Question

我需要根据parent_id添加深度类。

Json数据：

[
{"id":1,"name":"one","parent_id":0},
{"id":2,"name":"two","parent_id":0},
{"id":3,"name":"three","parent_id":0},
{"id":4,"name":"four","parent_id":0},
{"id":5,"name":"five","parent_id":0},
{"id":6,"name":"one","parent_id":2},
{"id":7,"name":"two","parent_id":6},
{"id":8,"name":"three","parent_id":6},
{"id":9,"name":"four","parent_id":8},
{"id":10,"name":"five","parent_id":8},
]

结果应为：

<ul class="menu">
    <li class="depth-0 menu-item-1"><li>
    <li class="depth-0 menu-item-2"><li>
    <li class="depth-1 menu-item-6"><li>
    <li class="depth-2 menu-item-8"><li>
    <li class="depth-3 menu-item-9"><li>
    <li class="depth-3 menu-item-10"><li>
    <li class="depth-2 menu-item-7"><li>
    <li class="depth-0 menu-item-3"><li>
    <li class="depth-0 menu-item-4"><li>
    <li class="depth-0 menu-item-5"><li>
</ul>

我试过了

$.each(data, function(i, item) {
    if(item.parent_id > 0){
        $(this).addClass('depth-1');
    }
});

如果项parent_id为0，那么如果项目包含depth-0 parent_id，则类应为(child item)，那么类应为depth-1，如果有(sub child item) depth-2。任何人都可以指导我怎么做？

Answer 1

尝试这种方式：

var depths = [];

$.each(data, function(i, item) {
    depths[item.id] = (depths[item.parent_id] || 0) + 1;
});

这会给你一个深度数组（从1开始）

所以对于数据

var data = [
{"id":1,"name":"one","parent_id":0},
{"id":2,"name":"two","parent_id":0},
{"id":3,"name":"three","parent_id":0},
{"id":4,"name":"four","parent_id":0},
{"id":5,"name":"five","parent_id":0},
{"id":6,"name":"one","parent_id":2},
{"id":7,"name":"two","parent_id":6},
{"id":8,"name":"three","parent_id":6},
{"id":9,"name":"four","parent_id":8},
{"id":10,"name":"five","parent_id":8},
];

深度数组将是：

[undefined, 1, 1, 1, 1, 1, 2, 3, 3, 4, 4]

即菜单项1的深度为1，菜单项6的深度为2 ......与您的示例类似。

现在迭代深度阵列＆amp;生成菜单项......

Answer 2

实现loxxi的答案你可以这样做：

$.each(data, function(i, item) {
    depthsTemp[item.id] = (depthsTemp[item.parent_id] || 0) + 1;
});
depths = $.map(depthsTemp, function(item) {
    return --item;
}).splice(1);
function buildList(depthList) {
    var html = '<ul class="menu">\n';
    for (var i = 0; i < depthList.length; i++) {
        html += '<li class="depth-' + depthList[i] + ' menu-item-' + (i + 1) + '"></li>\n';
    }
    html += '</ul>';
    return html;
}

请参阅此<{p>}的working JSFiddle

需要根据父ID添加深度类

2 个答案: