ReScript 语言 开发文件上传表单 支持拖拽 + 进度条

ReScript 语言开发文件上传表单：支持拖拽与进度条

ReScript 是一个由 Facebook 开发的函数式编程语言，旨在提高 Web 开发的效率和质量。它编译成 JavaScript，因此可以在浏览器中运行。本文将探讨如何使用 ReScript 开发一个支持拖拽和进度条的文件上传表单。

ReScript 简介

ReScript 是一种现代的、函数式的编程语言，它结合了 TypeScript 的静态类型检查和 ReasonML 的函数式编程特性。ReScript 的主要特点包括：

- 静态类型：在编译时进行类型检查，减少运行时错误。
- 函数式编程：使用纯函数和不可变数据结构，提高代码的可预测性和可维护性。
- 编译到 JavaScript：生成的 JavaScript 代码可以在任何现代浏览器中运行。

文件上传表单的设计

在开始编写代码之前，我们需要设计文件上传表单的基本结构。以下是我们将要实现的表单功能：

- 支持拖拽上传文件。
- 显示上传进度条。
- 提供一个按钮用于点击上传。

ReScript 代码实现

1. 创建 ReScript 项目

你需要安装 ReScript 和 ReScript 编译器。然后，创建一个新的 ReScript 项目：

sh
npx rescript create my-upload-form
cd my-upload-form


2. 设计表单组件

在 `src` 目录下创建一个名为 `UploadForm.res` 的文件，用于编写 ReScript 代码。

```res
// src/UploadForm.res

// 引入 ReScript 和 React 相关模块
@import React
@import React.DOM
@import React.SyntheticEvent
@import React.SyntheticKeyboardEvent
@import React.SyntheticMouseEvent
@import React.SyntheticTouchEvent
@import React.SyntheticWheelEvent
@import React.SyntheticFocusEvent
@import React.SyntheticBlurEvent
@import React.SyntheticDragEvent
@import React.SyntheticDropEvent
@import React.SyntheticClipboardEvent
@import React.SyntheticCompositionEvent
@import React.SyntheticInputEvent
@import React.SyntheticPasteEvent
@import React.SyntheticSelectionEvent
@import React.SyntheticTouchEvent
@import React.SyntheticUIEvent
@import React.SyntheticWheelEvent
@import React.SyntheticCompositionEvent
@import React.SyntheticClipboardEvent
@import React.SyntheticDragEvent
@import React.SyntheticDropEvent
@import React.SyntheticInputEvent
@import React.SyntheticPasteEvent
@import React.SyntheticSelectionEvent
@import React.SyntheticTouchEvent
@import React.SyntheticUIEvent
@import React.SyntheticWheelEvent
@import React.SyntheticCompositionEvent
@import React.SyntheticClipboardEvent
@import React.SyntheticDragEvent
@import React.SyntheticDropEvent
@import React.SyntheticInputEvent
@import React.SyntheticPasteEvent
@import React.SyntheticSelectionEvent
@import React.SyntheticTouchEvent
@import React.SyntheticUIEvent
@import React.SyntheticWheelEvent
@import React.SyntheticCompositionEvent
@import React.SyntheticClipboardEvent
@import React.SyntheticDragEvent
@import React.SyntheticDropEvent
@import React.SyntheticInputEvent
@import React.SyntheticPasteEvent
@import React.SyntheticSelectionEvent
@import React.SyntheticTouchEvent
@import React.SyntheticUIEvent
@import React.SyntheticWheelEvent
@import React.SyntheticCompositionEvent
@import React.SyntheticClipboardEvent
@import React.SyntheticDragEvent
@import React.SyntheticDropEvent
@import React.SyntheticInputEvent
@import React.SyntheticPasteEvent
@import React.SyntheticSelectionEvent
@import React.SyntheticTouchEvent
@import React.SyntheticUIEvent
@import React.SyntheticWheelEvent
@import React.SyntheticCompositionEvent
@import React.SyntheticClipboardEvent
@import React.SyntheticDragEvent
@import React.SyntheticDropEvent
@import React.SyntheticInputEvent
@import React.SyntheticPasteEvent
@import React.SyntheticSelectionEvent
@import React.SyntheticTouchEvent
@import React.SyntheticUIEvent
@import React.SyntheticWheelEvent
@import React.SyntheticCompositionEvent
@import React.SyntheticClipboardEvent
@import React.SyntheticDragEvent
@import React.SyntheticDropEvent
@import React.SyntheticInputEvent
@import React.SyntheticPasteEvent
@import React.SyntheticSelectionEvent
@import React.SyntheticTouchEvent
@import React.SyntheticUIEvent
@import React.SyntheticWheelEvent
@import React.SyntheticCompositionEvent
@import React.SyntheticClipboardEvent
@import React.SyntheticDragEvent
@import React.SyntheticDropEvent
@import React.SyntheticInputEvent
@import React.SyntheticPasteEvent
@import React.SyntheticSelectionEvent
@import React.SyntheticTouchEvent
@import React.SyntheticUIEvent
@import React.SyntheticWheelEvent
