-// Remove any displayed QR-Code
-function remove_qrcode()
-{
- var elem = document.getElementById("permalinkQrcode");
- if (elem) elem.parentNode.removeChild(elem);
- return false;
-}
-
-function isCanvasSupported(){
- var elem = document.createElement('canvas');
- return !!(elem.getContext && elem.getContext('2d'));
-}
-
-// Show the QR-Code of a permalink (when the QR-Code icon is clicked).
-function showQrCode(caller,loading)
-{
- if( !isCanvasSupported() ) return true;
-
- // Dynamic javascript lib loading: We only load qr.js if the QR code icon is clicked:
- if (typeof(qr)=='undefined') // Load qr.js only if not present.
- {
- loading = typeof loading !== 'undefined' ? loading : false;
- if (!loading) // If javascript lib is still loading, do not append script to body.
- {
- var element = document.createElement("script");
- element.src = "inc/qr.min.js";
- document.body.appendChild(element);
- }
- setTimeout(function() { showQrCode(caller,true);}, 200); // Retry in 200 milliseconds.
- return false;
- }
-
- // Remove previous qrcode if present.
- remove_qrcode();
-
- // Build the div which contains the QR-Code:
- var element = document.createElement('div');
- element.id="permalinkQrcode";
-
- // Make QR-Code div commit sepuku when clicked:
- element.addEventListener('click', remove_qrcode ); // Works on every canvas supported browser
-
- // Build the QR-Code:
- var image = qr.image({size: 8,value: caller.getAttribute('data-permalink')});
- if (image)
- {
- element.appendChild(image);
- element.innerHTML+= "<br>Click to close";
- caller.parentNode.appendChild(element);
- }
- else
- {
- element.innerHTML="Your browser does not seem to be HTML5 compatible.";
- }
- return false;
-}