320 lines
9.1 KiB
Vue
320 lines
9.1 KiB
Vue
<template>
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<view class="u-select">
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<!-- <view class="u-select__action" :class="{
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'u-select--border': border
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}" @tap.stop="selectHandler">
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<view class="u-select__action__icon" :class="{
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'u-select__action__icon--reverse': value == true
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}">
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<u-icon name="arrow-down-fill" size="26" color="#c0c4cc"></u-icon>
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</view>
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</view> -->
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<u-popup :maskCloseAble="maskCloseAble" mode="bottom" :popup="false" v-model="value" length="auto" :safeAreaInsetBottom="safeAreaInsetBottom" @close="close" :z-index="uZIndex">
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<view class="u-select">
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<view class="u-select__header" @touchmove.stop.prevent="stop" catchtouchmove="stop">
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<view
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class="u-select__header__cancel u-select__header__btn"
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:style="{ color: cancelColor }"
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hover-class="u-hover-class"
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:hover-stay-time="150"
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@tap="getResult('cancel')"
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>
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取消
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</view>
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<view
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class="u-select__header__confirm u-select__header__btn"
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:style="{ color: confirmColor }"
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hover-class="u-hover-class"
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:hover-stay-time="150"
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@touchmove.stop=""
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@tap.stop="getResult('confirm')"
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>
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确定
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</view>
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</view>
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<view class="u-select__body">
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<picker-view @change="columnChange" class="u-select__body__picker-view" :value="defaultSelector">
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<picker-view-column v-for="(item, index) in columnData" :key="index">
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<view class="u-select__body__picker-view__item" v-for="(item1, index1) in item" :key="index1">
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<view class="u-line-1">{{ item1.label }}</view>
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</view>
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</picker-view-column>
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</picker-view>
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</view>
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</view>
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</u-popup>
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</view>
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</template>
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<script>
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export default {
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props: {
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// 列数据
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list: {
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type: Array,
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default() {
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return [];
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}
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},
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// 是否显示边框
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border: {
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type: Boolean,
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default: true
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},
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// 通过双向绑定控制组件的弹出与收起
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value: {
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type: Boolean,
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default: false
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},
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// "取消"按钮的颜色
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cancelColor: {
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type: String,
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default: '#606266'
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},
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// "确定"按钮的颜色
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confirmColor: {
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type: String,
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default: '#2979ff'
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},
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// 弹出的z-index值
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zIndex: {
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type: [String, Number],
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default: 0
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},
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safeAreaInsetBottom: {
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type: Boolean,
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default: false
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},
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// 是否允许通过点击遮罩关闭Picker
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maskCloseAble: {
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type: Boolean,
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default: true
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},
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// 提供的默认选中的下标
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defaultValue: {
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type: Array,
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default() {
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return [0];
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}
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},
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// 模式选择，single-column-单列，mutil-column-多列，mutil-column-auto-多列联动
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mode: {
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type: String,
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default: 'single-column'
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}
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},
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data() {
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return {
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// 用于列改变时，保存当前的索引，下一次变化时比较得出是哪一列发生了变化
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defaultSelector: [0],
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// picker-view的数据
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columnData: [],
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// 每次队列发生变化时，保存选择的结果
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selectValue: [],
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// 上一次列变化时的index
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lastSelectIndex: [],
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// 列数
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columnNum: 0,
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};
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},
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watch: {
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// 在select弹起的时候，重新初始化所有数据
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value: {
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immediate: true,
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handler(val) {
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if(val) setTimeout(() => this.init(), 10);
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}
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},
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},
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computed: {
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uZIndex() {
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// 如果用户有传递z-index值，优先使用
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return this.zIndex ? this.zIndex : this.$u.zIndex.popup;
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},
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},
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methods: {
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init() {
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this.setColumnNum();
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this.setDefaultSelector();
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this.setColumnData();
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this.setSelectValue();
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},
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// 获取默认选中列下标
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setDefaultSelector() {
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// 如果没有传入默认选中的值，生成长度为columnNum，用0填充的数组
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this.defaultSelector = this.defaultValue.length == this.columnNum ? this.defaultValue : Array(this.columnNum).fill(0);
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this.lastSelectIndex = this.$u.deepClone(this.defaultSelector);
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},
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// 计算列数
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setColumnNum() {
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// 单列的列数为1
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if(this.mode == 'single-column') this.columnNum = 1;
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// 多列时，this.list数组长度就是列数
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else if(this.mode == 'mutil-column') this.columnNum = this.list.length;
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// 多列联动时，通过历遍this.list的第一个元素，得出有多少列
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else if(this.mode == 'mutil-column-auto') {
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let num = 1;
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let column = this.list;
