Can't make Angular.js to work - javascript

I'm trying to learn Angular.js. I set up a simple page, in which I want to display a message from my script file. Here's the HTML structure:
<!DOCTYPE html>
<html ng-app>
<head>
<script data-require="angular.js#*" data-semver="2.0.0-alpha.31" src="https://code.angularjs.org/2.0.0-alpha.31/angular.js"></script>
<link href="style.css" rel="stylesheet" />
<script src="script.js"></script>
</head>
<body ng-controller="MainController">
<h1>{{message}}</h1>
</body>
</html>
And this is my script.js:
var MainController = function($scope){
$scope.message = "my message";
};
I'm supposed to see the words my message on the page, but instead I'm seeing literally {{message}}. I tried to wrap the JS code in self-envoking function:
(function() {
var MainController = function($scope) {
$scope.message = "my message";
};
}());
But it didn't have any result.
What am I doing wrong?

It's old syntax and you cannot declare controller like that. Now you need to register controller on your module.
angular.module('anyModuleName',[]).controller('yourControllerName',function(){
});
and also edit to ng-app="anyModuleName" where you initialize your app. In your case <html ng-app="anyModuleName">

Related

Angular js binding expression does not show value

The index.html page looks like this.
<!DOCTYPE html>
<html ng-app>
<head>
<script type="text/javascript" src="/js/script.js"/>
<script data-require="angular.js#*" data-semver="1.3.0-beta.14" src="http://code.angularjs.org/1.3.0-beta.14/angular.js"></script>
<meta charset="UTF-8">
<title>Test Page</title>
</head>
<body ng-controller="MainController">
<div>
<h1>{{message}}</h1>
<div>
{{person.firstName}}
</div>
</div>
</body>
</html>
The script.js file looks like this:
var MainController = function($scope) {
var person = {
firstName : "Nagendra"
};
$scope.person = person;
$scope.message = "Hello Angular!";
};
But when I boot up the application my page shows :
{{message}}
{{person.firstName}}
and not the values that it should. Am I missing something here? I am using spring boot.
I have debugged the chrome and have seen the js file loading properly, it even hits the debugger point in the js file,hence the file loading is not the problem i suppose.
UPDATE- THIS WORKED
var MainController = function($scope) {
var person = {
firstName: "Nagendra"
};
$scope.person = person;
$scope.message = "Hello Angular!";
};
angular.module('mainApp', [])
.controller('MainController', MainController);
index.html
<!DOCTYPE html>
<html ng-app="mainApp">
<head>
<script data-require="angular.js#*" data-semver="1.3.0-beta.14" src="http://code.angularjs.org/1.3.0-beta.14/angular.js"></script>
<script type="text/javascript" src="/js/script.js"></script>
<meta charset="UTF-8">
<title>Test Page</title>
</head>
<body ng-controller="MainController">
<div>
<h1>{{message}}</h1>
<div>
{{person.firstName}}
</div>
</div>
</body>
</html>
Since angular 1.3+ global function declaration of controller haven't been supported. So you have first create an angular module and then bind all of its angular component to it.
Also move /js/script.js right after angular.js reference with closing </script> tag.
Code
angular.module('mainApp', [])
.controller('MainController', MainController)
function MainController($scope) {
var person = {
firstName: "Nagendra"
};
$scope.person = person;
$scope.message = "Hello Angular!";
};
Then do add mainApp module inside ng-app directive like ng-app="mainApp" on html tag.
Demo Here
You need to define the module and the controller,
HTML:
<body ng-app="DemoApp" ng-controller="DemoController">
{{message}} {{person.firstName}}
</body>
Controller:
var app = angular.module('DemoApp', ['angular.filter'])
app.controller('DemoController', function($scope) {
var person = {
firstName : "Nagendra"
};
$scope.person = person;
$scope.message = "Hello Angular!";
});
DEMO

