## Input 输入框

通过鼠标或键盘输入字符

:::warning
Input 为受控组件，它**总会显示 Vue 绑定值**。

通常情况下，应当处理 `input` 事件，并更新组件的绑定值（或使用`v-model`）。否则，输入框内显示的值将不会改变。

不支持 `v-model` 修饰符。
:::

### 基础用法

:::demo
```html
<el-input v-model="input" placeholder="请输入内容"></el-input>

<script>
export default {
  data() {
    return {
      input: ''
    }
  }
}
</script>
```
:::


### 禁用状态

:::demo 通过 `disabled` 属性指定是否禁用 input 组件
```html
<el-input
  placeholder="请输入内容"
  v-model="input"
  :disabled="true">
</el-input>

<script>
export default {
  data() {
    return {
      input: ''
    }
  }
}
</script>
```
:::

### 可清空

:::demo 使用`clearable`属性即可得到一个可清空的输入框

```html
<el-input
  placeholder="请输入内容"
  v-model="input"
  clearable>
</el-input>

<script>
  export default {
    data() {
      return {
        input: ''
      }
    }
  }
</script>
```
:::

### 密码框

:::demo 使用`show-password`属性即可得到一个可切换显示隐藏的密码框

```html
<el-input placeholder="请输入密码" v-model="input" show-password></el-input>

<script>
  export default {
    data() {
      return {
        input: ''
      }
    }
  }
</script>
```
:::

### 带 icon 的输入框

带有图标标记输入类型

:::demo 可以通过 `prefix-icon` 和 `suffix-icon` 属性在 input 组件首部和尾部增加显示图标，也可以通过 slot 来放置图标。
```html
<div class="demo-input-suffix">
  属性方式：
  <el-input
    placeholder="请选择日期"
    suffix-icon="el-icon-date"
    v-model="input1">
  </el-input>
  <el-input
    placeholder="请输入内容"
    prefix-icon="el-icon-search"
    v-model="input2">
  </el-input>
</div>
<div class="demo-input-suffix">
  slot 方式：
  <el-input
    placeholder="请选择日期"
    v-model="input3">
    <i slot="suffix" class="el-input__icon el-icon-date"></i>
  </el-input>
  <el-input
    placeholder="请输入内容"
    v-model="input4">
    <i slot="prefix" class="el-input__icon el-icon-search"></i>
  </el-input>
</div>

<script>
export default {
  data() {
    return {
      input1: '',
      input2: '',
      input3: '',
      input4: ''
    }
  }
}
</script>
```
:::

### 文本域

用于输入多行文本信息，通过将 `type` 属性的值指定为 textarea。

:::demo 文本域高度可通过 `rows` 属性控制
```html
<el-input
  type="textarea"
  :rows="2"
  placeholder="请输入内容"
  v-model="textarea">
</el-input>

<script>
export default {
  data() {
    return {
      textarea: ''
    }
  }
}
</script>
```
:::

### 可自适应文本高度的文本域

通过设置 `autosize` 属性可以使得文本域的高度能够根据文本内容自动进行调整，并且 `autosize` 还可以设定为一个对象，指定最小行数和最大行数。

:::demo
```html
<el-input
  type="textarea"
  autosize
  placeholder="请输入内容"
  v-model="textarea1">
</el-input>
<div style="margin: 20px 0;"></div>
<el-input
  type="textarea"
  :autosize="{ minRows: 2, maxRows: 4}"
  placeholder="请输入内容"
  v-model="textarea2">
</el-input>

<script>
export default {
  data() {
    return {
      textarea1: '',
      textarea2: ''
    }
  }
}
</script>
```
:::

