I’m new in hybrid apps development. I develop app that require printing. I installed it on android POS device that have thermal printer embedded on device I failed to detect the printer. Every time I open this page it alert the unavailable message . Help please here are my codes
import { Component } from '@angular/core';
import { NavController, NavParams,AlertController } from 'ionic-angular';
import { Printer, PrintOptions } from '@ionic-native/printer';
@Component({
selector: 'page-print',
templateUrl: 'print.html',
})
export class PrintPage {
constructor(
public navCtrl: NavController,
public navParams: NavParams,
public alertCtrl: AlertController,
public printer: Printer) {
this.printer.isAvailable().then(value => {
this.showAlert("isAvailable", value);
}).catch(error => {
this.showAlert("ERROR",error);
});
}
print(){
this.printer.check().then(data=>{
this.showAlert('Check',data);
},error =>{
this.showAlert('Check Failed',error);
});
}
showAlert(title, message) {
let alert = this.alertCtrl.create({
title: title,
subTitle: JSON.stringify(message),
buttons: ['OK']
});
alert.present();
}
}
You should really wait for Platform.ready before doing anything with native plugins.
print(){
this.platform.ready().then(success =>{
this.printer.check().then(data=>{
this.showAlert('Check',data);
},error =>{
this.showAlert('Check Failed',error);
});
},
error=>{
this.showAlert('Platform Not Ready',error);
})
}
I add platform.ready() but it still excute the error block of returned promise.
Is the printer available and usable in other apps?
Also, what is in error?
Yes there is app using the printer and it is printing
Error in json
{ "__zone_symbol__currentTask":{"type":"microTask","state":"notScheduled","source":"Promise.then","zone":"angular","cancelFn":null,"runCount":0}}
This doesn’t look right.
Please post your updated code again.
import { Component } from '@angular/core';
import { NavController, NavParams,AlertController,Platform } from 'ionic-angular';
import { Printer, PrintOptions } from '@ionic-native/printer';
@Component({
selector: 'page-print',
templateUrl: 'print.html',
})
export class PrintPage {
constructor(
public navCtrl: NavController,
public navParams: NavParams,
public alertCtrl: AlertController,
public printer: Printer,
public platform: Platform) {
}
print(){
this.platform.ready().then(success =>{
this.printer.check().then(data=>{
this.showAlert('Check',data);
},error =>{
this.showAlert('Check Failed',error);
});
},
error=>{
this.showAlert('Platform Not Ready',error);
});
}
showAlert(title, message) {
let alert = this.alertCtrl.create({
title: title,
subTitle: JSON.stringify(message),
buttons: ['OK']
});
alert.present();
}
}
Updated codes
Why did you change from isAvailable()?
Do you have other printers you could test with?
If you don’t get a better answer, try to use the Cordova plugin directly.
Now the service is available but how can i pick the embedded printer on my device so as I can print on the device.
this is picture of my device
How did you fix it?
Is the embedded printer available in other apps?
(You should probably create a new topic for “how can i pick the embedded printer on my device” so these two different questions don’t get mixed with each other)
Hi,
I have encountered the same error that printer available check failed. Did you finally fix your problem? Can you offer some help?
Did you find solution to print from this type of device?