ReferenceError: random is not defined at Scope.$scope.generateRandom angular js

For some reason it gives me the error:
ReferenceError: random is not defined at Scope.$scope.generateRandom
I dont know what im doing wrong, you can go check out the website im using to do this HERE.
index.html:
<!DOCTYPE html>
<html lang= "en">
<head>
<meta charset="UTF-8" />
<title>Basic Login Form</title>
<script data-require="angular.js#1.4.x" src="https://code.angularjs.org/1.4.8/angular.js" data-semver="1.4.8"></script>
<script src = "https://rawgit.com/nirus/Angular-Route-Injector/master/dist/routeInjector.js"></script>
<script src = "https://ajax.googleapis.com/ajax/libs/angularjs/1.4.2/angular-route.js"></script>
<script type="text/javascript" src="script23.js"></script>
</head>
<body ng-app = "app" ng-controller = "app">
<button ng-click = "generateRandom()">Generate Random Number</button>
<br> {{randomNumber}}
</body>
</html>
script23.js:
var app = angular.module('app', []);
app.service('random', function(){
var randomNum = Math.floor(Math.random()*10)
this.generate = function(){
return randomNum;
}
});
app.controller('app' , function($scope){
$scope.generateRandom = function(){
alert("Something")
$scope.randomNumber = random.generate();
}
})
To use service in controller, you need to inject it.
app.controller('app', function ($scope, random) {
I'd recommend you to use following syntax:
app.controller('app', ['$scope', 'random', function ($scope, random) {
See Why we Inject our dependencies two times in angularjs?
Change your controller like this, since you are using the service 'random'
myApp.controller('app', ['$scope','random', function( $scope,random)
{
$scope.generateRandom = function(){
alert("Something")
$scope.randomNumber = random.generate();
}
}])
Here is the working Application

ng:areq error in simple app [duplicate]

This question already has answers here:
Controller not a function, got undefined, while defining controllers globally
(14 answers)
Closed 7 years ago.
I have this very simple Angular example:
<html ng-app>
<head>
<title>Angular Test</title>
</head>
<body ng-controller='myController'>
<h1>Angular Test</h1>
<p>{{hello.text}}</p>
<script src='https://ajax.googleapis.com/ajax/libs/angularjs/1.3.16/angular.min.js'></script>
<script>
function myController ($scope) {
$scope.hello = {text : 'Hello World!'};
}
</script>
</body>
</html>
As you can see I'm using Angular from the CDI. Though when I view this in my browser I get the following error:
Error: [ng:areq] http://errors.angularjs.org/1.3.16/ng/areq?p0=myController&p1=not%20a%20function%2C%20got%20undefined
at Error (native)
at https://ajax.googleapis.com/ajax/libs/angularjs/1.3.16/angular.min.js:6:417
at Sb (https://ajax.googleapis.com/ajax/libs/angularjs/1.3.16/angular.min.js:19:510)
at La (https://ajax.googleapis.com/ajax/libs/angularjs/1.3.16/angular.min.js:20:78)
at $get (https://ajax.googleapis.com/ajax/libs/angularjs/1.3.16/angular.min.js:75:465)
at https://ajax.googleapis.com/ajax/libs/angularjs/1.3.16/angular.min.js:57:178
at q (https://ajax.googleapis.com/ajax/libs/angularjs/1.3.16/angular.min.js:7:428)
at M (https://ajax.googleapis.com/ajax/libs/angularjs/1.3.16/angular.min.js:57:45)
at g (https://ajax.googleapis.com/ajax/libs/angularjs/1.3.16/angular.min.js:51:409)
at g (https://ajax.googleapis.com/ajax/libs/angularjs/1.3.16/angular.min.js:51:426)
I've literally just started with Angular so this might very well be a very noob mistake.
You're using Angular 1.3.16, which means you have to manually register your controller to your app, and don't make it anonymous.
So you need to change this in the javascript code:
var myApp = angular.module('myApp', []);
myApp.controller('myController', myController);
And define your module like this:
ng-app="myApp"
check your library location and please put inside head
<html ng-app>
<head>
<title>Angular Test</title>
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.0.5/angular.min.js"></script>
</head>
<body ng-controller='myController'>
<h1>Angular Test</h1>
<p>{{hello.text}}</p>
<script>
function myController ($scope) {
$scope.hello = {text : 'Hello World!'};
}
</script>
</body>
</html>
Plunker: http://plnkr.co/edit/gBUAabtisdHFKxikmjkA?p=preview

