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uview-plus/components/u-picker/u-picker.vue
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389
uview-plus/components/u-picker/u-picker.vue
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<template>
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<view class="u-picker-warrper">
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<view v-if="hasInput" class="u-picker-input cursor-pointer" @click="onShowByClickInput">
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<slot>
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<up-input :disabled="disabled" :disabledColor="disabledColor" border="none" :inputAlign="inputAlign" :placeholder="placeholder" :placeholderClass="placeholderClass" :readonly="true" v-model="inputLabel"></up-input>
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<div class="input-cover"></div>
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</slot>
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</view>
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<u-popup :show="show || (hasInput && showByClickInput)" :mode="popupMode" :zIndex="zIndex" @close="closeHandler">
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<view class="u-picker">
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<u-toolbar
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v-if="showToolbar"
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:cancelColor="cancelColor"
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:confirmColor="confirmColor"
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:cancelText="cancelText"
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:confirmText="confirmText"
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:title="title"
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:rightSlot="toolbarRightSlot ? true : false"
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@cancel="cancel"
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@confirm="confirm"
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>
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<template #right>
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<slot name="toolbar-right"></slot>
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</template>
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</u-toolbar>
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<slot name="toolbar-bottom"></slot>
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<picker-view
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class="u-picker__view"
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:indicatorStyle="`height: ${addUnit(itemHeight)}`"
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:value="innerIndex"
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:immediateChange="immediateChange"
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:style="{
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height: `${addUnit(visibleItemCount * itemHeight)}`
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}"
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@change="changeHandler"
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>
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<picker-view-column v-for="(item, index) in innerColumns" :key="index" class="u-picker__view__column">
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<view
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v-if="testArray(item)"
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class="u-picker__view__column__item u-line-1"
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:class="[index1 === innerIndex[index] && 'u-picker__view__column__item--selected']"
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v-for="(item1, index1) in item"
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:key="index1"
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:style="{
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height: addUnit(itemHeight),
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lineHeight: addUnit(itemHeight),
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fontWeight: index1 === innerIndex[index] ? 'bold' : 'normal',
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display: 'block'
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}"
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>
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{{ getItemText(item1) }}
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</view>
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</picker-view-column>
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</picker-view>
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<view v-if="loading" class="u-picker--loading">
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<u-loading-icon mode="circle"></u-loading-icon>
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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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/**
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* u-picker
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* @description 选择器
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* @property {Boolean} show 是否显示picker弹窗(默认 false )
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* @property {Boolean} showToolbar 是否显示顶部的操作栏(默认 true )
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* @property {String} title 顶部标题
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* @property {Array} columns 对象数组,设置每一列的数据
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* @property {Boolean} loading 是否显示加载中状态(默认 false )
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* @property {String | Number} itemHeight 各列中,单个选项的高度(默认 44 )
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* @property {String} cancelText 取消按钮的文字(默认 '取消' )
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* @property {String} confirmText 确认按钮的文字(默认 '确定' )
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* @property {String} cancelColor 取消按钮的颜色(默认 '#909193' )
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* @property {String} confirmColor 确认按钮的颜色(默认 '#3c9cff' )
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* @property {String | Number} visibleItemCount 每列中可见选项的数量(默认 5 )
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* @property {String} keyName 选项对象中,需要展示的属性键名(默认 'text' )
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* @property {Boolean} closeOnClickOverlay 是否允许点击遮罩关闭选择器(默认 false )
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* @property {Array} defaultIndex 各列的默认索引
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* @property {Boolean} immediateChange 是否在手指松开时立即触发change事件(默认 true )
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* @event {Function} close 关闭选择器时触发
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* @event {Function} cancel 点击取消按钮触发
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* @event {Function} change 当选择值变化时触发
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* @event {Function} confirm 点击确定按钮,返回当前选择的值
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*/
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import { props } from './props';
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import { mpMixin } from '../../libs/mixin/mpMixin';
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import { mixin } from '../../libs/mixin/mixin';
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import { addUnit, deepClone, sleep } from '../../libs/function/index';
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import test from '../../libs/function/test';
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export default {
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name: 'u-picker',
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mixins: [mpMixin, mixin, props],
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data() {
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return {
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// 上一次选择的列索引
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lastIndex: [],
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// 索引值 ,对应picker-view的value
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innerIndex: [],
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// 各列的值
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innerColumns: [],
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// 上一次的变化列索引
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columnIndex: 0,
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showByClickInput: false,
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currentActiveValue: [] //当前用户选中,但是还没确认的值,用户没做change操作时候,点击确认可以默认选中第一个
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};
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},
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watch: {
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// 监听默认索引的变化,重新设置对应的值
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defaultIndex: {
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immediate: true,
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deep: true,
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handler(n, o) {
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// 修复uniapp调用子组件直接:defaultIndex="[0]"这样写
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// v-model的值变化时候导致defaultIndexwatch也会执行的问题
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//单纯vue不会出现
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if (!o || n.join('/') != o.join('/')) {
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this.setIndexs(n, true);
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}