### 复合型输入框

可前置或后置元素，一般为标签或按钮

:::demo 可通过 slot 来指定在 input 中前置或者后置内容。
```html
<div>
  <el-input placeholder="请输入内容" v-model="input1">
    <template slot="prepend">Http://</template>
  </el-input>
</div>
<div style="margin-top: 15px;">
  <el-input placeholder="请输入内容" v-model="input2">
    <template slot="append">.com</template>
  </el-input>
</div>
<div style="margin-top: 15px;">
  <el-input placeholder="请输入内容" v-model="input3" class="input-with-select">
    <el-select v-model="select" slot="prepend" placeholder="请选择">
      <el-option label="餐厅名" value="1"></el-option>
      <el-option label="订单号" value="2"></el-option>
      <el-option label="用户电话" value="3"></el-option>
    </el-select>
    <el-button slot="append" icon="el-icon-search"></el-button>
  </el-input>
</div>
<style>
  .el-select .el-input {
    width: 130px;
  }
  .input-with-select .el-input-group__prepend {
    background-color: #fff;
  }
</style>
<script>
export default {
  data() {
    return {
      input1: '',
      input2: '',
      input3: '',
      select: ''
    }
  }
}
</script>
```
:::

### 尺寸

:::demo 可通过 `size` 属性指定输入框的尺寸，除了默认的大小外，还提供了 medium、small 和 mini 三种尺寸。
```html
<div class="demo-input-size">
  <el-input
    placeholder="请输入内容"
    suffix-icon="el-icon-date"
    v-model="input1">
  </el-input>
  <el-input
    size="medium"
    placeholder="请输入内容"
    suffix-icon="el-icon-date"
    v-model="input2">
  </el-input>
  <el-input
    size="small"
    placeholder="请输入内容"
    suffix-icon="el-icon-date"
    v-model="input3">
  </el-input>
  <el-input
    size="mini"
    placeholder="请输入内容"
    suffix-icon="el-icon-date"
    v-model="input4">
  </el-input>
</div>

<script>
export default {
  data() {
    return {
      input1: '',
      input2: '',
      input3: '',
      input4: ''
    }
  }
}
</script>
```
:::

