CODEWITHSUNDEEP
javascriptreactjs
Profer
Profer

Reputation: 643

TypeError: Cannot read property 'startDate' of undefined

I am having below error in my react component

TypeError: Cannot read property 'startDate' of undefined

I know this is because I didn't bind my function. It works when I have hour in my localStorage. But now when I have custom in my localStorage. And also it works in componentWillMount either it has hour or custom. So here is my code

class Home extends Component {
  constructor (props) {
    super(props)
    this.state = {
      filterType: this.getFilterType(localStorage.getItem('daysFilter') ? localStorage.getItem('daysFilter') : 'today'),
    }
  }
    getFilterType (type) {
    let filterType = 'hour'
    if (type === 'today') {
      filterType = 'hour'
    }
    if (type === "custom" ){
      const startDate = this.state.startDate
      const endDate   = this.state.endDate
    }
    return filterType
  }
}

But I need to know how can I bind my function inside constructor?

Upvotes: 0

Views: 1496

Answers (1)

Alon Yampolski
Alon Yampolski

Reputation: 849

When you're instantiating this.state you are calling getFilterType(type) which uses this.state which is not yet initialized.

Upvotes: 1

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