It’s easy to bind CSS classes to elements in your Angular 2 templates. You provide a class name with class.className between brackets in your templates and then an expression on the right that should evaluate to true or false to determine if the class should be applied. Here’s how you would bind a single class for example:
<div [class.active]="isActive">
...
</div>
When multiple classes should potentially be added, the NgClass directive comes in really handy. NgClass should receive an object with class names as keys and expressions that evaluate to true or false as values:
<div [ngClass]="myClasses">
...
</div>
And then myClasses would be a property in the component that contains an object that looks like this:
myClasses = {
important: this.isImportant,
inactive: !this.isActive,
saved: this.isSaved,
long: this.name.length > 6
}
Of course the object can also be the return value of a method:
<div [ngClass]="setMyClasses()">
...
</div>
In the associated component class
setMyClasses() {
let classes = {
important: this.isImportant,
inactive: !this.isActive,
saved: this.isSaved,
long: this.name.length > 6
};
return classes;
}
Thanks for learning with the DigitalOcean Community. Check out our offerings for compute, storage, networking, and managed databases.
Alligator.io is a developer-focused resource that offers tutorials and insights on a wide range of modern front-end technologies, including Angular 2+, Vue.js, React, TypeScript, Ionic, and JavaScript.
This textbox defaults to using Markdown to format your answer.
You can type !ref in this text area to quickly search our full set of tutorials, documentation & marketplace offerings and insert the link!
Get paid to write technical tutorials and select a tech-focused charity to receive a matching donation.
Full documentation for every DigitalOcean product.
The Wave has everything you need to know about building a business, from raising funding to marketing your product.
Stay up to date by signing up for DigitalOcean’s Infrastructure as a Newsletter.
New accounts only. By submitting your email you agree to our Privacy Policy
Scale up as you grow — whether you're running one virtual machine or ten thousand.
Sign up and get $200 in credit for your first 60 days with DigitalOcean.*
*This promotional offer applies to new accounts only.