element-plus/website/docs/en-US/checkbox.md

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## Checkbox
A group of options for multiple choices.
### Basic usage
Checkbox can be used alone to switch between two states.
:::demo Define `v-model`(bind variable) in `el-checkbox`. The default value is a `Boolean` for single `checkbox`, and it becomes `true` when selected. Content inside the `el-checkbox` tag will become the description following the button of the checkbox.
```html
<template>
<!-- `checked` should be true or false -->
<el-checkbox v-model="checked">Option</el-checkbox>
</template>
<script>
export default {
data() {
return {
checked: true
};
}
};
</script>
<!--
<setup>
import { defineComponent, ref } from 'vue';
export default defineComponent({
setup() {
const checked = ref(true);
return {
checked,
};
},
});
</setup>
-->
```
:::
### Disabled State
Disabled state for checkbox.
:::demo Set the `disabled` attribute.
```html
<template>
<el-checkbox v-model="checked1" disabled>Option</el-checkbox>
<el-checkbox v-model="checked2" disabled>Option</el-checkbox>
</template>
<script>
export default {
data() {
return {
checked1: false,
checked2: true
};
}
};
</script>
<!--
<setup>
import { defineComponent, ref } from 'vue';
export default defineComponent({
setup() {
const checked1 = ref(false);
const checked2 = ref(true);
return {
checked1,
checked2,
};
},
});
</setup>
-->
```
:::
### Checkbox group
It is used for multiple checkboxes which are bound in one group, and indicates whether one option is selected by checking if it is checked.
:::demo `checkbox-group` element can manage multiple checkboxes in one group by using `v-model` which is bound as an `Array`. Inside the `el-checkbox` element, `label` is the value of the checkbox. If no content is nested in that tag, `label` will be rendered as the description following the button of the checkbox. `label` also corresponds with the element values in the array. It is selected if the specified value exists in the array, and vice versa.
```html
<template>
<el-checkbox-group v-model="checkList">
<el-checkbox label="Option A"></el-checkbox>
<el-checkbox label="Option B"></el-checkbox>
<el-checkbox label="Option C"></el-checkbox>
<el-checkbox label="disabled" disabled></el-checkbox>
<el-checkbox label="selected and disabled" disabled></el-checkbox>
</el-checkbox-group>
</template>
<script>
export default {
data () {
return {
checkList: ['selected and disabled','Option A']
};
}
};
</script>
<!--
<setup>
import { defineComponent, ref } from 'vue';
export default defineComponent({
setup() {
const checkList = ref(['selected and disabled','Option A']);
return {
checkList,
};
},
});
</setup>
-->
```
:::
### Indeterminate
The `indeterminate` property can help you to achieve a 'check all' effect.
:::demo
```html
<template>
<el-checkbox :indeterminate="isIndeterminate" v-model="checkAll" @change="handleCheckAllChange">Check all</el-checkbox>
<div style="margin: 15px 0;"></div>
<el-checkbox-group v-model="checkedCities" @change="handleCheckedCitiesChange">
<el-checkbox v-for="city in cities" :label="city" :key="city">{{city}}</el-checkbox>
</el-checkbox-group>
</template>
<script>
const cityOptions = ['Shanghai', 'Beijing', 'Guangzhou', 'Shenzhen'];
export default {
data() {
return {
checkAll: false,
checkedCities: ['Shanghai', 'Beijing'],
cities: cityOptions,
isIndeterminate: true
};
},
methods: {
handleCheckAllChange(val) {
this.checkedCities = val ? cityOptions : [];
this.isIndeterminate = false;
},
handleCheckedCitiesChange(value) {
let checkedCount = value.length;
this.checkAll = checkedCount === this.cities.length;
this.isIndeterminate = checkedCount > 0 && checkedCount < this.cities.length;
}
}
};
</script>
<!--
<setup>
import { defineComponent, reactive, toRefs } from 'vue';
const cityOptions = ['Shanghai', 'Beijing', 'Guangzhou', 'Shenzhen'];
export default defineComponent({
setup() {
const state = reactive({
checkAll: false,
checkedCities: ['Shanghai', 'Beijing'],
cities: cityOptions,
isIndeterminate: true,
});
const handleCheckAllChange = (val) => {
state.checkedCities = val ? cityOptions : [];
state.isIndeterminate = false;
};
const handleCheckedCitiesChange = (value) => {
const checkedCount = value.length;
state.checkAll = checkedCount === state.cities.length;
state.isIndeterminate = checkedCount > 0 && checkedCount < state.cities.length;
};
return {
...toRefs(state),
handleCheckAllChange,
handleCheckedCitiesChange,
};
},
});
</setup>
-->
```
:::
### Minimum / Maximum items checked
The `min` and `max` properties can help you to limit the number of checked items.
