[英]AngularJS - binding/linking two directives together
将两个指令链接/绑定在一起的首选方法是什么? 我有一个有两个指令的控制器,第一个指令是一个选择元素,选择选项后,第二个指令应该处理选定的项目值。
应用代码:
var app = angular.module('plunker', []);
app.controller('MainCtrl', function() {
var sharedData = { selectedId: '' };
var vm = this;
vm.sharedData = sharedData;
});
app.directive('directiveA', ['$compile', function($compile) {
return {
restrict: 'E',
scope: {
selectedId: '='
},
template: '<select data-ng-model="vm.sharedData.selectedId" data-ng-options="currentSelect.Id as currentSelect.Name for currentSelect in vm.sharedData.availableSelects track by currentSelect.Id"><option value="">Select option</option></select><p>Directive A, selected ID: {{vm.sharedData.selectedId}}</p>',
bindToController: true,
controllerAs: 'vm',
controller: function() {
vm = this;
vm.sharedData = {
availableSelects: [
{Id:1, Name: 'Option 1'},
{Id:2, Name: 'Option 2'},
{Id:3, Name: 'Option 3'},
{Id:4, Name: 'Option 4'}
]
}
vm.logMessage = logMessage;
function logMessage(selectedId) {
console.log('directiveA: ' + selectedId);
}
},
link: function($scope, elem, attr, ctrl) {
attr.$observe('selectedId', function(selectedId) {
ctrl.logMessage(selectedId);
});
}
};
}]);
app.directive('directiveB', ['$compile', function($compile) {
return {
restrict: 'E',
scope: {
selectedId: '='
},
template: '<p>Directive B, selected ID: {{vm.sharedData.selectedId}}</p>',
bindToController: true,
controllerAs: 'vm',
controller: function() {
vm = this;
vm.logMessage = logMessage;
function logMessage(selectedId) {
console.log('directiveB: ' + selectedId);
}
},
link: function($scope, elem, attr, ctrl) {
attr.$observe('selectedId', function(selectedId) {
ctrl.logMessage(selectedId);
});
}
};
}]);
HTML代码:
<!DOCTYPE html>
<html data-ng-app="plunker" data-ng-strict-di>
<head>
<meta charset="utf-8" />
<title>AngularJS Plunker</title>
<script>document.write('<base href="' + document.location + '" />');</script>
<link href="style.css" rel="stylesheet" />
<script data-semver="1.4.1" src="https://code.angularjs.org/1.4.1/angular.js" data-require="angular.js@1.4.x"></script>
<script src="app.js"></script>
</head>
<body ng-controller="MainCtrl as vm">
<p>MainCtrl, selected ID: {{vm.sharedData.selectedId}}</p>
<directive-a data-selected-id="vm.sharedData.selectedId"></directive-a>
<directive-b data-selected-id="vm.sharedData.selectedId"></directive-b>
</body>
</html>
这是一个Plunker示例:
http://plnkr.co/edit/KVMGb8uAjUwD9eOsv72z?p=preview
我做错了什么?
此致,
关键问题围绕着您对隔离作用域的使用:
scope: {
selectedId: '='
},
使用 controllerAs 绑定:
controllerAs: 'vm',
基本上,这基本上是将视图模型放在指令范围内,通过您在 controllerAs 中分配的别名进行访问。 所以基本上在你去的时候在你的 html 中:
<directive-a data-selected-id="vm.sharedData.selectedId"></directive-a>
您实际上正在访问指令 - 视图模型,而不是 MainCtrl 视图模型。 因为您将指令-a 设置为具有隔离范围......这是一个新的范围,与 MainCtrl 隔离。
您需要做的更多是以下几行:
http://plnkr.co/edit/wU709MPdqn5m2fF8gX23?p=preview
编辑
TLDR:我建议在使用隔离范围时使用唯一的视图模型别名 (controllerAs),以正确反映它们不是同一个视图模型的事实。
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