tui-sticky.vue
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<template>
<view class="tui-sticky-class" :id="tui_Id">
<!--sticky 容器-->
<view :style="{height: stickyHeight,background:backgroundColor}" v-if="isFixed"></view>
<view :class="{'tui-sticky-fixed':isFixed}" :style="{top:isFixed?stickyTop+'px':'auto'}">
<slot name="header"></slot>
</view>
<!--sticky 容器-->
<!--内容-->
<slot name="content"></slot>
</view>
</template>
<script>
export default {
name: "tuiSticky",
emits: ['sticky', 'change'],
props: {
scrollTop: {
type: Number
},
//吸顶时与顶部的距离，单位px
stickyTop: {
type: [Number, String]
// #ifndef H5
,
default: 0
// #endif
// #ifdef H5
,
default: 44
// #endif
},
//是否指定容器，即内容放置插槽content内
container: {
type: Boolean,
default: false
},
//是否是原生自带header
isNativeHeader: {
type: Boolean,
default: true
},
//吸顶容器 高度 rpx
stickyHeight: {
type: String,
default: "auto"
},
//占位容器背景颜色
backgroundColor: {
type: String,
default: "transparent"
},
//是否重新计算[有异步加载时使用,设置大于0的数]
recalc: {
type: Number,
default: 0
},
//列表中的索引值
index: {
type: [Number, String],
default: 0
}
},
watch: {
scrollTop(newValue, oldValue) {
if (this.initialize != 0) {
this.updateScrollChange(() => {
this.updateStickyChange();
this.initialize = 0
});
} else {
this.updateStickyChange();
}
},
recalc(newValue, oldValue) {
this.updateScrollChange(() => {
this.updateStickyChange();
this.initialize = 0;
});
}
},
created() {
this.initialize = this.recalc
},
mounted() {
this.$nextTick(() => {
setTimeout(() => {
this.updateScrollChange();
}, 50)
})
},
data() {
const Id = `tui_${Math.ceil(Math.random() * 10e5).toString(36)}`
return {
timer: null,
top: 0,
height: 0,
isFixed: false,
initialize: 0, //重新初始化
tui_Id: Id
};
},
methods: {
updateStickyChange() {
const top = this.top;
const height = this.height;
const scrollTop = this.scrollTop
let stickyTop = this.stickyTop
// #ifdef H5
if (this.isNativeHeader) {
stickyTop = stickyTop - 44
stickyTop = stickyTop < 0 ? 0 : stickyTop
}
// #endif
if (this.container) {
this.isFixed = (scrollTop + stickyTop >= top && scrollTop + stickyTop < top + height) ? true : false
} else {
this.isFixed = scrollTop + stickyTop >= top ? true : false
}
//是否吸顶
this.$emit("sticky", {
isFixed: this.isFixed,
index: this.index
})
},
updateScrollChange(callback) {
if (this.timer) {
clearTimeout(this.timer)
this.timer = null
}
this.timer = setTimeout(() => {
const selectId = `#${this.tui_Id}`;
uni.createSelectorQuery()
// #ifndef MP-ALIPAY
.in(this)
// #endif
.select(selectId)
.fields({
size: true,
rect: true
}, res => {
if (res) {
this.top = res.top + (this.scrollTop || 0);
this.height = res.height;
callback && callback();
this.$emit("change", {
index: Number(this.index),
top: this.top
})
}
}).exec()
}, 0)
}
}
}
</script>
<style scoped>
.tui-sticky-fixed {
width: 100%;
position: fixed;
left: 0;
z-index: 888;
}
</style>