ngx-printer

A easy to use service to print the window, parts of a window (div) or an image. Printing of Angular Templates or Components is possible. You can print opening a new window / tab or using the current window. A directive can also be used to mark and store an HTML-element.

Several usefull directives can further assist you.

See the DEMO App for examples.

Usage

1. Add to main app.module imports
2. Use the NgxPrinterService where you like via DI (private printerService: NgxPrinterService)
3. Use the the functions provided by the service

Options

Open new window

The service prints by opening a new window. There is an option printWindowOpen to change this behavoir. Set printWindowOpen=false;

You can also set this option in .forRoot while importing the module to the app.module

    imports: [
    BrowserModule,
    NgxPrinterModule.forRoot({printOpenWindow: true})
  ],

Rendering time

Before openening the print window the service to some time to render the print content. Default time is 200ms. You can adjust the time using the property timeToWaitRender (also in forRoot).

Default CSS-Class

When printing to the current window the service creates an component with a css-class called 'default'. You can override this class name using the property renderClass (also in forRoot). Make sure that the class is placed in your global styles (styles.css).

Functions - How to print

Print current window

this.printerService.printCurrentWindow();

Print div by id

this.printerService.printDiv('idOfDivToPrint');

Print image src/url directly

this.printerService.printImg('assets/bratwurst.jpg');

Print Angular TemplateRef or Component

 @ViewChild('PrintTemplate')
  private PrintTemplateTpl: TemplateRef<any>;

printTemplate() {
    this.printerService.printAngular(this.PrintTemplateTpl);
  }

Beware: To print a component the component needs to be known by service (copy source and add it to entry component of app.module). Otherwise use printHTMLElement instead.

Print HTML Element

 @ViewChild(LittleDummyComponent, {read: ElementRef}) PrintComponent: ElementRef;

 printHTMLElementToCurrent() {
    this.printerService.printHTMLElement(this.PrintComponent.nativeElement);
  }

Event of print window

If you want to check whether the print window is open or not you can subscribe to observable $printWindowOpen

this.printWindowSubscription = this.printerService.$printWindowOpen.subscribe(val => {
      console.log('Print window is open:', val);
});

Directive ngxPrintItem

There is an directive ngxPrintItem to mark and store an HTML-Element as an item which can be printed later and anyhwere on the page. An id has to be set. These items are stored in the services observable printerService.$printItems. Use the async pipe to subscribe and the function printPrintItem to print the item.

HTML:

<span id="firstPrintItem" ngxPrintItem printName="First one" >A <b>first</b> span with an ngxPrintItem directive</span>

<div *ngFor="let prinItem of $printItems | async">
  <span>{{prinItem.id}} - {{prinItem.printName}}</span>
  <button (click)="printItem(prinItem)">Print me!</button>
</div>

TS:

  printItem(itemToPrint: PrintItem) {
    this.printerService.printPrintItem(itemToPrint);
  }
});

## Directive ngxPrintItemButton
If you want to print a single item from the list of ngxPrintItems (see above) without ts you can use the diretive ngxPrintItemButton. You have to know the id of the printItem.
The Click-Event to print the item will be automatically set.

HTML:
```html
<button ngxPrintItemButton printItemId="firstPrintItem">Print first item directly</button>

Directive ngxPrintItemMarker

If you want to indicate an item as printable you can use this directive. The default class adds a little printer symbol to the top left of the html element.

Customization

You can override the default class with the customClass property. Make sure that the css class is globally accessable e.g. put it into "styles.css". You can also only override the image using the property backgroundImage. You can speficy the data for the background-url.

Event

You can listen to the event 'printClicked'.

HTML:

<div id="printDivMarker" ngxPrintItemMarker (printClicked)="printerMarkerClicked()">

<div id="printDivMarker" ngxPrintItemMarker customClass="mymarker" >