I have just started learning Angular and trying to print some text through angular custom directive. but nothing is getting print. Please help me out. Here is the index.html and script.js file.
angular.module('main', [])
.controller('mainCtrl', function ($scope) {
$scope.name = "firoz";
})
.directive('myDir', function () {
return {
restrict : 'E',
template: '<div>Trying to print this text</div>'
};
});
<!DOCTYPE html>
<html ng-app="main">
<head>
<script data-require="angular.js#1.3.17" data-semver="1.3.17" src="https://code.angularjs.org/1.3.17/angular.js"></script>
<link rel="stylesheet" href="style.css" />
<script src="script.js"></script>
</head>
<body ng-controller="mainCtrl">
<mydir></mydir>
</body>
</html>
Here is the Plunker link : http://plnkr.co/edit/ub9Ch34OtckzQuCI9sDk?p=preview
You need to hyphenate anywhere that has a capital when used in the directive, like:
<my-dir></my-dir>
The correct Angular syntax is:
<my-dir></my-dir>
angular.module('main', [])
.controller('mainCtrl', function ($scope) {
$scope.name = "firoz";
})
.directive('myDir', function () {
return {
restrict : 'E',
template: '<div>Trying to print this text</div>'
};
});
<!DOCTYPE html>
<html ng-app="main">
<head>
<script data-require="angular.js#1.3.17" data-semver="1.3.17" src="https://code.angularjs.org/1.3.17/angular.js"></script>
<link rel="stylesheet" href="style.css" />
<script src="script.js"></script>
</head>
<body ng-controller="mainCtrl">
<my-dir></my-dir>
</body>
</html>
Related
This is my first attempt at angularJs components so please have patience. Any ideas why it would not print Hello World?
http://plnkr.co/edit/D3DMVAaechJUj4ZzPBDL?p=preview
script.js
(function () {
'use strict';
angular
.module('myApp', [])
.component('sampleComponent', {
template: '<h1>Hello {{$ctrl.name}}!</h1>',
bindings: {
name: '<'
},
controller: function () {
//alert('here');
}
});
})();
index.html
<!DOCTYPE html>
<html>
<head>
<script data-require="angular.js#1.6.2" data-semver="1.6.2" src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.2/angular.js"></script>
<script data-require="angular.js#1.6.2" data-semver="1.6.2" src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.2/angular-route.js"></script>
<link rel="stylesheet" href="style.css" />
<script src="script.js"></script>
</head>
<body ng-app="myApp">
<sample-component name="World"></sample-component>
</body>
</html>
You're using '<' for your binding. This means that when passing name="World", World is supposed to be an Angular expression, whose value is passed to the component. Since you have no World variable in the root scope, it's undefined, and an empty string is thus displayed.
Use '#' for your binding, or use name="'World'".
I have the directive that find the elements height and need to have the same value to the controller from the directive.
I tried the below mentioned code and i could not find the solution, am facing some issues.
Could anyone help me on this?
HTML
<!DOCTYPE html>
<html>
<head>
<script data-require="angular.js#*" data-semver="1.2.13" src="http://code.angularjs.org/1.2.13/angular.js"></script>
<link rel="stylesheet" href="style.css" />
<script src="script.js"></script>
<script src="controller.js"></script>
</head>
<body ng-app="myModule">
<div myDirective style="height: 300px;" ng-controller="myheight">
{{numvalue()}}
</div>
</body>
</html>
script.js for directive
angular.module('myModule', [])
.directive('myDirective', function($timeout) {
return {
restrict: 'A',
link: function(scope, element) {
scope.height = element.prop('offsetHeight');
scope.width = element.prop('offsetWidth');
}
};
})
;
contoller.js for controller
angular.module('myModule', []).controller("myheight", function($scope){
$scope.numvalue = function(){
$scope.divHeight = $scope.height;
return $scope.divHeight;
}
});
You don't need $scope.numvalue();
Your directive looks fine. Just add it to the html and change code to following.
<div ng-app="myModule">
<div style="height: 300px;" my-directive ng-controller="myHeight">
Getting height {{height}}
</div>
</div>
JSFiddle
--EDIT--
Check the updated fiddle
JSFiddle
just expose a varible of controller to the directive. after compilation process of the directive you can access the scope variable divHeight in your controller.
angular.module('myModule', [])
.directive('myDirective', function($timeout) {
return {
restrict: 'A',
scope:{
divHeight: '='
},
link: function(scope, element) {
scope.divHeight = element.prop('offsetHeight');
scope.width = element.prop('offsetWidth');
}
};
});
HTML
<!DOCTYPE html>
<html>
<head>
<script data-require="angular.js#*" data-semver="1.2.13" src="http://code.angularjs.org/1.2.13/angular.js"></script>
<link rel="stylesheet" href="style.css" />
<script src="script.js"></script>
<script src="controller.js"></script>
</head>
<body ng-app="myModule">
<div myDirective div-Height="divHeight" style="height: 300px;" ng-controller="myheight">
{{numvalue()}}
</div>
</body>
</html>
I have 2 things to do:
custom directive for dropdowns
custom directive for upload
var app=angular.module('app.directives', []);
app.directive('dropdowns', function() {alert("dropdown directive");
return {
restrict: 'AE',
templateUrl: 'html/uploadFile.html'
};
});
app.directive('uploadDir', function() {
alert("upload directive");
return {
restrict : 'AE',
templateUrl : 'html/dropdowns.html'
};
});
The directive for dropdown is working
But the directive for upload is not working(the alert message in uploadDir directive is not getting displayed)
Is the syntax correct?
index.html
<!DOCTYPE html>
<html ng-app="app">
<head>
<meta charset="ISO-8859-1">
<title>upload using directive</title>
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.14/angular.min.js"></script>
<script type="text/javascript" src="lib/ui-bootstrap-tpls-0.13.0.js"></script>
<link type="text/css" rel="stylesheet" href="css/bootstrap.min.css"/>
<script type="text/javascript" src="js/app.js"></script>
<script type="text/javascript" src="js/controllers/controllers.js"></script>
<script type="text/javascript" src="js/services/services.js"></script>
<script type="text/javascript" src="js/directives/directives.js"></script>
</head>
<body>
<div>
<div dropdowns></div>
<div uploadDir></div>
</div>
</body>
</html>
Use <div upload-dir></div>. Directive names in camel case are normalised with dashes when matching against HTML elements.
Why is that when I run my Angular app, I don't get directive running?
Example code:
var app = angular.module("app",['mgcrea.ngStrap','layout.menu']);
app.controller('MainController', ['$scope','$timeout', function($scope,$timeout){
$timeout(function(){console.log("ready")});
}]);
var menu = angular.module('layout.menu', [])
.controller('MenuController', ['$scope', function($scope){
console.log("controller");
}])
.directive('menuDir', ['$window', function($window){
console.log("directive");
return function (scope, element) {
console.log("return directive");
};
}]);
HTML:
<!DOCTYPE html>
<html lang="en" ng-app="app">
<head>
<meta charset="UTF-8">
<title>Document</title>
<link rel="stylesheet" type="text/css" href="assets/libs/bootstrap/dist/css/bootstrap.min.css">
<script src="assets/libs/jquery/dist/jquery.min.js"></script>
<script type="text/javascript" src="assets/libs/angular/angular.js"></script>
<script type="text/javascript" src="assets/libs/angular-strap/dist/angular-strap.js"></script>
<script src="assets/libs/angular-strap/dist/angular-strap.tpl.min.js"></script>
<script type="text/javascript" src="app.js"></script>
</head>
<body ng-controller="MainController">
<div class="list-group mainmenu" id="mainmenu" ng-controller="MenuController"></div>
</body>
</html>
When I run the app, I get the controller output, but no output from directive. Why? How can I fix it?
Directives/Services/Factories in angularJs are lazily instantiated.
They will be processed only when we use them.
Use the menuDir directive in your markup, then you will see the console statement written inside your directive.
Can I have loading some data once in angular module? I tried to use .run() but it gets called whenever page is accessed. For Example: say there are 2 html pages belonging to same module:
TestPage1.html:
<html ng-app="myApp">
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<script src="js/angular.min.js"></script>
<script src="js/jquery-1.8.2.js"></script>
<script src="js/app.js"></script>
</head>
<body>
<p><a ng-href="TestPage2.html">Go to Page2</a></p>
</body>
</html>
TestPage2.html:
<html ng-app="myApp">
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<script src="js/angular.min.js"></script>
<script src="js/jquery-1.8.2.js"></script>
<script src="js/app.js"></script>
</head>
<body>
<p><a ng-href="TestPage1.html">Go to Page1</a></p>
</body>
</html>
app.js:
var myApp = angular.module('myApp', []);
var cnt = 0;
myApp.run(['$rootScope', '$http', function(scope, $http) {
if(scope.loggedIn == undefined || scope.loggedIn == null) {
$http.get('rest/userData').success(function(data) {
cnt++;
alert(cnt);
scope.loggedIn = true;
});
}
}]);
When I navigate from one page to another this .run() is getting called again and again with cnt as 1. Is it possible to have it called once in life- time of module getting initialized? Or what is the other way?
It seems you are missing some basics such as a controller. The typical angular setup is having an ng-view for your app and loading the other pages via routing. Here is a simple example:
http://beta.plnkr.co/edit/RnZWeWxTJFri49Bvw50v?p=preview
app.js
var app = angular.module('myApp', []).
config(['$routeProvider', function($routeProvider) {
$routeProvider.when('/view1', {templateUrl: 'TestPage1.html', controller: Page1Ctrl});
$routeProvider.when('/view2', {templateUrl: 'TestPage2.html', controller: Page2Ctrl});
$routeProvider.otherwise({redirectTo: '/view1'});
}]).run(function () { // instance-injector
alert('only run on first page load this is where you load data or whatever ONE time'); // this only runs ONE time
})
function MainCtrl($scope) {
$scope.name = 'main';
}
function Page1Ctrl($scope) {
$scope.name = 'page 1';
}
function Page2Ctrl($scope) {
$scope.name = 'page 2';
}
HTML:
<html ng-app="myApp" >
<head>
<meta charset="utf-8">
<title>AngularJS Plunker</title>
<link rel="stylesheet" href="style.css">
<script>document.write("<base href=\"" + document.location + "\" />");</script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.0.2/angular.js"></script>
<script src="app.js"></script>
</head>
<body ng-controller="MainCtrl">
This is the main page. Main nav:
<a ng-href="#/view1">Go to Page1</a>
<a ng-href="#/view2">Go to Page2</a>
<div ng-view></div>
</body>
</html>
You will notice in the html there is an ng-view, when a route is encountered such as #/view the routeprovider looks it up and provides the correct template and calls the appropriate controller. I believe this is the kind of setup you are trying to achieve.