bootstrap+spring boot实现面包屑导航功能(前端代码)

面包屑导航介绍

一般的内容型网站，例如CMS都会有这种面包屑导航。总结起来它有以下优势：

让用户了解目前所在的位置，以及当前页面在整个网站中所在的位置；

体现了网站的架构层级；提高了用户体验；

减少返回到上一级页面的操作；

实现效果

那我们应该如何实现？我看网上多数都是只提供静态实现，

这里我结合bootstrap 和 spring boot以及mysql来做一个完整的例子。

表结构设计

图里面的菜单其实是分级维护上下级关系的。我这里用到了2级，表里有level字段标记。

点击第1级加载第2级分类，点击第2级分类名称则展示面包屑导航。

CREATE TABLE `tb_category` (
 `id` bigint(20) NOT NULL AUTO_INCREMENT,
 `category_name` varchar(100) NOT NULL,
 `parent_id` bigint(20) DEFAULT NULL,
 `level` tinyint(1) DEFAULT NULL,
 PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=8 DEFAULT CHARSET=utf8;
insert into tb_category values(1,'Java文档',0,1);
insert into tb_category values(2,'Java多线程',1,2);
insert into tb_category values(3,'Spring Boot',1,2);
insert into tb_category values(4,'微服务实战',1,2);
insert into tb_category values(5,'Java视频',0,1);
insert into tb_category values(6,'Java基础',5,2);
insert into tb_category values(7,'Java基础',1,2);
commit;

前端代码

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org"
   xmlns:sec="http://www.thymeleaf.org/extras/spring-security">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>响应式布局</title>
  <link href="https://cdn.bootcss.com/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
<input type="text" id="ctx" hidden="hidden" th:value="${#request.getContextPath()}">
<div class="container-fluid">
  <!--页头-->
  <nav class="navbar navbar-inverse">
    <div class="container-fluid">
      <!-- Brand and toggle get grouped for better mobile display -->
      <div class="navbar-header">
        <button type="button" class="navbar-toggle collapsed" data-toggle="collapse"
            data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
          <span class="sr-only">Toggle navigation</span>
          <span class="icon-bar"></span>
          <span class="icon-bar"></span>
          <span class="icon-bar"></span>
        </button>
        <a class="navbar-brand" th:href="@{'/breadCrumb'}" rel="external nofollow" >Java分享</a>
      </div>
      <!-- Collect the nav links, forms, and other content for toggling -->
      <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
        <ul class="nav navbar-nav" id="navbar">
        </ul>
      </div>
    </div>
  </nav>
  <!--面包屑-->
  <ol class="breadcrumb">
  </ol>
  <div class="list-group" id="submenu-list">
  </div>
</div>
<script src="https://cdn.bootcss.com/jquery/3.4.0/jquery.min.js"></script>
<script src="https://cdn.bootcss.com/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script>
<script>
  var ctx=$("#ctx").val();
  $(function () {
    // 获取一级菜单
    getMenu(null,1);
  });
  function getMenu(id, level){
    var json = {parentId:id,level:level};
    $.ajax({
      url: ctx+"/myCategory/list",
      type: "POST",
      contentType: "application/json",
      dataType: "json",
      data: JSON.stringify(json),
      success: function (result) {
        var text='';
        if (result.success) {
          if(result.data != null){
            // 一级菜单
            if(level!=null){
              $.each(result.data, function (i, r) {
                text += '<li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" οnclick="getMenu('+r.id+')">'+r.categoryName+'</a></li>'
              });
              $("#navbar").empty();
              $("#navbar").append(text);
            }
            // 子菜单
            if(id!=null){
              $.each(result.data, function (i, r) {
                console.log(i);
                text += '<a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="list-group-item" οnclick="getBreadCrumb('+r.id+')">'+r.categoryName+'</a>'
              });
              $("#submenu-list").empty();
              $("#submenu-list").append(text);
            }
          }
        } else {
          alert(result.message);
        }
      }
    });
  }
  // 生成面包屑导航
  function getBreadCrumb(id) {
    var param = {id:id};
    $.ajax({
      url: ctx+"/myCategory/getParentList",
      type: "GET",
      data: {"id":id},
      success: function (result) {
        var text='';
        if(result.data!=null){
          text = '<li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >首页</a></li>';
          $.each(result.data, function (i, r) {
            text += '<li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >'+r.categoryName+'</a></li>'
          });
          $(".breadcrumb").empty();
          $(".breadcrumb").append(text);
        }
      }
    })
  }
</script>
</body>
</html>

总结

频道导航

bootstrap+spring boot实现面包屑导航功能(前端代码)

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