NgTerminal

NgTerminal is a web terminal that leverages xterm.js on Angular 7+. You can easily add it into your application by adding <ng-terminal></ng-terminal> into your component.

NgTerminal provides some features including xtermjs. It provides to adjust dimensions by dragging and to fix the number of rows and cols. New usuful features to devlopers should be added continuously.

Install

npm install ng-terminal --save

Example

You can run an example in your local environment.

1. git clone https://github.com/qwefgh90/ng-terminal.git
2. npm install
3. npm run lib-build
4. npm run start

Getting started

NgTerminalModule should be imported within your app module.

import { NgTerminalModule } from 'ng-terminal';
//...
@NgModule({
    imports: [
        NgTerminalModule
    //...

Just add <ng-terminal> to your app.component.html. And when the application starts, you can see the web terminal to do nothing.

  <ng-terminal #term></ng-terminal>

Now you can print or do something on the terminal with NgTerminal object which has APIs for developers. You can get a object by using @ViewChild in your component. It is very important that an object of NgTerminalComponent is populated after ngAfterViewInit() is called.

//...
export class YourComponent implements AfterViewInit{
  @ViewChild('term', { static: true }) child: NgTerminal;
  
  ngAfterViewInit(){
    this.invalidate();
    this.child.keyEventInput.subscribe(e => {
      console.log('keyboard event:' + e.domEvent.keyCode + ', ' + e.key);

      const ev = e.domEvent;
      const printable = !ev.altKey && !ev.ctrlKey && !ev.metaKey;

      if (ev.keyCode === 13) {
        this.child.write('\r\n$ ');
      } else if (ev.keyCode === 8) {
        // Do not delete the prompt
        if (this.child.underlying.buffer.cursorX > 2) {
          this.child.write('\b \b');
        }
      } else if (printable) {
        this.child.write(e.key);
      }
    })
  }

  //...

API

There are two ways to control the web terminal. One is to call APIs of NgTerminal directly in your ts code. Another is to use properties or the event binding.

NgTerminal

NgTerminal is a interface to provide public APIs you can call directly. You can get a object by using @ViewChild with a type of NgTerminal.

  import { NgTerminal } from 'ng-terminal';
  ...
  @ViewChild('term') child: NgTerminal; // for Angular 7
  @ViewChild('term', { static: true }) child: NgTerminal; // for Angular 8

NgTerminalComponent

NgTerminalComponent is a implementation of NgTerminal and the component to draw the terminal.

<ng-terminal #term [dataSource]="writeSubject" (keyEvent)="onKeyEvent($event)" [displayOption]="displayOptionBounded"></ng-terminal>

Underlying object

You can control a instance of the xtermjs directly by getting a property of underlying. Check out API of the Terminal from the API document

Control sequences

Control sequences is a programing interface to control terminal emulators. There are few implemented functions to return sequences including moving the cursor.

    import { FunctionsUsingCSI } from 'ng-terminal';
    ...
    const sequences = "data..1" + FunctionsUsingCSI.cursorBackward(1) + '2';
    component.write(sequences);

You can also find a full set of sequences here. For example, you can break lines by passing \x1b[1E to write(). Try in the sample page

Contribution

NgTerminal is developed with Angular CLI. You can always write issue and contribute through PR to master branch.