ReactJS: Input fire onChange when user stopped typing (or pressed Enter key)

Component.jsx

import React, { Component } from 'react';

import TextField from 'components/base/TextField';

const WAIT_INTERVAL = 1000;
const ENTER_KEY = 13;

export default class TextSearch extends Component {
    constructor(props) {
        super();

        this.state = {
            value: props.value
        };
    }

    componentWillMount() {
        this.timer = null;
    }

    handleChange(value) {
        clearTimeout(this.timer);

        this.setState({ value });

        this.timer = setTimeout(::this.triggerChange, WAIT_INTERVAL);
    }

    handleKeyDown(e) {
        if (e.keyCode === ENTER_KEY) {
            ::this.triggerChange();
        }
    }

    triggerChange() {
        const { value } = this.state;

        this.props.onChange(value);
    }

    render() {
        const { className } = this.props;

        return (
            <TextField
                className={className}
                placeholder={l('Search')}
                value={this.state.value}
                onChange={::this.handleChange}
                onKeyDown={::this.handleKeyDown}
            />
        );
    }
}

Thank you
But I have modified some code. It works with my project.

import React, { Component } from 'react'

const WAIT_INTERVAL = 1000
const ENTER_KEY = 13

class TextSearch extends Component {
  state = {
    value: ''
  }

  timer = null

  handleChange = e => {
    clearTimeout(this.timer)

    this.setState({ value: e.target.value })

    this.timer = setTimeout(this.triggerChange, WAIT_INTERVAL)
  }

  handleKeyDown = e => {
    if (e.keyCode === ENTER_KEY) {
      clearTimeout(this.timer)
      this.triggerChange()
    }
  }

  triggerChange = () => {
    const { value } = this.state

    this.props.onChange(value)
  }

  render() {
    const { ...rest } = this.props

    return (
      <input
        type={rest.type}
        className={rest.className}
        placeholder={rest.placeholder}
        value={this.state.value}
        onChange={this.handleChange}
        onKeyDown={this.handleKeyDown}
      />
    )
  }
}

export default TextSearch

Hey, can you explain what is type= rest.type attribute in input element.

Never mind, got it, its the rest/spread thing you are using to pass the props passed to the component.
Thanks again.

Thank you

But I have modified some code. It works with my project.

import React, { Component } from 'react'

const WAIT_INTERVAL = 1000
const ENTER_KEY = 13

class TextSearch extends Component {
  state = {
    value: ''
  }

  timer = null

  handleChange = e => {
    clearTimeout(this.timer)

    this.setState({ value: e.target.value })

    this.timer = setTimeout(this.triggerChange, WAIT_INTERVAL)
  }

  handleKeyDown = e => {
    if (e.keyCode === ENTER_KEY) {
      clearTimeout(this.timer)
      this.triggerChange()
    }
  }

  triggerChange = () => {
    const { value } = this.state

    this.props.onChange(value)
  }

  render() {
    const { ...rest } = this.props

    return (
      <input
        type={rest.type}
        className={rest.className}
        placeholder={rest.placeholder}
        value={this.state.value}
        onChange={this.handleChange}
        onKeyDown={this.handleKeyDown}
      />
    )
  }
}

export default TextSearch

Thanks

👍

Initialise
this.timer in constructor instead of lifecycle
constructor( ) {
super()
this.timer = null
}

I am trying to make an API call. But, as soon as I am writing some in the textbox. I am getting "Uncaught TypeError: this.props.onChange is not a function at TextSearch.triggerChange ". Thanks.

Would be great if someone will put the same example but with react hook (for react component) example.

Hi

For react hook I found this great article :

https://joaoforja.com/blog/5-steps-to-perform-a-search-when-user-stops-typing-using-react-+-hooks-in-a-controlled-component/

Frédérik

👍

Great share ! Thank you 👍
I did the update told by @barsbek and also added a "searchChanged" boolean so there's no useless API call if the user frantically taps Enter.

    handleChange(e) {
        clearTimeout(this.timerId);
        this.setState({ search: e.target.defaultValue });
        this.searchChanged = true;
        this.timerId = setTimeout(this.updateList, SearchFolder.WAIT_INTERVAL);
    }

    handleKeyDown(e) {
        if (e.keyCode === SearchFolder.ENTER_KEY && this.searchChanged) {
            clearTimeout(this.timerId);
            this.updateList();
        }
    }

    updateList() {
        this.searchChanged = false;
        this.repository.peek(this.state.search, 0, 15, 0).then((response: FolderListItem[]) => {
            this.setState({ listItems: response });
        }).catch((error) => {
            this.setState({ item: "Erreur : " + error.message });
        });
    }