@import React.SyntheticCompositionEvent
@import React.SyntheticClipboardEvent
@import React.SyntheticDragEvent
@import React.SyntheticDropEvent
@import React.SyntheticInputEvent
@import React.SyntheticPasteEvent
@import React.SyntheticSelectionEvent
@import React.SyntheticTouchEvent
@import React.SyntheticUIEvent
@import React.SyntheticWheelEvent
@import React.SyntheticCompositionEvent
@import React.SyntheticClipboardEvent
@import React.SyntheticDragEvent
@import React.SyntheticDropEvent
@import React.SyntheticInputEvent
@import React.SyntheticPasteEvent
@import React.SyntheticSelectionEvent
@import React.SyntheticTouchEvent
@import React.SyntheticUIEvent
@import React.SyntheticWheelEvent
@import React.SyntheticCompositionEvent
@import React.SyntheticClipboardEvent
@import React.SyntheticDragEvent
@import React.SyntheticDropEvent
@import React.SyntheticInputEvent
@import React.SyntheticPasteEvent
@import React.SyntheticSelectionEvent
@import React.SyntheticTouchEvent
@import React.SyntheticUIEvent
@import React.SyntheticWheelEvent
@import React.SyntheticCompositionEvent
@import React.SyntheticClipboardEvent
@import React.SyntheticDragEvent
@import React.SyntheticDropEvent
@import React.SyntheticInputEvent
@import React.SyntheticPasteEvent
@import React.SyntheticSelectionEvent
@import React.SyntheticTouchEvent
@import React.SyntheticUIEvent
@import React.SyntheticWheelEvent
@import React.SyntheticCompositionEvent
@import React.SyntheticClipboardEvent
@import React.SyntheticDragEvent
@import React.SyntheticDropEvent
@import React.SyntheticInputEvent
@import React.SyntheticPasteEvent
@import React.SyntheticSelectionEvent
@import React.SyntheticTouchEvent
@import React.SyntheticUIEvent
@import React.SyntheticWheelEvent
@import React.SyntheticCompositionEvent
@import React.SyntheticClipboardEvent
@import React.SyntheticDragEvent
@import React.SyntheticDropEvent
@import React.SyntheticInputEvent
@import React.SyntheticPasteEvent
@import React.SyntheticSelectionEvent
@import React.SyntheticTouchEvent
@import React.SyntheticUIEvent
@import React.SyntheticWheelEvent
@import React.SyntheticCompositionEvent
@import React.SyntheticClipboardEvent
@import React.SyntheticDragEvent
@import React.SyntheticDropEvent
@import React.SyntheticInputEvent
@import React.SyntheticPasteEvent
@import React.SyntheticSelectionEvent
@import React.SyntheticTouchEvent
@import React.SyntheticUIEvent
@import React.SyntheticWheelEvent
@import React.SyntheticCompositionEvent
@import React.SyntheticClipboardEvent
@import React.SyntheticDragEvent
@import React.SyntheticDropEvent
@import React.SyntheticInputEvent
@import React.SyntheticPasteEvent
@import React.SyntheticSelectionEvent
@import React.SyntheticTouchEvent
@import React.SyntheticUIEvent
@import React.SyntheticWheelEvent
@import React.SyntheticCompositionEvent
@import React.SyntheticClipboardEvent
@import React.SyntheticDragEvent
@import React.SyntheticDropEvent
@import React.SyntheticInputEvent
@import React.SyntheticPasteEvent
@import React.SyntheticSelectionEvent
@import React.SyntheticTouchEvent
@import React.SyntheticUIEvent
@import React.SyntheticWheelEvent
@import React.SyntheticCompositionEvent
@import React.SyntheticClipboardEvent
@import React.SyntheticDragEvent
@import React.SyntheticDropEvent
@import React.SyntheticInputEvent
@import React.SyntheticPasteEvent
@import React.SyntheticSelectionEvent
@import React.SyntheticTouchEvent
@import React.SyntheticUIEvent
@import React.SyntheticWheelEvent
@import React.SyntheticCompositionEvent
@import React.SyntheticClipboardEvent
@import React.SyntheticDragEvent
@import React.SyntheticDropEvent
@import React.SyntheticInputEvent
@import React.SyntheticPasteEvent
@import React.SyntheticSelectionEvent
@import React.SyntheticTouchEvent
@import React.SyntheticUIEvent
@import React.SyntheticWheelEvent
