Old Drag drop

HTML

<script src="http://d3js.org/d3.v3.min.js"></script>

JavaScript

import React, { Component, createRef } from "react";
import Avatar from "@material-ui/core/Avatar";
import "../home.css";
import CloseIcon from "@material-ui/icons/Close";
import ErrorIcon from "@material-ui/icons/Error";
import FileCopyIcon from "@material-ui/icons/FileCopy";
import PropTypes from "prop-types";
import FormControl from "@material-ui/core/FormControl";

const imageMimeTypes = [
  "image/webp",
  "image/gif",
  "image/jpeg",
  "image/png",
  "image/svg+xml",
  "image/webp"
];
const pdfMimeTypes = ["application/pdf"];
const isFileImage = (file) => {
  return file && imageMimeTypes.includes(file["type"]);
};
const isFilePdf = (file) => {
  return file && pdfMimeTypes.includes(file["type"]);
};

const isWithinFileLimit = (file, fileLimit) => {
  return file.size <= fileLimit;
};

/**
 * Takes in a file limit prop and a submit prop
 * the submit prop is a function that recieves form data containing
 * the selected images
 */
class RenderDragDrop extends Component {
  constructor(props) {
    super(props);
    this.state = {
      dropArea: createRef(),
      gallery: [],
      erroredFiles: [],
      selectedFiles: [],
      isHighlighted: false
    };
  }

  uploadFiles = () => {
    const { selectedFiles } = this.state;
    let formData = new FormData();
    selectedFiles.forEach((file) => formData.append("file", file));
    this.props.onHandle(this.props.input.name, selectedFiles);
    this.setState({
      gallery: [],
      erroredFiles: [],
      selectedFiles: [],
      isHighlighted: false
    });
  };

  componentDidUpdate(prevProps, prevState) {
    const prevSelectedFiles = prevState.selectedFiles;
    const nextSelectedFiles = this.state.selectedFiles;
    if (prevSelectedFiles.length !== nextSelectedFiles.length) {
      this.previewFiles();
    }
  }

  handleFiles = (files) => {
    const localFiles = [];
    const erroredFiles = [];
    Array.from(files).forEach((file) => {
      const imageInstance = isFileImage(file);
      const...