[英]double curly brackets {{ }} not binding text to h1 element
我正在嘗試使用 $filter 服務創建一個函數,該函數返回在文本字段中鍵入的字符的小寫版本。 我究竟做錯了什么?
var myApp = angular.module('myApp', []); myApp.controller('mainController', ['$scope', '$filter', function($scope, $filter) { $scope.handle = ''; $scope.lowercasehandle = function() { return $filter('lowercase')($scope.handle); }; }]);
<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.7.5/angular.min.js"></script> <div ng-app="myApp"> <header> <nav class="navbar navbar-default"> <div class="container"> <div class="navbar-header"> <a class="navbar-brand" href="/">AngularJS</a> </div> <ul class="nav navbar-nav navbar-right"> <li><a href="#"><i class="fa fa-home"></i> Home</a></li> </ul> </div> </nav> </header> <div class="container"> <div> <label>What is your twitter handle?</label> <input type="text" ng-model="handle" /> </div> <hr /> <h1>twitter.com/{{ lowercasehandle() }}</h1> </div> </div>
您沒有在任何地方添加ng-controller
指令。 添加它,它的工作原理。 此外,您可以直接在 html 中使用過濾器:
var myApp = angular.module('myApp', []); myApp.controller('mainController', ['$scope', '$filter', function($scope, $filter) { $scope.handle = ''; }]);
<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.7.5/angular.min.js"></script> <div ng-app="myApp"> <header> <nav class="navbar navbar-default"> <div class="container"> <div class="navbar-header"> <a class="navbar-brand" href="/">AngularJS</a> </div> <ul class="nav navbar-nav navbar-right"> <li><a href="#"><i class="fa fa-home"></i> Home</a></li> </ul> </div> </nav> </header> <div class="container" ng-controller="mainController"> <!-- Here --> <div> <label>What is your twitter handle?</label> <input type="text" ng-model="handle" /> </div> <hr /> <h1>twitter.com/{{ handle | lowercase }}</h1> </div> </div>
您可以直接在模板中使用過濾器:
<h1>twitter.com/{{ handle | lowercase }}</h1>
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