31.5. Angular Wrap-Up¶
Over the past three chapters, you have learned:
What templates are and why we want to use them,
How to use the Angular CLI to create a new project, generate new components, and run a project locally in your web browser.
How to define custom HTML tags and use them to arrange components within a template.
How to use the structural directives
*ngIfto automatically generate HTML elements and display dynamic content.
How to catch events and set up data-binding to make your web page respond to user actions.
How to use attribute directives to modify the appearance and behavior of specific HTML elements.
31.5.1. Tip of the Iceberg¶
The Angular skills you learned are a small slice of what the framework can accomplish. They provide a solid foundation if you choose to learn more on your own.
Of course, practice makes better. The best way for you to get better at Angular is to use Angular. Adapt the examples, exercises, and studio projects however you want. Also, create your own project and build your own sample web pages. Create an interactive family photo page, a grocery list, a web based breakout box, or whatever you want.
The Angular documentation is excruciatingly complete, but do not be intimidated. There are plenty of separate tutorial sites that cover individual skills and techniques. When you find an interesting topic on the Angular site, feel free to Google that topic and explore how other coders explain how to use it.
18.104.22.168. Two Topics to Consider¶
In this chapter, we discussed one-way data binding. As the name suggests,
two-way binding exists as well. We chose not to explore this idea because
one-way tasks are more flexible and more frequently used. However, two-way
binding can come in handy if you want data from an
input element to
automatically change a variable in the
A much larger idea involves passing data between different components in the same template. Passing data from a parent component to its children, from a child to the parent, or between children is VERY useful. Unfortunately, that topic is beyond the scope of these lessons.
Try Googling "Passing data between Angular components", and explore several of the most recent results. Find one that best suits your learning style, and then create a simple template that includes parent-child communication. Also, the Tour of Heros tutorial uses component to component communication.
If your future coding job involves Angular, you will most likely need to learn the skill.
31.5.2. Components Should Be Re-used¶
Recall that at their best, functions accomplish only ONE task. This makes them re-usable within the same program, or as a module accessible by many different programs. Components should behave in a similar manner. Each one should do just one simple thing and should be flexible enough to work within many different templates.
The real power of a front end framework comes when you view components as reusable elements. With time and practice, you will build a collection of small, generic components. You can then combine these tools in different ways to build small or large sections of any new project. The Lego analogy works here---the same set of blocks can be combined in multiple ways to produce different outcomes. Also, if you need consistent results on multiple web pages, then you just put the components together the same way each time instead of writing new code.
For demonstration purposes, some of our examples don't use this best practice and instead include components that serve many purposes. After you finish the following exercises and studio, consider how you could split the larger components into smaller, re-usable pieces.