Redirect Based of Screen Size

screen_size_redirect.js

function determineIfSmallSize(redirect_url) {

  // Detect pixel ratio for true resolution
  window.dpr = 1;
  if(window.devicePixelRatio !== undefined) {
      window.dpr = window.devicePixelRatio;
  }

  // Screen orientation - innerWidth and innerHeight works for any device and its orientation, including desktops
  window.screenOrientation = ((window.innerWidth) > (window.innerHeight)) ? 'landscape' : 'portrait';

  // Have to flip width and height in landscape orientation
  if (window.screenOrientation == 'portrait') {
      window.screenWidth  = window.screen.width * window.dpr;
      window.screenHeight = window.screen.height * window.dpr;
  } else {
      window.screenWidth  = window.screen.height * window.dpr;
      window.screenHeight = window.screen.width * window.dpr;
  }

  // Set width and height for display purposes
  window.trueScreenWidth  = window.screen.width * window.dpr;
  window.trueScreenHeight = window.screen.height * window.dpr;
  window.pixelScreenWidth  = window.screen.width;
  window.pixelScreenHeight = window.screen.height;

  if((window.trueScreenWidth <= 767 || window.trueScreenHeight <= 767) && (redirect_url !== undefined)) {
    window.location.href = redirect_url;
  }

}