95 lines
3.4 KiB
JavaScript
95 lines
3.4 KiB
JavaScript
/**
|
|
* meta_tracking.js
|
|
* A standalone module to capture and persist Meta attribution signals (fbclid, _fbp) in cookies.
|
|
*
|
|
* Logic adapted for legacy environment (no React hooks).
|
|
* - Checks URL for `fbclid` and sets `_fbc` cookie.
|
|
* - Checks for `_fbp` cookie; if missing, generates and sets it.
|
|
*/
|
|
|
|
(function(window, document) {
|
|
'use strict';
|
|
|
|
var MetaTracking = {
|
|
init: function() {
|
|
var location = window.location;
|
|
this.handleFbc(location.search);
|
|
this.handleFbp();
|
|
},
|
|
|
|
// 1. Parsing and storing _fbc (Click ID)
|
|
handleFbc: function(searchParams) {
|
|
var fbclid = this.getQueryParam('fbclid', searchParams);
|
|
|
|
if (fbclid) {
|
|
var version = 'fb';
|
|
var subdomainIndex = 1; // 1 = example.com
|
|
var creationTime = new Date().getTime(); // Unix timestamp in ms
|
|
|
|
// Format: fb.1.timestamp.id
|
|
var fbcValue = version + '.' + subdomainIndex + '.' + creationTime + '.' + fbclid;
|
|
|
|
this.setCookie('_fbc', fbcValue, 90);
|
|
}
|
|
},
|
|
|
|
// 2. Handling _fbp (Browser ID)
|
|
handleFbp: function() {
|
|
if (!this.getCookie('_fbp')) {
|
|
var version = 'fb';
|
|
var subdomainIndex = 1;
|
|
var creationTime = new Date().getTime();
|
|
var randomInt = Math.floor(Math.random() * 10000000000); // 10-digit random number
|
|
|
|
// Format: fb.1.timestamp.randomDigits
|
|
var fbpValue = version + '.' + subdomainIndex + '.' + creationTime + '.' + randomInt;
|
|
|
|
this.setCookie('_fbp', fbpValue, 90);
|
|
}
|
|
},
|
|
|
|
// Helper: Get query param by name
|
|
getQueryParam: function(name, search) {
|
|
name = name.replace(/[\[]/, '\\[').replace(/[\]]/, '\\]');
|
|
var regex = new RegExp('[\\?&]' + name + '=([^&#]*)');
|
|
var results = regex.exec(search);
|
|
return results === null ? '' : decodeURIComponent(results[1].replace(/\+/g, ' '));
|
|
},
|
|
|
|
// Helper: Set cookie
|
|
setCookie: function(name, value, days) {
|
|
var expires = "";
|
|
if (days) {
|
|
var date = new Date();
|
|
date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
|
|
expires = "; expires=" + date.toUTCString();
|
|
}
|
|
// Ensure path is root and domain is included if needed (defaults to current host)
|
|
document.cookie = name + "=" + (value || "") + expires + "; path=/";
|
|
},
|
|
|
|
// Helper: Get cookie
|
|
getCookie: function(name) {
|
|
var nameEQ = name + "=";
|
|
var ca = document.cookie.split(';');
|
|
for(var i=0;i < ca.length;i++) {
|
|
var c = ca[i];
|
|
while (c.charAt(0) == ' ') c = c.substring(1,c.length);
|
|
if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
|
|
}
|
|
return null;
|
|
}
|
|
};
|
|
|
|
// Initialize on ready
|
|
if (document.readyState === 'complete' || document.readyState === 'interactive') {
|
|
MetaTracking.init();
|
|
} else {
|
|
// IE9+ support for DOMContentLoaded
|
|
document.addEventListener('DOMContentLoaded', function() {
|
|
MetaTracking.init();
|
|
});
|
|
}
|
|
|
|
})(window, document);
|