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50 React Coding Puzzles
  • 50 React Coding Puzzles
  • Contact
  • Reviews
  • Table of Contents
  • Introduction
  • 1 - Simple Counter App
  • 2 - Dynamic List of Items with Strikethrough
  • 3 - Color Picker with Hex Code Display
  • 4 - Password Strength Checker
  • 5 - Countdown Timer with Audio
  • 6 - Dynamic Movie List with Filtering and Sorting
  • 7 - Text Animation Component (Fade/Scroll)
  • 8 - Dynamically Generated Text Art
  • 9 - Meme Generator with Custom Text
  • 10 - "What Should I Eat?" Random Recipe Generator
  • 11 - Simple Quiz App with Multiple Choice
  • 12 - Unit Converter
  • 13 - Dynamic Image Gallery with Lightbox
  • 14 - Weather Widget with Temperature and Description
  • 15 - Contact Form with Email and Message Validation
  • 16 - Color Palette Generator
  • 17 - Drag-and-Drop Feature for Rearranging Items
  • 18 - Interactive Quiz with Dynamic Results and Feedback
  • 19 - To-Do List with Task Categorization
  • 20 - Note-Taking App with Markdown Support
  • 21 - Simple Calculator with Basic Operations
  • 22 - Word Scramble Game with Timer and Score
  • 23 - Number Guessing Game
  • 24 - Digital Clock with Time Zone Support
  • 25 - Interactive Time Zone Converter
  • 26 - Weather Forecast App with Location Detection
  • 27 - Real-Time Stock Ticker with Updates
  • 28 - Virtual Dice Roller with Multiple Dice
  • 29 - Responsive Navigation Menu with Dropdowns
  • 30 - Progress Bar for Loading or Task Completion
  • 31 - Modal Window for Alerts and Confirmations
  • 32 - Infinite Scroll for Loading More Content
  • 33 - Form Validation with Error Messages
  • 34 - Search Bar with Filtering and Suggestions
  • 35 - Drag-and-Drop File Upload
  • 36 - Interactive Color Picker with Sliders
  • 37 - Image Carousel with Autoplay
  • 38 - Rating System with Stars or Thumbs Up/Down
  • 39 - Comment Section with Nested Replies
  • 40 - Pagination for Long Lists of Data
  • 41 - Stopwatch app that tracks elapsed time
  • 42 - Responsive E-commerce Product Grid
  • 43 - Random Movie/Book Recommender
  • 44 - Kanban board for managing tasks with drag-and-drop
  • 45 - Chat application with real-time messaging using WebSockets
  • 46 - Calendar that displays events and allows scheduling
  • 47 - Tic-Tac-Toe Game
  • 48 - Hangman Game
  • 49 - Notes App
  • 50 - Expense Tracker
  • Afterword
  • Appendix
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On this page
  • Description
  • Algorithm
  • Classes
  • Code
  • Explanation
  • Possible Future Enhancements

35 - Drag-and-Drop File Upload

Description

Create a drag-and-drop file upload component that allows users to drag and drop files onto a designated area, displays visual cues to indicate drag-and-drop support and file selection, handles file selection and initiates the upload process, and provides feedback during the upload process.

Algorithm

  1. Create a React component for the drag-and-drop file upload

  2. Define the designated drop area and the file input field

  3. Use the useState hook to manage the file selection and upload status

  4. Use the useEffect hook to initialize the drag-and-drop functionality

  5. Display visual cues to indicate drag-and-drop support and file selection

  6. Handle file selection and initiate the upload process

  7. Provide feedback during the upload process

Classes

  • DragAndDropFileUpload: The main drag-and-drop file upload component

  • DropArea: The designated drop area component

  • FileInput: The file input field component

  • UploadFeedback: The upload feedback component

Code

DragAndDropFileUpload.js

import React, { useState, useEffect } from 'react';
import DropArea from './DropArea';
import FileInput from './FileInput';
import UploadFeedback from './UploadFeedback';

const DragAndDropFileUpload = () => {
  const [selectedFile, setSelectedFile] = useState(null);
  const [uploadStatus, setUploadStatus] = useState('idle');

  useEffect(() => {
    const initDragAndDrop = () => {
      const dropArea = document.getElementById('drop-area');
      const fileInput = document.getElementById('file-input');

      dropArea.addEventListener('dragover', (event) => {
        event.preventDefault();
        dropArea.classList.add('dragover');
      });

      dropArea.addEventListener('dragleave', () => {
        dropArea.classList.remove('dragover');
      });

      dropArea.addEventListener('drop', (event) => {
        event.preventDefault();
        const file = event.dataTransfer.files[0];
        setSelectedFile(file);
        setUploadStatus('uploading');
        uploadFile(file);
      });

      fileInput.addEventListener('change', (event) => {
        const file = event.target.files[0];
        setSelectedFile(file);
        setUploadStatus('uploading');
        uploadFile(file);
      });
    };
    initDragAndDrop();
  }, []);

  const uploadFile = (file) => {
    // Upload file logic here
  };

  return (
    <div>
      <DropArea />
      <FileInput />
      {selectedFile && <UploadFeedback uploadStatus={uploadStatus} />}
    </div>
  );
};

export default DragAndDropFileUpload;

DropArea.js

import React from 'react';

const DropArea = () => {
  return (
    <div id="drop-area" className="drop-area">
      <p>Drag and drop files here</p>
    </div>
  );
};

export default DropArea;

FileInput.js

import React from 'react';

const FileInput = () => {
  return (
    <input id="file-input" type="file" />
  );
};

export default FileInput;

UploadFeedback.js

import React from 'react';

const UploadFeedback = ({ uploadStatus }) => {
  if (uploadStatus === 'uploading') {
    return <p>Uploading...</p>;
  } else if (uploadStatus === 'success') {
    return <p>Upload successful!</p>;
  } else {
    return <p>Upload failed.</p>;
  }
};

export default UploadFeedback;

Explanation

The code creates a drag-and-drop file upload component that allows users to drag and drop files onto a designated area, displays visual cues to indicate drag-and-drop support and file selection, handles file selection and initiates the upload process, and provides feedback during the upload process. The component uses the useState hook to manage the file selection and upload status, and the useEffect hook to initialize the drag-and-drop functionality.

Possible Future Enhancements

  • Add support for multiple file uploads

  • Add support for file validation and error handling

  • Add support for upload progress tracking

  • Use a library like React Dropzone for more advanced drag-and-drop functionality

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Last updated 10 months ago