Tutorial

*ngIf Directive in Angular 2

Published on October 8, 2016
Default avatar

By Alligator.io

*ngIf Directive in Angular 2

While we believe that this content benefits our community, we have not yet thoroughly reviewed it. If you have any suggestions for improvements, please let us know by clicking the “report an issue“ button at the bottom of the tutorial.

NgIf is a built-in template directive that adds or removes parts of the DOM depending on if the expression passed to it is true or false:

<div *ngIf="userHasPet">
  {{ user.pet.name }}
</div>

In the above, if userHasPet is true, then the div will be included in the DOM (it will be on the page), and if userHasPet is false, the div will be removed from the DOM (it won’t be on the page).

Like with *ngFor, the * character allows to create a template and allows for a shortcut to this syntax: template=“ngIf userHasPet”.

You can also pass in a more complex expression to *ngIf:

<div *ngIf="user.name.length > 6 && user.name.length < 10">
  Long name {{ user.name }}, but not too long!
</div>

See Also

Thanks for learning with the DigitalOcean Community. Check out our offerings for compute, storage, networking, and managed databases.

Learn more about us


About the authors
Default avatar
Alligator.io

author

Still looking for an answer?

Ask a questionSearch for more help

Was this helpful?
 
Leave a comment


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!

Try DigitalOcean for free

Click below to sign up and get $200 of credit to try our products over 60 days!

Sign up

Join the Tech Talk
Success! Thank you! Please check your email for further details.

Please complete your information!

Get our biweekly newsletter

Sign up for Infrastructure as a Newsletter.

Hollie's Hub for Good

Working on improving health and education, reducing inequality, and spurring economic growth? We'd like to help.

Become a contributor

Get paid to write technical tutorials and select a tech-focused charity to receive a matching donation.

Welcome to the developer cloud

DigitalOcean makes it simple to launch in the cloud and scale up as you grow — whether you're running one virtual machine or ten thousand.

Learn more
DigitalOcean Cloud Control Panel