例如考虑
this Plnkr。我不知道将会创建多少fooCollection的成员。所以我不知道有多少条模型会存在。
但我知道他们将是有角度的模型,我知道他们会在哪里。
我如何做一个$手表这些?
我需要这样做,因为我需要在改变条形模型时触发行为。观察fooCollection本身是不够的,当改变条形时,$ watch监听器不会触发。
相关html:
<body ng-controller="testCtrl"> <div ng-repeat="(fooKey,foo) in fooCollection"> Tell me your name: <input ng-model="foo.bar"> <br /> Hello,my name is {{ foo.bar }} </div> <button ng-click="fooCollection.push([])">Add a Namer</button> </body>
相关JS:
angular .module('testApp',[]) .controller('testCtrl',function ($scope) { $scope.fooCollection = []; $scope.$watch('fooCollection',function (oldValue,newValue) { if (newValue != oldValue) console.log(oldValue,newValue); }); });
创建单个列表项目控制器:
demo on Plnkr
js
angular .module('testApp',[]) .controller('testCtrl',function ($scope) { $scope.fooCollection = []; }) .controller('fooCtrl',function ($scope) { $scope.$watch('foo.bar',function (newValue,oldValue) { console.log('watch fired,new value: ' + newValue); }); });
HTML
<html ng-app="testApp"> <body ng-controller="testCtrl"> <div ng-repeat="(fooKey,foo) in fooCollection" ng-controller="fooCtrl"> Tell me your name: <input ng-model="foo.bar" ng-change="doSomething()"> <br /> Hello,my name is {{ foo.bar }} </div> <button ng-click="fooCollection.push([])">Add a Namer</button> </body> </html>