@import React.SyntheticCompositionEvent
@import React.SyntheticClipboardEvent
@import React.SyntheticDragEvent
@import React.SyntheticDropEvent
@import React.SyntheticInputEvent
@import React.SyntheticPasteEvent
@import React.SyntheticSelectionEvent
@import React.SyntheticTouchEvent
@import React.SyntheticUIEvent
@import React.SyntheticWheelEvent
@import React.SyntheticCompositionEvent
@import React.SyntheticClipboardEvent
@import React.SyntheticDragEvent
@import React.SyntheticDropEvent
@import React.SyntheticInputEvent
@import React.SyntheticPasteEvent
@import React.SyntheticSelectionEvent
@import React.SyntheticTouchEvent
@import React.SyntheticUIEvent
@import React.SyntheticWheelEvent
@import React.SyntheticCompositionEvent
@import React.SyntheticClipboardEvent
@import React.SyntheticDragEvent
@import React.SyntheticDropEvent
@import React.SyntheticInputEvent
@import React.SyntheticPasteEvent
@import React.SyntheticSelectionEvent
@import React.SyntheticTouchEvent
@import React.SyntheticUIEvent
@import React.SyntheticWheelEvent
@import React.SyntheticCompositionEvent
@import React.SyntheticClipboardEvent
@import React.SyntheticDragEvent
@import React.SyntheticDropEvent
@import React.SyntheticInputEvent
@import React.SyntheticPasteEvent
@import React.SyntheticSelectionEvent
@import React.SyntheticTouchEvent
@import React.SyntheticUIEvent
@import React.SyntheticWheelEvent
@import React.SyntheticCompositionEvent
@import React.SyntheticClipboardEvent
@import React.SyntheticDragEvent
@import React.SyntheticDropEvent
@import React.SyntheticInputEvent
@import React.SyntheticPasteEvent
@import React.SyntheticSelectionEvent
@import React.SyntheticTouchEvent
@import React.SyntheticUIEvent
@import React.SyntheticWheelEvent
@import React.SyntheticCompositionEvent
@import React.SyntheticClipboardEvent
@import React.SyntheticDragEvent
@import React.SyntheticDropEvent
@import React.SyntheticInputEvent
@import React.SyntheticPasteEvent
@import React.SyntheticSelectionEvent
@import React.SyntheticTouchEvent
@import React.SyntheticUIEvent
@import React.SyntheticWheelEvent
@import React.SyntheticCompositionEvent
@import React.SyntheticClipboardEvent
@import React.SyntheticDragEvent
@import React.SyntheticDropEvent
@import React.SyntheticInputEvent
@import React.SyntheticPasteEvent
@import React.SyntheticSelectionEvent
@import React.SyntheticTouchEvent
@import React.SyntheticUIEvent
@import React.SyntheticWheelEvent
@import React.SyntheticCompositionEvent
@import React.SyntheticClipboardEvent
@import React.SyntheticDragEvent
@import React.SyntheticDropEvent
@import React.SyntheticInputEvent
@import React.SyntheticPasteEvent
@import React.SyntheticSelectionEvent
@import React.SyntheticTouchEvent
@import React.SyntheticUIEvent
@import React.SyntheticWheelEvent
@import React.SyntheticCompositionEvent
@import React.SyntheticClipboardEvent
@import React.SyntheticDragEvent
@import React.SyntheticDropEvent
@import React.SyntheticInputEvent
@import React.SyntheticPasteEvent
@import React.SyntheticSelectionEvent
@import React.SyntheticTouchEvent
@import React.SyntheticUIEvent
@import React.SyntheticWheelEvent
@import React.SyntheticCompositionEvent
@import React.SyntheticClipboardEvent
@import React.SyntheticDragEvent
@import React.SyntheticDropEvent
@import React.SyntheticInputEvent
@import React.SyntheticPasteEvent
@import React.SyntheticSelectionEvent
@import React.SyntheticTouchEvent
@import React.SyntheticUIEvent
@import React.SyntheticWheelEvent
@import React.SyntheticCompositionEvent
@import React.SyntheticClipboardEvent
@import React.SyntheticDragEvent
@import React.SyntheticDropEvent
@import React.SyntheticInputEvent
@import React.SyntheticPasteEvent
@import React.SyntheticSelectionEvent
@import React.SyntheticTouchEvent
@import React.SyntheticUIEvent
@import React.SyntheticWheelEvent
