JS generate barcode function sample code

This article mainly introduces the function of JS to generate one-dimensional codes (barcodes), and analyzes the specific steps and related operating techniques of JS plug-in to generate barcodes in the form of a complete example. Friends in need can refer to this article

The example describes the method of generating one-dimensional code (barcode) function using JS. Share it with everyone for your reference, the details are as follows:

1. js code:

(function() {
 if (!exports) var exports = window;
 var BARS    = [212222,222122,222221,121223,121322,131222,122213,122312,132212,221213,221312,231212,112232,122132,122231,113222,123122,123221,223211,221132,221231,213212,223112,312131,311222,321122,321221,312212,322112,322211,212123,212321,232121,111323,131123,131321,112313,132113,132311,211313,231113,231311,112133,112331,132131,113123,113321,133121,313121,211331,231131,213113,213311,213131,311123,311321,331121,312113,312311,332111,314111,221411,431111,111224,111422,121124,121421,141122,141221,112214,112412,122114,122411,142112,142211,241211,221114,413111,241112,134111,111242,121142,121241,114212,124112,124211,411212,421112,421211,212141,214121,412121,111143,111341,131141,114113,114311,411113,411311,113141,114131,311141,411131,211412,211214,211232,23311120]
  , START_BASE = 38
  , STOP    = 106 ;
 function code128(code, barcodeType) {
  if (arguments.length<2)
     barcodeType = code128Detect(code);
  if (barcodeType==&#39;C&#39; && code.length%2==1)
    code = &#39;0&#39;+code;
  var a = parseBarcode(code, barcodeType);
  return bar2html(a.join(&#39;&#39;)) + &#39;<label>&#39; + code + &#39;</label>&#39;;
 }
 function bar2html(s) {
  for(var pos=0, sb=[]; pos<s.length; pos+=2) {
   sb.push(&#39;<p class="bar&#39; + s.charAt(pos) + &#39; space&#39; + s.charAt(pos+1) + &#39;"></p>&#39;);
  }
  return sb.join(&#39;&#39;);
 }
 function code128Detect(code) {
  if (/^[0-9]+$/.test(code)) return &#39;C&#39;;
  if (/[a-z]/.test(code)) return &#39;B&#39;;
  return &#39;A&#39;;
 }
 function parseBarcode(barcode, barcodeType) {
  var bars = [];
  bars.add = function(nr) {
   var nrCode = BARS[nr];
   this.check = this.length==0 ? nr : this.check + nr*this.length;
   this.push( nrCode || ("UNDEFINED: "+nr+"->"+nrCode) );
  };
  bars.add(START_BASE + barcodeType.charCodeAt(0));
  for(var i=0; i<barcode.length; i++) {
   var code = barcodeType==&#39;C&#39; ? +barcode.substr(i++, 2) : barcode.charCodeAt(i);
   converted = fromType[barcodeType](code);
   if (isNaN(converted) || converted<0 || converted>106) throw new Error("Unrecognized character ("+code+") at position "+i+" in code &#39;"+barcode+"&#39;.");
   bars.add( converted );
  }
  bars.push(BARS[bars.check % 103], BARS[STOP]);
  return bars;
 }
 var fromType = {
  A: function(charCode) {
   if (charCode>=0 && charCode<32) return charCode+64;
   if (charCode>=32 && charCode<96) return charCode-32;
   return charCode;
  },
  B: function(charCode) {
   if (charCode>=32 && charCode<128) return charCode-32;
   return charCode;
  },
  C: function(charCode) {
   return charCode;
  }
 };
 //--| Export
 exports.code128 = code128;
})();
/*
  showp：代表需要显示的pID，
  textVlaue ： 代表需要生成的值，
  barcodeType：代表生成类型(A、B、C)三种类型
*/
function createBarcode(showp,textValue,barcodeType){
  var pElement = document.getElementById(showp);
    pElement.innerHTML = code128(textValue,barcodeType);
}

2.css code is as follows:

.barcode {
 float:left;
 clear:both;
 padding: 0 10px; /*quiet zone*/
 overflow:auto;
 height:0.5in; /*size*/
}
.right { float:right; }
.barcode + * { clear:both; }
.barcode p {
 float:left;
 height: 0.35in; /*size*/
}
.barcode .bar1 { border-left:1px solid black; }
.barcode .bar2 { border-left:2px solid black; }
.barcode .bar3 { border-left:3px solid black; }
.barcode .bar4 { border-left:4px solid black; }
.barcode .space0 { margin-right:0 }
.barcode .space1 { margin-right:1px }
.barcode .space2 { margin-right:2px }
.barcode .space3 { margin-right:3px }
.barcode .space4 { margin-right:4px }
.barcode label {
 clear:both;
 display:block;
 text-align:center;
 font: 0.125in/100% helvetica; /*size*/
}
/*** bigger ******************************************/
.barcode2 {
 float:left;
 clear:both;
 padding: 0 10px; /*quiet zone*/
 overflow:auto;
 height:1in; /*size*/
}
.barcode2 + * { clear:both; }
.barcode2 p {
 float:left;
 height: 0.7in; /*size*/
}
.barcode2 .bar1 { border-left:2px solid black; }
.barcode2 .bar2 { border-left:4px solid black; }
.barcode2 .bar3 { border-left:6px solid black; }
.barcode2 .bar4 { border-left:8px solid black; }
.barcode2 .space0 { margin-right:0 }
.barcode2 .space1 { margin-right:2px }
.barcode2 .space2 { margin-right:4px }
.barcode2 .space3 { margin-right:6px }
.barcode2 .space4 { margin-right:8px }
.barcode2 label {
 clear:both;
 display:block;
 text-align:center;
 font: 0.250in/100% helvetica; /*size*/
}

3. The html code is as follows:

<html>
 <head>
  <title>QR-Code Clock</title>
  <link rel="stylesheet" href="code128.css" type="text/css" media="screen" charset="utf-8">
  <script src="code128.js" type="text/javascript" charset="utf-8"></script>
    <script type="text/javascript">
(function(pId) {
 var pElement ,oldOnLoad = window.onload ;
 function getTimeString() {
  var pad = function(n) { return n < 10 ? &#39;0&#39; + n.toString(10) : n.toString(10); }
    ,dt = new Date();
  return [pad(dt.getHours()), pad(dt.getMinutes()), pad(dt.getSeconds())].join(&#39;:&#39;);
 }
 function UpdateClock() {
  var timeText = getTimeString();
  pElement.innerHTML = code128(timeText);
 }
 window.onload = function() {
  pElement = document.getElementById(pId);
  UpdateClock();
  setInterval(UpdateClock, 1000);
  if (typeof oldOnLoad == &#39;function&#39;) oldOnLoad.apply(this, arguments);
 }
})(&#39;p1&#39;);
  </script>
 </head>
 <body>
  <input type="button" value ="生成" onclick="createBarcode(&#39;p128&#39;,&#39;12345678&#39;,&#39;B&#39;);"/>
   <p class="barcode2" id="p128"></p>
   <p class="barcode2" id="p1"></p>
 </body>
</html>

The running effect is as follows:

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