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

If you are a web developer with basic knowledge of JavaScript and want to take on Web 2.0, build real-time applications, or simply want to write a complete application using only JavaScript and HTML/CSS, this is the book for you. This book is based on Meteor 1.0.
Table of Contents (15 chapters)
14
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...