完成下拉列表的实现

admin-fe/src/components/select/Option.vue

@@ -1,15 +1,28 @@
 <template>
-  <li><slot></slot></li>
+  <li :ref="element" @click="onClick($event)">
+    <slot></slot>
+  </li>
 </template>
 
 <script lang="ts">
-import {defineComponent} from "vue";
+import {defineComponent, onMounted, onUpdated, ref} from "vue";
 
 export default defineComponent({
   name: "POption",
-  props:{
-    value:{
-      type: [String,Number,Object],
+  props: {
+    value: {
+      type: [String, Number, Object],
+    }
+  },
+  emits: ['select'],
+  setup(props,context) {
+    function onClick(e) {
+      e.target.data = props.value
+    }
+    const element = ref<HTMLElement>()
+
+    return {
+      element,onClick
     }
   }
 })

admin-fe/src/components/select/Select.vue

@@ -1,13 +1,14 @@
 <template>
   <div class="select-wrapper" :class="{active:isActive}" v-click-outside="onClose">
     <div class="select-box-wrapper" @click="isActive = !isActive">
-      <div class="select-value">{{ selectValue }}<span class="placeholder">{{ placeholder }}</span></div>
+      <div class="select-value">{{ selectValue }}<span v-if="!selectValue" class="placeholder">{{ placeholder }}</span>
+      </div>
       <div class="icon-arrow">
         <ArrowDown class="icon-select-arrow"/>
       </div>
     </div>
     <div class="select-options-wrapper">
-      <ul>
+      <ul @click="onSelect">
         <slot></slot>
       </ul>
     </div>
@@ -16,7 +17,7 @@
 
 <script lang="ts">
 import ArrowDown from "../icon/ArrowDown.vue";
-import {ref} from "vue";
+import {defineComponent, nextTick, ref, SetupContext} from "vue";
 import {CHANGE_EVENT, UPDATE_MODEL_EVENT} from "../../service/constants";
 
 export interface OptionItemType {
@@ -26,7 +27,7 @@ export interface OptionItemType {
 
 // declare var OptionItemArray: OptionItemType[];
 
-export default {
+export default defineComponent({
   name: "PSelect",
   components: {ArrowDown},
   props: {
@@ -34,6 +35,9 @@ export default {
       type: String,
       default: '请选择'
     },
+    modelValue: {
+      type: [String, Number, Object]
+    }
   },
   emits: [
     UPDATE_MODEL_EVENT,
@@ -41,17 +45,35 @@ export default {
     'focus',
     'blur',
   ],
-  setup(props) {
+  setup(props, ctx: SetupContext) {
     const selectValue = ref(props.modelValue)
     const isActive = ref(false)
-    function onClose(){
+
+    function onSelect(e: MouseEvent) {
+      // 原生dom操作
+      const target = e.target as HTMLElement;
+      if (target.tagName.toLowerCase() != 'li') return;
+      e.preventDefault();
+      e.stopPropagation();
+      //
+      const text = target.textContent
+      selectValue.value = text
+      const arr = [].slice.call (target.parentElement.children)
+      arr.forEach(ele => (ele as HTMLElement).classList.remove("selected"))
+      target.classList.add("selected")
+      ctx.emit(UPDATE_MODEL_EVENT,target.data)
+      onClose()
+    }
+
+    function onClose() {
       isActive.value = false
     }
+
     return {
-      selectValue, isActive,onClose
+      selectValue, isActive, onClose, onSelect
     }
   }
-}
+})
 </script>
 
 <style lang="less">
@@ -62,7 +84,8 @@ export default {
     .select-options-wrapper {
       display: block;
     }
-    .select-box-wrapper{
+
+    .select-box-wrapper {
       border-color: var(--primary-color);
       box-shadow: 0 0 3px var(--primary-color);
     }

admin-fe/src/views/Test.vue

@@ -20,17 +20,16 @@
     </div>
     <hr>
     商品类型
-    <p-select>
-      <p-option value="1">普通商品</p-option>
-      <p-option class="selected" value="2">精选商品</p-option>
-      <p-option value="3">秒杀商品</p-option>
+    <p-select v-model="select">
+      <p-option v-for="op in options" :key="op.value" :value="op">{{ op.label }}</p-option>
     </p-select>
+    {{ JSON.stringify(select) }}
   </div>
 </template>
 
 <script lang="ts" setup>
 import PInput from "../components/input";
-import {reactive} from "vue";
+import {reactive, ref} from "vue";
 import PSelect from "../components/select/Select.vue";
 import POption from "../components/select/Option.vue";
 
@@ -38,6 +37,12 @@ const data = reactive({
   a: '1',
   b: '2'
 })
+const options = [
+  {value: 1, label: '普通商品'},
+  {value: 2, label: '精选商品'},
+  {value: 3, label: '秒杀商品'},
+]
+const select = ref()
 </script>
 
 <style scoped>