React - uncaught TypeError: Cannot read property 'setState' of undefined

Question

I am getting the following error

Uncaught TypeError: Cannot read property \'setState\' of undefined

even after binding delta in

Answer 1

This error can be resolved by various methods-

• If you are using ES5 syntax, then as per React js Documentation you have to use bind method.

  Something like this for the above example:

  this.delta = this.delta.bind(this)

• If you are using ES6 syntax,then you need not use bind method,you can do it with something like this:

  delta=()=>{ this.setState({ count : this.state.count++ }); }