Code 39 – Barcode Biscuits

Teething BiscuitsCode 39 takes me way back to sinking my teeth into my first real barcode programming experience. Code 39 is a very simple and straightforward code set consisting of 43 unique representable characters and one start and stop character: the asterisk “*”. If you’ve never done any work with barcodes before, this is a no-brainer selection for an introductory symbology. As such, we can make this lesson a very simple one. I will explain how you can, using the code from the September 19th, 2013 post, generate real, scannable codes in minutes.

There are two setup arrays, and only one line of the four lines of JavaScript code is non-trivial. Here we go…

The Code 39 Setup

// Symbology-specific arrays
var arrayCode39Bin = new Array (
'1010001110111010', '1110100010101110', '1011100010101110', '1110111000101010', // 0, 1, 2, 3
'1010001110101110', '1110100011101010', '1011100011101010', '1010001011101110', // 4, 5, 6, 7
'1110100010111010', '1011100010111010', '1110101000101110', '1011101000101110', // 8, 9, A, B
'1110111010001010', '1010111000101110', '1110101110001010', '1011101110001010', // C, D, E, F
'1010100011101110', '1110101000111010', '1011101000111010', '1010111000111010', // G, H, I, J
'1110101010001110', '1011101010001110', '1110111010100010', '1010111010001110', // K, L, M, N
'1110101110100010', '1011101110100010', '1010101110001110', '1110101011100010', // O, P, Q, R
'1011101011100010', '1010111011100010', '1110001010101110', '1000111010101110', // S, T, U, V
'1110001110101010', '1000101110101110', '1110001011101010', '1000111011101010', // W, X, Y, Z
'1000101011101110', '1110001010111010', '1000111010111010', '1000100010001010', // -, ., (space), $
'1000100010100010', '1000101000100010', '1010001000100010', '1000101110111010'); // /, +, %, *

var strCode39 = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ-. $/+%*";

Take these lines of code and add them to the bottom of the Setup portion of the file given out in the Posted on Author Brian