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Raj Rj
Raj Rj

Reputation: 3577

which is the right place to call the actions, componentWillMount() or componentDidMount()?

componentWillMount() called before dom is rendered. shall I call my action from here or from componentDidMount()?

What is the difference and which one should i prefer?

Upvotes: 1

Views: 492

Answers (2)

Dan Cron
Dan Cron

Reputation: 1155

The plan is to deprecate componentWillMount() in React 17, so I wouldn't use that in new code.

Upvotes: 0

kunal pareek
kunal pareek

Reputation: 1283

componentWillMount is called before mounting, therefore if your action changes state 'synchronously' this action will not lead to a re-rendering. This would be one of the big differences. The docs suggest you use the constructor instead of this method to initialise your comp.

actions from inside componentDidMount() will lead to re-render which might get expensive if the action changes state for an upstream component (if they are stateful) network calls should be handled at this stage typically.

Upvotes: 2

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