类型错误:scrollIntoView 不是函数 [英] TypeError: scrollIntoView is not a function

问题描述

我是 react-testing-library/jest 的新手，并试图编写一个测试来查看路线导航(使用 react-router-dom)是否正确执行.到目前为止，我一直在关注 README 和这个 教程关于如何使用.

我的一个组件在本地函数中使用了 scrollIntoView，这会导致测试失败.

TypeError: this.messagesEnd.scrollIntoView 不是函数45 |46 |scrollToBottom = () =>{>47 |this.messagesEnd.scrollIntoView({行为:平滑"});|^48 |}49 |50 |

这是我的聊天机器人组件中的功能:

componentDidUpdate() {this.scrollToBottom();}scrollToBottom = () =>{this.messagesEnd.scrollIntoView({行为:平滑"});}

这是失败的测试示例:

test('默认屏幕', () => {const { getByTestId, getByText } = renderWithRouter(<App/>)期望(getByTestId('索引'))const leftClick = {按钮:0}fireEvent.click(getByText('View Chatbot'), leftClick) <-- 测试失败期望(getByTestId('聊天机器人'))})

我尝试使用模拟函数，但错误仍然存​​在.

这是分配 this.messageEnd 的地方:

 
<div className="chatbot-messages">//在这里渲染消息
<div className="chatbot-actions" ref={(el) =>{ this.messagesEnd = el;}}>//这里是消息操作的输入

我从这个堆栈溢出问题中引用了代码:如何滚动到底部有反应吗?

解决方案

test('默认屏幕', () => {window.HTMLElement.prototype.scrollIntoView = function() {};const { getByTestId, getByText } = renderWithRouter(<App/>)期望(getByTestId('索引'))const leftClick = {按钮:0}fireEvent.click(getByText('View Chatbot'), leftClick)期望(getByTestId('聊天机器人'))})

解决方案

scrollIntoView 未在 jsdom 中实现.这是问题所在:link.

您可以通过手动添加来使其工作:

window.HTMLElement.prototype.scrollIntoView = function() {};

I am new to react-testing-library / jest and attempting to write a test to see if the navigation of routes (using react-router-dom) is performed correctly. So far I have been following the README and this tutorial on how to use.

One of my components uses scrollIntoView in a local function and this causes the test to fail.

TypeError: this.messagesEnd.scrollIntoView is not a function

  45 |
  46 |     scrollToBottom = () => {
> 47 |         this.messagesEnd.scrollIntoView({ behavior: "smooth" });
     |                          ^
  48 |     }
  49 |
  50 | 

This is the function in my chatbot component:

componentDidUpdate() {
    this.scrollToBottom();
}

scrollToBottom = () => {
    this.messagesEnd.scrollIntoView({ behavior: "smooth" });
}

And this is a sample of the tests that fail:

test('<App> default screen', () => {

    const { getByTestId, getByText } = renderWithRouter(<App />)

    expect(getByTestId('index'))

    const leftClick = {button: 0}
    fireEvent.click(getByText('View Chatbot'), leftClick) <-- test fails

    expect(getByTestId('chatbot'))

})

I have tried to use a mock function, however the error still remains.

This is where this.messageEnd is assigned:

    <div className="chatbot">
        <div className="chatbot-messages">
            //render messages here
        </div>
        <div className="chatbot-actions" ref={(el) => { this.messagesEnd = el; }}>
            //inputs for message actions here
        </div>
    </div>

I referenced code from this stack overflow question: How to scroll to bottom in react?

SOLUTION

test('<App> default screen', () => {

    window.HTMLElement.prototype.scrollIntoView = function() {};

    const { getByTestId, getByText } = renderWithRouter(<App />)

    expect(getByTestId('index'))

    const leftClick = {button: 0}
    fireEvent.click(getByText('View Chatbot'), leftClick)

    expect(getByTestId('chatbot'))

})

解决方案

scrollIntoView is not implemented in jsdom. Here's the issue: link.

You might get it working by manually adding it:

window.HTMLElement.prototype.scrollIntoView = function() {};

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