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问题:
I've got a strange behavior in an angular application and I don't know if that's a bug or a known limitation:
'use strict'; var ctrl = function ($scope) { $scope.foo = false; };
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script> <div ng-app ng-controller="ctrl"> foo: {{foo}} <div ng-if="foo" style="background-color: #f00;"> <p>foo</p> </div> <div ng-if="!foo"> <br/><button ng-click="foo = true;">Show foo</button> </div> <button ng-click="foo = true">Show foo</button> </div>
http://jsfiddle.net/78R52/
I would expect that clicking one of the buttons would set foo = true, but clicking the first button (within the ng-if="!foo") doesn't change the model.
Tested version is 1.2.1.
回答1:
ng-if has its own scope, so you need to use:
<br/><button ng-click="$parent.foo = true;">Show foo</button>
Updated fiddle: http://jsfiddle.net/78R52/1/
回答2:
Ah, ng-if creates a new scope! So, "there has to be a dot in the model name"!
http://jsfiddle.net/78R52/2/
回答3:
As others have said, ng-if has its own scope. What i want to say, it's a bad practice to put expressions in the view. The good practice is to have a scope function that's called within the view.
var ctrl = function($scope){ $scope.foo = false; $scope.fn = fn; function fn(){ $scope.foo = true; } ///// <div ng-app ng-controller="ctrl"> foo: {{foo}} <div ng-if="foo" style="background-color: #f00;"> <p>foo</p> </div> <div ng-if="!foo"> <br/><button ng-click="fn()">Show foo</button> </div> <button ng-click="fn()">Show foo</button> </div>
