將介紹如何用AngularJS構建一個強大的web前端系統。angularjs是由Google團隊開發的一款非常優秀web前端框架。在當前如此多的web框架下，AngularJS能脫穎而出，從架構設計上就高人一等，雙向數據綁定，依賴注入，指令，MVC，模板。Angular.js創新地把后臺技術融入前端開發，掃去jQuery一度的光芒。用angularjs就像寫后臺代碼，更規范，更結構化，更可控。
本文將介紹如何實現多限級導航菜單。
目錄
1.靜態多級菜單實現
2.動態多級菜單實現
1. 靜態多級菜單實現
要實現多級菜單，我們要分兩步走，第一步就是把靜態菜單的功能實現，通過純靜態的HTML代碼完成。第二步，通過Angluarjs進行動態實現，最后把數據和程序分離，通過Ajax加載多級菜單數據。
我們先從靜態多級菜單開始動手，一個六級導航菜單是什么樣子呢？
如上圖所示，我們定義一些功能需求。
1級菜單是導航條上的文字。
當1級菜單導航事件被觸發，顯示2級菜單導航，在1級菜單的正下方顯示。
當2級菜單導航事件被觸發，顯示3級菜單導航，在2級菜單的右方顯示。
當3級菜單導航事件被觸發，顯示4級菜單導航，在3級菜單的右方顯示。
以此類推，不考慮下級菜單顯示出界問題。
繼續上文中的項目環境，增加一個新HTML文件: page3.html
~ vi D:/workspace/javascript/angular-navbar/page3.html<!DOCTYPE html><html lang="zh-cn"><head> <meta charset="utf-8"> <title>多級導航菜單</title> <meta name="description" content="多級導航菜單"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta name="fragment" content="!" /> <link rel="stylesheet" href="/bower_components/bootstrap/dist/css/bootstrap.min.css" rel="external nofollow" rel="external nofollow" > <link rel="stylesheet" href="/css/main.css" rel="external nofollow" rel="external nofollow" ></head><body ng-app="page2"><div class="container"> <div class="row" ng-controller="NavbarCtrl"> <nav class="navbar navbar-default" role="navigation"> <div class="navbar-header"> <a class="navbar-brand" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >多級菜單導航</a> </div> <div class="collapse navbar-collapse navbar-ex1-collapse"> <ul class="nav navbar-nav"> <li class="active"><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >Link</a></li> <li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >Link</a></li> <li class="dropdown"> <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="dropdown-toggle" data-toggle="dropdown">Multi Level <b class="caret"></b></a> <ul class="dropdown-menu menu-top"> <li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >Level 1</a></li> <li class="dropdown-submenu"> <a tabindex="-1" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >More options</a> <ul class="dropdown-menu"> <li><a tabindex="-1" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >Level 2</a> </li> <li class="dropdown-submenu"> <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >More..</a> <ul class="dropdown-menu"> <li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >Level 3</a> </li> <li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >Level 3</a> </li> <li class="dropdown-submenu"> <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >More..</a> <ul class="dropdown-menu"> <li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >Level 4</a> </li> <li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >Level 4</a> </li> <li class="dropdown-submenu"> <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >More..