Book Image

Building Single-page Web Apps with Meteor

By : Fabian Vogelsteller
Book Image

Building Single-page Web Apps with Meteor

By: Fabian Vogelsteller

Overview of this book

Table of Contents (21 chapters)
Building Single-page Web Apps with Meteor
Credits
About the Author
Acknowledgments
About the Reviewers
www.PacktPub.com
Preface
Index

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...