Uncaught (in promise): cordova_not_available in Io

问题:

When i run ionic app with ionic serve -l, get this error:

Runtime Error

Uncaught (in promise): cordova_not_available

Stack

Error: Uncaught (in promise): cordova_not_available
at v (http://localhost:8100/build/polyfills.js:3:4864)
at s (http://localhost:8100/build/polyfills.js:3:4289)
at s (http://localhost:8100/build/polyfills.js:3:4112)
at http://localhost:8100/build/polyfills.js:3:4652
at t.invokeTask (http://localhost:8100/build/polyfills.js:3:10284)
at Object.onInvokeTask (http://localhost:8100/build/main.js:38692:37)
at t.invokeTask (http://localhost:8100/build/polyfills.js:3:10220)
at e.runTask (http://localhost:8100/build/polyfills.js:3:7637)
at i (http://localhost:8100/build/polyfills.js:3:3707)
at HTMLDocument.invoke (http://localhost:8100/build/polyfills.js:3:11437)

other details

Ionic Framework: 2.2.0
Ionic Native: 2.8.1
Ionic App Scripts: 1.1.4
Angular Core: 2.4.8
Angular Compiler CLI: 2.4.8
Node: 6.9.2
OS Platform: Windows 10
Navigator Platform: Win32
User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36

I Install HotSpot plugin, with following command :

ionic plugin add cordova-plugin-hotspot --save

cordova plugin add cordova-plugin-hotspot --save

Usage app.component.ts

import { Component } from '@angular/core';
import { Platform } from 'ionic-angular';
import { StatusBar, Splashscreen,Hotspot,Network } from 'ionic-native';
import { TabsPage } from '../pages/tabs/tabs';


@Component({
 templateUrl: 'app.html'
})

export class MyApp {
rootPage = TabsPage;

 constructor(platform: Platform) {

  platform.ready().then(() => {
     StatusBar.styleDefault();
     Splashscreen.hide();
     Hotspot.scanWifi().then((networks: Array<Network>) => {
     console.log(networks);

 });
})
   }
  }

Also, I see other questions but don't solve my problem.

回答1:

You are accessing native plugins while testing in the browser. In order to make plugins work, you should use a real device to test.

In order to make your code testable in browser (or actually don't break when testing in browser) you should have an if-statement checking if Cordova is available :

  if (this.platform.is('cordova')) {
    // You're on a device, call the native plugins. Example: 
    //
    // var url: string = '';
    // 
    // Camera.getPicture().then((fileUri) => url = fileUri);
  } else {
    // You're testing in browser, do nothing or mock the plugins' behaviour.
    //
    // var url: string = 'assets/mock-images/image.jpg';
  }

EDIT:

As Ricky Levi correctly mentions here below, Ionic supports the browser platform. Using this platform, most common plugins are able to work. Note that some plugins would not, for example the Barcode-scanner plugin. As it will prompt you with an alert, asking for the value that has to be scanned. Which will lose the whole use-case of a Barcode Scanner.

回答2:

Maybe something has changed since then, but Ionic now supports the "browser" as a platform ( vs simply browse ) - which makes the Cordova plugins available in the browser.

To use it you add the platform ionic cordova platform add browser

And then you run ionic cordova run browser vs ionic serve ( ionic run browser - just like ionic cordova run android or ionic cordova run ios )

回答3:

Cordova is only accessible when you run your app on a real device. When you test your app in the browser, it cannot access those native plugins.

You can check if you are on a real device or a browser like that:

if (this.platform.is('cordova')) {
  // You are on a device, cordova plugins are accessible
} else {
  // Cordova not accessible, add mock data if necessary
}

This will only help you test the parts of your app that don't rely on cordova plugins. To really test your app, you need to run it on a device or in the emulator.

回答4:

For running the app in browser

1.Check the platform

# import {Platform} from 'ionic-angular';
 # constructor(public platform:Platform) {
     if (this.platform.is('core')) {
      this.myPlatform = "Browser";
      console.log('I am on a web browser')
    } else {
      this.mobileDevice = "True"
    }
   }

Use these checking in your methods where you are implementing the Cordova dependencies.

回答5:

Download the Ionic View app and then run the command ionic upload.

You will then be able to preview the app on your phone and the native features will work.

回答6:

this error is generated when you trying to access mobile functionalities on a non mobile device for example if you want access to mobile GPS you need cordova it's the link chain between javascript code and the targeted platform

the best thing to do is to test the environment you running on if its cordova so you don't fall in the cordova not fund error

    if (this.platform.is('cordova')) {
    // You're on a mobile device "IOS ANDROID WINDOWS" 
    // now you can call your native plugins
  } else {
    // You're testing in a browser so you may want to use another method or run your code on a emulator
  }