在AngularJS中,为什么一个布尔参数被评估为一个字符串?
发布时间:2020-12-17 09:16:59 所属栏目:安全 来源:网络整理
导读:在AngularJS中,我想在一个指令中测试一个布尔值,但该值作为字符串返回. 这是代码: angular.module('TestApp',['TestApp.services','TestApp.controllers','TestApp.directives']);angular.module('TestApp.services',['ngResource']). factory('Obj',functi
在AngularJS中,我想在一个指令中测试一个布尔值,但该值作为字符串返回.
这是代码: angular.module('TestApp',['TestApp.services','TestApp.controllers','TestApp.directives']); angular.module('TestApp.services',['ngResource']). factory('Obj',function($resource){ return $resource('datas.json'); }); angular.module('TestApp.controllers',[]). controller('TestCtrl',['$scope','Obj',function($scope,Obj) { $scope.objs = Obj.query(); }]); angular.module('TestApp.directives',[]). directive('requiredStatus',function() { return function(scope,elm,attrs) { attrs.$observe('v',function(av) { if (attrs.completed) { scope.val= true; } else { scope.val= false; } scope.type = typeof attrs.completed; }); }; }); http://plnkr.co/edit/DvIvySFRCYaz4SddEvJk 在指令内部应该怎么做一个类型“boolean”?
使用$watch,它将根据范围评估观察到的属性表达式:
scope.$watch(attrs.completed,function(completed) { scope.val = completed; scope.type = typeof completed; }); 或使用范围$eval: scope.val = scope.$eval(attrs.completed); scope.type = typeof scope.val; DEMO PLUNKER (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |