`Misconceptions in understanding AngularJS directives`

I am currently working on a new app that includes both a header and main view, utilizing directives. At first, I had the directive in its own file but decided to relocate it into app.js in order to resolve an issue.

Throughout this process, I have experimented with several approaches:

  • <app-header> & <div=app-header>
  • Modifying templateUrl to template:"Test header"
  • Linking the directive and app.directive together

This is what my index.html looks like:

    <!DOCTYPE html>
    <html lang="en" ng-app="simpleLoginApp">

    <head>
        <meta charset="utf-8" />
        <title> Simple Login </title>
    </head>

    <body>
        <div app-header></div>
        <main role="main" ng-view></main>

        <script src="resources/angular/angular.min.js"></script>
        <script src="resources/angular-route/angular-route.js"></script>
        <script src="app.js"></script>
    </body>

    </html>

Here is a snippet from my app.js:

var app = angular.module('simpleLoginApp', ['ngRoute'])

.directive('app-header', function() {
  return {
    templateUrl: '/header/header.html'
  };
})

.config(['$routeProvider', function($routeProvider) {
    $routeProvider
        .when('/login', {
            templateUrl: '/login/login.html',
            controller: 'LoginCtrl'
        })
}]);

Lastly, here's a look at the contents of header.html:

    <header>
            <h1>HEADER</h1>
    </header>

Answer №1

The issue lies in the way you are registering your directive. It's important to use camel case when defining a directive, such as appHeader, instead of app-header. However, when using it in a template, you should still use dashes as usual. For more information, you can refer to the documentation here, specifically under the Normalization heading.

To sum up, make the following change:

.directive('app-header', function() {
  return {
    templateUrl: '/header/header.html'
  };
})

to

.directive('appHeader', function() {
  return {
    templateUrl: '/header/header.html'
  };
})

Answer №2

To create the header in Header.html, simply use:

<h1>HEADER</h1> 

Next, define your directive like this:

.directive('appHeader', function() {
  return {
    restrict: 'E', //Specify that your directive is an element  
    templateUrl: '/header/header.html'
  };
})

You can now include your directive by using it as an element in your code:

<app-header></app-header>

If you want to customize the header text, add a scope variable to your directive:

.directive('appHeader', function() {
  return {
    scope: {
        headerText: '='; 
    }
    restrict: 'E', //Specify that your directive is an element  
    templateUrl: '/header/header.html'
  };
})

Then, in your code, you can specify the header content like this:

<app-header header-text="lol this is the content of my header ^_^"></app-header> 

This approach makes your directive reusable for different headers.

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