Read URL Query Strings for Data Prepopulation

querystrings.js

// Data pre-population
var queryStrings = decodeURIComponent(location.search).split(/[?&]/).reduce(function(total, qs) {
  total[qs.split('=')[0]] = qs.split('=')[1];
  return total;
}, {});
  
if (queryStrings) {
  var inviteeEmailValue = queryStrings['Email'];
  var inviteeFullNameValue = queryStrings['Name'];
  var inviteeMobileValue = queryStrings['mobile'];

  var inviteeEmailElem = document.getElementById('email');
  var inviteeFullNameElem = document.getElementById('full_name');
  var inviteeMobileElem = document.getElementById('mobile');

  if (inviteeEmailValue) {
    inviteeEmailElem.value = inviteeEmailValue;
    inviteeEmailElem.disabled = true;
  }

  if (inviteeFullNameValue) {
    inviteeFullNameElem.value = inviteeFullNameValue;
    inviteeFullNameElem.disabled = true;
  }

  if (inviteeMobileValue) {
    inviteeMobileElem.value = inviteeMobileValue;
    inviteeMobileElem.disabled = true;
  }
}