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}
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},
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// 监听columns参数的变化
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columns: {
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immediate: true,
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deep: true,
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handler(n) {
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this.setColumns(n);
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}
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}
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},
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emits: ['close', 'cancel', 'confirm', 'change', 'update:modelValue', 'update:show'],
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computed: {
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//已选&&已确认的值显示在input上面的文案
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inputLabel() {
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let firstItem = this.innerColumns[0] && this.innerColumns[0][0];
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// //区分是不是对象数组
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if (firstItem && Object.prototype.toString.call(firstItem) === '[object Object]') {
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let res = this.innerColumns[0].filter((item) => this.modelValue.includes(item['id']));
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res = res.map((item) => item[this.keyName]);
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return res.join('/');
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} else {
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//用户确定的值,才显示到输入框
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return this.modelValue.join('/');
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}
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},
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//已选,待确认的值
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inputValue() {
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let items = this.innerColumns.map((item, index) => item[this.innerIndex[index]]);
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let res = [];
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//区分是不是对象数组
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if (items[0] && Object.prototype.toString.call(items[0]) === '[object Object]') {
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//对象数组返回id集合
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items.forEach((element) => {
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res.push(element && element['id']);
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});
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} else {
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//非对象数组返回元素集合
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items.forEach((element, index) => {
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res.push(element);
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});
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}
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return res;
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}
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},
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methods: {
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addUnit,
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testArray: test.array,
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onShowByClickInput() {
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if (!this.disabled) {
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this.showByClickInput = !this.showByClickInput;
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}
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},
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// 获取item需要显示的文字,判别为对象还是文本
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getItemText(item) {
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if (test.object(item)) {
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return item[this.keyName];
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} else {
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return item;
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}
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},
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// 关闭选择器
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closeHandler() {
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if (this.closeOnClickOverlay) {
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if (this.hasInput) {
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this.showByClickInput = false;
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}
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this.$emit('update:show', false);
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this.$emit('close');
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}
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},
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// 点击工具栏的取消按钮
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cancel() {
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if (this.hasInput) {
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this.showByClickInput = false;
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}
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this.$emit('update:show', false);
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this.$emit('cancel');
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},
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// 点击工具栏的确定按钮
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confirm() {
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//如果用户有没有触发过change
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if (!this.currentActiveValue.length) {
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let arr = [0];
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//如果有默认值&&默认值的数组长度是正确的,就用默认值
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if (Array.isArray(this.defaultIndex) && this.defaultIndex.length == this.innerColumns.length) {
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arr = [...this.defaultIndex];
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} else {
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//否则默认都选中第一个
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arr = Array(this.innerColumns.length).fill(0);
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}
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this.setLastIndex(arr);
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this.setIndexs(arr);
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}
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this.$emit('update:modelValue', this.inputValue);
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if (this.hasInput) {
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this.showByClickInput = false;
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}
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this.$emit('update:show', false);
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this.$emit('confirm', {
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indexs: this.innerIndex,
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value: this.innerColumns.map((item, index) => item[this.innerIndex[index]]),
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values: this.innerColumns
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});
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},
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// 选择器某一列的数据发生变化时触发
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changeHandler(e) {
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const { value } = e.detail;
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let index = 0,
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columnIndex = 0;
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//记录用户选中但是还没确认的值
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this.currentActiveValue = value;
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// 通过对比前后两次的列索引,得出当前变化的是哪一列
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for (let i = 0; i < value.length; i++) {
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let item = value[i];
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if (item !== (this.lastIndex[i] || 0)) {
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// 把undefined转为合法假值0
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// 设置columnIndex为当前变化列的索引
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columnIndex = i;
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// index则为变化列中的变化项的索引
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index = item;
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break; // 终止循环,即使少一次循环,也是性能的提升
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}
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}
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this.columnIndex = columnIndex;
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const values = this.innerColumns;
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// 将当前的各项变化索引,设置为"上一次"的索引变化值
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this.setLastIndex(value);
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this.setIndexs(value);
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//如果是非自带输入框才会在change时候触发v-model绑值的变化
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//否则会非常的奇怪,用户未确认,值就变了