### 带输入建议

根据输入内容提供对应的输入建议

:::demo autocomplete 是一个可带输入建议的输入框组件，`fetch-suggestions` 是一个返回输入建议的方法属性，如 querySearch(queryString, cb)，在该方法中你可以在你的输入建议数据准备好时通过 cb(data) 返回到 autocomplete 组件中。
```html
<el-row class="demo-autocomplete">
  <el-col :span="12">
    <div class="sub-title">激活即列出输入建议</div>
    <el-autocomplete
      class="inline-input"
      v-model="state1"
      :fetch-suggestions="querySearch"
      placeholder="请输入内容"
      @select="handleSelect"
    ></el-autocomplete>
  </el-col>
  <el-col :span="12">
    <div class="sub-title">输入后匹配输入建议</div>
    <el-autocomplete
      class="inline-input"
      v-model="state2"
      :fetch-suggestions="querySearch"
      placeholder="请输入内容"
      :trigger-on-focus="false"
      @select="handleSelect"
    ></el-autocomplete>
  </el-col>
</el-row>
<script>
  export default {
    data() {
      return {
        restaurants: [],
        state1: '',
        state2: ''
      };
    },
    methods: {
      querySearch(queryString, cb) {
        var restaurants = this.restaurants;
        var results = queryString ? restaurants.filter(this.createFilter(queryString)) : restaurants;
        // 调用 callback 返回建议列表的数据
        cb(results);
      },
      createFilter(queryString) {
        return (restaurant) => {
          return (restaurant.value.toLowerCase().indexOf(queryString.toLowerCase()) === 0);
        };
      },
      loadAll() {
        return [
          { "value": "三全鲜食（北新泾店）", "address": "长宁区新渔路144号" },
          { "value": "Hot honey 首尔炸鸡（仙霞路）", "address": "上海市长宁区淞虹路661号" },
          { "value": "新旺角茶餐厅", "address": "上海市普陀区真北路988号创邑金沙谷6号楼113" },
          { "value": "泷千家(天山西路店)", "address": "天山西路438号" },
          { "value": "胖仙女纸杯蛋糕（上海凌空店）", "address": "上海市长宁区金钟路968号1幢18号楼一层商铺18-101" },
          { "value": "贡茶", "address": "上海市长宁区金钟路633号" },
          { "value": "豪大大香鸡排超级奶爸", "address": "上海市嘉定区曹安公路曹安路1685号" },
          { "value": "茶芝兰（奶茶，手抓饼）", "address": "上海市普陀区同普路1435号" },
          { "value": "十二泷町", "address": "上海市北翟路1444弄81号B幢-107" },
          { "value": "星移浓缩咖啡", "address": "上海市嘉定区新郁路817号" },
          { "value": "阿姨奶茶/豪大大", "address": "嘉定区曹安路1611号" },
          { "value": "新麦甜四季甜品炸鸡", "address": "嘉定区曹安公路2383弄55号" },
          { "value": "Monica摩托主题咖啡店", "address": "嘉定区江桥镇曹安公路2409号1F，2383弄62号1F" },
          { "value": "浮生若茶（凌空soho店）", "address": "上海长宁区金钟路968号9号楼地下一层" },
          { "value": "NONO JUICE  鲜榨果汁", "address": "上海市长宁区天山西路119号" },
