Using the <head> or <script> tag within my custom AngularJS2 component in ng2

When I first initiate index.html in AngularJS2, the structure looks something like this:

<!doctype html>
<html>
    <head>
        <title>demo</title>
        <meta name="viewport" content="width=device-width, initial-scale=1">   

        <meta charset="utf-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <meta name="viewport" content="width=device-width, initial-scale=1">

        <!-- 1. Load libraries -->
        <!-- IE required polyfills, in this exact order -->
        <script src="node_modules/es6-shim/es6-shim.min.js"></script>
        <script src="node_modules/systemjs/dist/system-polyfills.js"></script>
        <script src="node_modules/angular2/es6/dev/src/testing/shims_for_IE.js"></script>   
        <script src="node_modules/angular2/bundles/angular2-polyfills.js"`enter code here`></script>
        <script src="node_modules/systemjs/dist/system.src.js"></script>
        <script src="node_modules/rxjs/bundles/Rx.js"></script>
        <script src="node_modules/angular2/bundles/angular2.dev.js"></script>

        <!-- 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]-->

        <link href="app/css/jquery-ui.css" rel="stylesheet">
    <link href="app/css/bootstrap.min.css" rel="stylesheet">
    <link href="app/css/font-awesome.min.css" rel="stylesheet">
    <link href="app/css/style.css" rel="stylesheet">

        <script src="app/js/jquery.min.js"></script>
        <script src="app/js/jquery-ui.min.js"></script>
        <!-- Include all compiled plugins (below), or include individual files as needed -->
        <script src="app/js/bootstrap.min.js"></script>

        <!-- 2. Configure SystemJS -->
        <script>
            System.config({
                packages: {
                    app: {
                        format: 'register',
                        defaultExtension: 'js'
                    }
                }
            });
            System.import('app/ts/main').then(null, console.error.bind(console));
        </script>
    </head>

    <!-- 3. Display the application -->
    <body>
        <div id="top-bar"></div>

        <script>
            $("#top-bar").load("app/html/navbar.html nav");
        </script>

    <my-app>Loading...</my-app>
</body>
</html>

After loading app/ts/main, which is a typescript file that contains the main application component, my pages such as intro.html are loaded without any errors.

However, a problem arises when trying to use tags like script or head within intro.html and other HTML components. For instance, if intro.html defines a title within the head tag as "test", it will still display the title from index.html ("demo"). Additionally, other components cannot load any content inside the script tags. This means actions like loading the navigation bar using a script must be done in index.html rather than within separate components like intro.html. The script and head tags seem to be ignored by components other than index.html. So how can these tags be effectively used within the components instead of being confined to index.html?

Answer №1

In my perspective, the approach you're taking might not be the most efficient - consider updating the page title using document.title in your code, and converting your navigation bar into an Angular component instead of loading it through a script tag with jQuery. I believe that relying on jQuery within an Angular framework is generally not the best option, as it should only be utilized when specific control over the DOM is crucial.

Answer №2

<script> elements in component templates get removed by Angular. Instead, you can utilize alternative methods such as using require(...) to include scripts

Angular currently only supports the <title> tag within the <head> section through the Title service

constructor(private title:Title) {
}

someMethod() {
  this.title.setTitle('new Title');
}

You have the option to directly access document.title as suggested by @JoeClay, however, this method is not compatible with Angular's server-side rendering or use of WebWorkers.

Discussions indicate that there are plans for introducing abstractions for additional browser APIs in Angular, but there is no specific timeline provided for their implementation.

There is also a DOM reference available, represented by a DomAdapter instance, which allows for accessing browser APIs in a manner compatible with WebWorkers (Note: There is an active issue regarding this at https://github.com/angular/angular/issues/6904)

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