Delay sending a request, before receiving a response from the previous one?

Question

Node.js

Good afternoon, how to implement a delay in sending requests? React and NodeJS
At the moment, I made it so that the button has a state, for example, ready: true, if a request was sent, then the state changes to false, as soon as a response is received, the state changes back to true.
I would like to learn how to correctly and correctly implement this from more experienced developers.

Answer 1

you need to make a flag at the beginning of the request, for example isFetch and set it to true. If the request ended or some error occurred during the request, then set it to false. And if isFetch is true then don't execute the request.

_getPostcards () {
    try {
this.setState({isFecth:true})
      const url = domain + '?app_id='+ app_id +'&category='+ category +'&page=' + this.state.page
      return fetch(url)
      .then((response) => response.json())
      .then((responseJson) => {
        console.log(responseJson)
        this.setState({ data: responseJson.photos, pageMax: responseJson.pages })
this.setState({isFecth:false}) //<--------
      })
      .catch((error) =>{
        console.error(error);
       this.setState({isFecth:false}) //<--------
      });
    } catch (e) {
      throw e
      this.setState({isFecth:false}) //<--------
    }
  }