          { "value": "CoCo都可(北新泾店）", "address": "上海市长宁区仙霞西路" },
          { "value": "快乐柠檬（神州智慧店）", "address": "上海市长宁区天山西路567号1层R117号店铺" },
          { "value": "Merci Paul cafe", "address": "上海市普陀区光复西路丹巴路28弄6号楼819" },
          { "value": "猫山王（西郊百联店）", "address": "上海市长宁区仙霞西路88号第一层G05-F01-1-306" },
          { "value": "枪会山", "address": "上海市普陀区棕榈路" },
          { "value": "纵食", "address": "元丰天山花园(东门) 双流路267号" },
          { "value": "钱记", "address": "上海市长宁区天山西路" },
          { "value": "壹杯加", "address": "上海市长宁区通协路" },
          { "value": "唦哇嘀咖", "address": "上海市长宁区新泾镇金钟路999号2幢（B幢）第01层第1-02A单元" },
          { "value": "爱茜茜里(西郊百联)", "address": "长宁区仙霞西路88号1305室" },
          { "value": "爱茜茜里(近铁广场)", "address": "上海市普陀区真北路818号近铁城市广场北区地下二楼N-B2-O2-C商铺" },
          { "value": "鲜果榨汁（金沙江路和美广店）", "address": "普陀区金沙江路2239号金沙和美广场B1-10-6" },
          { "value": "开心丽果（缤谷店）", "address": "上海市长宁区威宁路天山路341号" },
          { "value": "超级鸡车（丰庄路店）", "address": "上海市嘉定区丰庄路240号" },
          { "value": "妙生活果园（北新泾店）", "address": "长宁区新渔路144号" },
          { "value": "香宜度麻辣香锅", "address": "长宁区淞虹路148号" },
          { "value": "凡仔汉堡（老真北路店）", "address": "上海市普陀区老真北路160号" },
          { "value": "港式小铺", "address": "上海市长宁区金钟路968号15楼15-105室" },
          { "value": "蜀香源麻辣香锅（剑河路店）", "address": "剑河路443-1" },
          { "value": "北京饺子馆", "address": "长宁区北新泾街道天山西路490-1号" },
          { "value": "饭典*新简餐（凌空SOHO店）", "address": "上海市长宁区金钟路968号9号楼地下一层9-83室" },
          { "value": "焦耳·川式快餐（金钟路店）", "address": "上海市金钟路633号地下一层甲部" },
          { "value": "动力鸡车", "address": "长宁区仙霞西路299弄3号101B" },
          { "value": "浏阳蒸菜", "address": "天山西路430号" },
          { "value": "四海游龙（天山西路店）", "address": "上海市长宁区天山西路" },
          { "value": "樱花食堂（凌空店）", "address": "上海市长宁区金钟路968号15楼15-105室" },
          { "value": "壹分米客家传统调制米粉(天山店)", "address": "天山西路428号" },
          { "value": "福荣祥烧腊（平溪路店）", "address": "上海市长宁区协和路福泉路255弄57-73号" },
          { "value": "速记黄焖鸡米饭", "address": "上海市长宁区北新泾街道金钟路180号1层01号摊位" },
          { "value": "红辣椒麻辣烫", "address": "上海市长宁区天山西路492号" },
          { "value": "(小杨生煎)西郊百联餐厅", "address": "长宁区仙霞西路88号百联2楼" },
          { "value": "阳阳麻辣烫", "address": "天山西路389号" },
          { "value": "南拳妈妈龙虾盖浇饭", "address": "普陀区金沙江路1699号鑫乐惠美食广场A13" }
        ];
      },
      handleSelect(item) {
        console.log(item);
      }
    },
    mounted() {
      this.restaurants = this.loadAll();
    }
  }
</script>
```
:::

