Exploring Meteor's JavaScript Design Patterns

My Meteor project has grown to about 800 lines of code and it's starting to become unwieldy. Today, I decided to clean things up by modularizing the code, but now I'm encountering some errors that I need help resolving.

Here's a specific example:

I'm using d3 to create a force layout in my project. In one of my files (/client/views/force/forceLayout.js), I have defined the following variable:

var force = d3.layout.force()

I've separated the controls for this force layout into their own .html and .js files. Here is an excerpt from one of those files (/client/views/force/controls/sliders/charge.js):

initChargeSlider = function() {
    d3.select("#charge-slider")
        .call(d3.slider()
            .min(-301)
            .max(-1)
            .step(5)
            .value(Session.get("charge"))
            .on("slide", function(evt, value) {
                Session.set("charge", value);
                // force.stop();
                force = force.charge(value);
                force.start();
            }));
}

Template.charge.rendered = function() {
    initChargeSlider();
};

The issue arises when loading these files due to Meteor's directory loading order. Specifically, I get an error at force = force.charge(value) because forceLayout.js hasn't instantiated force yet.

I would like to know the best approach to handling this situation. Rearranging files and changing loading orders would undo the modularization work I've done so far. I'm considering using a singleton, object, or monad, but I'm unsure of which option would be most suitable and why. Any guidance on resolving these errors would be greatly appreciated.

Thank you,

Chet

Answer №1

When working with Meteor versions prior to 0.6.5, it was necessary to run files without wrapping them inside a function wrapper like

(function() { /* your code */ })()
.

This requirement still applies if you choose to place your files in the client/compatibility folder:

Some JavaScript libraries only function correctly when placed in the client/compatibility subdirectory. Files located here are executed without being encapsulated in a new variable scope, which results in each top-level var declaration defining a global variable. Additionally, these files are executed before other client-side JavaScript files.

In more recent versions of Meteor, there is a stricter approach towards global variables, requiring explicit declaration. Therefore,

window.force = d3.layout.force()

or even

this.force = d3.layout.force(); // this === window in global context.

would resolve this issue.

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