2 methods for binding and unbinding window.onbeforeunload event

window-prevent-reload.js

  var windowReloadBind = function(message) {
    window.onbeforeunload = function(event) {
      if (message.length === 0) {
        message = '';
      }
      
      if (typeof event == 'undefined') {
        event = window.event;
      }
      if (event) {
        event.returnValue = message;
      }
      return message;
    }
  };
  
  var windowReloadUnBind = function() {
    window.onbeforeunload = function() {
      return null;
    };
  };