### 自定义模板

可自定义输入建议的显示

:::demo 使用`scoped slot`自定义输入建议的模板。该 scope 的参数为`item`，表示当前输入建议对象。
```html
<el-autocomplete
  popper-class="my-autocomplete"
  v-model="state"
  :fetch-suggestions="querySearch"
  placeholder="请输入内容"
  @select="handleSelect">
  <i
    class="el-icon-edit el-input__icon"
    slot="suffix"
    @click="handleIconClick">
  </i>
  <template slot-scope="{ item }">
    <div class="name">{{ item.value }}</div>
    <span class="addr">{{ item.address }}</span>
  </template>
</el-autocomplete>

<style>
.my-autocomplete {
  li {
    line-height: normal;
    padding: 7px;

    .name {
      text-overflow: ellipsis;
      overflow: hidden;
    }
    .addr {
      font-size: 12px;
      color: #b4b4b4;
    }

    .highlighted .addr {
      color: #ddd;
    }
  }
}
</style>

<script>
  export default {
    data() {
      return {
        restaurants: [],
        state: ''
      };
    },
    methods: {
      querySearch(queryString, cb) {
        var restaurants = this.restaurants;
        var results = queryString ? restaurants.filter(this.createFilter(queryString)) : restaurants;
        // 调用 callback 返回建议列表的数据
        cb(results);
      },
      createFilter(queryString) {
        return (restaurant) => {
          return (restaurant.value.toLowerCase().indexOf(queryString.toLowerCase()) === 0);
        };
      },
      loadAll() {
        return [
          { "value": "三全鲜食（北新泾店）", "address": "长宁区新渔路144号" },
          { "value": "Hot honey 首尔炸鸡（仙霞路）", "address": "上海市长宁区淞虹路661号" },
          { "value": "新旺角茶餐厅", "address": "上海市普陀区真北路988号创邑金沙谷6号楼113" },
          { "value": "泷千家(天山西路店)", "address": "天山西路438号" },
          { "value": "胖仙女纸杯蛋糕（上海凌空店）", "address": "上海市长宁区金钟路968号1幢18号楼一层商铺18-101" },
          { "value": "贡茶", "address": "上海市长宁区金钟路633号" },
          { "value": "豪大大香鸡排超级奶爸", "address": "上海市嘉定区曹安公路曹安路1685号" },
          { "value": "茶芝兰（奶茶，手抓饼）", "address": "上海市普陀区同普路1435号" },
          { "value": "十二泷町", "address": "上海市北翟路1444弄81号B幢-107" },
          { "value": "星移浓缩咖啡", "address": "上海市嘉定区新郁路817号" },
          { "value": "阿姨奶茶/豪大大", "address": "嘉定区曹安路1611号" },
          { "value": "新麦甜四季甜品炸鸡", "address": "嘉定区曹安公路2383弄55号" },
          { "value": "Monica摩托主题咖啡店", "address": "嘉定区江桥镇曹安公路2409号1F，2383弄62号1F" },
          { "value": "浮生若茶（凌空soho店）", "address": "上海长宁区金钟路968号9号楼地下一层" },
          { "value": "NONO JUICE  鲜榨果汁", "address": "上海市长宁区天山西路119号" },
          { "value": "CoCo都可(北新泾店）", "address": "上海市长宁区仙霞西路" },
          { "value": "快乐柠檬（神州智慧店）", "address": "上海市长宁区天山西路567号1层R117号店铺" },
          { "value": "Merci Paul cafe", "address": "上海市普陀区光复西路丹巴路28弄6号楼819" },
          { "value": "猫山王（西郊百联店）", "address": "上海市长宁区仙霞西路88号第一层G05-F01-1-306" },
          { "value": "枪会山", "address": "上海市普陀区棕榈路" },
          { "value": "纵食", "address": "元丰天山花园(东门) 双流路267号" },
          { "value": "钱记", "address": "上海市长宁区天山西路" },
          { "value": "壹杯加", "address": "上海市长宁区通协路" },
          { "value": "唦哇嘀咖", "address": "上海市长宁区新泾镇金钟路999号2幢（B幢）第01层第1-02A单元" },
          { "value": "爱茜茜里(西郊百联)", "address": "长宁区仙霞西路88号1305室" },
          { "value": "爱茜茜里(近铁广场)", "address": "上海市普陀区真北路818号近铁城市广场北区地下二楼N-B2-O2-C商铺" },
          { "value": "鲜果榨汁（金沙江路和美广店）", "address": "普陀区金沙江路2239号金沙和美广场B1-10-6" },
          { "value": "开心丽果（缤谷店）", "address": "上海市长宁区威宁路天山路341号" },
          { "value": "超级鸡车（丰庄路店）", "address": "上海市嘉定区丰庄路240号" },
          { "value": "妙生活果园（北新泾店）", "address": "长宁区新渔路144号" },
          { "value": "香宜度麻辣香锅", "address": "长宁区淞虹路148号" },
          { "value": "凡仔汉堡（老真北路店）", "address": "上海市普陀区老真北路160号" },
          { "value": "港式小铺", "address": "上海市长宁区金钟路968号15楼15-105室" },
          { "value": "蜀香源麻辣香锅（剑河路店）", "address": "剑河路443-1" },
          { "value": "北京饺子馆", "address": "长宁区北新泾街道天山西路490-1号" },
          { "value": "饭典*新简餐（凌空SOHO店）", "address": "上海市长宁区金钟路968号9号楼地下一层9-83室" },
          { "value": "焦耳·川式快餐（金钟路店）", "address": "上海市金钟路633号地下一层甲部" },
          { "value": "动力鸡车", "address": "长宁区仙霞西路299弄3号101B" },
          { "value": "浏阳蒸菜", "address": "天山西路430号" },
          { "value": "四海游龙（天山西路店）", "address": "上海市长宁区天山西路" },
          { "value": "樱花食堂（凌空店）", "address": "上海市长宁区金钟路968号15楼15-105室" },
          { "value": "壹分米客家传统调制米粉(天山店)", "address": "天山西路428号" },
          { "value": "福荣祥烧腊（平溪路店）", "address": "上海市长宁区协和路福泉路255弄57-73号" },
          { "value": "速记黄焖鸡米饭", "address": "上海市长宁区北新泾街道金钟路180号1层01号摊位" },
          { "value": "红辣椒麻辣烫", "address": "上海市长宁区天山西路492号" },
          { "value": "(小杨生煎)西郊百联餐厅", "address": "长宁区仙霞西路88号百联2楼" },
          { "value": "阳阳麻辣烫", "address": "天山西路389号" },
          { "value": "南拳妈妈龙虾盖浇饭", "address": "普陀区金沙江路1699号鑫乐惠美食广场A13" }
        ];
      },
      handleSelect(item) {
        console.log(item);
      },
      handleIconClick(ev) {
        console.log(ev);
      }
    },
    mounted() {
      this.restaurants = this.loadAll();
    }
  }
</script>
```
:::

