javascript variable not available to HTML part
Question
I am beginner to Web dev and learning AngularJS. I am trying some assignment and encountered the problem that variable defined in a function (Angular controller) is not getting accessed in HTML and shows nothing when opened in browser. The link is: https://jsfiddle.net/2v41a6na/
Code is:
<!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>
The intended design should be like
EDIT 1: I did not use $scope above. I have similar code, which works perfectly but with different design. Code is
<!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>
Outpur for the above code is:
Now I am unable to understand why this one works but not first one. Both of them do not use $scope .
2 answers
solution1
3 ACCPTED 2017-01-03 14:20:36
You don't need to declare it in $scope . The second example uses angular's controller as syntax, in which the variables and methods are bound directly into the returned controller. You have the ng-controller="menuController as menuCtrl" , and so the list of dishes is the value of menuCtrl.dishes .
In your first example, you're not using the controller as syntax. You either need to do it by using for example ng-controller="dishDetailController as detailCtrl" so you can access your dish variable with detailCtrl.dish , or then as others have said, you can use ng-controller="dishDetailController" and then in your controller $scope.dish = dish .
EDIT: More information here: https://docs.angularjs.org/api/ng/directive/ngController#example
solution2
1 2017-01-03 14:12:34
Two things
1) declare ng-app in HTML as
<div class="container" ng-app="confusionApp">
2) and use $scope in controller like
app.controller('dishDetailController', function($scope) {
$scope.dish={
name:'Uthapizza',
image: 'images/uthapizza.png',
category: 'mains',
label:'Hot'
}
});
Fiddle https://jsfiddle.net/2v41a6na/1/
It worked due to this line in HTML
<div class="row row-content" ng-controller="menuController as menuCtrl">
Even your code will work just you have declare your controller in HTML like
<div class="row row-content" ng-controller="dishDetailController as dishes" >
and replace all dish with dishes.dish
<h2 class="media-heading">{{dishes.dish.name}}
<span class="label label-danger">{{dishes.dish.label}}</span>
Working fiddle
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