javascript - 将对象转换为 ul li 元素

Question

我有一个数组中的对象列表

var myLevel = ['sub', 'topic', 'type']

var myCollection = new Array();
myCollection.push({sub: 'Book 1', topic: 'topic 1', type: 'mcq'});
myCollection.push({sub: 'Book 1', topic: 'topic 1', type: 'mcq'});
myCollection.push({sub: 'Book 1', type: 'fib', topic: 'topic 2'});
myCollection.push({sub: 'Book 1', topic: 'topic 1', type: 'mtf'});
myCollection.push({sub: 'Book 1', topic: 'topic 1', type: 'mcq'});
myCollection.push({sub: 'Book 2', type: 'mcq', topic: 'topic 1'});
myCollection.push({sub: 'Book 2', topic: 'topic 1', type: 'mcq'});
myCollection.push({sub: 'Book 2', topic: 'topic 1', type: 'mcq'});

我想使用 ul 和 li 将这些内容转换为正确的列表，列表的级别也取决于 myLevel 变量。

• 第 1 册
  • 主题 1
    • mcq
    • mtf
  • 主题 2
    • 谎言
• 第 2 册
  • 主题 1
    • mcq

每个部分都有一个独特的子项，不能有相同的。

我尝试将元素创建到 myCollection 的循环中

for(var i=0; i<myCollection.length; i++)
{
    for(var j=0; j<myLevel.length; j++)
    {
        createMyTree(myCollection[i][myLevel[j]);
    }
}


function createMyTree(str)
{
     //?????????????
}

请帮助我如何在所需的级别上创建元素。

Answer 1

好的，所以我重新做了它，它可以工作，除非有一个问题:主题 1 get 被分成两个主题 1，因为主题 2 get 插入在它们之间。

var myLevel = ['sub', 'topic', 'type'];

var myCollection = new Array();
myCollection.push({sub: 'Book 1', topic: 'topic 1', type: 'mcq'});
myCollection.push({sub: 'Book 1', topic: 'topic 1', type: 'mcq'});
myCollection.push({sub: 'Book 1', type: 'fib', topic: 'topic 2'});
myCollection.push({sub: 'Book 1', topic: 'topic 1', type: 'mtf'});
myCollection.push({sub: 'Book 1', topic: 'topic 1', type: 'mcq'});
myCollection.push({sub: 'Book 2', type: 'mcq', topic: 'topic 1'});
myCollection.push({sub: 'Book 2', topic: 'topic 1', type: 'mcq'});
myCollection.push({sub: 'Book 2', topic: 'topic 1', type: 'mcq'});

var dom="<ul>";
var used = new Array();
var currentItems = new Array(myLevel.length);
var lastJ = -1;

for(var i=0; i<myCollection.length; i++)
{
    var con = false;
    for(var k=0; k<used.length; k++){
        if(compareObjects(used[k], myCollection[i]))
            con = true;
    }
    if(!con){
        for(var j=0; j<myLevel.length; j++){
            if(currentItems[j] !== myCollection[i][myLevel[j]]){
                if(lastJ !== -1){
                    for(var l=0; l<lastJ-j; l++){
                        dom+="</ul></li>";   
                    }
                }
                for(var l=j+1; l<currentItems.length; l++)
                    currentItems[l] = "";
                currentItems[j] = myCollection[i][myLevel[j]];
                dom+="<li>"+currentItems[j]+(j<myLevel.length-1?"<ul>":"");
                lastJ = j;
            }
        }
        used.push(myCollection[i]);
    }
}
dom+="</ul>";
$('body').html(dom);

function compareObjects(obj1, obj2){
    if(obj1.length != obj2.length)
        return false;
    for(var el in obj1){
        if(obj2[el] === undefined)
            return false;
        if(obj1[el] !== obj2[el])
            return false;
    }
    return true;
}