hide_addressbar.js

define(function() {
  var bodyTag
    , win = window
    , doc = document
    , docElement = doc.documentElement

  function hideAddressBar(isPad) {
    if (screen.width > 980 || screen.height > 980) { return }
    if (win.navigator.standalone === true) { return }

    // Page zoom or vertical scrollbars
    if (win.innerWidth - docElement.clientWidth > 1) { return }

    if (isPad === true
      && (docElement.scrollHeight <= docElement.clientHeight)) {
        // Extend body height to overflow and cause scrolling
        bodyTag = doc.getElementsByTagName('body')[0]

        // Viewport height at fullscreen
        bodyTag.style.height = docElement.clientWidth
          / screen.width * screen.height + 'px'
    }

    setTimeout(function() {
      if (win.pageYOffset !== 0) { return }
      win.scrollTo(0, 1)

      // Reset body height and scroll
      if (bodyTag !== undefined) {
        bodyTag.style.height = win.innerHeight + 'px'
      }

      win.scrollTo(0, 0)
    }, 600)

  }

  if (win.addEventListener) {
    win.addEventListener('orientationchange', hideAddressBar)
  }

  return hideAddressBar
})