站长之家 - 经验 2015-04-10T09:50:50 +08:00

Bootstrap3.0学习教程十九:JavaScript插件滚动监听

完整教程可查看:Bootstrap3.0教程

本文主要来学习一下JavaScript插件--滚动监听

滚动监听

案例

滚动监听插件可以根据滚动条的位置自动更新所对应的导航标记。你可以试试滚动这个页面,看看左侧导航的变化。

先把实现的代码上了,你可以通过测试代码先来看看效果。




Bootstrap
"viewport" content="width=device-width, initial-scale=1.0">

  • "css/bootstrap.min.css" rel="stylesheet" media="screen">
    if lt IE 9]>
    "https://oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js">

    "https://oss.maxcdn.com/libs/respond.js/1.3.0/respond.min.js">


    "text/css"> .scrollspy-example
    {
    height: 200px;
    overflow: auto;
    position: relative;
    border:1px solid red;
    }



    class="container" >
    "navbar-example" class="navbar navbar-default navbar-static" role="navigation">
    class="navbar-header">
    class="navbar-toggle" type="button" data-toggle="collapse" data-target=".bs-js-navbar-scrollspy">
    class="sr-only">Toggle navigation
    class="icon-bar">
    class="icon-bar">
    class="icon-bar">

    Project Name

    class="collapse navbar-collapse bs-js-navbar-scrollspy">



    "0" class="scrollspy-example" data-spy="scroll" data-target="#navbar-example">
    "fat">@fat

    Ad leggings keytar, brunch id art party dolor labore. Pitchfork yr enim lo-fi before they sold
    out qui. Tumblr farm-to-table bicycle rights whatever. Anim keffiyeh carles cardigan. Velit seitan
    mcsweeney's photo booth 3 wolf moon irure. Cosby sweater lomo jean shorts, williamsburg hoodie
    minim qui you probably haven't heard of them et cardigan trust fund culpa biodiesel wes anderson
    aesthetic. Nihil tattooed accusamus, cred irony biodiesel keffiyeh artisan ullamco consequat.


    "mdo">@mdo

    Veniam marfa mustache skateboard, adipisicing fugiat velit pitchfork beard.
    Freegan beard aliqua cupidatat mcsweeney's vero. Cupidatat four loko nisi, ea helvetica nulla carles.
    Tattooed cosby sweater food truck, mcsweeney's quis non freegan vinyl. Lo-fi wes anderson +1
    sartorial. Carles non aesthetic exercitation quis gentrify. Brooklyn adipisicing craft beer vice keytar
    deserunt.

    "one">one

    Occaecat commodo aliqua delectus.
    Fap craft beer deserunt skateboard ea. Lomo bicycle rights adipisicing banh mi, velit ea sunt next
    level locavore single-origin coffee in magna veniam. High life id vinyl, echo park consequat quis
    aliquip banh mi pitchfork. Vero VHS est adipisicing. Consectetur nisi DIY minim messenger bag.
    Cred ex in, sustainable delectus consectetur fanny pack iphone.


    "two">two

    In incididunt echo park, officia deserunt mcsweeney's proident master cleanse thundercats
    sapiente veniam. Excepteur VHS elit, proident shoreditch +1 biodiesel laborum craft beer. Single-origin
    coffee wayfarers irure four loko, cupidatat terry richardson master cleanse. Assumenda you probably
    haven't heard of them art party fanny pack, tattooed nulla cardigan tempor ad. Proident wolf nesciunt
    sartorial keffiyeh eu banh mi sustainable. Elit wolf voluptate, lo-fi ea portland before they sold out four
    loko. Locavore enim nostrud mlkshk brooklyn nesciunt.


    "three">three

    Ad leggings keytar, brunch id art party dolor labore. Pitchfork yr enim lo-fi before they sold
    out qui. Tumblr farm-to-table bicycle rights whatever. Anim keffiyeh carles cardigan. Velit seitan
    mcsweeney's photo booth 3 wolf moon irure. Cosby sweater lomo jean shorts, williamsburg
    hoodie minim qui you probably haven't heard of them et cardigan trust fund culpa biodiesel wes
    anderson aesthetic. Nihil tattooed accusamus, cred irony biodiesel keffiyeh artisan ullamco consequat.


    Keytar twee blog, culpa messenger bag marfa whatever delectus food truck. Sapiente
    synth id assumenda. Locavore sed helvetica cliche irony, thundercats you probably haven't heard
    of them consequat hoodie gluten-free lo-fi fap aliquip. Labore elit placeat before they sold out,
    terry richardson proident brunch nesciunt quis cosby sweater pariatur keffiyeh ut helvetica artisan.
    Cardigan craft beer seitan readymade velit. VHS chambray laboris tempor veniam. Anim mollit
    minim commodo ullamco thundercats.




    "js/jquery-2.0.3.min.js">

    "js/bootstrap.min.js">


  • View Code

    然后运行后,在内容下,也就是有滚动条哪里滚动鼠标齿轮,即可看到效果。

    用法1--通过data属性

    通过为需要监听的页面元素(一般是)不过在上面添加在了Div上面,你可以自己看看代码就明白了。然后给div添加属性data-spy="scroll"就可很轻松的为顶部导航条添加滚动监听功能。然后为其添加data-target属性,此属性的值为任何Bootstrap中.nav组件的父元素的ID或class。

    "0" class="scrollspy-example" data-spy="scroll" data-target="#navbar-example">
    ........

    导航链接地址必须有对应的目标

    导航条内的链接地址必须有对应的页面元素具有同样的ID值。例如,home必须对应DOM中例如

    用法2--通过JavaScript

    通过JavaScript启动滚动监听:

        "text/javascript"> $(function () {
    $('.scrollspy-example').scrollspy({ target:'#navbar-example' });
    })

    通过将样式类为scrollspy-example的div,去掉它的data-target属性。这样同样可以进行鼠标滚轮的切换。

    方法

    .scrollspy('refresh')

    使用滚动监听插件时,每当页面中从DOM中增加或删除页面元素时,都需要调用此方法以,如下:

    $('[data-spy="scroll"]').each(function () { var $spy = $(this).scrollspy('refresh') })

    不过暂时还没用到。

    选项

    可以将选项通过data属性或JavaScript传递。对于data属性,需要将选项名称放到data-之后,例如data-offset=""。

    事件

     "text/javascript"> $('#navbar-example').on('activate.bs.scrollspy', function () {
    alert(1);
    })

     最后注意:针对滚动监听的内容当然要添加滚动条,也就是要预先添加样式

     

         "text/css"> .scrollspy-example
    {
    height: 200px;
    overflow: auto;
    position: relative;
    border:1px solid red;
    }

    给与Div内容一定的高度。

    总结

    纠结了很久,就是因为针对内容那里没有滚动条。这一点一定记住勒。

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