Merge pull request #946 from dcloudio/uni-combox-clearable

feat：uni-comobox新增clearAble属性

uni_modules/uni-combox/components/uni-combox/uni-combox.vue

@@ -4,10 +4,11 @@
 			<text>{{label}}</text>
 		</view>
 		<view class="uni-combox__input-box">
-			<input class="uni-combox__input" type="text" :placeholder="placeholder" 
-			placeholder-class="uni-combox__input-plac" v-model="inputVal" @input="onInput" @focus="onFocus" 
-@blur="onBlur" />
-			<uni-icons :type="showSelector? 'top' : 'bottom'" size="14" color="#999" @click="toggleSelector">
+			<input class="uni-combox__input" type="text" :placeholder="placeholder" placeholder-class="uni-combox__input-plac"
+				v-model="inputVal" @input="onInput" @focus="onFocus" @blur="onBlur" />
+			<uni-icons v-if="!inputVal || !clearAble" :type="showSelector? 'top' : 'bottom'" size="14" color="#999" @click="toggleSelector">
+			</uni-icons>
+			<uni-icons v-if="inputVal && clearAble" type="clear" size="24" color="#999" @click="clean">
 			</uni-icons>
 		</view>
 		<view class="uni-combox__selector" v-if="showSelector">
@@ -16,8 +17,8 @@
 				<view class="uni-combox__selector-empty" v-if="filterCandidatesLength === 0">
 					<text>{{emptyTips}}</text>
 				</view>
-				<view class="uni-combox__selector-item" v-for="(item,index) in filterCandidates" :key="index" 
-				@click="onSelectorClick(index)">
+				<view class="uni-combox__selector-item" v-for="(item,index) in filterCandidates" :key="index"
+					@click="onSelectorClick(index)">
 					<text>{{item}}</text>
 				</view>
 			</scroll-view>
@@ -41,6 +42,10 @@
 		name: 'uniCombox',
 		emits: ['input', 'update:modelValue'],
 		props: {
+			clearAble: {
+				type: Boolean,
+				default: false
+			},
 			border: {
 				type: Boolean,
 				default: true
@@ -143,6 +148,10 @@
 					this.$emit('input', this.inputVal)
 					this.$emit('update:modelValue', this.inputVal)
 				})
+			},
+			clean() {
+				this.inputVal = ''
+				this.onInput()
 			}
 		}
 	}
@@ -272,4 +281,4 @@
 	.uni-combox__no-border {
 		border: none;
 	}
-</style>
+</style>