call hasCapability and getting error

[brianping7]

Hi, when i call the function "hasCapability“, i'm getting the following error.
if(this.handle.hasCapability('power')) {
^

TypeError: this.handle.hasCapability is not a function

i think it is because it doesn't initialized successfully, but i don't know why, their is no other log i can check, could you help? thanks.

[aholstenson]

How do you create and assign the value to this.handle?

[brianping7]

this.handle = miio.device({ address: ip, token: token }) .then(console.log(name + ' create')) .catch(console.error(name + ' failed'));

i'm using device function.

[aholstenson]

miio.device() returns a promise that asynchronously resolves the device, so this.handle will still be pointing to that promise in the code you posted.

You probably want something like this instead:

miio.device({ address: ip, token: token })
  .then(device => this.handle = device)
  .catch(handleErrorConnectingToDevice);