Every front-end developer knows about the normal ways to design a web application. Connect external stylesheet with an HTML file, apply classes and that’s it. However, many front-end developers don’t know that there are many other ways to customize the appearance of a web application built in React.
Design web application via external stylesheet
This is the standard approach for styling web applications in CSS. Linking React components with CSS files is pretty similar to how we do it in HTML. First we create a CSS stylesheet, write required CSS rules, and use the import statement to make it available in the React component.
Linking CSS files with React components is good if you’re already familiar with the process of writing CSS rules for styling web applications. Most web developers have been using this syntax for years.
Using inline styles
Many React developers will advise against using inline styles, but there are certain use cases where they are useful. For example, if you are building a prototype of a web application, or just a small application.
In React, inline styles are written as JavaScript objects. And you probably know that React elements are written in JSX. You can set the style attribute of React elements to a JavaScript objects where keys represent CSS properties, and values represent CSS values. For example, something like this:
{backgroundColor: “red”}
As you can see, instead of writing CSS property as you would in a separate stylesheet (‘background-color’), we write it as backgroundColor – two words pushed together and camelCased. Also, the value of this property needs to be a string or other valid JavaScript value. You can also use string interpolation to dynamically style element in React. Here's a guide that explains how that works:
https://simplefrontend.com/string-interpolation-in-react-tutorial-with-examples/
One final detail is that in order to evaluate JavaScript objects as such inside JSX, you need to wrap JavaScript code with an additional pair of curly braces.
Conditional styling
A great thing about React web applications is that you can dynamically customize the appearance of each element. For example, if a user enters wrong value into the email field, change the color of input element to red and highlight the error.
In React, you can use expressions like ternary operators to set up a condition and dynamically return one class value or another. This is the best approach for setting an inline expression that generates a dynamic class value. The process is better described in this tutorial on setting conditional className values in React.
Alternatively, you can create a condition outside of JSX. This is better, because you can’t use statements like if, case or a for loop within JSX. You can set a much more complex condition outside of it.
External libraries
React community has created various libraries for handling common styling tasks in React. For instance, the classnames package provides a function of the same name, used for dynamically applying class values.
There is also a popular styled-components package, which can help you create local CSS rules for components. It is commonly used in development of large scale web applications. You will often find that the knowledge of this package is necessary to get a job.
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