### 远程搜索

从服务端搜索数据

:::demo
```html
<el-autocomplete
  v-model="state"
  :fetch-suggestions="querySearchAsync"
  placeholder="请输入内容"
  @select="handleSelect"
></el-autocomplete>
<script>
  export default {
    data() {
      return {
        restaurants: [],
        state: '',
        timeout:  null
      };
    },
    methods: {
      loadAll() {
        return [
          { "value": "三全鲜食（北新泾店）", "address": "长宁区新渔路144号" },
          { "value": "Hot honey 首尔炸鸡（仙霞路）", "address": "上海市长宁区淞虹路661号" },
          { "value": "新旺角茶餐厅", "address": "上海市普陀区真北路988号创邑金沙谷6号楼113" },
          { "value": "泷千家(天山西路店)", "address": "天山西路438号" },
          { "value": "胖仙女纸杯蛋糕（上海凌空店）", "address": "上海市长宁区金钟路968号1幢18号楼一层商铺18-101" },
          { "value": "贡茶", "address": "上海市长宁区金钟路633号" },
          { "value": "豪大大香鸡排超级奶爸", "address": "上海市嘉定区曹安公路曹安路1685号" },
          { "value": "茶芝兰（奶茶，手抓饼）", "address": "上海市普陀区同普路1435号" },
          { "value": "十二泷町", "address": "上海市北翟路1444弄81号B幢-107" },
          { "value": "星移浓缩咖啡", "address": "上海市嘉定区新郁路817号" },
          { "value": "阿姨奶茶/豪大大", "address": "嘉定区曹安路1611号" },
          { "value": "新麦甜四季甜品炸鸡", "address": "嘉定区曹安公路2383弄55号" },
          { "value": "Monica摩托主题咖啡店", "address": "嘉定区江桥镇曹安公路2409号1F，2383弄62号1F" },
          { "value": "浮生若茶（凌空soho店）", "address": "上海长宁区金钟路968号9号楼地下一层" },
          { "value": "NONO JUICE  鲜榨果汁", "address": "上海市长宁区天山西路119号" },
          { "value": "CoCo都可(北新泾店）", "address": "上海市长宁区仙霞西路" },
          { "value": "快乐柠檬（神州智慧店）", "address": "上海市长宁区天山西路567号1层R117号店铺" },
          { "value": "Merci Paul cafe", "address": "上海市普陀区光复西路丹巴路28弄6号楼819" },
          { "value": "猫山王（西郊百联店）", "address": "上海市长宁区仙霞西路88号第一层G05-F01-1-306" },
          { "value": "枪会山", "address": "上海市普陀区棕榈路" },
          { "value": "纵食", "address": "元丰天山花园(东门) 双流路267号" },
          { "value": "钱记", "address": "上海市长宁区天山西路" },
          { "value": "壹杯加", "address": "上海市长宁区通协路" },
          { "value": "唦哇嘀咖", "address": "上海市长宁区新泾镇金钟路999号2幢（B幢）第01层第1-02A单元" },
          { "value": "爱茜茜里(西郊百联)", "address": "长宁区仙霞西路88号1305室" },
          { "value": "爱茜茜里(近铁广场)", "address": "上海市普陀区真北路818号近铁城市广场北区地下二楼N-B2-O2-C商铺" },
          { "value": "鲜果榨汁（金沙江路和美广店）", "address": "普陀区金沙江路2239号金沙和美广场B1-10-6" },
          { "value": "开心丽果（缤谷店）", "address": "上海市长宁区威宁路天山路341号" },
          { "value": "超级鸡车（丰庄路店）", "address": "上海市嘉定区丰庄路240号" },
          { "value": "妙生活果园（北新泾店）", "address": "长宁区新渔路144号" },
          { "value": "香宜度麻辣香锅", "address": "长宁区淞虹路148号" },
          { "value": "凡仔汉堡（老真北路店）", "address": "上海市普陀区老真北路160号" },
          { "value": "港式小铺", "address": "上海市长宁区金钟路968号15楼15-105室" },
          { "value": "蜀香源麻辣香锅（剑河路店）", "address": "剑河路443-1" },
          { "value": "北京饺子馆", "address": "长宁区北新泾街道天山西路490-1号" },
          { "value": "饭典*新简餐（凌空SOHO店）", "address": "上海市长宁区金钟路968号9号楼地下一层9-83室" },
          { "value": "焦耳·川式快餐（金钟路店）", "address": "上海市金钟路633号地下一层甲部" },
          { "value": "动力鸡车", "address": "长宁区仙霞西路299弄3号101B" },
          { "value": "浏阳蒸菜", "address": "天山西路430号" },
          { "value": "四海游龙（天山西路店）", "address": "上海市长宁区天山西路" },
          { "value": "樱花食堂（凌空店）", "address": "上海市长宁区金钟路968号15楼15-105室" },
          { "value": "壹分米客家传统调制米粉(天山店)", "address": "天山西路428号" },
          { "value": "福荣祥烧腊（平溪路店）", "address": "上海市长宁区协和路福泉路255弄57-73号" },
          { "value": "速记黄焖鸡米饭", "address": "上海市长宁区北新泾街道金钟路180号1层01号摊位" },
          { "value": "红辣椒麻辣烫", "address": "上海市长宁区天山西路492号" },
          { "value": "(小杨生煎)西郊百联餐厅", "address": "长宁区仙霞西路88号百联2楼" },
          { "value": "阳阳麻辣烫", "address": "天山西路389号" },
          { "value": "南拳妈妈龙虾盖浇饭", "address": "普陀区金沙江路1699号鑫乐惠美食广场A13" }
        ];
      },
      querySearchAsync(queryString, cb) {
        var restaurants = this.restaurants;
        var results = queryString ? restaurants.filter(this.createStateFilter(queryString)) : restaurants;

        clearTimeout(this.timeout);
        this.timeout = setTimeout(() => {
          cb(results);
        }, 3000 * Math.random());
      },
      createStateFilter(queryString) {
        return (state) => {
          return (state.value.toLowerCase().indexOf(queryString.toLowerCase()) === 0);
        };
      },
      handleSelect(item) {
        console.log(item);
      }
    },
    mounted() {
      this.restaurants = this.loadAll();
    }
  };
</script>
```
:::