:::demo
```html
<template>
<el-checkbox-group
v-model="checkedCities"
:min="1"
:max="2">
<el-checkbox v-for="city in cities" :label="city" :key="city">{{city}}</el-checkbox>
</el-checkbox-group>
</template>
<script>
const cityOptions = ['Shanghai', 'Beijing', 'Guangzhou', 'Shenzhen'];
export default {
data() {
return {
checkedCities: ['Shanghai', 'Beijing'],
cities: cityOptions
};
}
};
</script>
<!--
<setup>
import { defineComponent, reactive, toRefs } from 'vue';
const cityOptions = ['Shanghai', 'Beijing', 'Guangzhou', 'Shenzhen'];
export default defineComponent({
setup() {
const state = reactive({
checkedCities: ['Shanghai', 'Beijing'],
cities: cityOptions,
});
return {
...toRefs(state),
};
},
});
</setup>
-->
```
:::
### Button style
Checkbox with button styles.
:::demo You just need to change `el-checkbox` element into `el-checkbox-button` element. We also provide `size` attribute.
```html
<template>
<div>
<el-checkbox-group v-model="checkboxGroup1">
<el-checkbox-button v-for="city in cities" :label="city" :key="city">{{city}}</el-checkbox-button>
</el-checkbox-group>
</div>
<div style="margin-top: 20px">
<el-checkbox-group v-model="checkboxGroup2" size="medium">
<el-checkbox-button v-for="city in cities" :label="city" :key="city">{{city}}</el-checkbox-button>
</el-checkbox-group>
</div>
<div style="margin-top: 20px">
<el-checkbox-group v-model="checkboxGroup3" size="small">
<el-checkbox-button v-for="city in cities" :label="city" :disabled="city === 'Beijing'" :key="city">{{city}}</el-checkbox-button>
</el-checkbox-group>
</div>
<div style="margin-top: 20px">
<el-checkbox-group v-model="checkboxGroup4" size="mini" disabled>
<el-checkbox-button v-for="city in cities" :label="city" :key="city">{{city}}</el-checkbox-button>
</el-checkbox-group>
</div>
</template>
<script>
const cityOptions = ['Shanghai', 'Beijing', 'Guangzhou', 'Shenzhen'];
export default {
data () {
return {
checkboxGroup1: ['Shanghai'],
checkboxGroup2: ['Shanghai'],
checkboxGroup3: ['Shanghai'],
checkboxGroup4: ['Shanghai'],
cities: cityOptions
};
}
}
</script>
<!--
<setup>
import { defineComponent, reactive, toRefs } from 'vue';
const cityOptions = ['Shanghai', 'Beijing', 'Guangzhou', 'Shenzhen'];
export default defineComponent({
setup() {
const state = reactive({
checkboxGroup1: ['Shanghai'],
checkboxGroup2: ['Shanghai'],
checkboxGroup3: ['Shanghai'],
checkboxGroup4: ['Shanghai'],
cities: cityOptions,
});
return {
...toRefs(state),
};
},
});
</setup>
-->
```
:::
### With borders
:::demo The `border` attribute adds a border to Checkboxes.
