CODEWITHSUNDEEP
javascriptreactjsreact-nativestatereset
cmcodes
cmcodes

Reputation: 1866

Reset component state in React Native

I want to reset the state of only certain (not all) states. On the click of a button, values of present_count, total_count, present and total should be set to their initial state (0). While the state of subjects and text should remain intact.

constructor(props) {
    super(props);
    this.state = { 
      subjects: [],
      text: "",
      present_count: [0, 0, 0, 0, 0, 0, 0],
      total_count: [0, 0, 0, 0, 0, 0, 0],
      present: 0,
      total: 0
    }
}

EDIT: I am using AsyncStorage to save the modified state.

Upvotes: 0

Views: 6128

Answers (3)

ROOT
ROOT

Reputation: 11622

You can use spread operator to override the current state values and then use the current state value of text, subjects:

// default state 
const defaultState = {
  subjects: [],
  text: "",
  present_count: [0, 0, 0, 0, 0, 0, 0],
  total_count: [0, 0, 0, 0, 0, 0, 0],
  present: 0,
  total: 0
}

// component constructor.
constructor(props) {
    super(props);
    this.state = { ...defaultState };
}

// click event handler    
handleClick = () => {
  this.setState({
    ...defaultState,
    subjects: this.state.subjects,
    text: this.state.text
  });
}

Upvotes: 2

Lim Jing Rong
Lim Jing Rong

Reputation: 426

Using the spread operator would likely be useful here.

constructor(props) {
    super(props);
    this.defaultState = {
      present_count: [0, 0, 0, 0, 0, 0, 0],
      total_count: [0, 0, 0, 0, 0, 0, 0],
      present: 0,
      total: 0
    }
    this.state = { 
      subjects: [],
      text: "",
      ...defaultState,
    }
}
.
.
.
onClick = () => {
  this.setState({
    ...this.defaultState, // This will only pass in values from your defaultState and leave the others (subjects & text) alone
  });
}

Upvotes: 1

Brian H.
Brian H.

Reputation: 1669

You can create an object store your state your initial state of states you want to reset, like this:

const initState = {
   total: 0,
   present: 0,
   present_count: [0, 0, 0, 0, 0, 0, 0],
   total_count: [0, 0, 0, 0, 0, 0, 0],
}

and then you can

this.setState({
   ...initialState
})

on your button onClick

Hope that help. ^^

Upvotes: 1

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