### 输入长度限制

:::demo  `maxlength` 和 `minlength` 是原生属性，用来限制输入框的字符长度，其中字符长度是用 Javascript 的字符串长度统计的。对于类型为 `text` 或 `textarea` 的输入框，在使用 `maxlength` 属性限制最大输入长度的同时，可通过设置 `show-word-limit` 属性来展示字数统计。
```html
<el-input
  type="text"
  placeholder="请输入内容"
  v-model="text"
  maxlength="10"
  show-word-limit
>
</el-input>
<div style="margin: 20px 0;"></div>
<el-input
  type="textarea"
  placeholder="请输入内容"
  v-model="textarea"
  maxlength="30"
  show-word-limit
>
</el-input>

<script>
export default {
  data() {
    return {
      text: '',
      textarea: ''
    }
  }
}
</script>
```
:::

### Input Attributes

| 参数          | 说明            | 类型            | 可选值                 | 默认值   |
|-------------  |---------------- |---------------- |---------------------- |-------- |
| type         | 类型   | string  | text，textarea 和其他 [原生 input 的 type 值](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input#Form_%3Cinput%3E_types) | text |
| value / v-model | 绑定值           | string / number  | — | — |
| maxlength     | 原生属性，最大输入长度      | number          |  —  | — |
| minlength     | 原生属性，最小输入长度      | number          | — | — |
| show-word-limit | 是否显示输入字数统计，只在 `type = "text"` 或 `type = "textarea"` 时有效 | boolean    |  —  | false |
| placeholder   | 输入框占位文本    | string          | — | — |
| clearable     | 是否可清空        | boolean         | — | false |
| show-password | 是否显示切换密码图标| boolean         | — | false |
| disabled      | 禁用            | boolean         | — | false   |
| size          | 输入框尺寸，只在 `type!="textarea"` 时有效      | string          | medium / small / mini  | — |
| prefix-icon   | 输入框头部图标    | string          | — | — |
| suffix-icon   | 输入框尾部图标    | string          | — | — |
| rows          | 输入框行数，只对 `type="textarea"` 有效  |  number | — |  2   |
| autosize      | 自适应内容高度，只对 `type="textarea"` 有效，可传入对象，如，{ minRows: 2, maxRows: 6 }  |  boolean / object | — |  false   |
| autocomplete | 原生属性，自动补全 | string | on, off | off |
| auto-complete | 下个主版本弃用 | string | on, off | off |
| name | 原生属性 | string | — | — |
| readonly | 原生属性，是否只读 | boolean | — | false |
| max | 原生属性，设置最大值 | — | — | — |
| min | 原生属性，设置最小值 | — | — | — |
| step | 原生属性，设置输入字段的合法数字间隔 | — | — | — |
| resize | 控制是否能被用户缩放 | string | none, both, horizontal, vertical | — |
| autofocus | 原生属性，自动获取焦点 | boolean | true, false | false |
| form | 原生属性 | string | — | — |
| label | 输入框关联的label文字 | string | — | — |
| tabindex | 输入框的tabindex | string | - | - |
| validate-event | 输入时是否触发表单的校验 | boolean | - | true |

