javascript变量不适用于HTML部分
[英]javascript variable not available to HTML part
问题描述
我是Web开发人员和学习AngularJS的初学者。 我正在尝试一些分配，并且遇到了以下问题：在函数（Angular控制器）中定义的变量无法在HTML中访问，并且在浏览器中打开时不显示任何内容。 链接是： https : //jsfiddle.net/2v41a6na/
代码是：
<!DOCTYPE html>
<html lang="en" ng-app="confusionApp">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- The above 3 meta tags *must* come first in the head; any other head
content must come *after* these tags -->
<title>Ristorante Con Fusion: Menu</title>
<!-- Bootstrap -->
<link href="../bower_components/bootstrap/dist/css/bootstrap.min.css" rel="stylesheet">
<link href="../bower_components/bootstrap/dist/css/bootstrap-theme.min.css" rel="stylesheet">
<link href="../bower_components/font-awesome/css/font-awesome.min.css" rel="stylesheet">
<link href="styles/bootstrap-social.css" rel="stylesheet">
<link href="styles/mystyles.css" rel="stylesheet">
<!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
<!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
<!--[if lt IE 9]>
<script src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>
<script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
<![endif]-->
</head>
<body>
<div class="container">
<div class="row row-content" ng-controller="dishDetailController" >
<div class="col-xs-12">
<div class="media">
<div class="media-left media-middle">
<a href="#">
<img class="media-object img-thumbnail" ng-src={{dish.image}} alt="Uthappizza">
</a>
</div>
<div class="media-body">
<h2 class="media-heading">{{dish.name}}
<span class="label label-danger">{{dish.label}}</span>
<span class="badge">{{dish.price | currency}}</span>
</h2>
<p>{{dish.description}}</p>
</div>
</div>
<!--<p>Put the dish details here</p>-->
</div>
<div class="col-xs-9 col-xs-offset-1">
<p>Put the comments here</p>
</div>
</div>
</div>
<script src="../bower_components/angular/angular.min.js"></script>
<script>
var app = angular.module('confusionApp',[]);
app.controller('dishDetailController', function() {
var dish={
name:'Uthapizza',
image: 'images/uthapizza.png',
category: 'mains',
label:'Hot',
price:'4.99',
description:'A unique combination of Indian Uthappam (pancake) and Italian pizza, topped with Cerignola olives, ripe vine cherry tomatoes, Vidalia onion, Guntur chillies and Buffalo Paneer.',
comments: [
{
rating:5,
comment:"Imagine all the eatables, living in conFusion!",
author:"John Lemon",
date:"2012-10-16T17:57:28.556094Z"
},
{
rating:4,
comment:"Sends anyone to heaven, I wish I could get my mother-in-law to eat it!",
author:"Paul McVites",
date:"2014-09-05T17:57:28.556094Z"
},
{
rating:3,
comment:"Eat it, just eat it!",
author:"Michael Jaikishan",
date:"2015-02-13T17:57:28.556094Z"
},
{
rating:4,
comment:"Ultimate, Reaching for the stars!",
author:"Ringo Starry",
date:"2013-12-02T17:57:28.556094Z"
},
{
rating:2,
comment:"It's your birthday, we're gonna party!",
author:"25 Cent",
date:"2011-12-02T17:57:28.556094Z"
}
]
};
this.dish = dish;
});
</script>
</body>
</html>
预期的设计应该像
编辑1：我没有使用$scope以上。 我有类似的代码，可以完美地工作，但设计不同。 代码是
<!DOCTYPE html>
<html lang="en" ng-app="confusionApp">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- The above 3 meta tags *must* come first in the head; any other head
content must come *after* these tags -->
<title>Ristorante Con Fusion: Menu</title>
<!-- Bootstrap -->
<link href="../bower_components/bootstrap/dist/css/bootstrap.min.css" rel="stylesheet">
<link href="../bower_components/bootstrap/dist/css/bootstrap-theme.min.css" rel="stylesheet">
<link href="../bower_components/font-awesome/css/font-awesome.min.css" rel="stylesheet">
<link href="styles/bootstrap-social.css" rel="stylesheet">
<link href="styles/mystyles.css" rel="stylesheet">
<!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
<!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
<!--[if lt IE 9]>
<script src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>
<script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
<![endif]-->
</head>
<body>
<div class="container">
