Created
October 12, 2017 15:00
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Simple Code-128 (128B) barcode SVG generator, in vanilla JS
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var Barcode128Svg = (function () { | |
function Barcode128Svg(input) { | |
this.input = input; | |
this.factor = 2; | |
this.height = 75; | |
} | |
var lookup = {}, data = "212222222122222221121223121322131222122213122312132212221213221312231212112232122132122231113222123122123221223211221132221231213212223112312131311222321122321221312212322112322211212123212321232121111323131123131321112313132113132311211313231113231311112133112331132131113123113321133121313121211331231131213113213311213131311123311321331121312113312311332111314111221411431111111224111422121124121421141122141221112214112412122114122411142112142211241211221114413111241112134111111242121142121241114212124112124211411212421112421211212141214121412121111143111341131141114113114311411113411311113141114131311141411131".split(/(\d{6})/).filter(function (s) { return !!s }); | |
for (var i = 32; i < 127; i++) | |
lookup[String.fromCharCode(i)] = [i - 32, data[i - 32]]; | |
Barcode128Svg.prototype.toString = function () { | |
var h = this.height, f = this.factor; | |
var svg = "\n", x = 10 * f, sum = 104; | |
function draw(d) { | |
d.split("").forEach(function (n, i) { | |
svg += (i % 2) ? "\n" : | |
"<rect x=\"" + x + "\" y=\"0\" width=\"" + (+n * f) + | |
"\" height=\"" + h + "\" />"; | |
x += +n * f; | |
}); | |
} | |
draw("211214"); | |
this.input.split("").forEach(function (c, i) { | |
var l = lookup[c] || [0, ""]; | |
sum += l[0] * (i + 1); | |
draw(l[1]); | |
}); | |
draw(data[sum % 103]); | |
draw("23311129"); | |
return "<svg xmlns=\"http://www.w3.org/2000/svg\" " + | |
"xmlns:xlink=\"http://www.w3.org/1999/xlink\" version=\"1.1\" " + | |
"height=\"" + h + "px\" viewBox=\"0,0," + (x + f) + "," + h + | |
"\">" + svg + "</svg>"; | |
}; | |
Barcode128Svg.prototype.toDataUri = function () { | |
return "data:image/svg+xml;base64," + btoa(this.toString()); | |
}; | |
return Barcode128Svg; | |
})(); |
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