### Input Slots
| name | 说明 |
|------|--------|
| prefix | 输入框头部内容，只对 `type="text"` 有效 |
| suffix | 输入框尾部内容，只对 `type="text"` 有效 |
| prepend | 输入框前置内容，只对 `type="text"` 有效 |
| append | 输入框后置内容，只对 `type="text"` 有效 |

### Input Events
| 事件名称 | 说明 | 回调参数 |
|---------|--------|---------|
| blur | 在 Input 失去焦点时触发 | (event: Event) |
| focus | 在 Input 获得焦点时触发 | (event: Event) |
| change | 仅在输入框失去焦点或用户按下回车时触发 | (value: string \| number) |
| input | 在 Input 值改变时触发 | (value: string \| number) |
| clear | 在点击由 `clearable` 属性生成的清空按钮时触发 | — |

### Input Methods
| 方法名 | 说明 | 参数 |
| ---- | ---- | ---- |
| focus | 使 input 获取焦点 | — |
| blur | 使 input 失去焦点 | — |
| select | 选中 input 中的文字 | — |

### Autocomplete Attributes

| 参数          | 说明            | 类型            | 可选值                 | 默认值   |
|-------------  |---------------- |---------------- |---------------------- |-------- |
| placeholder   | 输入框占位文本   | string          | — | — |
| disabled      | 禁用            | boolean         | — | false   |
| value-key | 输入建议对象中用于显示的键名 | string | — | value |
| value         | 必填值，输入绑定值   | string  | — | — |
| debounce      | 获取输入建议的去抖延时 | number         | — | 300 |
| placement     | 菜单弹出位置 | string         | top / top-start / top-end / bottom / bottom-start / bottom-end | bottom-start |
| fetch-suggestions | 返回输入建议的方法，仅当你的输入建议数据 resolve 时，通过调用 callback(data:[]) 来返回它  | Function(queryString, callback)  | — | — |
| popper-class | Autocomplete 下拉列表的类名 | string | — | — |
| trigger-on-focus | 是否在输入框 focus 时显示建议列表 | boolean | — | true |
| name | 原生属性 | string | — | — |
| select-when-unmatched | 在输入没有任何匹配建议的情况下，按下回车是否触发 `select` 事件 | boolean | — | false |
| label | 输入框关联的label文字 | string | — | — |
| prefix-icon | 输入框头部图标 | string | — | — |
| suffix-icon | 输入框尾部图标 | string | — | — |
| hide-loading | 是否隐藏远程加载时的加载图标 | boolean | — | false |
| popper-append-to-body | 是否将下拉列表插入至 body 元素。在下拉列表的定位出现问题时，可将该属性设置为 false | boolean | - | true |
| highlight-first-item | 是否默认突出显示远程搜索建议中的第一项 | boolean | — | false |

### Autocomplete Slots
| name | 说明 |
|------|--------|
| prefix | 输入框头部内容 |
| suffix | 输入框尾部内容 |
| prepend | 输入框前置内容 |
| append | 输入框后置内容 |

### Autocomplete Scoped Slot
| name | 说明 |
|------|--------|
| — | 自定义输入建议，参数为 { item } |

### Autocomplete Events
| 事件名称 | 说明 | 回调参数 |
|---------|--------|---------|
| select | 点击选中建议项时触发 | 选中建议项 |
| change | 在 Input 值改变时触发 | (value: string \| number) |

### Autocomplete Methods
| 方法名 | 说明 | 参数 |
| ---- | ---- | ---- |
| focus | 使 input 获取焦点 | - |