Question

研究没有结果，所以希望我能在这里找到答案。所有这些都是在安装了react-beautiful-dnd的最新node.js和create-react-app上完成的。请参阅代码下方的图片，了解应该发生什么和应该发生什么的示例。

＆＃13;

import React, { Component } from 'react';
import ReactDOM from 'react-dom';
import { DragDropContext, Droppable, Draggable } from 'react-beautiful-dnd';

// fake data generator
const getItems = (count) => Array.from({length: count}, (v, k) => k).map(k => ({
  id: `item-${k}`,
  content: `item ${k}`
}));

// a little function to help us with reordering the result
const reorder =  (list, startIndex, endIndex) => {
  const result = Array.from(list);
  const [removed] = result.splice(startIndex, 1);
  result.splice(endIndex, 0, removed);

  return result;
};

// using some little inline style helpers to make the app look okay
const grid = 8;
const getItemStyle = (draggableStyle, isDragging) => ({
  // some basic styles to make the items look a bit nicer
  userSelect: 'none',
  padding: grid * 2,
  marginBottom: grid,

  // change background colour if dragging
  background: isDragging ? 'lightgreen' : 'grey',

  // styles we need to apply on draggables
  ...draggableStyle
});
const getListStyle = (isDraggingOver) => ({
  background: isDraggingOver ? 'lightblue' : 'lightgrey',
  padding: grid,
  width: 250
});

class App extends Component {
  constructor(props) {
    super(props);
    this.state = {
      items: getItems(10)
    }
    this.onDragEnd = this.onDragEnd.bind(this);
  }

  onDragEnd (result) {
    // dropped outside the list
    if(!result.destination) {
      return;
    }

    const items = reorder(
      this.state.items,
      result.source.index,
      result.destination.index
    );

    this.setState({
      items
    });
  }

  // Normally you would want to split things out into separate components.
  // But in this example everything is just done in one place for simplicity
  render() {
    return (
      <DragDropContext onDragEnd={this.onDragEnd}>
        <Droppable droppableId="droppable">
          {(provided, snapshot) => (
            <div
              ref={provided.innerRef}
              style={getListStyle(snapshot.isDraggingOver)}
            >
              {this.state.items.map(item => (
                <Draggable
                  key={item.id}
                  draggableId={item.id}
                >
                  {(provided, snapshot) => (
                    <div>
                      <div
                        ref={provided.innerRef}
                        style={getItemStyle(
                          provided.draggableStyle,
                          snapshot.isDragging
                        )}
                        {...provided.dragHandleProps}
                      >
                        {item.content}
                      </div>
                      {provided.placeholder}
                    </div>
                  )}
                </Draggable>
              ))}
            </div>
          )}
        </Droppable>
      </DragDropContext>
    );
  }
}

// Put the thing into the DOM!
ReactDOM.render(<App />, document.getElementById('app'));

＆＃13;

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
    <meta name="theme-color" content="#000000">
    <!--
      manifest.json provides metadata used when your web app is added to the
      homescreen on Android. See https://developers.google.com/web/fundamentals/engage-and-retain/web-app-manifest/
    -->
    <link rel="manifest" href="%PUBLIC_URL%/manifest.json">
    <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico">
    <!--
      Notice the use of %PUBLIC_URL% in the tags above.
      It will be replaced with the URL of the `public` folder during the build.
      Only files inside the `public` folder can be referenced from the HTML.

      Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
      work correctly both with client-side routing and a non-root public URL.
      Learn how to configure a non-root public URL by running `npm run build`.
    -->
    <title>CodeForge</title>
  </head>
  <body>
    <noscript>
      You need to enable JavaScript to run this app.
    </noscript>
    <div id="app"></div>
    <!--
      This HTML file is a template.
      If you open it directly in the browser, you will see an empty page.

      You can add webfonts, meta tags, or analytics to this file.
      The build step will place the bundled scripts into the <body> tag.

      To begin the development, run `npm start` or `yarn start`.
      To create a production bundle, use `npm run build` or `yarn build`.
    -->
  </body>
</html>

＆＃13;

应该发生什么：

发生了什么（注意：光标悬停在列表项6上，但屏幕截图没有显示光标）：

Answer 1

我认为provided.draggableStyle可能是provided.draggableProps.style。当我开始尝试使用这个库时，我自己就遇到了这个问题。

为什么这个基本的反应 - 美丽的例子没有动画

1 个答案: