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- /*
- * iOS Launch Image Loader v1.1.1 @ GDibble
- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
- * Browser downloads all meta-tagged images, thus only append 1 meta tag to
- * save download time and provide the fastest loading mobile experience.
- *
- * Files must live in '/img/ios/' and named:
- * startup-2048x1496.png Landscape Retina iPads
- * startup-1536x2008.png Portrait Retina iPads
- * startup-1024x748.png Landscape iPad 1 & 2
- * startup-768x1004.png Portrait iPad 1 & 2
- * startup-1242x2148.png Portrait Retina iPhone 6+
- * startup-750x1294.png Portrait Retina iPhone 6
- * startup-640x1096.png Portrait Retina iPhone 5
- * startup-640x920.png Portrait Retina iPhone 4
- * startup-320x460.png Portrait iPhone & iPod Touch
- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
- (function () {
- function dynamicLaunchImage(prefix, extension) {
- var resolution;
- if (navigator.platform === 'iPad') {
- if (window.devicePixelRatio === 2) {
- //Retina iPads
- if (window.orientation === 90 || window.orientation === -90) {
- resolution = '2048x1496';
- } else {
- resolution = '1536x2008';
- }
- } else {
- //iPad 1 & 2
- if (window.orientation === 90 || window.orientation === -90) {
- resolution = '1024x748';
- } else {
- resolution = '768x1004';
- }
- }
- } else if (window.devicePixelRatio === 3) {
- //Retina iPhone 6+
- resolution = '1242x2148';
- } else if (window.devicePixelRatio === 2) {
- if (window.screen.height === 667) {
- //Retina iPhone 6
- resolution = '750x1294';
- } else if (window.screen.height === 568) {
- //Retina iPhone 5
- resolution = '640x1096';
- } else {
- //Retina iPhone 4
- resolution = '640x920';
- }
- } else {
- //iPhone & iPod Touch
- resolution = '320x460';
- }
- return prefix + resolution + '.' + extension;
- }
- var head = 'head';
- var headTag = document.getElementsByTagName(head);
- var linkTag = document.createElement('link');
- linkTag.setAttribute('rel', 'apple-touch-startup-image');
- linkTag.href = '/img/ios/' + dynamicLaunchImage('startup-', 'png');
- if (!headTag.length) { //check if head tag exists, create otherwise
- headTag = [ document.createElement(head) ];
- document.body.appendChild(headTag[0]);
- }
- headTag[0].appendChild(linkTag);
- })();
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