Outlet templates hit bg

I started my journey seeking clarity about two concepts but now I had four of them, sounding nearly the same! Have you ever been to this situation?

If yes, then you are in the right place. These template elements only work in the presence of structural directives. The final DOM is similar to what we have seen at the beginning of this article:. As these elements work only with a structural directive, we can write as:.

Here home is a boolean property of the component set to true value. The output of the above code in DOM:. This was the expected result. No doubt the above code would not generate any error, as Angular is perfectly fine with your use case. You would never get to know what exactly happened behind the scenes.

If you watch closely, there is one extra comment tag in the final DOM of Example 2. The code that Angular interpreted was:. This is why you could not see any of your message. In this method, you are providing Angular with the de-sugared format that needs no further processing. Thus, it will render the content correctly. To know more about how to use this format with other structural directives refer to this article.

They are used as a container to templates that can be reused at multiple places. We will cover more on this in a later section of this article. The same way that we can refer to the loading template using a template reference, we can also have a template injected directly into our component using the ViewChild decorator:. As we can see, the template can be injected just like any other DOM element or component, by providing the template reference name defaultTabButtons to the ViewChild decorator.

This means that templates are accessible also at the level of the component class, and we can do things such as for example pass them to child components! An example of why we would want to do that is to create a more customizable component, where can pass to it not only a configuration parameter or configuration object: we can also pass a template as an input parameter.

Let's take for example a tab container, where we would like to give the user of the component the possibility of configuring the look and feel of the tab buttons. Here is how that would look like, we would start by defining the custom template for the buttons in the parent component:.

And then on the tab container component, we could define an input property which is also a template named headerTemplate :. The end result of this design is that the tab container will display a default look and feel for the tab buttons if no custom template is provided, but it will use the custom template if its available. The core directives ng-container, ng-template and ngTemplateOutlet all combine together to allow us to create highly dynamical and customizable components.

We can even change completely the look and feel of a component based on input templates , and we can define a template and instantiate on multiple places of the application. I hope that this post helped to get familiar with some of the more advanced features of Angular core, if you have some questions please let me know in the comments below and I will get back to you.

And if you would like to know about more advanced Angular Core features, we recommend checking the Angular Core Deep Dive course, where Angular Templates are covered in much more detail. If you are just getting started learning Angular, have a look at the Angular for Beginners Course :. Table Of Contents In this post, we will be going over the following topics: Introduction to the ng-template directive Template Input Variables The ng-template directive use with ngIf ngIf de-suggared syntax and ng-template ng-template template references and the TemplateRef injectable Configurable Components with Template Partial Inputs The ng-container directive, when to use it?

Dynamic Template with the ngTemplateOutlet custom directive Template outlet Input Properties Final Combined Example Summary and Conclusions Introduction to the ng-template directive Like the name indicates, the ng-template directive represents an Angular template: this means that the content of this tag will contain part of a template, that can be then be composed together with other templates in order to form the final component template.

Here we are defining two tab buttons of a tab component more on this later : The first thing that you will notice about ng-template If you try the example above, you might be surprised to find out that this example does not render anything to the screen! But based on this example, one question might come to mind: How does this work if there are multiple structural directives applied to the same element?

Multiple Structural Directives Let's see what happens if for example we try to use ngIf and ngFor in the same element: This would not work! Instead, we would get the following error message: Uncaught Error: Template parse errors: Can't have multiple template bindings on one element.

In order to do so, we would have to do something similar to this: In this example, we have moved the ngIf directive to an outer wrapping div, but in order for this to work we have to create that extra div element. Yes and that is exactly what the ng-container structural directive allows us to do! The ng-container directive In order to avoid having to create that extra div, we can instead use ng-container directive: As we can see, the ng-container directive provides us with an element that we can attach a structural directive to a section of the page, without having to create an extra element just for that.

Dynamic Template Creation with the ngTemplateOutlet directive Being able to create template references and point them to other directives such as ngIf is just the beginning. We can also take the template itself and instantiate it anywhere on the page, using the ngTemplateOutlet directive: We can see here how ng-container helps with this use case: we are using it to instantiate on the page the loading template that we defined above.

Template Context One key question about templates is, what is visible inside them? Pantone Color of the Year Chalkboard education presentation widescreen. Group project presentation Berlin themes, widescreen. Bright business presentation. Rainbow presentation. Gameboard infographics poster.