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Description

How to center a code 128 barcode, valid for code B, code C, and Function 1 characters, with the exception of "~".

How to Center a Code128 Barcode using Java Script

Use the following Script, but replace 'CODE128' with the name of your data input field.

Align the width of the label is required. This can be a non-printing element and must be named BAR_WIDTH

Function 1 character can be passed in the data using [FNC1].

If you will need to encode a "~" character in your data you will need to choose another ASCII character that will NOT be in your data to use as a place holder in the script.  

Script
// Barcode Centering Script
// CENTER CODE 128 BARCODE
//
// L = (11C + 24)X  
// where 
// C = total number of characters
// X = x-dim/1000
// L = Length of symbol
// collect the necessary information
var xDim = String(label.fields.field.(@name == 'CODE128').barcode.@barLineXDim);
var labelWidth=Number(label.fields.field.(@name == 'BAR_WIDTH').@lineLength); // a nonprinting line that is the width of the label
var barcodeData = String(label.fields.field.(@name == 'CODE128').@data);
var func1 = label.fields.field.(@name == "Func1").@data; // a field with formula data source with only FNC1() in the formula
barcodeData = barcodeData.replace(/\[FNC1\]/g,"~"); // replace FNC1 calls in the data with ~ for parsing
var barcode=barcodeData.split(""); // all barcode data to array for analysis
var numcount=0;
var startCode="";
var barcodeL=0; //Number of barcode units
for (i=0;i<barcode.length;i++){
 if (isNaN(barcode[i])==false){
  numcount+=1;
  if (i==barcode.length-1){ 
   // last character is numeric
   if (numcount==i-1){
    // barcode began with a string of numbers
    if (numcount%2==0){ 
     // even number - half the count
     barcodeL+=(numcount/2); 
    }
    else{
     // odd number - half the count and one for remaining number and one for startCode change from C to B
     barcodeL+=Math.floor(numcount/2)+2;
    }
   }
   else if(numcount>=4){
    if (numcount%2==0){ 
     // even number - half the count add one for startCode change B to C
     barcodeL+=(numcount/2)+1;
    }
    else{
     // odd number - half the count and one for remaining number and for startCode change B to C and one for startCode change C to B
     barcodeL+=Math.floor(numcount/2)+3;
    }
   }
   else if(numcount!=0){
    barcodeL+=numcount; // not enough consecutive numeric values for startCode change
   }
  }
 }
 
 if (isNaN(barcode[i])==true){ // initiate numeric compression calculation, if any, when an non-numeric character is encountered
  // if character is 
  if (barcode[i]=="~" && numcount%2==0){
   barcodeL+=1;// increment count for character
   if (i==0){
    barcodeL+=1; // incrment count for initial start UCC code.
    }
   }
  else{ 
   if (numcount==i-1){
    // barcode began with a string of numbers
    if (numcount%2==0){ 
     // even number - half the count add 1 for starCode change C to B
      barcodeL+=(numcount/2)+1;
    }else{
     // odd number - half the count and one for remaining number and for startCode change C to B
     barcodeL+=Math.floor(numcount/2)+2;
    }
   }
   else if(numcount>=4){
    if (numcount%2==0){ 
     // even number - half the count add one for startCode change B to C and startCode change C to B
      barcodeL+=(numcount/2)+2;
    }
    else{
     // odd number - half the count and one for remaining number and for startCode change B to C and startCode change C to B
     barcodeL+=Math.floor(numcount/2)+3;
    }
   }
   else if(numcount!=0){
    barcodeL+=numcount; // not enough consecutive numeric values for startCode change
   }
   barcodeL+=1;// increment count for character
   numcount=0; // reset numeric count to 0
  }
 }
} 
var actualLength=Number(11*barcodeL); // number of bars per unit
actualLength = Number(actualLength +24); // number of bars for Start/Stop/CheckDigit
actualLength = Number(actualLength * xDim); // actual width of barcode in 1/1000"
actualLength = Number(actualLength / 1000); // width of barcode in inches
var newStartPoint = Number((labelWidth - actualLength) / 2) ; // compute new left edge position of barcode
newStartPoint = Math.round(newStartPoint*Math.pow(10,2))/Math.pow(10,2); // round value to nearest 1/1000
label.fields.field.(@name =='CODE128').@posLeft= newStartPoint; // move barcode
// replace "~" with FNC1()
barcodeData = barcodeData.replace(/~/g,func1);
label.fields.field.(@name =='CODE128').@data=barcodeData; 

Note

This may not function correctly if Autodiscriminate is enabled (Zebra printers only)

Article Number

2016059

Versions

Loftware Label Manager version 9.5.3 or higher

Environment

All Supported Loftware Print Server and Label Manager Environments