Copied from old Lunametrics post http://www.lunametrics.com/blog/2015/08/27/ajax-event-listener-google-tag-manager/
<script id="gtm-jq-ajax-listen" type="text/javascript">
(function() {
'use strict';
var $;
var n = 0;
init();
function init(n) {
// Ensure jQuery is available before anything
if (typeof jQuery !== 'undefined') {
// Define our $ shortcut locally
$ = jQuery;
bindToAjax();
// Check for up to 10 seconds
} else if (n < 20) {
n++;
setTimeout(init, 500);
}
}
function bindToAjax() {
$(document).bind('ajaxComplete', function(evt, jqXhr, opts) {
// Create a fake a element for magically simple URL parsing
var fullUrl = document.createElement('a');
fullUrl.href = opts.url;
// IE9+ strips the leading slash from a.pathname because who wants to get home on time Friday anyways
var pathname = fullUrl.pathname[0] === '/' ? fullUrl.pathname : '/' + fullUrl.pathname;
// Manually remove the leading question mark, if there is one
var queryString = fullUrl.search[0] === '?' ? fullUrl.search.slice(1) : fullUrl.search;
// Turn our params and headers into objects for easier reference
var queryParameters = objMap(queryString, '&', '=', true);
var headers = objMap(jqXhr.getAllResponseHeaders(), '\n', ':');
// Blindly push to the dataLayer because this fires within GTM
dataLayer.push({
'event': 'ajaxComplete',
'attributes': {
// Return empty strings to prevent accidental inheritance of old data
'type': opts.type || '',
'url': fullUrl.href || '',
'queryParameters': queryParameters,
'pathname': pathname || '',
'hostname': fullUrl.hostname || '',
'protocol': fullUrl.protocol || '',
'fragment': fullUrl.hash || '',
'statusCode': jqXhr.status || '',
'statusText': jqXhr.statusText || '',
'headers': headers,
'timestamp': evt.timeStamp || '',
'contentType': opts.contentType || '',
// Defer to jQuery's handling of the response
'response': (jqXhr.responseJSON || jqXhr.responseXML || jqXhr.responseText || '')
}
});
});
}
function objMap(data, delim, spl, decode) {
var obj = {};
// If one of our parameters is missing, return an empty object
if (!data || !delim || !spl) {
return {};
}
var arr = data.split(delim);
var i;
if (arr) {
for (i = 0; i < arr.length; i++) {
// If the decode flag is present, URL decode the set
var item = decode ? decodeURIComponent(arr[i]) : arr[i];
var pair = item.split(spl);
var key = trim_(pair[0]);
var value = trim_(pair[1]);
if (key && value) {
obj[key] = value;
}
}
}
return obj;
}
// Basic .trim() polyfill
function trim_(str) {
if (str) {
return str.replace(/^[\s\uFEFF\xA0]+|[\s\uFEFF\xA0]+$/g, '');
}
}
})();
/*
* v0.1.0
* Created by the Google Analytics consultants at http://www.lunametrics.com
* Written by @notdanwilkerson
* Documentation: http://www.lunametrics.com/blog/2015/08/27/ajax-event-listener-google-tag-manager/
* Licensed under the Creative Commons 4.0 Attribution Public License
*/
</script>