Question

所以，我有一个使用组构建的react.js应用。我们的导航栏可以使用，但是使用“汉堡包”菜单从较小的屏幕切换导航栏时，导航栏将打开，但是关闭该切换开关无效，它将保持打开状态。我没有对该页面进行编程，但是我一直在尝试调试为什么它无法关闭，并且据我所知，它应该可以工作。

是的，我知道react.bootstrap是一回事，我当时正在考虑对其进行转换，但是我已经到了最后期限，如果可能的话，我不想从头开始重写整个组件。任何想法或建议。我认为可能是在toggleNav函数中实现的，但是从我的测试来看，它似乎是正确的。

import React, { Component } from "react";
import { Link } from "react-router-dom";
import "./style.css";

class Nav extends Component {
  state = {
    open: false,
    width: window.innerWidth,
  };

  updateWidth = () => {
    const newState = { width: window.innerWidth };

    if (this.state.open && newState.width > 991) {
      newState.open = false;
    }

    this.setState(newState);
  };

  toggleNav = () => {
    this.setState({ open: !this.state.open });
  };

  setActiveNavItem = (path) => {
    return window.location.pathname === path ? "nav-link active" : "nav-link";
  };

  componentDidMount() {
    window.addEventListener("resize", this.updateWidth);
  }

  componentWillUnmount() {
    window.removeEventListener("resize", this.updateWidth);
  }

  render() {
    return (
      <nav className="navbar navbar-expand-lg navbar-light">
        <Link className="navbar-brand" to="/">
          Seenit
        </Link>
        <button
          onClick={this.toggleNav}
          className="navbar-toggler"
          data-toggle="collapse"
          data-target="#navbarNav"
          aria-controls="navbarNav"
          aria-expanded="false"
          aria-label="Toggle navigation"
        >
          <span className="navbar-toggler-icon" />
        </button>
        <div
          className={`${this.state.open ? "" : "collapse "}navbar-collapse`}
          id="navbarNav"
        >
          {/* Navbar items */}
          <ul className="navbar-nav">
            <li className="nav-item">
              <Link
                onClick={this.toggleNav}
                className={this.setActiveNavItem("/")}
                to="/"
              >
                Home
              </Link>
            </li>

            <li className="nav-item">
              <Link
                onClick={this.toggleNav}
                className={this.setActiveNavItem("/create-post")}
                to="/create-post"
              >
                Create a Post
              </Link>
            </li>

            <li className="nav-item">
              <Link
                onClick={this.toggleNav}
                className={this.setActiveNavItem("/log-in")}
                to="/log-in"
              >
                Log In
              </Link>
            </li>

            <li className="nav-item">
              <Link
                onClick={this.toggleNav}
                className={this.setActiveNavItem("/sign-up")}
                to="/sign-up"
              >
                Sign Up
              </Link>
            </li>
          </ul>
        </div>
      </nav>
    );
  }
}

export default Nav;

Answer 1

此React组件是Bootstrap Toggler Navbar的直接实现。

不幸的是，该组件还包含修改导航栏的代码，几乎可以肯定破坏了控制可折叠导航栏的Bootstrap代码。

这是此导航栏组件的纯HTML版本。请注意，它会在狭窄的屏幕上折叠成一个汉堡包（根据需要）。

从该组件中删除修改Bootstrap Toggler导航栏的代码应该很简单。

.navbar {
  outline: 1px solid #ddd;
}

<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css" integrity="sha384-9aIt2nRpC12Uk9gS9baDl411NQApFmC26EwAOH8WgZl5MYYxFfc+NcPb1dKGj7Sk" crossorigin="anonymous">


<body class="p-2">
  <nav class="navbar navbar-expand-lg navbar-light mr-5">
    <a class="navbar-brand" href="#">Seenit</a>
    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>

    <div class="collapse navbar-collapse" id="navbarNav">

      <ul class="navbar-nav">
        <li class="nav-item">
          <a class="nav-link" href="#">Home</a>
        </li>

        <li class="nav-item">
          <a class="nav-link" href="#">Create a Post</a>
        </li>

        <li class="nav-item">
          <a class="nav-link" href="#">Log In</a>
        </li>

        <li class="nav-item">
          <a class="nav-link" href="#">Sign Up</a>
        </li>
      </ul>

    </div>
  </nav>

  <!-- JS required for Bootstrap -->
  <script src="https://code.jquery.com/jquery-3.5.1.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
  <script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js" integrity="sha384-Q6E9RHvbIyZFJoft+2mJbHaEWldlvI9IOYy5n3zV9zzTtmI3UksdQRVvoxMfooAo" crossorigin="anonymous"></script>
  <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/js/bootstrap.min.js" integrity="sha384-OgVRvuATP1z7JjHLkuOU7Xw704+h835Lr+6QL9UvYjZE3Ipu6Tp75j7Bh/kR0JKI" crossorigin="anonymous"></script>
</body>

React.js Navbar汉堡菜单不会切换为已关闭

1 个答案: