☰

jquery.qrcode.js

The original author jeromeetienne https://github.com/jeromeetienne/jquery-qrcode

Version vom 30.07.2017. Aktuellste Version

Dieses Skript sollte nicht direkt installiert werden. Es handelt sich hier um eine Bibliothek für andere Skripte, welche über folgenden Befehl in den Metadaten eines Skriptes eingebunden wird // @require https://update.greatest.deepsurf.us/scripts/31885/208853/jqueryqrcodejs.js 

(function( $ ){
	$.fn.qrcode = function(options) {
		// if options is string, 
		if( typeof options === 'string' ){
			options	= { text: options };
		}

		// set default values
		// typeNumber < 1 for automatic calculation
		options	= $.extend( {}, {
			render		: "canvas",
			width		: 256,
			height		: 256,
			typeNumber	: -1,
			correctLevel	: QRErrorCorrectLevel.H,
                        background      : "#ffffff",
                        foreground      : "#000000"
		}, options);

		var createCanvas	= function(){
			// create the qrcode itself
			var qrcode	= new QRCode(options.typeNumber, options.correctLevel);
			qrcode.addData(options.text);
			qrcode.make();

			// create canvas element
			var canvas	= document.createElement('canvas');
			canvas.width	= options.width;
			canvas.height	= options.height;
			var ctx		= canvas.getContext('2d');

			// compute tileW/tileH based on options.width/options.height
			var tileW	= options.width  / qrcode.getModuleCount();
			var tileH	= options.height / qrcode.getModuleCount();

			// draw in the canvas
			for( var row = 0; row < qrcode.getModuleCount(); row++ ){
				for( var col = 0; col < qrcode.getModuleCount(); col++ ){
					ctx.fillStyle = qrcode.isDark(row, col) ? options.foreground : options.background;
					var w = (Math.ceil((col+1)*tileW) - Math.floor(col*tileW));
					var h = (Math.ceil((row+1)*tileW) - Math.floor(row*tileW));
					ctx.fillRect(Math.round(col*tileW),Math.round(row*tileH), w, h);  
				}	
			}
			// return just built canvas
			return canvas;
		}

		// from Jon-Carlos Rivera (https://github.com/imbcmdth)
		var createTable	= function(){
			// create the qrcode itself
			var qrcode	= new QRCode(options.typeNumber, options.correctLevel);
			qrcode.addData(options.text);
			qrcode.make();
			
			// create table element
			var $table	= $('<table></table>')
				.css("width", options.width+"px")
				.css("height", options.height+"px")
				.css("border", "0px")
				.css("border-collapse", "collapse")
				.css('background-color', options.background);
		  
			// compute tileS percentage
			var tileW	= options.width / qrcode.getModuleCount();
			var tileH	= options.height / qrcode.getModuleCount();

			// draw in the table
			for(var row = 0; row < qrcode.getModuleCount(); row++ ){
				var $row = $('<tr></tr>').css('height', tileH+"px").appendTo($table);
				
				for(var col = 0; col < qrcode.getModuleCount(); col++ ){
					$('<td></td>')
						.css('width', tileW+"px")
						.css('background-color', qrcode.isDark(row, col) ? options.foreground : options.background)
						.appendTo($row);
				}	
			}
			// return just built canvas
			return $table;
		}
  

		return this.each(function(){
			var element	= options.render == "canvas" ? createCanvas() : createTable();
			$(element).appendTo(this);
		});
	};
})( jQuery );