</a> <ul class="dropdown-menu"> <li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >Level 5</a> </li> <li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >Level 5</a> </li> </ul> </li> </ul> </li> </ul> </li> <li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >Level 2</a> </li> <li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >Level 2</a> </li> </ul> </li> <li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >Level 1</a></li> </ul> </li> </ul> </div> </nav> </div></div><script src="/bower_components/jquery/dist/jquery.min.js"></script><script src="/bower_components/angular/angular.min.js"></script><script src="/bower_components/bootstrap/dist/js/bootstrap.min.js"></script><script src="/bower_components/angular-route/angular-route.min.js"></script><script src="/bower_components/angular-bootstrap/ui-bootstrap-tpls.min.js"></script><script src="/js/app.js"></script></body></html>
新建一個css文件：main.css
~ vi D:/workspace/javascript/angular-navbar/css/main.css.dropdown:hover .menu-top { display: block;}.dropdown-submenu{ position:relative;}.dropdown-submenu > .dropdown-menu{ top:0; left:100%; margin-top:-6px; margin-left:-1px; -webkit-border-radius:0 6px 6px 6px; -moz-border-radius:0 6px 6px 6px; border-radius:0 6px 6px 6px;}.dropdown-submenu:hover > .dropdown-menu{ display:block;}.dropdown-submenu > a:after{ display:block; content:" "; float:right; width:0; height:0; border-color:transparent; border-style:solid; border-width:5px 0 5px 5px; border-left-color:#cccccc; margin-top:5px; margin-right:-10px;}.dropdown-submenu:hover > a:after{ border-left-color:#ffffff;}.dropdown-submenu .pull-left{ float:none;}.dropdown-submenu.pull-left > .dropdown-menu{ left:-100%; margin-left:10px; -webkit-border-radius:6px 0 6px 6px; -moz-border-radius:6px 0 6px 6px; border-radius:6px 0 6px 6px;}刷新一下網頁，我們能就看到上面的截圖的效果，代碼參考：http://firdaus.grandexa.com/2013/09/twitter-bootstrap-3-multilevel-dropdown-menu/
通過HTML和CSS就實現了多級菜單的靜態展示效果，如果導航菜單不是經常變化，那么用靜態的方式，把代碼寫死就可以了。但有一些場景，菜單是需要動態生成，比如通過權限控制訪問鏈接，每個用戶的權限不一樣，那么能看到的菜單選項也就不一樣，這個時候就需要做成動態的，用程序去控制菜單的加載和展示。
2. 動態多級菜單實現
有了靜態多級導航菜單的HTML代碼結構，改寫成動態的，其實也不太復雜。
我們需要做2件事：
把導航菜單的數據結構化存儲，比如 存放到文件 nav.json。
用Angularjs的API加載nav.json數據，進行展示。
我們先定義一下導航菜單的數據格式，以JSON格式定義，每個菜單項都有3個屬性字段
label: 導航菜單項顯示的名字。
link: 導航菜單項的跳轉鏈接，可以不定義。
children: 導航菜單項的子菜單，循環對象存儲。
{ "label": "levelA", "link": "#", "children": [ { "label": "levelB", "link": "#", "children": [] } ]}下面我們用真實的數據定義導航菜單，以我的金融系統為例。
新建JSON數據文件：nav.json。
~ vi D:/workspace/javascript/angular-navbar/js/nav.json[ { "label": "債券", "children": [ { "label": "可轉債", "children": [ {"label": "可轉債溢價率分析","link":"#"}, {"label": "可轉債NS定價","link":"#"}, {"label": "可轉債歸因分析","link":"#"}, {"label": "可轉債套利實時監控","link":"#"} ] }, { "label": "信用債", "children": [ {"label": "交易所債券監控","link":"#"} ] }, { "label": "利率債","link":"#", "children": [] }, { "label": "國債期貨", "children": [ {"label": "國債期貨表現分析","link":"#"}, {"label": "國債期貨實時套利監控","link":"#"}, {"label": "IRR歷史時間序列查詢","link":"#"}, {"label": "IRR實時監控","link":"#"} ] } ] }, { "label": "股票", "children": [ { "label": "基本面分析", "children": [ {"label": "上市公司基本面數據查看","link":"#"} ] }, { "label": "量化選股策略", "children": [] } ] }, { "label": "宏觀", "children": [ { "label": "宏觀數據", "children": [ {"label": "宏觀數據概覽","link":"#"} ] }, { "label": "宏觀經濟預測", "children": [] }, { "label": "宏觀經濟和大類資產表現", "children": [] } ] }]我們看到這個導航菜單的數據，有3級，“債券 主站蜘蛛池模板： 彰武县| 兰坪| 东山县| 玛沁县| 镇原县| 从化市| 若羌县| 浑源县| 克什克腾旗| 蓬溪县| 大渡口区| 理塘县| 庆阳市| 云浮市| 龙门县| 建瓯市| 海口市| 手游| 宜昌市| 集安市| 荆州市| 阜新市| 嵊州市| 吉首市| 宁陕县| 富源县| 深泽县| 清河县| 准格尔旗| 邯郸市| 历史| 仪陇县| 延吉市| 临猗县| 永福县| 翁牛特旗| 新巴尔虎左旗| 中方县| 庆安县| 永吉县| 渭源县|