Question

有人可以告诉我为什么此演示中没有显示下拉菜单吗？当我将鼠标悬停在“集体”一词上时，下拉菜单应该显示吗？

https://codesandbox.io/s/funny-river-c76hu

要使该应用正常运行，您必须在输入框中输入“ collective”，然后单击“ analyse”，然后将显示一个进度条，单击进度条中的蓝线，在“ collective”一词下将显示一个下划线那么您应该将鼠标悬停在“集合”一词上，并显示一个下拉菜单，但是当我将鼠标悬停在“集合”一词而不是下拉菜单上时，整个窗口就会消失

import React, { useState, useEffect } from "react";
import ReactDOM from "react-dom";
import { Content, Dropdown, Label, Progress, Button, Box } from "rbx";

import "rbx/index.css";

function App() {
  const [serverResponse, setServerResponse] = useState(null);
  const [text, setText] = useState([]);
  const [loading, setLoading] = useState(false);
  const [modifiedText, setModifiedText] = useState(null);
  const [selectedSentiment, setSentiment] = useState(null);
  const [dropdownContent, setDropdownContent] = useState([]);
  const [isCorrected, setIsCorrected] = useState(false);
  const [displayDrop, setDisplayDrop] = useState(false);
  useEffect(() => {
    if (serverResponse && selectedSentiment) {
      const newText = Object.entries(serverResponse[selectedSentiment]).map(
        ([word, recommendations]) => {
          const parts = text[0].split(word);
          const newText = [];
          parts.forEach((part, index) => {
            newText.push(part);
            if (index !== parts.length - 1) {
              newText.push(
                <u
                  className="dropbtn"
                  data-replaces={word}
                  onMouseOver={() => {
                    setDropdownContent(recommendations);
                    setDisplayDrop(true);
                  }}
                >
                  {word}
                </u>
              );
            }
          });

          return newText;
        }
      );

      setModifiedText(newText.flat());
    }
  }, [serverResponse, text, selectedSentiment]);

  const handleAnalysis = () => {
    setLoading(true);

    setTimeout(() => {
      setLoading(false);
      setServerResponse({ joy: { collective: ["inner", "constant"] } });
    }, 1500);
  };

  const handleTextChange = event => {
    setText([event.target.innerText]);
  };

  const replaceText = wordToReplaceWith => {
    const replacedWord = Object.entries(serverResponse[selectedSentiment]).find(
      ([word, recommendations]) => recommendations.includes(wordToReplaceWith)
    )[0];

    setText([
      text[0].replace(new RegExp(replacedWord, "g"), wordToReplaceWith)
    ]);
    setModifiedText(null);
    setServerResponse(null);
    setIsCorrected(true);
    setDropdownContent([]);
  };

  const hasResponse = serverResponse !== null;

  return (
    <Box>
      <Content>
        <div
          onInput={handleTextChange}
          contentEditable={!hasResponse}
          style={{ border: "1px solid red" }}
        >
          {hasResponse && modifiedText
            ? modifiedText.map((text, index) => <span key={index}>{text}</span>)
            : isCorrected
            ? text[0]
            : ""}
        </div>
        <br />
        {displayDrop ? (
          <div
            id="myDropdown"
            class="dropdown-content"
            onClick={() => setDisplayDrop(false)}
          >
            dropdownContent.map((content, index) => (
            <>
              <strong onClick={() => replaceText(content)} key={index}>
                {content}
              </strong>{" "}
            </>
            ))
          </div>
        ) : null}
        <br />
        <Button
          color="primary"
          onClick={handleAnalysis}
          disabled={loading || text.length === 0}
        >
          analyze
        </Button>
        <hr />
        {hasResponse && (
          <Label>
            Joy{" "}
            <Progress
              value={Math.random() * 100}
              color="info"
              onClick={() => setSentiment("joy")}
            />
          </Label>
        )}
      </Content>
    </Box>
  );
}

const rootElement = document.getElementById("root");
ReactDOM.render(<App />, rootElement);

css文件

.App {
  font-family: sans-serif;
  text-align: center;
}
.highlight {
  background: red;
  text-decoration: underline;
}

.dropbtn {
  color: white;

  font-size: 16px;
  border: none;
  cursor: pointer;
}

.dropbtn:hover,
.dropbtn:focus {
  background-color: #2980b9;
}

.dropdown {
  position: relative;
  display: inline-block;
}

.dropdown-content {
  position: relative;
  background-color: #f1f1f1;
  min-width: 160px;
  overflow: auto;
  box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
  z-index: 1;
}

.show {
  display: block;
}

Answer 1

问题是这样的：

{displayDrop ? (
      <div
        id="myDropdown"
        class="dropdown-content"
        onClick={() => setDisplayDrop(false)}
      >
        dropdownContent.map((content, index) => (
        <>
          <strong onClick={() => replaceText(content)} key={index}>
            {content}
          </strong>{" "}
        </>
        ))
      </div>
    ) : null}

您在dropdownContent周围缺少一对大括号。应该是：

    {displayDrop ? (
      <div
        id="myDropdown"
        class="dropdown-content"
        onClick={() => setDisplayDrop(false)}
      >
        {dropdownContent.map((content, index) => (
        <>
          <strong onClick={() => replaceText(content)} key={index}>
            {content}
          </strong>{" "}
        </>
        ))}
      </div>
    ) : null}

这里https://codesandbox.io/embed/fast-feather-lvpk7的工作沙箱现在正在显示此内容。

将鼠标悬停在单词上时，Reactjs下拉菜单不显示

1 个答案: