将 JSON 转换为 HTML 树

Question

I would like to generate an HTML tree (preferably UL-LI) from the JSON example below. Does anyone have a simple , recursive JS function (not a framework) that can handle this specific structure? Thanks for your help!

{ "folder" : [ {
    "title" : "1",
    "folder" : [ {
        "title" : "1.1",
        "folder" : [ {
            "title" : "1.1.1",
        } , {
            "title" : "1.1.2",
        } ]
    } ]
} , {
    "title" : "2",
} ] }

Answer 1

function to_ul (obj) {
  // --------v create an <ul> element
  var f, li, ul = document.createElement ("ul");
  // --v loop through its children
  for (f = 0; f < obj.folder.length; f++) {
    li = document.createElement ("li");
    li.appendChild (document.createTextNode (obj.folder[f].title));
    // if the child has a 'folder' prop on its own, call me again
    if (obj.folder[f].folder) {
      li.appendChild (to_ul (obj.folder[f].folder));
    }
    ul.appendChild (li);
  }
  return ul;
}

Caveat: No error checking! If a 'title' or 'folder' is missing, the whole thing could blow up.

Answer 2

I had a problem getting my browser to accept the data structure submitted by the OP, but here is a fully working example I've drawn up for my own, similar purposes. Beside the function I provide the data structure as well, with name/branches instead of title/folder.

 function to_ul(branches) { var ul = document.createElement("ul"); for (var i = 0, n = branches.length; i < n; i++) { var branch = branches[i]; var li = document.createElement("li"); var text = document.createTextNode(branch.name); li.appendChild(text); if (branch.branches) { li.appendChild(to_ul(branch.branches)); } ul.appendChild(li); } return ul; } function renderTree() { var treeEl = document.getElementById("tree"); var treeObj = { "root": [{ "name": "George & Sarah Trede", "branches": [{ "name": "George & Frances Trede", "branches": [{ "name": "Mary (Trede) Jempty" }, { "name": "Carol (Trede) Moeller" }] }, { "name": "Mary (Trede) Sheehan" }, { "name": "Ward Trede" }] }] }; treeEl.appendChild(to_ul(treeObj.root)); } renderTree()

 <div id="tree"></div>

Answer 3

我过去曾在这种事情上使用过PURE并取得了一些成功。

Answer 4

Check out the jquery plugin JSON2HTML, it's a little simpler to use than PURE and I've used it on a couple of site's I've created.

http://json2html.com

Answer 5

function to_li(obj, name) {
    var li = document.createElement("li");
    if (typeof(name) != "undefined") {
        var strong = document.createElement("strong");
        strong.appendChild(document.createTextNode(name + ": "));
        li.appendChild(strong);
    }
    if (typeof(obj) != "object"){
        li.appendChild(document.createTextNode(obj));
    } else {
        var ul = document.createElement ("ul");
        for (var prop in obj){
            ul.appendChild(to_li(obj[prop],prop));
        }
        li.appendChild(ul);
    }
    return li;
}

Answer 6

@Boldewyn: I believe you can also use a For...In loop instead of a regular For loop to shorten the code a bit. Of course, I don't have much experience using this kind of loop, so please check my code snippet.

for (var i in obj.folder) {
    li = document.createElement ("li");
    li.appendChild (document.createTextNode (i.title));
    // if the child has a 'folder' prop on its own, call me again
    if (i.folder) {
      li.appendChild (to_ul (i.folder));
    }
}