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Vue

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