GTM Ajax Listener

<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', ':');

        // [Added by Praba from MeasureSchool] Get form inputs & push it to data layer
        var inputs = document.querySelectorAll('input');
        var formInputs = {};
        for (var i = 0; i < inputs.length; i++) {
          formInputs[inputs[i].id] = inputs[i].value;
        }

        // 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 || '',
            formInputs: formInputs
          },
        });
      });
    }

    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>