AngularJS route won't load the view and reports no errors

Here is the structure:
Here are the sources:
/* #flow */
"use strict";
(function () {
const app = angular.module('Lesson2', ['ngRoute', 'ngAnimate'] );
app.config(function($routeProvider){
$routeProvider
.when('/what', { controller:'FavoCtrl', templateURL:'pages/what.html'})
.when('/where', { controller:'FavoCtrl', templateURL:'pages/where.html'})
.otherwise({redirectTo:'/what'});
});
app.controller('FavoCtrl', function ($scope) {
$scope.favouriteThings=[
{what:'raindrops', by:'on', where:'roses'},
{what:'whiskers', by:'on', where:'mittens'},
{what:'Brown paper packages', by:'tied up with', where:'strings'},
{what:'schnitzel', by:'with', where:'noodles'},
{what:'Wild geese', by:'that fly with', where:'the moon on their wings'},
{what:'girls', by:'in', where:'white dresses'},
{what:'Snowflakes', by:'that stay on', where:'my nose and eyelashes'}
];
})
})();
<!DOCTYPE html>
<html ng-app="Lesson2">
<head lang="en">
<link rel="stylesheet" type="text/css" href="styles/style.css">
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.15/angular.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.15/angular-route.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.15/angular-animate.min.js"></script>
<script src="scripts/app.js"></script>
<meta charset="UTF-8">
<title>Lesson 2</title>
</head>
<body>
Hello!
<ng-view></ng-view>
</body>
</html>
And two "what.html" and "where.html" are plain texts, like This is "where.html"
The hardest thing here is that browser does not throw any error, console is clean. Views are not loaded, all I see is "Hello" of "index.html"
Seems like you have a typo, in your config block, use templateUrl instead of templateURL.
It should look like:
app.config(function($routeProvider){
$routeProvider
.when('/what', { controller:'FavoCtrl', templateUrl:'pages/what.html'})
.when('/where', { controller:'FavoCtrl', templateUrl:'pages/where.html'})
.otherwise({redirectTo:'/what'});
});
First you have a typo in your route configuration, it is "templateUrl" and not "templateURL".
If this doesn't solve your problem try adding the controller in your index.html
<html ng-app="Lesson2" ng-controller="FavoCtrl">

AngularJS controller does not work, why? (simple controller example)

I just saw a video of introduction to AngularJS and use the following example
The html:
<!DOCTYPE html>
<html ng-app>
<head lang="en">
<meta charset="UTF-8">
<title></title>
</head>
<body ng-controller="MainContrl">
<h2>{{message}}</h2>
<script src="bower_components/angular/angular.min.js"></script>
<script src="js/test.js"></script>
</body>
</html>
The js:
var MainContrl = function($scope){
$scope.message = "Hello friend";
};
In the example I've seen this structure works, but when I test it does not work.
The console gives me this error:
Error: [ng:areq] http://errors.angularjs.org/1.3.15/ng/areq?p0=MainContrl&p1=not%20a%20function%2C%20got%20undefined
Can be used in this way the controller?
Or is it a bad practice
Example in Plunker:
Code example
I think, it's a bad practice
You better use:
var myApp = angular.module('myApp', []);
myApp.controller('MainContrl', ['$scope', function ($scope) {
// any code here
]);
And use this in HTML:
<html ng-app="myApp">
<body ng-controller="MainContrl">
// any code here
</body>
</html>
You may need to define your angular App first :
var myApp = angular.module('myApp', []);
myApp.controller('MainContrl', function ($scope) {
$scope.message = "Hello friend";
});
here is a working example on Plunkr
I think you have to have a main app.
In myapp.js
var yourApp = angular.module('myApp',[]);
In mainController.js (it should not be called test.js)
yourApp.controller('MainController',['$scope',function($scope){
$scope.message = "Hello world";
}]);
In your index.html
<html ng-app="myApp">
<body ng-controller="MainController">
{{message}}
</body>'
<script src="bower_components/angular/angular.min.js"></script>
<script src="js/myapp.js"></script>
<script src="js/mainController.js"></script>
</html>
Change Your script.js to
var app=angular.module('myapp',[]);
app.controller('MainContrl', ['$scope', function($scope){
$scope.message = "Hello friend";
}]);
and in html page put ng-app in body tag and remove ng-app from html
<body ng-app="myapp" ng-controller="MainContrl">
First declare your app in your html:
<html ng-app="myApp">
Second define your app in your js:
var app = angular.module('myApp', []);
Then definewhatever controller in whatever js file (best practice sugests that every controller has its own file):
var MainContrl = function($scope){
$scope.message = "Hello friend";
};
Then declare your controller and variables in your html:
<body ng-controller="MainContrl">
<h2>{{message}}</h2>
</body>
Don't forget to bind your controller with your app:
app.controller('MainContrl',MainContrl);
I also can see that you're using bower, so I suggest you read this:
http://www.sitepoint.com/kickstart-your-angularjs-development-with-yeoman-grunt-and-bower/

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