Select add prefix prop and slot. close #5477

src/components/select/select-head.vue

@@ -1,5 +1,10 @@
 <template>
     <div @click="onHeaderClick">
+        <span :class="[prefixCls + '-prefix']" v-if="$slots.prefix || prefix">
+            <slot name="prefix">
+                <Icon :type="prefix" v-if="prefix" />
+            </slot>
+        </span>
         <div class="ivu-tag ivu-tag-checked" v-for="item in selectedMultiple">
             <span class="ivu-tag-text">{{ item.label }}</span>
             <Icon type="ios-close" @click.native.stop="removeTag(item)"></Icon>
@@ -77,7 +82,10 @@
             queryProp: {
                 type: String,
                 default: ''
-            }
+            },
+            prefix: {
+                type: String
+            },
         },
         data () {
             return {
@@ -92,6 +100,7 @@
             singleDisplayClasses(){
                 const {filterable, multiple, showPlaceholder} = this;
                 return [{
+                    [prefixCls + '-head-with-prefix']: this.$slots.prefix || this.prefix,
                     [prefixCls + '-placeholder']: showPlaceholder && !filterable,
                     [prefixCls + '-selected-value']: !showPlaceholder && !multiple && !filterable,
                 }];

src/components/select/select.vue

@@ -33,6 +33,7 @@
                     :multiple="multiple"
                     :values="values"
                     :clearable="canBeCleared"
+                    :prefix="prefix"
                     :disabled="disabled"
                     :remote="remote"
                     :input-element-id="elementId"
@@ -44,7 +45,9 @@
                     @on-input-focus="isFocused = true"
                     @on-input-blur="isFocused = false"
                     @on-clear="clearSingleSelect"
-                />
+                >
+                    <slot name="prefix" slot="prefix"></slot>
+                </select-head>
             </slot>
         </div>
         <transition name="transition-drop">
@@ -235,6 +238,9 @@
             transferClassName: {
                 type: String
             },
+            prefix: {
+                type: String
+            },
         },
         mounted(){
             this.$on('on-select-selected', this.onOptionClick);