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How To Use canDeactivate Route Guard In Angular | Angular Tutorial
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Angular Web Development

How To Use canDeactivate Route Guard In Angular

CanDeactivate is an interface. This guard is helpful in making a decision to deactivate a route or not.  if CanDeactivate guards return true, navigation will continue or else the navigation will be canceled. Basically, this guard used to switching to one router to another. When you leave one component and then move to another component. Using a router CanDeactivate you can check if the user is willing to move to the next page.  

CanDeactivate File Setup

This blog is a clear explanation of how you can use the CanDeactivate router guard in Angular. if you are new to this, let’s set up a basic Angular CLI with the command. If you already have an Angular app, you can skip this step.

Now, lets set up a file ng new angular-canDeactive to work in this blog.  You can name your Angular app name as you wish. “angular-candeactive” is Angular app name here.

CanDeactivate Route Guard In Angular

In this case, I’ve created contact and home component. Then add the router based on navigation. Now we will create a two-component.

  1. Navigate to the home component
  2. Navigate to contact component

Now app-routing.ts file as follows,

After you configure the router file you can able to navigate the contact component. In my case home is a default. The result will look like this. 

Now we are ready to implement CanDeactivate function to contact component. Once you leave the component to execute some other functionality, it will display a confirm popup. For instance, create one angular guard file. This helps in identifying the router change. In my case, I have added can-exit.guard.ts & CanExit.ts file.  Take a look at the can-exit.guard.ts file in the display.

CanExit.ts – This file is used to return the promised value.

After you add the above files in your application configure the router file as follows. Once you are in the contact component and the move to some other component using a router that will work in the CanDeactivate router method.

Contact.component.ts file looks as follows.

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When you have set canDeactivate return value false, you are not switching another router until it’s set to true.

Now if you are trying to move from the home page to the other, it shows confirmation popup as shown in the below image. If you select OK, it will move the home to the contact page or otherwise, you will remain on the same page.

Git Link: https://github.com/agiratech-manigandan/candeactivate-angular

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Manigandan

An ideal Full Stack Developer, having around 5+ years of experience in web development arena, expertise in AngularJS, Nodejs, PHP and also scoring 6 years of experience in Networking & Window servers. A perfect all-rounder has fondness to play diverse role. he always strives to match perfection and likely remains the best in whatever role he takes.

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