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132 lines
4.2 KiB
132 lines
4.2 KiB
<template> |
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<view class="u-dropdown-item" v-if="active" @touchmove.stop.prevent="() => {}" @tap.stop.prevent="() => {}"> |
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<block v-if="!$slots.default && !$slots.$default"> |
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<scroll-view scroll-y="true" :style="{ |
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height: $u.addUnit(height) |
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}"> |
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<view class="u-dropdown-item__options"> |
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<u-cell-group> |
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<u-cell-item @click="cellClick(item.value)" :arrow="false" :title="item.label" v-for="(item, index) in options" |
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:key="index" :title-style="{ |
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color: value == item.value ? activeColor : inactiveColor |
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}"> |
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<u-icon v-if="value == item.value" name="checkbox-mark" :color="activeColor" size="32"></u-icon> |
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</u-cell-item> |
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</u-cell-group> |
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</view> |
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</scroll-view> |
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</block> |
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<slot v-else /> |
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</view> |
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</template> |
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<script> |
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/** |
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* dropdown-item 下拉菜单 |
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* @description 该组件一般用于向下展开菜单,同时可切换多个选项卡的场景 |
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* @tutorial http://uviewui.com/components/dropdown.html |
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* @property {String | Number} v-model 双向绑定选项卡选择值 |
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* @property {String} title 菜单项标题 |
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* @property {Array[Object]} options 选项数据,如果传入了默认slot,此参数无效 |
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* @property {Boolean} disabled 是否禁用此选项卡(默认false) |
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* @property {String | Number} duration 选项卡展开和收起的过渡时间,单位ms(默认300) |
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* @property {String | Number} height 弹窗下拉内容的高度(内容超出将会滚动)(默认auto) |
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* @example <u-dropdown-item title="标题"></u-dropdown-item> |
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*/ |
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export default { |
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name: 'u-dropdown-item', |
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props: { |
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// 当前选中项的value值 |
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value: { |
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type: [Number, String, Array], |
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default: '' |
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}, |
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// 菜单项标题 |
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title: { |
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type: [String, Number], |
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default: '' |
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}, |
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// 选项数据,如果传入了默认slot,此参数无效 |
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options: { |
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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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// 是否禁用此菜单项 |
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disabled: { |
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type: Boolean, |
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default: false |
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}, |
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// 下拉弹窗的高度 |
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height: { |
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type: [Number, String], |
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default: 'auto' |
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}, |
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}, |
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data() { |
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return { |
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active: false, // 当前项是否处于展开状态 |
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activeColor: '#2979ff', // 激活时左边文字和右边对勾图标的颜色 |
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inactiveColor: '#606266', // 未激活时左边文字和右边对勾图标的颜色 |
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} |
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}, |
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computed: { |
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// 监听props是否发生了变化,有些值需要传递给父组件u-dropdown,无法双向绑定 |
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propsChange() { |
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return `${this.title}-${this.disabled}`; |
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} |
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}, |
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watch: { |
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propsChange(n) { |
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// 当值变化时,通知父组件重新初始化,让父组件执行每个子组件的init()方法 |
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// 将所有子组件数据重新整理一遍 |
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if (this.parent) this.parent.init(); |
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} |
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}, |
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created() { |
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// 父组件的实例 |
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this.parent = false; |
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}, |
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methods: { |
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init() { |
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// 获取父组件u-dropdown |
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let parent = this.$u.$parent.call(this, 'u-dropdown'); |
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if (parent) { |
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this.parent = parent; |
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// 将子组件的激活颜色配置为父组件设置的激活和未激活时的颜色 |
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this.activeColor = parent.activeColor; |
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this.inactiveColor = parent.inactiveColor; |
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// 将本组件的this,放入到父组件的children数组中,让父组件可以操作本(子)组件的方法和属性 |
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// push进去前,显判断是否已经存在了本实例,因为在子组件内部数据变化时,会通过父组件重新初始化子组件 |
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let exist = parent.children.find(val => { |
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return this === val; |
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}) |
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if (!exist) parent.children.push(this); |
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if (parent.children.length == 1) this.active = true; |
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// 父组件无法监听children的变化,故将子组件的title,传入父组件的menuList数组中 |
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parent.menuList.push({ |
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title: this.title, |
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disabled: this.disabled |
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}); |
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} |
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}, |
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// cell被点击 |
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cellClick(value) { |
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// 修改通过v-model绑定的值 |
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this.$emit('input', value); |
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// 通知父组件(u-dropdown)收起菜单 |
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this.parent.close(); |
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// 发出事件,抛出当前勾选项的value |
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this.$emit('change', value); |
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} |
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}, |
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mounted() { |
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this.init(); |
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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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@import "../../libs/css/style.components.scss"; |
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</style>
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