監測滾動條 ScrollSpy
在單頁設計中，我們常會把整個頁面分成幾個區塊，
然後在上方或側邊選單中以這些區塊的標題來做為選單項目。
而當我們點選選單項目時，頁面會自動跳到該區塊，
而選單項目會反白或反黑。反過來如果藉由滑鼠捲動到該區塊時
(即該區塊佔了螢幕高度一定比例的大小) ，
該區塊的選單項目也會自動反白。這個效果就稱為「 ScrollSpy 」。
<!DOCTYPE html> <html> <head> <title>Bootstrap Example</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css"> <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script> <script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script> <style> #section1 {padding-top:50px;height:500px;color: #fff; background-color: #1E88E5;} #section2 {padding-top:50px;height:500px;color: #fff; background-color: #673ab7;} #section3 {padding-top:50px;height:500px;color: #fff; background-color: #ff9800;} #section41 {padding-top:50px;height:500px;color: #fff; background-color: #00bcd4;} #section42 {padding-top:50px;height:500px;color: #fff; background-color: #009688;} </style> </head> <body data-spy="scroll" data-target=".navbar" data-offset="50"> <nav class="navbar navbar-inverse navbar-fixed-top"> <div class="container-fluid"> <div class="navbar-header"> <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#myNavbar"> <span class="icon-bar"></span> <span class="icon-bar"></span> <span class="icon-bar"></span> </button> <a class="navbar-brand" href="#">WebSiteName</a> </div> <div> <div class="collapse navbar-collapse" id="myNavbar"> <ul class="nav navbar-nav"> <li><a href="#section1">Section 1</a></li> <li><a href="#section2">Section 2</a></li> <li><a href="#section3">Section 3</a></li> <li class="dropdown"><a class="dropdown-toggle" data-toggle="dropdown" href="#">Section 4 <span class="caret"></span></a> <ul class="dropdown-menu"> <li><a href="#section41">Section 4-1</a></li> <li><a href="#section42">Section 4-2</a></li> </ul> </li> </ul> </div> </div> </div> </nav> <div id="section1" class="container-fluid"> <h1>Section 1</h1> </div> <div id="section2" class="container-fluid"> <h1>Section 2</h1> </div> <div id="section3" class="container-fluid"> <h1>Section 3</h1> </div> <div id="section41" class="container-fluid"> <h1>Section 4 Submenu 1</h1> </div> <div id="section42" class="container-fluid"> <h1>Section 4 Submenu 2</h1> </div> </body> </html>
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