README.md

Angular Thermal Printer Library

A library for connecting Angular apps with thermal printers.

Drivers

1. WEBUSB API (No drivers needed. Only works with Chrome and Opera with USB connection)

2. WebPRNT (http)

Print Language Drivers

1. ESC/POS

2. StarPRNT

3. Star WebPRNT

Installation

Install library

npm install ng-thermal-print

NOTE: if when compiling project you get an error like this: ERROR in node_modules/ng-thermal-print/lib/drivers/UsbDriver.d.ts:16:30 - error TS2304: Cannot find name 'USBDevice'. requestUsb(): Observable; then add reference to w3c-web-usb by installing it with command: npm install @types/w3c-web-usb --only=dev

Import into your application

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { ThermalPrintModule } from 'ng-thermal-print'; //add this line
import { AppComponent } from './app.component';

@NgModule({
   declarations: [
        AppComponent
    ],
    imports: [
        BrowserModule,
        ThermalPrintModule //add this line
    ],
    providers: [],
    bootstrap: [AppComponent]
})
export class AppModule { }

Example Usage

app.component.ts

import { PrintService, UsbDriver, WebPrintDriver } from 'ng-thermal-print';
import { Component } from '@angular/core';
import { PrintDriver } from 'ng-thermal-print/lib/drivers/PrintDriver';

@Component({
    selector: 'app-root',
    templateUrl: './app.component.html',
    styleUrls: ['./app.component.css']
})
export class AppComponent {
    status: boolean = false;
    usbPrintDriver: UsbDriver;
    webPrintDriver: WebPrintDriver;
    ip: string = '';

    constructor(private printService: PrintService) {
        this.usbPrintDriver = new UsbDriver();
        this.printService.isConnected.subscribe(result => {
            this.status = result;
            if (result) {
                console.log('Connected to printer!!!');
            } else {
            console.log('Not connected to printer.');
            }
        });
    }

    requestUsb() {
        this.usbPrintDriver.requestUsb().subscribe(result => {
            this.printService.setDriver(this.usbPrintDriver, 'ESC/POS');
        });
    }

    connectToWebPrint() {
        this.webPrintDriver = new WebPrintDriver(this.ip);
        this.printService.setDriver(this.webPrintDriver, 'WebPRNT');
    }

    print(driver: PrintDriver) {
        this.printService.init()
            .setBold(true)
            .writeLine('Hello World!')
            .setBold(false)
            .feed(4)
            .cut('full')
            .flush();
    }
}

app.component.html

<strong>Status: {{status}}</strong>
<div>
    <input [(ngModel)]="ip" type="text" name="ip" placeholder="IP of printer with WebPRNT">
    <button (click)="connectToWebPrint()">Connect to WebPRNT</button>
</div>

<div>
    <button (click)="requestUsb()">Connect to USB</button>
</div>

<div>
    <button (click)="print()" [disabled]="status === false"> Print!</button>
</div>