109 lines
3.9 KiB
JavaScript
109 lines
3.9 KiB
JavaScript
/**
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* meta_tracking.js
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* A standalone module to capture and persist Meta attribution signals (fbclid, _fbp) in cookies.
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*
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* Logic adapted for legacy environment (no React hooks).
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* - Checks URL for `fbclid` and sets `_fbc` cookie.
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* - Checks for `_fbp` cookie; if missing, generates and sets it.
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*/
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(function (window, document) {
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'use strict';
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var MetaTracking = {
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init: function () {
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var location = window.location;
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this.handleFbc(location.search);
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this.handleFbp();
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this.handleUtm(location.search);
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},
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// 1. Parsing and storing _fbc (Click ID)
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handleFbc: function (searchParams) {
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var fbclid = this.getQueryParam('fbclid', searchParams);
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if (fbclid) {
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var version = 'fb';
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var subdomainIndex = 1; // 1 = example.com
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var creationTime = new Date().getTime(); // Unix timestamp in ms
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// Format: fb.1.timestamp.id
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var fbcValue = version + '.' + subdomainIndex + '.' + creationTime + '.' + fbclid;
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this.setCookie('_fbc', fbcValue, 90);
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}
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},
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handleUtm: function (searchParams) {
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var utmParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content'];
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var self = this;
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// forEach not supported in IE8, but this is modern enough or we can use for loop
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for (var i = 0; i < utmParams.length; i++) {
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var param = utmParams[i];
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var value = self.getQueryParam(param, searchParams);
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if (value) {
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self.setCookie(param, value, 90);
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}
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}
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},
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// 2. Handling _fbp (Browser ID)
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handleFbp: function () {
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if (!this.getCookie('_fbp')) {
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var version = 'fb';
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var subdomainIndex = 1;
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var creationTime = new Date().getTime();
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var randomInt = Math.floor(Math.random() * 10000000000); // 10-digit random number
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// Format: fb.1.timestamp.randomDigits
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var fbpValue = version + '.' + subdomainIndex + '.' + creationTime + '.' + randomInt;
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this.setCookie('_fbp', fbpValue, 90);
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}
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},
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// Helper: Get query param by name
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getQueryParam: function (name, search) {
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name = name.replace(/[\[]/, '\\[').replace(/[\]]/, '\\]');
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var regex = new RegExp('[\\?&]' + name + '=([^&#]*)');
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var results = regex.exec(search);
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return results === null ? '' : decodeURIComponent(results[1].replace(/\+/g, ' '));
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},
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// Helper: Set cookie
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setCookie: function (name, value, days) {
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var expires = "";
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if (days) {
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var date = new Date();
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date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
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expires = "; expires=" + date.toUTCString();
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}
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// Ensure path is root and domain is included if needed (defaults to current host)
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document.cookie = name + "=" + (value || "") + expires + "; path=/";
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},
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// Helper: Get cookie
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getCookie: function (name) {
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var nameEQ = name + "=";
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var ca = document.cookie.split(';');
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for (var i = 0; i < ca.length; i++) {
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var c = ca[i];
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while (c.charAt(0) == ' ') c = c.substring(1, c.length);
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if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length, c.length);
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}
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return null;
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}
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};
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// Initialize on ready
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if (document.readyState === 'complete' || document.readyState === 'interactive') {
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MetaTracking.init();
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} else {
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// IE9+ support for DOMContentLoaded
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document.addEventListener('DOMContentLoaded', function () {
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MetaTracking.init();
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});
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}
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})(window, document);
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