react js handling file upload

Question

I\'m new to react js. I want to upload image asynchronously with react js Suppose I have this code

var FormBox = React.createClass({
  getInitialState: funct         


        

Answer 1

import axios from 'axios';
var FormBox = React.createClass({
  getInitialState: function () {
    return {
      photo: [],
      name : '',
      documents:[]
    }
  },
  pressButton: function () {
    var component = this
    var data = new FormData();
    data.append("photo", component.state.photo, component.state.name);
    var request = axios.post('http://localhost:3000/document', data)
        request.then(function(response){
    // you need to send data from server in response
          if(response.status == 200){
             console.log('saved in db')
             component.state.documents.push(response.data.documents)
             // pushed document data in documents array
           }
        })


  },
  getPhoto: function () {
    var uploadfile = document.getElementById(upload_doc).files[0]
    this.setState({
      photo: uploadfile, name : uploadfile.name
    })
  },
  render: function () {
    var documents = this.state.documents.map((doc)=>{
       return <div>
                <a href={doc.url}>{doc.name}</a>
                <img src={doc.photo} />
              </div>
    })
   // you can show your documents uploaded this way using map function
    return (
      <form action='.' enctype="multipart/form-data">
        <input type='file' id='upload_doc'  onChange={this.getPhoto}/>
        <button onClick={this.pressButton}> Get it </button>
        <span>{documents}</span>
        // this way you can see uploaded documents
      </form>
    )
  }
})

ReactDOM.render(<FormBox />, document.getElementById('root'))