Call function within callback with TypeScript

Question

Given the below: https://github.com/Uepaa-AG/p2pkit-cordova

I am not figuring out how I'd call onEnabled for example. Not using `ts' the example obviously works great.

But now that I am working with TypeScript, I can't seem to call the nested functions properly.

I have this: cordova.plugins.p2pkit.enable("xyzzy", this.p2pkitCallback, function...

p2pkitCallback() {
        onEnabled() {
          console.log('p2pkit enbled');
          cordova.plugins.p2pkit.enableProximityRanging()
          cordova.plugins.p2pkit.startDiscovery('', cordova.plugins.p2pkit.HIGH_PERFORMANCE) // base64 encoded Data (bytes)=
    }

onEnabled() is highlighted in red of course... How should I refactor the code?

Thanks!

there's an example on how to do it in the link you provided, ts is the same as js.. the first one actually... the code you pasted is not even valid js/ts. — toskv
– toskv, Commented May 22, 2017 at 13:37

Nico Van Belle · Accepted Answer · 2017-05-22 13:42:10Z

1

You can pass and call callback functions in Typescript as following;

Declare a callback function argument and call it asynchronous.

public generate(report: Report, callback: () => any = () => {}): void {
    this.generateReport(report, ReportType.PDF).then(callback);
}

Example of passing the callback to the function:

doFilter(payload): void {
    const callback = () => this.filter.hide();
    this.reportService.generate(payload.reportKey, callback);
  }

Note that in my example I optionally assign the callback variable to a noop function to prevent stuff from breaking when no callback is provided.

answered May 22, 2017 at 13:42

Nico Van Belle

5,2044 gold badges36 silver badges55 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

toskv Over a year ago

I'm pretty sure that if he's going to fix the syntax for the onEnabled property he's going to be fine. :)

Collectives™ on Stack Overflow

Call function within callback with TypeScript

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related