javascript - 遍历 Javascript 对象以构建嵌套列表

Question

我正在尝试使用递归循环从这样结构的对象构建一个 HTML 列表——可能的深度级别有无限多:

object = {
   "directories":{
      "vegetables":{
         "info":{
            "name":"Vegetables"
         },
         "files":{

         },
         "directories":{
            "green vegetables":{
               "info":{
                  "name":"Green Vegetables"
               },
               "files":{

               },
               "directories":{
                  "lettuce":{
                     "info":{
                        "name":"Lettuce"
                     },
                     "files":{

                     }
                  },
                  "cucumber":{
                     "info":{
                        "name":"Cucumber"
                     },
                     "files":{

                     }
                  }
               }
            },
            "orange vegetables":{
               "info":{
                  "name":"Orange Vegetables"
               },
               "files":{

               },
               "directories":{
                  "3 deep":{
                     "info":{
                        "name":"Carrot"
                     },
                     "files":{

                     }
                  }
               }
            }
         }
      },
      "fruit":{
         "info":{
            "name":"Fruit"
         },
         "files":{

         },
         "directories":{
            "apple":{
               "info":{
                  "name":"Apple"
               },
               "files":{

               }
            }
         }
      }
   }
}

循环应该创建一个嵌套的 html 列表，如下所示:

<ul>
    <li>Vegetables
        <ul>
            <li>Green Vegetables
                <ul>
                    <li>Lettuce</li>
                    <li>Cucumber</li>
                </ul>
            </li>
            <li>Orange Vegetables
                <ul>
                    <li>Carrot</li>
                </ul>
            </li>
        </ul>
    </li>
    <li>Fruit
        <ul>
            <li>Apple</li>
        </ul>
    </li>
</ul>

目前我的函数看起来像这样，但目前它在第一个列表项之后卡住了，我正在努力思考如何正确地递归调用自身:

function loopFilters(val){
    app.navList.push('<ul>');
    $.each(val.directories, function(i, val) {
        app.navList.push('<li>' + directory);
        if(val){
            // console.log('yes', val.directories);
            app.core.addFiltersToPage(val.directories)
        }
        app.navList.push('</li>');
    });
    app.navList.push('</ul>');
}

如何重写我的函数以使用我的 Javascript 对象？

Answer 1

您可以通过获取目录对象并构建一个新的 <ul> 来采用递归方法。以名称作为值列出并检查嵌套目录属性。

function getList(directories) {
    return Object
        .values(directories)
        .reduce((ul, { info: { name }, directories }) => {
            var li = document.createElement('li');
            li.appendChild(document.createTextNode(name));
            ul.appendChild(li);
            if (directories) {
                li.appendChild(getList(directories));
            }
            return ul;
        }, document.createElement('ul'));
}

var data = { directories: { vegetables: { info: { name: "Vegetables" }, files: {}, directories: { "green vegetables": { info: { name: "Green Vegetables" }, files: {}, directories: { lettuce: { info: { name: "Lettuce" }, files: {} }, cucumber: { info: { name: "Cucumber" }, files: {} } } }, "orange vegetables": { info: { name: "Orange Vegetables" }, files: {}, directories: { "3 deep": { info: { name: "Carrot" }, files: {} } } } } }, fruit: { info: { name: "Fruit" }, files: {}, directories: { apple: { info: { name: "Apple" }, files: {} } } } } };

document.body.appendChild(getList(data.directories));

.as-console-wrapper { max-height: 100% !important; top: 0; }