# Checkbox

### Install

```js
import Vue from 'vue';
import { Checkbox, CheckboxGroup } from 'vant';

Vue.use(Checkbox);
Vue.use(CheckboxGroup);
```

## Usage

### Basic Usage

```html
<van-checkbox v-model="checked">Checkbox</van-checkbox>
```

```js
export default {
  data() {
    return {
      checked: true
    };
  }
};
```

### Disabled

```html
<van-checkbox v-model="checked" disabled>Checkbox</van-checkbox>
```

### Custom Shape

```html
<van-checkbox v-model="checked" shape="square">Checkbox</van-checkbox>
```

### Custom Color

```html
<van-checkbox v-model="checked" checked-color="#07c160">Checkbox</van-checkbox>
```

### Custom Icon Size

```html
<van-checkbox v-model="checked" icon-size="24px">Checkbox</van-checkbox>
```

### Custom Icon

Use icon slot to custom icon

```html
<van-checkbox v-model="checked">
  customize icon
  <template #icon="props">
    <img
      class="img-icon"
      :src="props.checked ? activeIcon : inactiveIcon"
    />
</template>

</van-checkbox>

<style>
.img-icon {
  height: 20px;  
}
</style>
```

```js
export default {
  data() {
    return {
      checked: true,
      activeIcon: 'https://img.yzcdn.cn/vant/user-active.png',
      inactiveIcon: 'https://img.yzcdn.cn/vant/user-inactive.png'
    };
  }
};
```

### Disable Label Click

```html
<van-checkbox v-model="checked" label-disabled>Checkbox</van-checkbox>
```

### Checkbox Group

When Checkboxes are inside a CheckboxGroup, the checked checkboxes's name is an array and bound with CheckboxGroup by v-model.

```html
<van-checkbox-group v-model="result">
  <van-checkbox name="a">Checkbox a</van-checkbox>
  <van-checkbox name="b">Checkbox b</van-checkbox>
</van-checkbox-group>
```

```js
export default {
  data() {
    return {
      result: ['a', 'b']
    };
  }
};
```

### Horizontal

```html
<van-checkbox-group v-model="result" direction="horizontal">
  <van-checkbox name="a">Checkbox a</van-checkbox>
  <van-checkbox name="b">Checkbox b</van-checkbox>
</van-checkbox-group>
```

```js
export default {
  data() {
    return {
      result: []
    };
  }
};
```

### Maximum amount of checked options

```html
<van-checkbox-group v-model="result" :max="2">
  <van-checkbox name="a">Checkbox a</van-checkbox>
  <van-checkbox name="b">Checkbox b</van-checkbox>
  <van-checkbox name="c">Checkbox c</van-checkbox>
</van-checkbox-group>
```

### Toggle All

```html
<van-checkbox-group v-model="result" ref="checkboxGroup">
  <van-checkbox name="a">Checkbox a</van-checkbox>
  <van-checkbox name="b">Checkbox b</van-checkbox>
  <van-checkbox name="c">Checkbox c</van-checkbox>
</van-checkbox-group>

<van-button type="primary" @click="checkAll">Check All</van-button>
<van-button type="info" @click="toggleAll">Toggle All</van-button>
```

```js
export default {
  data() {
    return {
      result: []
    }
  },
  methods: {
    checkAll() {
      this.$refs.checkboxGroup.toggleAll(true);
    },
    toggleAll() {
      this.$refs.checkboxGroup.toggleAll();
    }
  }
}
```

### Inside a Cell

```html
<van-checkbox-group v-model="result">
  <van-cell-group>
    <van-cell
      v-for="(item, index) in list"
      clickable
      :key="item"
      :title="`Checkbox ${item}`"
      @click="toggle(index)"
    >
    <template #right-icon>
      <van-checkbox :name="item" ref="checkboxes" />
    </template>
    </van-cell>
  </van-cell-group>
</van-checkbox-group>
```

```js
export default {
  data() {
    return {
      list: ['a', 'b']
      result: []
    };
  },
  methods: {
    toggle(index) {
      this.$refs.checkboxes[index].toggle();
    }
  }
}
```

## API

### Checkbox Props

| Attribute | Description | Type | Default |
|------|------|------|------|
| v-model (value) | Check status | *boolean* | `false` |
| name | Checkbox name | *any* | - |
| shape | Can be set to `square` | *string* | `round` |
| disabled | Disable checkbox | *boolean* | `false` |
| label-disabled | Whether to disable label click | *boolean* | `false` |
| label-position | Can be set to `left` | *string* | `right` |
| icon-size | Icon size | *number \| string* | `20px` |
| checked-color | Checked color | *string* | `#1989fa` | - |
| bind-group `v2.2.4` | Whether to bind with CheckboxGroup | *boolean* | `true` |

### CheckboxGroup Props

| Attribute | Description | Type | Default |
|------|------|------|------|
| v-model (value) | Names of all checked checkboxes | *any[]* | - |
| disabled | Whether to disable all checkboxes | *boolean* | `false` |
| max | Maximum amount of checked options | *number \| string* | `0`(Unlimited) |
| direction `v2.5.0` | Direction, can be set to `horizontal` | *string* | `vertical` |
| icon-size `v2.2.3` | Icon size of all checkboxes | *number \| string* | `20px` |
| checked-color `v2.2.3` | Checked color of all checkboxes | *string* | `#1989fa` | - |

### Checkbox Events

| Event | Description | Parameters |
|------|------|------|
| change | Triggered when value changed | *checked: boolean* |
| click | Triggered when click checkbox | *event: Event* |

### CheckboxGroup Events

| Event | Description | Parameters |
|------|------|------|
| change | Triggered when value changed | *names: any[]* |

### Checkbox Slots

| Name | Description | SlotProps |
|------|------|------|
| default | Custom label | - |
| icon | Custom icon | *checked: boolean* |

### CheckboxGroup Methods

Use [ref](https://vuejs.org/v2/api/#ref) to get CheckboxGroup instance and call instance methods

| Name | Description | Attribute | Return value |
|------|------|------|------|
| toggleAll | Toggle check status of all checkboxes | *checked?: boolean* | - |

### Checkbox Methods

Use [ref](https://vuejs.org/v2/api/#ref) to get Checkbox instance and call instance methods

| Name | Description | Attribute | Return value |
|------|------|------|------|
| toggle | Toggle check status | *checked?: boolean* | - |