Edit and Update Functionality - Reactjs

First, add the Link to the TableRow.js file.

// TableRow.js

import { Link } from 'react-router-dom';

<Link to={"/edit/"+this.props.obj._id} className="btn btn-primary">Edit</Link>

Add the following code to the edit.component.js file.

// edit.component.js

import React, { Component } from 'react';
import axios from 'axios';

export default class Edit extends Component {
  constructor(props) {
    super(props);
    this.onChangePersonName = this.onChangePersonName.bind(this);
    this.onChangeBusinessName = this.onChangeBusinessName.bind(this);
    this.onChangeGstNumber = this.onChangeGstNumber.bind(this);
    this.onSubmit = this.onSubmit.bind(this);

    this.state = {
      person_name: '',
      business_name: '',
      business_gst_number:''
    }
  }

  componentDidMount() {
      axios.get('http://localhost:4000/business/edit/'+this.props.match.params.id)
          .then(response => {
              this.setState({ 
                person_name: response.data.person_name, 
                business_name: response.data.business_name,
                business_gst_number: response.data.business_gst_number });
          })
          .catch(function (error) {
              console.log(error);
          })
    }

  onChangePersonName(e) {
    this.setState({
      person_name: e.target.value
    });
  }
  onChangeBusinessName(e) {
    this.setState({
      business_name: e.target.value
    })  
  }
  onChangeGstNumber(e) {
    this.setState({
      business_gst_number: e.target.value
    })
  }

  onSubmit(e) {
    e.preventDefault();
    const obj = {
      person_name: this.state.person_name,
      business_name: this.state.business_name,
      business_gst_number: this.state.business_gst_number
    };
    axios.post('http://localhost:4000/business/update/'+this.props.match.params.id, obj)
        .then(res => console.log(res.data));
    
    this.props.history.push('/index');
  }
 
  render() {
    return (
        <div style={{ marginTop: 10 }}>
            <h3 align="center">Update Business</h3>
            <form onSubmit={this.onSubmit}>
                <div className="form-group">
                    <label>Person Name:  </label>
                    <input 
                      type="text" 
                      className="form-control" 
                      value={this.state.person_name}
                      onChange={this.onChangePersonName}
                      />
                </div>
                <div className="form-group">
                    <label>Business Name: </label>
                    <input type="text" 
                      className="form-control"
                      value={this.state.business_name}
                      onChange={this.onChangeBusinessName}
                      />
                </div>
                <div className="form-group">
                    <label>GST Number: </label>
                    <input type="text" 
                      className="form-control"
                      value={this.state.business_gst_number}
                      onChange={this.onChangeGstNumber}
                      />
                </div>
                <div className="form-group">
                    <input type="submit" 
                      value="Update Business" 
                      className="btn btn-primary"/>
                </div>
            </form>
        </div>
    )
  }
}

So, what we have done is, we have used the component lifecycle method to fetch the data from the API.

That data needs to be displayed inside the textbox because this is edit form. Next, it is the same thing as we have written the code in the create.component.js file.

Save the file and go to the edit page from the index or listing page. If the data is not displayed then please first check that you have the running node.js server on the backend.

We have also written the code that will update the data because we have written the function that will send the request to the node.js server and update the data based on the ID.