html2thermal
v1.0.7
Allows to print custom html on thermal (POS) printer using nodejs on any target platform: linux, windows, osx...
18/weekUpdated 3 years agoMITUnpacked: 97.7 KB
Published by Oleksandr Knyga
npm install html2thermalHTML2Thermal  
JavaScript library to translate subset of HTML into commands which would be executed on the thermal printer.
Library is based on the popular node-thermal-printer module which provides adapters for EPSON and STAR thermal printers command line printing.
Motivation
Compare the code in HTML and direct commands for printer.
HTML: dsdasdas
``HTML`
oneone
Direct JS commands:
`JS`
printer.alignCenter()
printer.print('dsdasdas')
printer.newLine()
printer.bold(true)
printer.print('oneone')
printer.bold(true)
printer.newLine()
printer.alignLeft()
HTML code version:
* allows to create preview of what will be printed in the browser
* makes code more readable
* reduces integration time
Installation
`
bash
npm install html2thermal node-thermal-printer
`$3
Linux requires build-essentials
bash
sudo apt-get install build-essential
`Documentation
Library exports 2 functions:
1. converts xml to the thermal printer commands.
* xml as XML code to be converted to commands
* characterSet
2. executes the commands on the thermal printer.
* printer as an instance of the printer from the node-thermal-printer
* xml as XML code to be executed on the thermal printer
* isCut defines if cut operation should be executed at the end of the printing process$3
* perform sound of an internal beeper if present
* breaks the line (new line)
* ... sets text bold
* aligns text to center
* aligns text to left
* aligns text to right
* cuts the paper if printer supports it
* cuts the paper and leaves the bridge in the middle if printer supports it
* ...
isolates content on the separate line
* ...
isolates content on the separate line
* sets text to double height
* ... sets underline to the text
* sets double underline or thick to the text
* sets text to double width
* changes text font to the first supported (A or default)
* changes text font to the second supported (B)
* draws the line-separator
* prints the image from src (file:, http:, https:, data:, ...), width and height in pixels are optional
* inverts background and foreground colors
* resets all text settings to normal, redundant operation
* opens cash drawer if present
* prints code128 bar code with data provided in the data property
* prints QR code with data provided in the data property
* sets text to quad area
* prints content upside down
* table
* table row
* cell of the table row, width property is optional and in factor (0.5, 0.25, ...), align property is optional (left, right, center), bold property is optional (true), style property is optional
$3
* font-style: bold sets text bold (NOTE: no support for number value yet)
If no tag provided, then
print operation will be executed.$3
* PC437_USA
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* Example
JS
const printer = require('node-thermal-printer')
const {execute} = require('html2thermal')
printer.init({
type: 'epson',
// If you connect over TCP
interface: 'tcp://192.168.192.168',
})const template =
hello world
it is
me
me
execute(printer, template);
Licence
HTML2Thermal is MIT licenсed.