二维码JS之jquery.qrcode.js

Posted 2020-12-29 lxxwyhhsh

(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();
jQuery(element).appendTo(this);
});
};
})( jQuery );