✨(component): ✨(component): cascader 增加 allow-clear 用于清空

package/component/src/component/cascader/index.vue

@@ -1,48 +1,24 @@
 <template>
-  <lay-dropdown
-    class="layui-cascader"
-    ref="dropdownRef"
-    :autoFitMinWidth="false"
-    :updateAtScroll="true"
-  >
-    <lay-input
-      v-model="displayValue"
-      readonly
-      suffix-icon="layui-icon-down"
-      :placeholder="placeholder"
-      v-if="!slots.default"
-    ></lay-input>
+  <lay-dropdown class="layui-cascader" ref="dropdownRef" :autoFitMinWidth="false" :updateAtScroll="true"
+    :disabled="dropDownDisabled">
+    <lay-input v-model="displayValue" readonly suffix-icon="layui-icon-down" :placeholder="placeholder"
+      v-if="!slots.default" :allow-clear="allowClear" @clear="onClear"></lay-input>
     <slot v-else></slot>
 
     <template #content>
       <div class="layui-cascader-panel">
         <template v-for="(itemCol, index) in treeData">
-          <lay-scroll
-            height="180px"
-            class="layui-cascader-menu"
-            :key="'cascader-menu' + index"
-            v-if="itemCol.data.length"
-          >
-            <div
-              class="layui-cascader-menu-item"
-              v-for="(item, i) in itemCol.data"
-              :key="index + i"
-              @click="selectBar(item, i, index)"
-              :class="[
+          <lay-scroll height="180px" class="layui-cascader-menu" :key="'cascader-menu' + index"
+            v-if="itemCol.data.length">
+            <div class="layui-cascader-menu-item" v-for="(item, i) in itemCol.data" :key="index + i"
+              @click="selectBar(item, i, index)" :class="[
                 {
                   'layui-cascader-selected': itemCol.selectIndex === i,
                 },
-              ]"
-            >
-              <slot
-                :name="item.slot"
-                v-if="item.slot && slots[item.slot]"
-              ></slot>
+              ]">
+              <slot :name="item.slot" v-if="item.slot && slots[item.slot]"></slot>
               <template v-else>{{ item.label }}</template>
-              <i
-                class="layui-icon layui-icon-right"
-                v-if="item.children && item.children.length"
-              ></i>
+              <i class="layui-icon layui-icon-right" v-if="item.children && item.children.length"></i>
             </div>
           </lay-scroll>
         </template>
@@ -70,6 +46,7 @@ export interface LayCascaderProps {
   placeholder?: string;
   onlyLastLevel?: boolean;
   replaceFields?: { label: string; value: string; children: string };
+  allowClear?: boolean
 }
 const props = withDefaults(defineProps<LayCascaderProps>(), {
   options: null,
@@ -77,6 +54,7 @@ const props = withDefaults(defineProps<LayCascaderProps>(), {
   decollator: "/",
   placeholder: "",
   onlyLastLevel: false,
+  allowClear: false,
   replaceFields: () => {
     return {
       label: "label",
@@ -247,5 +225,24 @@ const selectBar = (item: any, selectIndex: number, parentIndex: number) => {
 
 const displayValue = ref<string | number | null>(null);
 const slots = useSlots();
-const dropdownRef = ref(null);
+const dropdownRef = ref();
+const dropDownDisabled = ref(false);
+
+//清除事件
+const onClear = () => {
+  dropDownDisabled.value=true;
+  let arr = JSON.parse(JSON.stringify(treeData.value));
+  for (let index = 0; index < arr.length; index++) {
+    arr[index].selectIndex = null;
+    if (index === 0) {
+      continue;
+    }
+    arr[index].data = [];
+  }
+  treeData.value = arr;
+  emit("update:modelValue", null);
+  setTimeout(() => {
+    dropDownDisabled.value=false;
+  }, 0);
+}
 </script>