Rumah > Artikel > hujung hadapan web > Bootstrap学习js插件篇之滚动监听_html/css_WEB-ITnose
1、滚动监听
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。Bootstrap中文网左侧就是一个滚动监听的例子。
代码段:
[html] view plaincopy
[html] view plaincopy
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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.
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预览:
通过为需要监听的页面元素(一般是
)添加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。
<body data-spy="scroll" data-target=".navbar-example"> ... <div class="navbar-example"> <ul class="nav nav-tabs"> ... </ul> </div> ... </body>
通过JavaScript启动滚动监听:
$('body').scrollspy({ target: '.navbar-example' })
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
。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') })
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=""。
offset | number | 10 | Pixels to offset from top when calculating position of scroll. |
activate.bs.scrollspy | 当滚动监听插件将某个元素置为active时,此事件被触发。 |
$('#myScrollspy').on('activate.bs.scrollspy', function () { // do something… })