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问题:

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.


                                                                                                        ....etc

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}     ] }

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 = $("
").append('
');                                  if(methods.isArray(submenu)){                                      for(var i=0;i").append(""+ submenu[i].name +"");                                          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 });

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){                  $(this).append( menusort(arr.menu[idx].sub) );                  function menusort(data){                     if(data !== null)                            var html = "";                      for(item in data){                         html += "";                         if(typeof(data[item].sub) === 'object'){                             html += "" + data[item].name + "";                             if($.isArray(data[item].sub))                                 html += menusort(data[item].sub);                         }                         html += "
"                     }                     if(data !== null)                         html += "
";                     return html;                 }             })         },         init: function(){             var html = methods.createDropDownCode(settings.jsonData);          }     }      methods.init();  }

回答1:

You can try this recursive function I've just coded:

function buildList(data, isSub){     var html = (isSub)?'':''; // Wrap with div if true     html += '';     for(item in data){         html += '';         if(typeof(data[item].sub) === 'object'){ // An array will return 'object'             if(isSub){                 html += '' + data[item].name + '';             } 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 += '
';     }     html += '
';     html += (isSub)?'
':'';     return html; }

It returns the html for the menu, so use it like that: var html = buildList(JSON.menu, false);

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/

回答2:

Make two functions makeUL and makeLI. makeUL calls makeLI on each element, and makeLI calls makeUL if there's sub elements:

function makeUL(lst) {     ...     $(lst).each(function() { html.push(makeLI(this)) });     ...     return html.join("\n"); }  function makeLI(elem) {     ...     if (elem.sub)         html.push('' + makeUL(elem.sub) + '
');     ...     return html.join("\n"); }

http://jsfiddle.net/BvDW3/

Needs to be adapted to your needs, but you got the idea.

回答3:

This solution uses a single recursive function. I simplified logic by using Array's map() prototype function.

$(function () {     $("body").html(makeUnorderedList(getData().menu)); });  function makeUnorderedList(data, li) {     return $('').append(data.map(function (el) {         var li = li || $('');         if (el.id || el.link) li.append($('', {             text : el.id || el.link,             href : '#' + (el.id || el.link),             name : el.name         }));         if (el.sub) li.append(makeUnorderedList(el.sub, li));         return li;     })); }  function getData() {     return {         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         }]     }; }

Extension

Here is a more dynamic approach. You get to choose how your list items are rendered and what the child property is. The mapFunc paramater is a callback that gives you access to the current child node and its parent.

The scope of the mapFunc is the item. So you could use item as well as this to refer to said item.

$(function () {     $("body").html(makeUnorderedList(getData().menu, function(item, index, parent) {       // `item` and `this` are the same.       return $('', {             text : (item.id || item.link),             href : '#' + (item.id || item.link),             name : item.name,             'data-index' : index         });     }, 'sub')); });  function makeUnorderedList(data, mapFunc, childProp, li, parent) {     return $('').append(data.map(function (el, index) {         var li = li || $('');         li.append(mapFunc.call(el, el, index, parent));         if (el[childProp]) {             li.append(makeUnorderedList(el[childProp], mapFunc, childProp, li, data));         }         return li;     })); }

回答4:

Fiddle

Code:

JS

var jsonstring = [{   "id": '1',   "children": [{     "id": '2'   }, {     "id": '3',     "children": [{       "id": '4'     }]   }] }, {   "id": '5' }];   var htmlStr= recurse( jsonstring ); $('#test').append(htmlStr);   function recurse( data ) {   var htmlRetStr = "";    for (var key in data) {          if (typeof(data[key])== 'object' && data[key] != null) {         var x=key*1;                 if(isNaN(x)){             htmlRetStr += "" + key + ":";             }             htmlRetStr += recurse( data[key] );             htmlRetStr += '
';         } else {             htmlRetStr += ("" + key + ': "' + data[key] + '"
' );         }   };   htmlRetStr += '
';       return( htmlRetStr ); }

HtML

CSS

li ul ul li {     padding-left: 10px; }  li ul ul ul {     padding: 0px; }

回答5:

This is like a complete solution for generating UL/LI recursively from JSON config, which has customizable classes for each node and support of expand and collapse events for each node. This provides just a basic working model, from which you ll be able to expand and customize to your needs.

