如何从JSON数据递归创建UL/LI-多层深入 [英] How can I recursively create a UL/LI's from JSON data - multiple layers deep
问题描述
我正在尝试使用以下JSON数据在递归内部函数中创建以下类似结构，但运气并不好，确实需要一些帮助，因此如果有人可以帮助，请这样做.预先谢谢你.
I am trying to use use the following JSON data to create the following similar structure in a recursive inner function with not much luck, really need some help and so if anyone can assist please do. Thank you in advance.
<ul>
<li></li>
<li>
<a href=""></a>
<div>
<ul>
<li>
<a href=""></a>
<div>
....etc
</div>
</li>
</ul>
</div>
</li>
</ul>
我正在使用的JSON数据如下:
the JSON data I am using is as follows:
var JSON = {
menu: [
{id: '0',sub: [
{name: 'lorem ipsum 0-0',link: '0-0', sub: null},
{name: 'lorem ipsum 0-1',link: '0-1', sub: null},
{name: 'lorem ipsum 0-2',link: '0-2', sub: null}
]
},
{id: '1',sub: null},
{id: '2',sub: [
{name: 'lorem ipsum 2-0',link: '2-0', sub: null},
{name: 'lorem ipsum 2-1',link: '2-1', sub: null},
{name: 'lorem ipsum 2-2',link: '2-2', sub: [
{name: 'lorem ipsum 2-2-0',link: '2-2-0', sub: null},
{name: 'lorem ipsum 2-2-1',link: '2-2-1', sub: null},
{name: 'lorem ipsum 2-2-2',link: '2-2-2', sub: null},
{name: 'lorem ipsum 2-2-3',link: '2-2-3', sub: null},
{name: 'lorem ipsum 2-2-4',link: '2-2-4', sub: null},
{name: 'lorem ipsum 2-2-5',link: '2-2-5', sub: null},
{name: 'lorem ipsum 2-2-6',link: '2-2-6', sub: null}
]},
{name: 'lorem ipsum 2-3',link: '2-3', sub: null},
{name: 'lorem ipsum 2-4',link: '2-4', sub: null},
{name: 'lorem ipsum 2-5',link: '2-5', sub: null}
]
},
{id: '3',sub: null}
]
}
和我创建的代码(不完整，这是我需要帮助的脑筋急转弯)是:
and the code I have created (incomplete, this is the brain teaser I need help on) is:
$(function(){
$.fn.dropdown = function(settings){
var that = this;
var settings = $.extend({}, $.fn.dropdown.defaults, settings);
var methods = {
isArray: function(o){
return Object.prototype.toString.call(o) === '[object Array]';
},
createDropdownCode: function(arr){
var menu = arr.menu;
var html = null;
var menusort = function(menu){
html = that;
that.find("li").each(function(idx){
var menuList = menu[idx].sub;
var baseContainer = $(this);
var count = -1;
var subsort = (function(){
count += 1;
return function(submenu, pb){
var subblock;
subblock = $("<div />").append('<ul />');
if(methods.isArray(submenu)){
for(var i=0;i<submenu.length;i++){
var l = $("<li />").append("<a href='"+ submenu[i].link +"'>"+ submenu[i].name +"</a>");
subblock.find('ul').append(l);
if(pb !== undefined && i == submenu.length-1){
pb.append(subblock)
}
if(methods.isArray(submenu[i].sub)){
subsort(submenu[i].sub, subblock.find('ul li').eq(i));
}
}
}
}
})()
subsort(menuList)
})
}
menusort(menu);
return null; //html !== null ? html.html() : null;
},
init: function(){
// filter through json
// create the div=>ul=>li
if(settings.jsonData === undefined || settings.jsonData === null){
console.warn('No JSON Data passed')
return;
}else{
if(!methods.isArray(settings.jsonData.menu)){
console.warn('No JSON Data passed')
return; // error, no data!
}
}
//var html = methods.createBlock(settings.jsonData.menu[0].sub);
var html = methods.createDropdownCode(settings.jsonData);
//console.log(html)
}
}
methods.init();
return that;
}
$.fn.dropdown.defaults = {
jsonData: null
}
})
$('#menu').dropdown({
jsonData: JSON
});
使用了集成代码，这要归功于个人给出了足够接近的答案-尽管还会研究其他人.
integrated code used, thanks to the individual that gave a close enough answer - Although will study the others.
$.fn.dropdown = function(settings){
var that = this;
var settings = $.extend({}, $.fn.dropdown.defaults, settings);
var methods = {
createDropDownCode: function(arr){
// loop through li's of primary menu
that.find("li").each(function(idx){
$(this).append( menusort(arr.menu[idx].sub) );
function menusort(data){
if(data !== null)
var html = "<div><ul>";
for(item in data){
html += "<li>";
if(typeof(data[item].sub) === 'object'){
html += "<a href='" + data[item].link + "'>" + data[item].name + "</a>";
if($.isArray(data[item].sub))
html += menusort(data[item].sub);
}
html += "</li>"
}
if(data !== null)
html += "</ul></div>";
return html;
}
})
},
init: function(){
var html = methods.createDropDownCode(settings.jsonData);
}
}
methods.init();
}
推荐答案
您可以尝试使用我刚刚编写的此递归函数:
You can try this recursive function I've just coded:
function buildList(data, isSub){
var html = (isSub)?'<div>':''; // Wrap with div if true
html += '<ul>';
for(item in data){
html += '<li>';
if(typeof(data[item].sub) === 'object'){ // An array will return 'object'
if(isSub){
html += '<a href="' + data[item].link + '">' + data[item].name + '</a>';
} else {
html += data[item].id; // Submenu found, but top level list item.
}
html += buildList(data[item].sub, true); // Submenu found. Calling recursively same method (and wrapping it in a div)
} else {
html += data[item].id // No submenu
}
html += '</li>';
}
html += '</ul>';
html += (isSub)?'</div>':'';
return html;
}
它将返回菜单的html，因此请像这样使用它:var html = buildList(JSON.menu, false);
It returns the html for the menu, so use it like that: var html = buildList(JSON.menu, false);
我相信它会更快，因为它使用的是纯JavaScript，并且不会为每次迭代创建文本节点或DOM元素.完成后，只需在结束时调用.innerHTML或$('...').html()即可，而不是立即为每个菜单添加HTML.
I believe it is faster because it's in pure JavaScript, and it doesn't create text nodes or DOM elements for every iteration. Just call .innerHTML or $('...').html() at the end when you're done instead of adding HTML immediately for every menu.
JSFiddled: http://jsfiddle.net/remibreton/csQL8/
JSFiddled: http://jsfiddle.net/remibreton/csQL8/
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