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4
我一直在试图找出解决方案，但我认为我遇到了死胡同。
所以这是我的指令
directives.directive('postprocess', function($compile)
{
return {
restrict : 'E',
require: '^ngModel',
scope: {
ngModel: '='
},
link: function(scope, element, attrs) {
var parsed = scope.ngModel;
el = $compile(parsed)(scope);
element.html("");
//add some other html entities/styles.
element.append(el);
console.log(parsed);
}
};
});
<postprocess ng-model="some_model.its_property" style="padding-top: 10px;" />
some_model.its_property = 'Holla';
最佳答案
它要简单得多，因此我删除了您在那里的一些额外代码。
请查看下面的代码或工作 Plunker :
<!doctype html>
<html lang="en" ng-app="myApp">
<head>
<meta charset="UTF-8">
<title>Document</title>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.0.8/angular.min.js"></script>
<script>
var myApp = angular.module('myApp', []);
myApp.directive('postprocess', function ($timeout) {
return {
restrict : 'E',
transclude: 'true',
scope: {
myVariable: '='
},
link: function(scope, element, attrs) {
$timeout(function () {
scope.myVariable = 'Bye bye!'
}, 200);
}
};
});
myApp.controller('myAppCtrl', ['$scope', '$timeout', function ($scope, $timeout) {
$scope.myVariable = {
value : 'Holla'
};
console.log($scope.myVariable.value); // -> prints initial value
$timeout(function () {
console.log($scope.myVariable.value); // -> prints value after it is changed by the directive
}, 2000);
}])
</script>
</head>
<body ng-controller="myAppCtrl">
<postprocess my-variable="myVariable.value" style="padding-top: 10px;" />
</body>
</html>
my-variable 接收该值。属性 scope.myVariable 所做的任何更改更新 $scope.myVariable主 Controller $scope.myVariable更改为“再见”Angular's two-way data binding is the root of all awesome in Angular. However, it's not magic, and there are some situations where you need to give it a nudge in the right direction.
When you bind a value to an element in Angular using ng-model, ng-repeat, etc., Angular creates a $watch on that value. Then whenever a value on a scope changes, all $watches observing that element are executed, and everything updates.
Sometimes, usually when you're writing a custom directive, you will have to define your own $watch on a scope value to make the directive react to changes.
On the flip side, sometimes you change a scope value in some code but the app doesn't react to it. Angular checks for scope variable changes after pieces of your code have finished running; for example, when ng-click calls a function on your scope, Angular will check for changes and react. However, some code is outside of Angular and you'll have to call scope.$apply() yourself to trigger the update. This is most commonly seen in event handlers in custom directives.
关于angularjs-directive - 两种方式绑定(bind)Angularjs指令不起作用，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/19121876/
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4
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