I found this answer from https://techmeals.com/fe/questions/javascript/6/How-can-I-create-a-dynamic-tree-of-UL-and-LI-from-JSON-config

Example JSON config file:

var config = {     "Menu-1-Level-1": {         "label": "Menu-1-Level-1",         "type": "treeView",         "class": "Menu-1-Level-1",         "children": [             {                 label: "Menu-1-Level-2",                 type: "treeView",                 "class": "Menu-1-Level-2",                 children: [                     {                         label: "Menu-1-Level-3",                         class: "Menu-1-Level-3"                     }                 ]             },             {                 label : "Menu-2-Level-2",                 class: "Menu-2-Level-2"             }         ]     },     "Menu-2-Level-1": {         "label": "Menu-2-Level-1",         "type": "treeView",         "class": "Menu-2-Level-1",         "children": [             {                 label: "Menu-1-Level-2",                 class: "Menu-1-Level-2",                 type: "treeView",                 children: [                     {                         label: "Menu-1-Level-3",                         class: "Menu-1-Level-3"                     }                 ]             },             {                 label : "Menu-2-Level-2",                 class : "Menu-2-Level-2"             }         ]     } };

HTML Code:

        Tree Menu

Tree.js

var tree;  tree = function (treeNodeParent, dataObj) {     this.dataObj = dataObj;     this.treeNodeParent = treeNodeParent;     this.treeNode = $(document.createElement("ul")).addClass("treeNode"); };  tree.prototype.expandCollapse = function (e) {     var target = $(e.currentTarget), parentLabel = target.parent();      if (parentLabel.hasClass("collapsed")) {         parentLabel.removeClass("collapsed").addClass("expanded");     } else {         parentLabel.addClass("collapsed").removeClass("expanded");     } };  tree.prototype.attachEvents = function () {     var me = this;     me.treeNodeParent.delegate(".collapsed label, .expanded label", "click", me.expandCollapse); };  tree.prototype.attachMarkUp = function () {     var me = this;     me.treeNodeParent.append(me.treeNode); };  tree.prototype.getEachNodeMarkup = function (nodeObj, rootNode, selector) {     var selectedNode, i, me = this;      if (nodeObj.children) {          if (!selector) {             selectedNode = rootNode;         } else {             selectedNode = rootNode.find(selector);         }          nodeObj.class = nodeObj.class ? nodeObj.class : "";         selectedNode.append($.parseHTML("" + "" + nodeObj.label + "" + "
"));         selector = selector + " li[name=" + nodeObj.label + "] > ul";          for (i = 0; i " + "" + nodeObj.label + "" + ""));     } };  tree.prototype.getTree = function () {     var component, me = this;      for (component in me.dataObj) {         if (me.dataObj.hasOwnProperty(component)) {             me.getEachNodeMarkup(me.dataObj[component], me.treeNode, "");         }     }     me.attachMarkUp();     me.attachEvents();     return me.treeNode; };

Tree.css

.treeNode .collapsed > ul, .collapsed > li {     display: none; }  .treeNode .expanded > ul, .expanded > li {     display: block; }

testPage.js

// the variable "config" is nothing but the config JSON defined initially.  treeNode = new tree($('.treeContainer .tree'), config);  treeNodeObj = treeNode.getTree();

Look at the example provided at https://jsfiddle.net/3s3k3zLL/

回答6:

I was searching for general parent child element function and I saw these answers, and I took some pieces of code from here and there and made this function. I decided to share my code as an answer, in case someone like me will find this post when he is searching for a general parent child html element draw function:

function drawRecElements(arr, html, elements) {     if (typeof (html) === 'undefined') {         var html = '';     }     if (typeof (elements) === 'undefined') {         var elements = {child: '', childClose: '
', parent: '', parentClose: '
'};     }     if (typeof (arr) === 'string') {         return elements.child + arr + elements.childClose;     } else if (typeof (arr) === 'object') {         for (i in arr) {             if (typeof (arr[i]) === 'string') {                 html += elements.parent + elements.child + i + elements.childClose + elements.child + arr[i] + elements.childClose + elements.parentClose;             } else if(typeof (i) === 'string' && (isNaN(i))){                 html += elements.parent + elements.child + i + elements.childClose + elements.child + drawRecElements(arr[i],'',elements) + elements.childClose + elements.parentClose;             } else if (typeof (arr[i]) === 'object') {                html = drawRecElements(arr[i], html,elements);             }         }     }     return html; }

https://jsfiddle.net/kxn442z5/1/

回答7:

Pure ES6

var foo=(arg)=> ` ${arg.map(elem=>     elem.sub?         `${foo(elem.sub)}
`         :`${elem.name}
`     )} 
`

JSON example

   var bar = [   {     name: 'Home'   }, {     name: 'About'   }, {     name: 'Portfolio'   }, {     name: 'Blog'   }, {     name: 'Contacts'   }, {     name: 'Features',     sub: [       {         name: 'Multipage'       }, {         name: 'Options',         sub: [           {             name: 'General'           }, {             name: 'Sidebars'           }, {             name: 'Fonts'           }, {             name: 'Socials'           }         ]       }, {         name: 'Page'       }, {         name: 'FAQ'       }     ]   } ] var result=foo(bar)

Your 'result' will be valid HTML

文章来源: How can I recursively create a UL/LI's from JSON data - multiple layers deep

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