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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="valueCom === 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 https://vkuviewdoc.fsq.pub/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",
- emits: ["update:modelValue", "input", "change"],
- props: {
- // 当前选中项的value值
- value: {
- type: [Number, String, Array],
- default: ""
- },
- modelValue: {
- 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: {
- valueCom() {
- // #ifdef VUE2
- return this.value;
- // #endif
- // #ifdef VUE3
- return this.modelValue;
- // #endif
- },
- // 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);
- this.$emit("update:modelValue", value);
- // 通知父组件(u-dropdown)收起菜单
- this.parent.close();
- // 发出事件,抛出当前勾选项的value
- this.$emit("change", value);
- }
- },
- mounted() {
- this.init();
- }
- };
- </script>
- <style scoped lang="scss">
- @import "../../libs/css/style.components.scss";
- </style>
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