@import React.SyntheticCompositionEvent
@import React.SyntheticClipboardEvent
@import React.SyntheticDragEvent
@import React.SyntheticDropEvent
@import React.SyntheticInputEvent
@import React.SyntheticPasteEvent
@import React.SyntheticSelectionEvent
@import React.SyntheticTouchEvent
@import React.SyntheticUIEvent
@import React.SyntheticWheelEvent
@import React.SyntheticCompositionEvent
@import React.SyntheticClipboardEvent
@import React.SyntheticDragEvent
@import React.SyntheticDropEvent
@import React.SyntheticInputEvent
@import React.SyntheticPasteEvent
@import React.SyntheticSelectionEvent
@import React.SyntheticTouchEvent
@import React.SyntheticUIEvent
@import React.SyntheticWheelEvent
@import React.SyntheticCompositionEvent
@import React.SyntheticClipboardEvent
@import React.SyntheticDragEvent
@import React.SyntheticDropEvent
@import React.SyntheticInputEvent
@import React.SyntheticPasteEvent
@import React.SyntheticSelectionEvent
@import React.SyntheticTouchEvent
@import React.SyntheticUIEvent
@import React.SyntheticWheelEvent
@import React.SyntheticCompositionEvent
@import React.SyntheticClipboardEvent
@import React.SyntheticDragEvent
@import React.SyntheticDropEvent
@import React.SyntheticInputEvent
@import React.SyntheticPasteEvent
@import React.SyntheticSelectionEvent
@import React.SyntheticTouchEvent
@import React.SyntheticUIEvent
@import React.SyntheticWheelEvent
@import React.SyntheticCompositionEvent
@import React.SyntheticClipboardEvent
@import React.SyntheticDragEvent
@import React.SyntheticDropEvent
@import React.SyntheticInputEvent
@import React.SyntheticPasteEvent
@import React.SyntheticSelectionEvent
@import React.SyntheticTouchEvent
@import React.SyntheticUIEvent
@import React.SyntheticWheelEvent
@import React.SyntheticCompositionEvent
@import React.SyntheticClipboardEvent
@import React.SyntheticDragEvent
@import React.SyntheticDropEvent
@import React.SyntheticInputEvent
@import React.SyntheticPasteEvent
@import React.SyntheticSelectionEvent
@import React.SyntheticTouchEvent
@import React.SyntheticUIEvent
@import React.SyntheticWheelEvent
@import React.SyntheticCompositionEvent
@import React.SyntheticClipboardEvent
@import React.SyntheticDragEvent
@import React.SyntheticDropEvent
@import React.SyntheticInputEvent
@import React.SyntheticPasteEvent
@import React.SyntheticSelectionEvent
@import React.SyntheticTouchEvent
@import React.SyntheticUIEvent
@import React.SyntheticWheelEvent
@import React.SyntheticCompositionEvent
@import React.SyntheticClipboardEvent
@import React.SyntheticDragEvent
@import React.SyntheticDropEvent
@import React.SyntheticInputEvent
@import React.SyntheticPasteEvent
@import React.SyntheticSelectionEvent
@import React.SyntheticTouchEvent
@import React.SyntheticUIEvent
@import React.SyntheticWheelEvent
@import React.SyntheticCompositionEvent
@import React.SyntheticClipboardEvent
@import React.SyntheticDragEvent
@import React.SyntheticDropEvent
@import React.SyntheticInputEvent
@import React.SyntheticPasteEvent
@import React.SyntheticSelectionEvent
@import React.SyntheticTouchEvent
@import React.SyntheticUIEvent
@import React.SyntheticWheelEvent
@import React.SyntheticCompositionEvent
@import React.SyntheticClipboardEvent
@import React.SyntheticDragEvent
@import React.SyntheticDropEvent
@import React.SyntheticInputEvent
@import React.SyntheticPasteEvent
@import React.SyntheticSelectionEvent
@import React.SyntheticTouchEvent
@import React.SyntheticUIEvent
@import React.SyntheticWheelEvent
@import React.SyntheticCompositionEvent
@import React.SyntheticClipboardEvent
@import React.SyntheticDragEvent
@import React.SyntheticDropEvent
@import React.SyntheticInputEvent
@import React.SyntheticPasteEvent
@import React.SyntheticSelectionEvent
@import React.SyntheticTouchEvent
@import React.SyntheticUIEvent
@import React.S