Rus*_*nas 4 javascript angularjs
我有AngularJS应用程序(见下文),它使用指令从外部库创建自定义块.我想Building.destroyBlock()在块被加载时调用(不是所有块都需要).我在考虑$scope.$watch().是否有更好的方式ng-destroy或什么？
var app = angular.module('app', []);
app.controller('MainCtrl', function($scope) {
$scope.blocks = [
{name: 'item #1', id: 1},
{name: 'item #2', id: 2}
];
}).directive('externalBlock', function() {
return {
restrict: 'A',
scope: {
block: '=data'
},
link: function(scope, elm, attrs) {
Building.addBlock(elm[0], scope.block);
}
}
});<script src="https://code.angularjs.org/1.4.0-rc.2/angular.js"></script>
<script>
// this comes from external library
var Building = {
blocks: [],
addBlock: function(elm, block) {
elm.innerHTML = block.name + ' [ready]';
this.blocks[block.id] = block;
},
destroyBlock: function(id) {
delete this.blocks[id];
}
}
</script>
<body ng-controller="MainCtrl" ng-app="app">
<div ng-repeat="block in blocks" external-block data="block"></div>
<!-- need to destroy unused block when this button is clicked -->
<button ng-click="blocks = [{name: 'item #3', id: 3}]">Rebuild</button>
</body>我怀疑范围$destroy事件是你所追求的.
link: function(scope, elm, attrs) {
Building.addBlock(elm[0], scope.block);
scope.$on('$destroy', function() {
Building.destroyBlock(scope.block.id);
});
}
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