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// 只要有元素并且第一个元素有children属性，继续历遍
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while(column[0].children) {
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column = column[0] ? column[0].children : {};
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num ++;
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}
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this.columnNum = num;
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}
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},
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// 获取需要展示在picker中的列数据
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setColumnData() {
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let data = [];
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this.selectValue = [];
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if(this.mode == 'mutil-column-auto') {
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// 获得所有数据中的第一个元素
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let column = this.list[this.defaultSelector.length ? this.defaultSelector[0] : 0];
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// 通过循环所有的列数，再根据设定列的数组，得出当前需要渲染的整个列数组
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for (let i = 0; i < this.columnNum; i++) {
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// 第一列默认为整个list数组
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if (i == 0) {
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data[i] = this.list;
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column = column.children;
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} else {
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// 大于第一列时，判断是否有默认选中的，如果没有就用该列的第一项
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data[i] = column;
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column = column[this.defaultSelector[i]].children;
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}
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}
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} else if(this.mode == 'single-column') {
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data[0] = this.list;
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} else {
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data = this.list;
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}
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this.columnData = data;
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},
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// 获取默认选中的值，如果没有设置defaultValue，就默认选中每列的第一个
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setSelectValue() {
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for(let i = 0; i < this.columnNum; i++) {
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this.selectValue.push({
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value: this.columnData[i][this.defaultSelector[i]].value,
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label: this.columnData[i][this.defaultSelector[i]].label,
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})
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}
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},
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// 列选项
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columnChange(e) {
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let index = null;
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let cloumnIndex = e.detail.value;
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// 由于后面是需要push进数组的，所以需要先清空数组
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this.selectValue = [];
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if(this.mode == 'mutil-column-auto') {
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// 对比前后两个数组，寻找变更的是哪一列，如果某一个元素不同，即可判定该列发生了变化
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this.lastSelectIndex.map((val, idx) => {
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if (val != cloumnIndex[idx]) index = idx;
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});
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this.defaultSelector = cloumnIndex;
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for (let i = index + 1; i < this.columnNum; i++) {
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// 当前变化列的下一列的数据，需要获取上一列的数据，同时需要指定是上一列的第几个的children，再往后的
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// 默认是队列的第一个为默认选项
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this.columnData[i] = this.columnData[i - 1][i - 1 == index ? cloumnIndex[index] : 0].children;
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// 改变的列之后的所有列，默认选中第一个
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this.defaultSelector[i] = 0;
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}
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// 在历遍的过程中，可能由于上一步修改this.columnData，导致产生连锁反应，程序触发columnChange，会有多次调用
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// 只有在最后一次数据稳定后的结果是正确的，此前的历遍中，可能会产生undefined，故需要判断
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cloumnIndex.map((item, index) => {
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let data = this.columnData[index][cloumnIndex[index]];
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this.selectValue.push({
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value: data ? data.value : null,
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label: data ? data.label : null
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})
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})
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// 保存这一次的结果，用于下次列发生变化时作比较
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this.lastSelectIndex = cloumnIndex;
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} else if(this.mode == 'single-column') {
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// 初始默认选中值
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this.selectValue.push({
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value: this.columnData[0][cloumnIndex[0]].value,
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label: this.columnData[0][cloumnIndex[0]].label,
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})
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} else if(this.mode == 'mutil-column') {
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// 初始默认选中值
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cloumnIndex.map((item, index) => {
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let data = this.columnData[index][cloumnIndex[index]];
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this.selectValue.push({
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value: data ? data.value : null,
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label: data ? data.label : null
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})
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})
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}
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},
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close() {
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this.$emit('input', false);
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},
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// 点击确定或者取消
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getResult(event = null) {
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if (event) this.$emit(event, this.selectValue);
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this.close();
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},
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selectHandler() {
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this.$emit('click');
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}
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}
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};
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</script>
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<style scoped lang="scss">
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.u-select {
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&__action {
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position: relative;
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line-height: $u-form-item-height;
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height: $u-form-item-height;
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&__icon {
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position: absolute;
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right: 20rpx;
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top: 50%;
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transition: transform .4s;
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transform: translateY(-50%);
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z-index: 1;
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&--reverse {
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transform: rotate(-180deg) translateY(50%);
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}
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}
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}
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&--border {
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border-radius: 6rpx;
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border-radius: 4px;
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border: 1px solid $u-form-item-border-color;
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}
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&__header {
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display: flex;
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align-items: center;
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justify-content: space-between;
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height: 80rpx;
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padding: 0 40rpx;
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}
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&__body {
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width: 100%;
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height: 500rpx;
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overflow: hidden;
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background-color: #fff;
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&__picker-view {
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height: 100%;
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box-sizing: border-box;
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&__item {
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display: flex;
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align-items: center;
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justify-content: center;
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font-size: 32rpx;
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color: $u-main-color;
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padding: 0 8rpx;
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}
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}
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}
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}
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</style>
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