-$(document).ready(function() {
- $('a.qrcode').click(function(){
- hide_qrcode();
- var link = $(this).attr('href');
- $(this).after('<div class="qrcode" onclick="hide_qrcode();return false;"><img src="'+link+'#" width="200" height="200"><br>click to close</div>');
- });
-});
-function hide_qrcode() { $('div.qrcode').remove(); }
+// 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;
+}