如何在 puppeteer 中模拟拖放动作？

Question

我的应用程序中有 React-DnD（拖放）。我想对它进行 E2E 测试。

我想要模拟的是拖动特定元素并拖放到特定位置。我该怎么做？

我拥有的是：

//test.js
const mouse = page.mouse;
await mouse.down();
await mouse.move(126, 19);
await page.waitFor(400);

使用此代码，选择完成，但拖动不起作用。我应该如何实现这个？

Answer 1

以下方法将允许您在 Puppeteer 中模拟拖放操作：

const example = await page.$('#example');
const bounding_box = await example.boundingBox();

await page.mouse.move(bounding_box.x + bounding_box.width / 2, bounding_box.y + bounding_box.height / 2);
await page.mouse.down();
await page.mouse.move(126, 19);
await page.mouse.up();

Answer 2

没有一个 Puppeteer 特定的解决方案对我有用，所以我最终将本机 javascript 写入一个文件并将其导入 Puppeteer（在我的例子中是 Jest）。

拖放.js

async function dragAndDrop(source, target) {
  await page.evaluate((source, target) => {
    source = document.querySelector('#'+source);

    event = document.createEvent("CustomEvent");
    event.initCustomEvent("mousedown", true, true, null);
    event.clientX = source.getBoundingClientRect().top;
    event.clientY = source.getBoundingClientRect().left;
    source.dispatchEvent(event);

    event = document.createEvent("CustomEvent");
    event.initCustomEvent("dragstart", true, true, null);
    event.clientX = source.getBoundingClientRect().top;
    event.clientY = source.getBoundingClientRect().left;
    source.dispatchEvent(event);

    event = document.createEvent("CustomEvent");
    event.initCustomEvent("drag", true, true, null);
    event.clientX = source.getBoundingClientRect().top;
    event.clientY = source.getBoundingClientRect().left;
    source.dispatchEvent(event);


    target = document.querySelector('#'+target);

    event = document.createEvent("CustomEvent");
    event.initCustomEvent("dragover", true, true, null);
    event.clientX = target.getBoundingClientRect().top;
    event.clientY = target.getBoundingClientRect().left;
    target.dispatchEvent(event);

    event = document.createEvent("CustomEvent");
    event.initCustomEvent("drop", true, true, null);
    event.clientX = target.getBoundingClientRect().top;
    event.clientY = target.getBoundingClientRect().left;
    target.dispatchEvent(event);

    event = document.createEvent("CustomEvent");
    event.initCustomEvent("dragend", true, true, null);
    event.clientX = target.getBoundingClientRect().top;
    event.clientY = target.getBoundingClientRect().left;
    target.dispatchEvent(event);
  }, source, target);
}

test.js

const dragAndDrop = require('./drag-and-drop')

describe('when dragging and dropping todo', () => {

  it('should change order on DOM', async () => {
    const firstTodo = await page.evaluate(() => document.querySelectorAll('.input-container .input')[0].id);
    const secondTodo = await page.evaluate(() => document.querySelectorAll('.input-container .input')[1].id);

    dragAndDrop(firstTodo, secondTodo);

    const newFirstTodo = await page.evaluate(() => document.querySelectorAll('.input-container .input')[0].id);
    const newSecondTodo = await page.evaluate(() => document.querySelectorAll('.input-container .input')[1].id);

    expect(newFirstTodo).toEqual(secondTodo)
    expect(newSecondTodo).toEqual(firstTodo)
  });
});

比内置的 Puppeteer 功能稍微多一些工作，但希望对于需要更多控制拖放的其他人来说，这是一个足够简单的复制和粘贴解决方案。

Answer 3

这是我在 puppeteer 中用于拖放的 sn-p：

//This assumes only one element will be found for selectors you provide, otherwise there's ambiguity on which element was selected.
//In my code I'm throwing on more than 1 element found

async dragAndDrop(page, originSelector, destinationSelector) {
  await page.waitForSelector(originSelector)
  await page.waitForSelector(destinationSelector)
  const origin = await page.$(originSelector)
  const destination = await page.$(destinationSelector)
  const ob = await origin.boundingBox()
  const db = await destination.boundingBox()
    
  console.log(`Dragging from ${ob.x + ob.width / 2}, ${ob.y + ob.height / 2}`)
  await page.mouse.move(ob.x + ob.width / 2, ob.y + ob.height / 2)
  await page.mouse.down()
  console.log(`Dropping at   ${db.x + db.width / 2}, ${db.y + db.height / 2}`)
  await page.mouse.move(db.x + db.width / 2, db.y + db.height / 2)
  await page.mouse.up()
}

请注意，在 puppeteer 中对拖放的支持仍然是 not fully 实现的。

Answer 4

如果这些示例对您不起作用，则可能是另一个时间问题。我玩了一段时间，直到这对我有用。 请注意鼠标命令之间的 50 毫秒等待和增加的步数，这会产生更多的移动/拖动事件并且似乎有所作为。

        // drag node
        let elm = await (await page.waitForSelector("#mynode", { visible: true }));
        let bounding_box = await elm.boundingBox();
        let x = bounding_box.x + bounding_box.width / 2;
        let y = bounding_box.y + bounding_box.height / 2;
        await page.mouse.move(x, y);
        await page.mouse.down();
        await page.waitForTimeout(50);
        await page.mouse.move(x + 100, y, { steps: 10 });
        await page.waitForTimeout(50);
        await page.mouse.up();
        await page.waitForTimeout(50);

        await page.screenshot({ path: 'after-drag.png' });