江西小程序管理端
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<template>
<!-- #ifdef APP-NVUE -->
<list
class="u-list"
:enableBackToTop="enableBackToTop"
:loadmoreoffset="lowerThreshold"
:showScrollbar="showScrollbar"
:style="[listStyle]"
:offset-accuracy="Number(offsetAccuracy)"
@scroll="onScroll"
@loadmore="scrolltolower"
>
<slot />
</list>
<!-- #endif -->
<!-- #ifndef APP-NVUE -->
<scroll-view
class="u-list"
:scroll-into-view="scrollIntoView"
:style="[listStyle]"
scroll-y
:scroll-top="Number(scrollTop)"
:lower-threshold="Number(lowerThreshold)"
:upper-threshold="Number(upperThreshold)"
:show-scrollbar="showScrollbar"
:enable-back-to-top="enableBackToTop"
:scroll-with-animation="scrollWithAnimation"
@scroll="onScroll"
@scrolltolower="scrolltolower"
@scrolltoupper="scrolltoupper"
>
<view>
<slot />
</view>
</scroll-view>
<!-- #endif -->
</template>
<script>
import props from './props.js';
// #ifdef APP-NVUE
const dom = uni.requireNativePlugin('dom')
// #endif
/**
* List 列表
* @description 该组件为高性能列表组件
* @tutorial https://www.uviewui.com/components/list.html
* @property {Boolean} showScrollbar 控制是否出现滚动条,仅nvue有效 (默认 false )
* @property {String | Number} lowerThreshold 距底部多少时触发scrolltolower事件 (默认 50 )
* @property {String | Number} upperThreshold 距顶部多少时触发scrolltoupper事件,非nvue有效 (默认 0 )
* @property {String | Number} scrollTop 设置竖向滚动条位置(默认 0 )
* @property {String | Number} offsetAccuracy 控制 onscroll 事件触发的频率,仅nvue有效(默认 10 )
* @property {Boolean} enableFlex 启用 flexbox 布局。开启后,当前节点声明了display: flex就会成为flex container,并作用于其孩子节点,仅微信小程序有效(默认 false )
* @property {Boolean} pagingEnabled 是否按分页模式显示List,(默认 false )
* @property {Boolean} scrollable 是否允许List滚动(默认 true )
* @property {String} scrollIntoView 值应为某子元素id(id不能以数字开头)
* @property {Boolean} scrollWithAnimation 在设置滚动条位置时使用动画过渡 (默认 false )
* @property {Boolean} enableBackToTop iOS点击顶部状态栏、安卓双击标题栏时,滚动条返回顶部,只对微信小程序有效 (默认 false )
* @property {String | Number} height 列表的高度 (默认 0 )
* @property {String | Number} width 列表宽度 (默认 0 )
* @property {String | Number} preLoadScreen 列表前后预渲染的屏数,1代表一个屏幕的高度,1.5代表1个半屏幕高度 (默认 1 )
* @property {Object} customStyle 定义需要用到的外部样式
*
* @example <u-list @scrolltolower="scrolltolower"></u-list>
*/
export default {
name: 'u-list',
mixins: [uni.$u.mpMixin, uni.$u.mixin,props],
watch: {
scrollIntoView(n) {
this.scrollIntoViewById(n)
}
},
data() {
return {
// 记录内部滚动的距离
innerScrollTop: 0,
// vue下,scroll-view在上拉加载时的偏移值
offset: 0,
sys: uni.$u.sys()
}
},
computed: {
listStyle() {
const style = {},
addUnit = uni.$u.addUnit
if (this.width != 0) style.width = addUnit(this.width)
if (this.height != 0) style.height = addUnit(this.height)
// 如果没有定义列表高度,则默认使用屏幕高度
if (!style.height) style.height = addUnit(this.sys.windowHeight, 'px')
return uni.$u.deepMerge(style, uni.$u.addStyle(this.customStyle))
}
},
provide() {
return {
uList: this
}
},
created() {
this.refs = []
this.children = []
this.anchors = []
},
mounted() {},
methods: {
updateOffsetFromChild(top) {
this.offset = top
},
onScroll(e) {
let scrollTop = 0
// #ifdef APP-NVUE
scrollTop = e.contentOffset.y
// #endif
// #ifndef APP-NVUE
scrollTop = e.detail.scrollTop
// #endif
this.innerScrollTop = scrollTop
this.$emit('scroll', Math.abs(scrollTop))
},
scrollIntoViewById(id) {
// #ifdef APP-NVUE
// 根据id参数,找到所有u-list-item中匹配的节点,再通过dom模块滚动到对应的位置
const item = this.refs.find(item => item.$refs[id] ? true : false)
dom.scrollToElement(item.$refs[id], {
// 是否需要滚动动画
animated: this.scrollWithAnimation
})
// #endif
},
// 滚动到底部触发事件
scrolltolower(e) {
uni.$u.sleep(30).then(() => {
this.$emit('scrolltolower')
})
},
// #ifndef APP-NVUE
// 滚动到底部时触发,非nvue有效
scrolltoupper(e) {
uni.$u.sleep(30).then(() => {
this.$emit('scrolltoupper')
// 这一句很重要,能绝对保证在性功能障碍的webview,滚动条到顶时,取消偏移值,让页面置顶
this.offset = 0
})
}
// #endif
},
}
</script>
<style lang="scss" scoped>
@import "../../libs/css/components.scss";
.u-list {
@include flex(column);
}
</style>