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/** | |
* @class Analytics | |
* @author Joshua Russell <josh.russell@holler.com.au> | |
* | |
* A wrapper class for sending Google Analytics events | |
* https://developers.google.com/analytics/devguides/collection/analyticsjs/events | |
* ga('send', 'event', [eventCategory], [eventAction], [eventLabel], [eventValue]); | |
* | |
* Usage: | |
* Add a data-ga to html elements to track `click` events | |
* <a href="/" data-ga="cta|click|Site Logo">Site Logo</a> | |
* | |
* Format: | |
* eventCategory(required)|eventAction(required)|eventLabel(required)|dynamicValue(optional) | |
* The dynamicValue is used to take the value from input fields to construct the label | |
* | |
* Events: | |
* @event analyticsRebuild | |
* - Rebuilds all click listeners | |
* - Handy when HTML is dynamically generated with `data-ga` attributes | |
*/ | |
export default class Analytics { | |
constructor(key) { | |
this.devMode = false; | |
this.key = key; | |
this.links = []; | |
this.delimiter = '|'; | |
// Append event listeners | |
window.addEventListener('Analytics.appendLink', (data) => { | |
if (!data.detail.link) return; | |
const link = document.querySelector(data.detail.link); | |
if (link && link.dataset.ga) { | |
link.addEventListener('click', this.handleClick.bind(this, link)); | |
} | |
}); | |
// Init | |
this.init(); | |
} | |
/** | |
* @function links | |
* Creates event listeners for all [data-ga] links | |
*/ | |
init() { | |
this.links = document.querySelectorAll('[data-ga]'); | |
this.links.forEach(link => { | |
link.addEventListener('click', this.handleClick.bind(this, link)); | |
}); | |
} | |
/** | |
* @function handleClick | |
* @param {HTMLElement} link | |
* @param {Event} e | |
*/ | |
handleClick(link, e) { | |
if (this.devMode) e.preventDefault(); | |
this.click(link); | |
} | |
/** | |
* @function click | |
* @param {HTMLElement} link | |
* Handles clicking on an element with [data-ga] attributes | |
* Determines the GA event data | |
* Sends the GA event | |
*/ | |
click(link) { | |
if (!window.hasOwnProperty('ga')) { | |
return console.warn('Cannot initialise Analytics without GA! — analytics.js'); | |
} | |
const parts = link.dataset.ga.split(this.delimiter); | |
let category = parts[0]; | |
let event = parts[1]; | |
let label = parts[2]; | |
// Get the value from a inputs element | |
if (parts[3]) { | |
const element = document.querySelector(parts[3]); | |
if (element.value) { | |
label += ` (${element.value})`; | |
} | |
} | |
// Send the event | |
this.send(category, event, label); | |
} | |
/** | |
* @function send | |
* @param {String} category | |
* @param {String} event | |
* @param {String} label | |
* Sends the GA Event | |
*/ | |
send(category, event, label) { | |
if (!window.hasOwnProperty('ga')) { | |
return console.warn('Google Analytics not installed correctly! — analytics.js'); | |
} | |
const trackerName = ga.getAll()[0].get('name'); | |
if (category && event && label) { | |
ga(`${trackerName}.send`, 'event', category, event, label); | |
} | |
} | |
} |
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