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arale-sticky

v1.4.0

Published

实现元素跟随滚动的效果。

Downloads

2

Readme

Sticky


Build Status Coverage Status

实现侧边栏跟随滚动的效果,当滚动条滚动到一定距离时,指定区域变为 sticky 效果开始跟随页面。

例如 brunch.iobootstrap 页面左边侧边栏的效果,或着请看 演示

实现原理是支持 position: sticky 的直接使用 CSS 实现, 不支持的浏览器(除 IE6 外)使用 position: fixed,对 IE6 进行 js 模拟。

arale/fixed 改名为 arale/sticky


使用说明

Sticky(element, position, callback)

seajs.use(["$", "sticky"], function($, sticky) {
    sticky("#stick", 30, function(status) {
        if (status) {
            seajs.log("stick");
        } else {
            seajs.log("unstick");
        }
    });
});

element 是指需要跟随滚动的目标元素,接受 jQuery selector 对象。

position 位置对象, 取:

{
    top: 10,
    bottom: 10
}

设置 top 或者 bottom, 指当元素距离当前可视窗口顶部或底部的距离等于这个值时, 开始触发跟随状态. 当 position 取一整型数值时, 等价于 position{ top: x }

callback 当元素更改状态之后的回调函数, 具有一个参数 status, 为 true 表示是 stick 状态, 为 false 为 unstick 状态.

有几下三点注意:

  1. position.top 设置的值超过元素本身在文档中的高度时, 就变为全局 fixed 效果

  2. Sticky 对某些情况下的元素会向 DOM 中插入占位元素, 所以务必在 DOM ready 之后初始化该组件

  3. 对于 position: static or relativedisplay 不为 none 的情况下, 会在当前元素后面插入宽高与元素相同的占位符.

返回为 Sticky 实例对象, 具有以下成员和方法:

  • this.elem 当前元素, 即上述的 element

  • this.adjust() 用于当 sticky 元素被动改变位置时, 导致其 offsetTop 改变, 从而需要手工调用该方法来调整 sticky 元素状态. 自动检测元素位置改变实现太复杂, 这里简略处理.

Sticky.fixed(element)

seajs.use(["sticky"], function(sticky) {

    sticky.fix("#element-need-to-fixed");

});

element 是指需要 fixed 的目标元素,接受 jQuery selector 对象。

注意: 请自行设置元素的 left, top 等 CSS 属性。