Cordova plugin - network interface issue

Ionic Framework ionic-v3
1

Downloaded the plugin from https://github.com/salbahra/cordova-plugin-networkinterface

Can’t use any global variable or call any other function inside the function

networkinterface.getIPAddress(function (ip) { alert(ip);});

If i use something like this

networkinterface.getIPAddress(function (ip) {
  alert(ip);
  this.test(ip);
});

test(x) {
  console.log("IP = "+ x);
}

I get an error

Error in Success callbackId: networkinterface1280836273 : TypeError: Cannot read property 'test' of null.

I get Ip alert properly but I can’t access it outside the function.
Also typerscript gives the error [ts] Cannot find name 'networkinterface'. any when i use the plugin. But it still compiles and works
Any idea how to solve the issue?

2

Read about this.

3

You should use arrow functions (AKA lambda functions in TS) to capture the meaning of this from the surrounding context (as @rapropos wanted to hint you above I guess). You’ll find a good explanation about this in the TypeScript documentation. In the context of your code sample it means to change it this way:

export class Test {
  // ...
  function loadIPAddress() {
    networkinterface.getIPAddress((ip) => {
      alert(ip);
      this.test(ip);
    });
  }

  function test(x) {
    console.log("IP = "+ x);
  }
  // ...
}
2 Likes
4

Thank you so much @rapropos and @iignatov. It worked like a charm.
Although i must say that this is quite confusing :stuck_out_tongue_winking_eye:

5

ok any update on [ts] Cannot find name 'networkinterface'. any

I tried this solution this solution but the comand
typings install cordova/plugins/networkinterface --ambient --save
can not find the desired file

6

I guess that there are no typing definitions for this plugin then, you could try using an ambient declaration to get rid of the error message (untested, but it should work):

declare var networkinterface: any;
1 Like
7

Yes, it works. Thanks again

8

TypeError Cannot read property ‘getIPAddress’ of undefined

9

Please see this answer on Stackoverflow.

10

still getting the error. You can check over there.