我有一个带有隔离范围的指令，其值与双向绑定到父范围。我正在调用一个方法来更改父范围中的值，但更改不会在我的指令中应用(双向绑定不被触发)。这个问题非常相似：
@H_404_20@AngularJS: Parent scope not updated in directive (with isolated scope) two way binding
但是我没有改变该指令的值，而是仅在父范围内进行更改。我阅读了解决方案，并在第五点说：
The watch() created by the isolated scope checks whether it's value for the bi-directional binding is in sync with the parent's value. If it isn't the parent's value is copied to the isolated scope.
这意味着当我的父值更改为2时，会触发手表。它检查父值和指令值是否相同 – 如果不是，它将复制到指令值。好的，但是我的指令值仍然是1 …我失踪了什么？
html：
<div data-ng-app="testApp">
<div data-ng-controller="testCtrl">
<strong>{{myValue}}</strong>
<span data-test-directive data-parent-item="myValue"
data-parent-update="update()"></span>
</div>
</div>
JS：
var testApp = angular.module('testApp',[]);
testApp.directive('testDirective',function ($timeout) {
return {
scope: {
key: '=parentItem',parentUpdate: '&'
},replace: true,template:
'<button data-ng-click="lock()">Lock</button>' +
'</div>',controller: function ($scope,$element,$attrs) {
$scope.lock = function () {
console.log('directive :',$scope.key);
$scope.parentUpdate();
//$timeout($scope.parentUpdate); // would work.
// expecting the value to be 2,but it is 1
console.log('directive :',$scope.key);
};
}
};
});
testApp.controller('testCtrl',function ($scope) {
$scope.myValue = '1';
$scope.update = function () {
// Expecting local variable k,or $scope.pkey to have been
// updated by calls in the directive's scope.
console.log('CTRL:',$scope.myValue);
$scope.myValue = "2";
console.log('CTRL:',$scope.myValue);
};
});
