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You learned that you can select elements with id, classes, tags or even attributes. Which ones should you use?
What you use depends on two factors:
If you don’t have control over the HTML, you kinda have to hack your way around the selectors. Nothing much you can do about it here.
If you have control over your HTML, you’ll want to pay attention to the number of elements you need to select.
If you only need one element, always use id. This is because id defines a unique identifier in the entire document. You can’t have two elements with the same id.
If you have more than one element, you can choose between classes, attributes and tags. Most of the time, you’ll want to use classes or attributes. Avoid tags.
Tags are too generic.
Let’s say you have the following HTML. Would it be easier for you to select .component with tags or classes?
<div>...</div>
<div class="component">...</div>
Classes and attributes are similar. You can use either. What you use depends on your use case. Usually, classes are used to select elements initially, and attributes are used to filter through them.
You’ll learn which ones to use as you build components through the course 🙂.
It can be helpful to include a js prefix for components that requires JavaScript to work. This tells developers that JavaScript is required at a glance, and prevents you (or your fellow developers) from breaking JavaScript functionality when you change the class of a component.
<div class="component jsComponent">...</div>
Note: we won’t do this for the components we build in this course.