/44594532/how-to-add-ng-model-functionality-to-a-component