Consider this Plnkr for example. I don't know how many members of fooCollection will be created beforehand. So I don't know how many bar models are going to exist.
But I know they are going to be angular models, and I know where they are going to be.
How do I do a $watch on these?
I need to do that because I need to trigger behavior when a bar model is changed. Watching the fooCollection itself is not enough, the $watch listener does not fire when a bar is changed.
Relevant html:
<body ng-controller="testCtrl">
<div ng-repeat="(fooKey, foo) in fooCollection">
Tell me your name: <input ng-model="foo.bar">
<br />
Hello, my name is {{ foo.bar }}
</div>
<button ng-click="fooCollection.push([])">Add a Namer</button>
</body>
Relevant JS:
angular
.module('testApp', [])
.controller('testCtrl', function ($scope) {
$scope.fooCollection = [];
$scope.$watch('fooCollection', function (oldValue, newValue) {
if (newValue != oldValue)
console.log(oldValue, newValue);
});
});
See Question&Answers more detail:
os 与恶龙缠斗过久,自身亦成为恶龙；凝视深渊过久,深渊将回以凝视…
