CODEWITHSUNDEEP
reactjs
starcorn
starcorn

Reputation: 8551

reactjs - this.props not defined outside constructor

I have a component which I have passed a property from another component.

As following <RegisterVisitor someProperty={this.aFunction} />

In the child component however this.props is undefined outside of the constructor.

I took out the snippet of the code. this.props is defined in render () but it is not defined registerVisitor. Anyone know what the problem could be?

export default class RegisterVisitor extends React.Component {
    constructor(props) {
        super(props);
        this.registerVisitor = this.registerVisitor.bind(this);
    }

    registerVisitor () {            
        $.ajax({
            url: '/api/visit',
            type: 'POST',
            data: postData,
            contentType: 'application/json'
        })
        .done(
            function(result) {
                this.props.someProperty; //<------  undefined
            }
        );
    }
}

Upvotes: 1

Views: 407

Answers (1)

Oleksandr T.
Oleksandr T.

Reputation: 77482

In .done callback this does not refer to RegisterVisitor, you should set this for callback., you can do it with .bind 

...
.done(
  function(result) {
     this.props.someProperty;
  }.bind(this)
);

or also you can use arrow function 

...
.done((result) => {
  this.props.someProperty;
});

Upvotes: 3

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