<div class="row row-content" ng-controller="menuController as menuCtrl">
<div class="col-xs-12">
<ul class="nav nav-tabs" role="tablist">
<li role="presentation" ng-class="{active:menuCtrl.isSelected(1)}"><a ng-click="menuCtrl.select(1)" aria-controls="all menu" role="tab"> The Menu</a> </li>
<li role="presentation" ng-class="{active:menuCtrl.isSelected(2)}"><a ng-click="menuCtrl.select(2)" aria-controls="appetizers" role="tab"> Appetizers</a> </li>
<li role="presentation" ng-class="{active:menuCtrl.isSelected(3)}"><a ng-click="menuCtrl.select(3)" aria-controls="mains" role="tab"> Mains</a> </li>
<li role="presentation" ng-class="{active:menuCtrl.isSelected(4)}"><a ng-click="menuCtrl.select(4)" aria-controls="desserts" role="tab"> Desserts</a> </li>
</ul>
<div class="tab-content">
<ul class="media-list tab-pane fade in active">
<li class="media" ng-repeat="dish in menuCtrl.dishes | filter:menuCtrl.filtText">
<div class="media-left media-middle">
<a href="#">
<img class="media-object img-thumbnail" ng-src={{dish.image}} alt="Uthappizza">
</a>
</div>
<div class="media-body">
<h2 class="media-heading">{{dish.name}}
<span class="label label-danger">{{dish.label}}</span>
<span class="badge">{{dish.price | currency}}</span>
</h2>
<p>{{dish.description}}</p>
</div>
</li>
</ul>
</div>
</div>
</div>
</div>
<script src="../bower_components/angular/angular.min.js"></script>
<script>
var app = angular.module('confusionApp',[]);
app.controller('menuController', function(){
this.tab =1;
var dishes=[
{
name:'Uthapizza',
image: 'images/uthapizza.png',
category: 'mains',
label:'Hot',
price:'4.99',
description:'A unique combination of Indian Uthappam (pancake) and Italian pizza, topped with Cerignola olives, ripe vine cherry tomatoes, Vidalia onion, Guntur chillies and Buffalo Paneer.',
comment: ''
},
{
name:'Zucchipakoda',
image: 'images/zucchipakoda.png',
category: 'appetizer',
label:'',
price:'1.99',
description:'Deep fried Zucchini coated with mildly spiced Chickpea flour batter accompanied with a sweet-tangy tamarind sauce',
comment: ''
},
{
name:'Vadonut',
image: 'images/vadonut.png',
category: 'appetizer',
label:'New',
price:'1.99',
description:'A quintessential ConFusion experience, is it a vada or is it a donut?',
comment: ''
},
{
name:'ElaiCheese Cake',
image: 'images/elaicheesecake.png',
category: 'dessert',
label:'',
price:'2.99',
description:'A delectable, semi-sweet New York Style Cheese Cake, with Graham cracker crust and spiced with Indian cardamoms',
comment: ''
}
];
this.dishes= dishes;
this.filtText= '';
this.select = function(setTab){
this.tab = setTab;
if(setTab==2)
this.filtText= 'appetizer';
else if (setTab==3)
this.filtText= 'mains';
else if (setTab ==4)
this.filtText = 'dessert';
else
this.filtText = '';
}
this.isSelected = function(checkTab){
return (this.tab == checkTab);
}
})
</script>
</body>
</html>
上述代码的Outpur是：
现在，我无法理解为什么这个方法有效，而第一个无效。 他们两个都不使用$scope 。
2 个解决方案
解决方案1
3 已采纳 2017-01-03 14:20:36
您无需在$scope声明它。 第二个示例将angular的controller as语法，其中变量和方法直接绑定到返回的控制器中。 您有ng-controller="menuController as menuCtrl" ，因此，菜式清单是menuCtrl.dishes的值。
在第一个示例中，您没有使用controller as语法。 您可能需要使用ng-controller="dishDetailController as detailCtrl"来执行此操作，以便可以通过detailCtrl.dish访问菜品变量，或者如其他人所述，可以使用ng-controller="dishDetailController"然后在您的控制器$scope.dish = dish 。
编辑：这里的更多信息： https : //docs.angularjs.org/api/ng/directive/ngController#example
解决方案2
1 2017-01-03 14:12:34
两件事情
1）在HTML中将ng-app声明为
<div class="container" ng-app="confusionApp">
2）并在控制器中使用$ scope
app.controller('dishDetailController', function($scope) {
$scope.dish={
name:'Uthapizza',
image: 'images/uthapizza.png',
category: 'mains',
label:'Hot'
}
});
小提琴https://jsfiddle.net/2v41a6na/1/
更新
由于HTML中的这一行而起作用
<div class="row row-content" ng-controller="menuController as menuCtrl">
即使您的代码也可以正常工作，只是您已经用HTML声明了控制器，例如
<div class="row row-content" ng-controller="dishDetailController as dishes" >
并用菜代替所有菜。
<h2 class="media-heading">{{dishes.dish.name}}
<span class="label label-danger">{{dishes.dish.label}}</span>
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