```html
<template>
<div>
<el-checkbox v-model="checked1" label="Option1" border></el-checkbox>
<el-checkbox v-model="checked2" label="Option2" border></el-checkbox>
</div>
<div style="margin-top: 20px">
<el-checkbox v-model="checked3" label="Option1" border size="medium"></el-checkbox>
<el-checkbox v-model="checked4" label="Option2" border size="medium"></el-checkbox>
</div>
<div style="margin-top: 20px">
<el-checkbox-group v-model="checkboxGroup1" size="small">
<el-checkbox label="Option1" border></el-checkbox>
<el-checkbox label="Option2" border disabled></el-checkbox>
</el-checkbox-group>
</div>
<div style="margin-top: 20px">
<el-checkbox-group v-model="checkboxGroup2" size="mini" disabled>
<el-checkbox label="Option1" border></el-checkbox>
<el-checkbox label="Option2" border></el-checkbox>
</el-checkbox-group>
</div>
</template>
<script>
export default {
data () {
return {
checked1: true,
checked2: false,
checked3: false,
checked4: true,
checkboxGroup1: [],
checkboxGroup2: []
};
}
}
</script>
<!--
<setup>
import { defineComponent, reactive, toRefs } from 'vue';
export default defineComponent({
setup() {
const state = reactive({
checked1: true,
checked2: false,
checked3: false,
checked4: true,
checkboxGroup1: [],
checkboxGroup2: [],
});
return {
...toRefs(state),
};
},
});
</setup>
-->
```
:::
### Checkbox Attributes
| Attribute | Description | Type | Accepted Values | Default|
|---------- |-------- |---------- |------------- |-------- |
| model-value / v-model | binding value | string / number / boolean | — | — |
| label | value of the Checkbox when used inside a `checkbox-group` | string / number / boolean | — | — |
| true-label | value of the Checkbox if it's checked | string / number | — | — |
| false-label | value of the Checkbox if it's not checked | string / number | — | — |
| disabled | whether the Checkbox is disabled | boolean | — | false |
| border | whether to add a border around Checkbox | boolean | — | false |
| size | size of the Checkbox, only works when `border` is true | string | medium / small / mini | — |
| name | native 'name' attribute | string | — | — |
| checked | if the Checkbox is checked | boolean | — | false |
| indeterminate | same as `indeterminate` in native checkbox | boolean | — | false |
### Checkbox Events
| Event Name | Description | Parameters |
|---------- |-------- |---------- |
| change | triggers when the binding value changes | the updated value |
### Checkbox-group Attributes
| Attribute | Description | Type | Accepted Values | Default|
|---------- |-------- |---------- |------------- |-------- |
| model-value / v-model | binding value | array | — | — |
|size | size of checkbox buttons or bordered checkboxes | string | medium / small / mini | — |
| disabled | whether the nesting checkboxes are disabled | boolean | — | false |
| min | minimum number of checkbox checked | number | — | — |
| max | maximum number of checkbox checked | number | — | — |
|text-color | font color when button is active | string | — | #ffffff |
|fill | border and background color when button is active | string | — | #409EFF |
### Checkbox-group Events
| Event Name | Description | Parameters |
|---------- |-------- |---------- |
| change | triggers when the binding value changes | the updated value |
### Checkbox-button Attributes
| Attribute | Description | Type | Accepted Values | Default|
|---------- |-------- |---------- |------------- |-------- |
| label | value of the checkbox when used inside a `checkbox-group` | string / number / boolean | — | — |
| true-label | value of the checkbox if it's checked | string / number | — | — |
| false-label | value of the checkbox if it's not checked | string / number | — | — |
| disabled | whether the checkbox is disabled | boolean | — | false |
| name | native 'name' attribute | string | — | — |
| checked | if the checkbox is checked | boolean | — | false |