scroll-view

---

可滚动视图区域。使用竖向滚动时，需要给scroll-view一个固定高度，通过 WXSS 设置 height。组件属性的长度单位默认为px。

效果展示

示例代码

WXML

<view class="page">
    <view class="page__bd">
        <view class="section">
            <view class="section__title">vertical scroll</view>
            <button bindtap="reset"></button>
            <scroll-view scroll-y="{{true}}" style="height: 200px;" bindscrolltoupper="upper" bindscrolltolower="lower" bindscroll="scroller" scroll-into-view="{{toView}}" scroll-top="{{scrollTop}}">
                <view id="green" class="scroll-view-item bc_green"></view>
                <view id="red" class="scroll-view-item bc_red"></view>
                <view id="yellow" class="scroll-view-item bc_yellow"></view>
                <view id="blue" class="scroll-view-item bc_blue"></view>
            </scroll-view>
            <view class="btn-area">
                <button size="mini" bindtap="tap">click me to scroll into view</button>
                <button size="mini" bindtap="tapMove">click me to scroll</button>
                <button size="mini" bindtap="scrollToTop">click me to top：{{scrollTop}}</button>
            </view>
        </view>

        <view class="section section_gap">
            <view class="section__title">horizontal scroll</view>
            <scroll-view class="scroll-view_H" scroll-x="{{true}}" style="width: 100%" scroll-left="{{scrollLeft}}">
                <view id="green" class="scroll-view-item_H bc_green"></view>
                <view id="red" class="scroll-view-item_H bc_red"></view>
                <view id="yellow" class="scroll-view-item_H bc_yellow"></view>
                <view id="blue" class="scroll-view-item_H bc_blue"></view>
            </scroll-view>
            <view class="btn-area">
                <button size="mini" bindtap="tap2">click me to scroll into view</button>
                <button size="mini" bindtap="tapMove2">click me to scroll</button>
                <button size="mini" bindtap="scrollToLeft">click me to left：{{scrollLeft}}</button>
            </view>
        </view>
    </view>
</view>

JS

var order = ['green', 'red', 'yellow', 'blue', 'green']
Page({
  data: {
    toView: "green",
    s: 20,
    scrollLeft: 100,
    scrollTop: 0
  },
  tap1: function () {
    var i = this.data.s += 20
  },
  upper: function (e) {
    console.log(e);
  },
  lower: function (e) {
    console.log(e);
  },
  scroller: function (e) {
    console.log(e);
  },
  scrollToTop: function (e) {
    this.setData({
      scrollTop: 0
    })
  },
  scrollToLeft: function (e) {
    this.setData({
      scrollLeft: 0
    })
  },
  tap: function (e) {
    for (var i = 0; i < order.length; ++i) {
      if (order[i] === this.data.toView) {
        this.setData({
          toView: order[i + 1],
          scrollTop: (i + 1) * 200
        })
        break
      }
    }
  },
  tap2: function (e) {
    for (var i = 0; i < order.length; ++i) {
      if (order[i] === this.data.toView) {
        this.setData({
          toView: order[i + 1],
          scrollLeft: (i + 1) * 200
        })
        break
      }
    }
  },
  tapMove: function (e) {
    this.setData({
      scrollTop: this.data.scrollTop + 10
    })
  },
  tapMove2: function (e) {
    this.setData({
      scrollLeft: this.data.scrollLeft + 10
    })
  }
})

WXSS

.scroll-view_H{
    white-space: nowrap;
}
.scroll-view-item{
    height: 200px;
}
.scroll-view-item_H{
    display: inline-block;
    width: 100%;
    height: 200px;
}
.bc_green{ background: green;}
.bc_red{ background: red;}
.bc_yellow{ background: yellow;}
.bc_blue{ background: blue;}
.mini {
    font-size: 12px;
    margin-top: 10px;
}

API

属性	类型	默认值	必填	说明
scroll-x	boolean	false	否	允许横向滚动
scroll-y	boolean	false	否	允许纵向滚动
scroll-top	number/string		否	设置竖向滚动条位置
scroll-left	number/string		否	设置横向滚动条位置
scroll-into-view	string		否	值应为某子元素id（id不能以数字开头）。滚动到该元素
bindscrolltoupper	eventhandle		否	滚动到顶部/左边时触发
bindscrolltolower	eventhandle		否	滚动到底部时触发
bindscroll	eventhandle		否	滚动时触发，event.detail = {scrollLeft, scrollTop, scrollHeight, scrollWidth, deltaX, deltaY}

• 初始化时，scroll-top/scroll-left/scroll-into-view 无效，事件不触发。
• scroll-into-view 和 scroll-top/scroll-left 同时变化时，以后者为准。