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if (!this.hasInput) {
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this.$emit('update:modelValue', this.inputValue);
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}
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this.$emit('change', {
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// #ifndef MP-WEIXIN || MP-LARK
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// 微信小程序不能传递this,会因为循环引用而报错
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// picker: this,
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// #endif
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value: this.innerColumns.map((item, index) => item[value[index]]),
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index,
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indexs: value,
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// values为当前变化列的数组内容
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values,
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columnIndex
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});
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},
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// 设置index索引,此方法可被外部调用设置
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setIndexs(index, setLastIndex) {
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this.innerIndex = deepClone(index);
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if (setLastIndex) {
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this.setLastIndex(index);
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}
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},
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// 记录上一次的各列索引位置
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setLastIndex(index) {
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// 当能进入此方法,意味着当前设置的各列默认索引,即为“上一次”的选中值,需要记录,是因为changeHandler中
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// 需要拿前后的变化值进行对比,得出当前发生改变的是哪一列
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this.lastIndex = deepClone(index);
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},
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// 设置对应列选项的所有值
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setColumnValues(columnIndex, values) {
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// 替换innerColumns数组中columnIndex索引的值为values,使用的是数组的splice方法
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this.innerColumns.splice(columnIndex, 1, values);
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// 替换完成之后将修改列之后的已选值置空
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this.setLastIndex(this.innerIndex.slice(0, columnIndex));
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// 拷贝一份原有的innerIndex做临时变量,将大于当前变化列的所有的列的默认索引设置为0
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let tmpIndex = deepClone(this.innerIndex);
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for (let i = 0; i < this.innerColumns.length; i++) {
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if (i > this.columnIndex) {
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tmpIndex[i] = 0;
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}
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}
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// 一次性赋值,不能单个修改,否则无效
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this.setIndexs(tmpIndex);
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},
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// 获取对应列的所有选项
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getColumnValues(columnIndex) {
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// 进行同步阻塞,因为外部得到change事件之后,可能需要执行setColumnValues更新列的值
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// 索引如果在外部change的回调中调用getColumnValues的话,可能无法得到变更后的列值,这里进行一定延时,保证值的准确性
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(async () => {
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await sleep();
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})();
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return this.innerColumns[columnIndex];
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},
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// 设置整体各列的columns的值
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setColumns(columns) {
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// console.log(columns)
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this.innerColumns = deepClone(columns);
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// 如果在设置各列数据时,没有被设置默认的各列索引defaultIndex,那么用0去填充它,数组长度为列的数量
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if (this.innerIndex.length === 0) {
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this.innerIndex = new Array(columns.length).fill(0);
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}
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},
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// 获取各列选中值对应的索引
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getIndexs() {
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return this.innerIndex;
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},
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// 获取各列选中的值
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getValues() {
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// 进行同步阻塞,因为外部得到change事件之后,可能需要执行setColumnValues更新列的值
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// 索引如果在外部change的回调中调用getValues的话,可能无法得到变更后的列值,这里进行一定延时,保证值的准确性
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(async () => {
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await sleep();
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})();
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return this.innerColumns.map((item, index) => item[this.innerIndex[index]]);
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}
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}
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};
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</script>
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<style lang="scss" scoped>
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@import '../../libs/css/components.scss';
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.u-picker {
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position: relative;
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&-input {
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position: relative;
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.input-cover {
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opacity: 0;
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position: absolute;
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top: 0;
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bottom: 0;
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left: 0;
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right: 0;
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z-index: 1;
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}
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}
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&__view {
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&__column {
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@include flex;
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flex: 1;
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justify-content: center;
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&__item {
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@include flex;
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justify-content: center;
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align-items: center;
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font-size: 16px;
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text-align: center;
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/* #ifndef APP-NVUE */
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display: block;
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/* #endif */
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color: $u-main-color;
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&--disabled {
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/* #ifndef APP-NVUE */
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cursor: not-allowed;
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/* #endif */
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opacity: 0.35;
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}
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}
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}
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}
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&--loading {
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position: absolute;
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top: 0;
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right: 0;
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left: 0;
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bottom: 0;
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@include flex;
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justify-content: center;
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align-items: center;
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background-color: rgba(255, 255, 255, 0.87);
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z-index: 1000;
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}
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}
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</style>
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