plugins/qrcode/shaarli-qrcode.js

   1 /** @licstart  The following is the entire license notice for the
   2  *  JavaScript code in this page.
   3  *
   4  *   Copyright: (c) 2011-2015 Sébastien SAUVAGE <sebsauvage@sebsauvage.net>
   5  *              (c) 2011-2017 The Shaarli Community, see AUTHORS
   6  *
   7  *   This software is provided 'as-is', without any express or implied warranty.
   8  *   In no event will the authors be held liable for any damages arising from
   9  *   the use of this software.
  10  *
  11  *   Permission is granted to anyone to use this software for any purpose,
  12  *   including commercial applications, and to alter it and redistribute it
  13  *   freely, subject to the following restrictions:
  14  *
  15  *   1. The origin of this software must not be misrepresented; you must not
  16  *   claim that you wrote the original software. If you use this software
  17  *   in a product, an acknowledgment in the product documentation would
  18  *   be appreciated but is not required.
  19  *
  20  *   2. Altered source versions must be plainly marked as such, and must
  21  *   not be misrepresented as being the original software.
  22  *
  23  *   3. This notice may not be removed or altered from any source distribution.
  24  *
  25  *  @licend  The above is the entire license notice
  26  *  for the JavaScript code in this page.
  27  */
  28
  29 // Show the QR-Code of a permalink (when the QR-Code icon is clicked).
  30 function showQrCode(caller,loading)
  31 {
  32     // Dynamic javascript lib loading: We only load qr.js if the QR code icon is clicked:
  33     if (typeof(qr) == 'undefined') // Load qr.js only if not present.
  34     {
  35         if (!loading)  // If javascript lib is still loading, do not append script to body.
  36         {
  37             var element = document.createElement("script");
  38             element.src = "plugins/qrcode/qr-1.1.3.min.js";
  39             document.body.appendChild(element);
  40         }
  41         setTimeout(function() { showQrCode(caller,true);}, 200); // Retry in 200 milliseconds.
  42         return false;
  43     }
  44
  45     // Remove previous qrcode if present.
  46     removeQrcode();
  47
  48     // Build the div which contains the QR-Code:
  49     var element = document.createElement('div');
  50     element.id = 'permalinkQrcode';
  51
  52         // Make QR-Code div commit sepuku when clicked:
  53     if ( element.attachEvent ){
  54         element.attachEvent('onclick', 'this.parentNode.removeChild(this);' );
  55
  56     } else {
  57         // Damn IE
  58         element.setAttribute('onclick', 'this.parentNode.removeChild(this);' );
  59     }
  60
  61     // Build the QR-Code:
  62     var image = qr.image({size: 8,value: caller.dataset.permalink});
  63     if (image)
  64     {
  65         element.appendChild(image);
  66         element.innerHTML += "<br>Click to close";
  67         caller.parentNode.appendChild(element);
  68
  69         // Show the QRCode
  70         qrcodeImage = document.getElementById('permalinkQrcode');
  71         // Workaround to deal with newly created element lag for transition.
  72         window.getComputedStyle(qrcodeImage).opacity;
  73         qrcodeImage.className = 'show';
  74     }
  75     else
  76     {
  77         element.innerHTML = "Your browser does not seem to be HTML5 compatible.";
  78     }
  79     return false;
  80 }
  81
  82 // Remove any displayed QR-Code
  83 function removeQrcode()
  84 {
  85     var elem = document.getElementById('permalinkQrcode');
  86     if (elem) {
  87         elem.parentNode.removeChild(elem);
  88     }
  89     return false;
  90 }