Rerunning functions reactively

To rerun functions based on session changes, Meteor provides the Tracker.autorun() function, which we used before to change the lazy load subscription.

The Tracker.autorun() function will make every function we pass to it reactive. To see a simple example, we will create a function that will alert a text every time the function reruns.

Note

The Tracker package is what the session uses under the hood to make the reactivity work. In Chapter 9, Advanced Reactivity, we will take a deeper look at this package.

Perform the following steps to rerun functions reactively:

1. Let's create a new file called main.js, but this time in the root of the my-meteor-blog folder, with the following content:

   if(Meteor.isClient) {
   
       Tracker.autorun(function(){
           var example = Session.get('mySessionExample'); 
           alert(example);
       });
   }

   Note

   We will need the main.js file in later chapters. Therefore, we created it in the root folder, making it accessible on the client and the...