Function onHashChange

history.js:882–910

* Event handler function changes the hash in the address bar * * @param {Event} event * @return void

(event)

   * @return void
   */
  function onHashChange(event) {
    // https://github.com/devote/HTML5-History-API/issues/46
    var fireNow = lastURL;
    // new value to lastURL
    lastURL = windowLocation.href;
    // if not empty fireNow, otherwise skipped the current handler event
    if (fireNow) {
      // if checkUrlForPopState equal current url, this means that the event was raised popstate browser
      if (checkUrlForPopState !== windowLocation.href) {
        // otherwise,
        // the browser does not support popstate event or just does not run the event by changing the hash.
        firePopState();
      }
      // current event object
      event = event || global.event;

      var oldURLObject = parseURL(fireNow, true);
      var newURLObject = parseURL();
      // HTML4 browser not support properties oldURL/newURL
      if (!event.oldURL) {
        event.oldURL = oldURLObject._href;
        event.newURL = newURLObject._href;
      }
      if (oldURLObject._hash !== newURLObject._hash) {
        // if current hash not equal previous hash
        dispatchEvent(event);
      }
    }
  }

  /**
   * The event handler is fully loaded document