285 lines
9.5 KiB
Markdown
285 lines
9.5 KiB
Markdown
## Checkbox
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A group of options for multiple choices.
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### Basic usage
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Checkbox can be used alone to switch between two states.
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:::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.
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```html
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<template>
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<!-- `checked` should be true or false -->
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<el-checkbox v-model="checked">Option</el-checkbox>
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</template>
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<script>
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export default {
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data() {
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return {
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checked: true
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};
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}
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};
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</script>
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```
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:::
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### Disabled State
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Disabled state for checkbox.
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:::demo Set the `disabled` attribute.
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```html
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<template>
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<el-checkbox v-model="checked1" disabled>Option</el-checkbox>
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<el-checkbox v-model="checked2" disabled>Option</el-checkbox>
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</template>
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<script>
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export default {
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data() {
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return {
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checked1: false,
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checked2: true
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};
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}
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};
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</script>
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```
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:::
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### Checkbox group
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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.
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:::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.
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```html
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<template>
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<el-checkbox-group v-model="checkList">
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<el-checkbox label="Option A"></el-checkbox>
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<el-checkbox label="Option B"></el-checkbox>
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<el-checkbox label="Option C"></el-checkbox>
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<el-checkbox label="disabled" disabled></el-checkbox>
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<el-checkbox label="selected and disabled" disabled></el-checkbox>
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</el-checkbox-group>
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</template>
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<script>
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export default {
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data () {
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return {
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checkList: ['selected and disabled','Option A']
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};
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}
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};
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</script>
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```
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:::
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### Indeterminate
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The `indeterminate` property can help you to achieve a 'check all' effect.
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:::demo
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```html
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<template>
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<el-checkbox :indeterminate="isIndeterminate" v-model="checkAll" @change="handleCheckAllChange">Check all</el-checkbox>
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<div style="margin: 15px 0;"></div>
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<el-checkbox-group v-model="checkedCities" @change="handleCheckedCitiesChange">
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<el-checkbox v-for="city in cities" :label="city" :key="city">{{city}}</el-checkbox>
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</el-checkbox-group>
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</template>
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<script>
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const cityOptions = ['Shanghai', 'Beijing', 'Guangzhou', 'Shenzhen'];
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export default {
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data() {
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return {
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checkAll: false,
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checkedCities: ['Shanghai', 'Beijing'],
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cities: cityOptions,
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isIndeterminate: true
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};
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},
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methods: {
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handleCheckAllChange(val) {
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this.checkedCities = val ? cityOptions : [];
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this.isIndeterminate = false;
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},
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handleCheckedCitiesChange(value) {
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let checkedCount = value.length;
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this.checkAll = checkedCount === this.cities.length;
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this.isIndeterminate = checkedCount > 0 && checkedCount < this.cities.length;
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}
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}
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};
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</script>
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```
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:::
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### Minimum / Maximum items checked
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The `min` and `max` properties can help you to limit the number of checked items.
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:::demo
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```html
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<template>
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<el-checkbox-group
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v-model="checkedCities"
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:min="1"
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:max="2">
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<el-checkbox v-for="city in cities" :label="city" :key="city">{{city}}</el-checkbox>
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</el-checkbox-group>
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</template>
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<script>
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const cityOptions = ['Shanghai', 'Beijing', 'Guangzhou', 'Shenzhen'];
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export default {
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data() {
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return {
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checkedCities: ['Shanghai', 'Beijing'],
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cities: cityOptions
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};
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}
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};
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</script>
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```
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:::
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### Button style
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Checkbox with button styles.
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:::demo You just need to change `el-checkbox` element into `el-checkbox-button` element. We also provide `size` attribute.
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```html
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<template>
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<div>
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<el-checkbox-group v-model="checkboxGroup1">
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<el-checkbox-button v-for="city in cities" :label="city" :key="city">{{city}}</el-checkbox-button>
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</el-checkbox-group>
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</div>
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<div style="margin-top: 20px">
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<el-checkbox-group v-model="checkboxGroup2" size="medium">
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<el-checkbox-button v-for="city in cities" :label="city" :key="city">{{city}}</el-checkbox-button>
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</el-checkbox-group>
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</div>
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<div style="margin-top: 20px">
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<el-checkbox-group v-model="checkboxGroup3" size="small">
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<el-checkbox-button v-for="city in cities" :label="city" :disabled="city === 'Beijing'" :key="city">{{city}}</el-checkbox-button>
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</el-checkbox-group>
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</div>
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<div style="margin-top: 20px">
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<el-checkbox-group v-model="checkboxGroup4" size="mini" disabled>
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<el-checkbox-button v-for="city in cities" :label="city" :key="city">{{city}}</el-checkbox-button>
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</el-checkbox-group>
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</div>
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</template>
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<script>
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const cityOptions = ['Shanghai', 'Beijing', 'Guangzhou', 'Shenzhen'];
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export default {
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data () {
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return {
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checkboxGroup1: ['Shanghai'],
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checkboxGroup2: ['Shanghai'],
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checkboxGroup3: ['Shanghai'],
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checkboxGroup4: ['Shanghai'],
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cities: cityOptions
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};
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}
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}
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</script>
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```
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:::
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### With borders
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:::demo The `border` attribute adds a border to Checkboxes.
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```html
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<template>
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<div>
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<el-checkbox v-model="checked1" label="Option1" border></el-checkbox>
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<el-checkbox v-model="checked2" label="Option2" border></el-checkbox>
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</div>
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<div style="margin-top: 20px">
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<el-checkbox v-model="checked3" label="Option1" border size="medium"></el-checkbox>
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<el-checkbox v-model="checked4" label="Option2" border size="medium"></el-checkbox>
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</div>
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<div style="margin-top: 20px">
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<el-checkbox-group v-model="checkboxGroup1" size="small">
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<el-checkbox label="Option1" border></el-checkbox>
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<el-checkbox label="Option2" border disabled></el-checkbox>
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</el-checkbox-group>
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</div>
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<div style="margin-top: 20px">
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<el-checkbox-group v-model="checkboxGroup2" size="mini" disabled>
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<el-checkbox label="Option1" border></el-checkbox>
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<el-checkbox label="Option2" border></el-checkbox>
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</el-checkbox-group>
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</div>
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</template>
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<script>
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export default {
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data () {
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return {
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checked1: true,
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checked2: false,
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checked3: false,
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checked4: true,
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checkboxGroup1: [],
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checkboxGroup2: []
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};
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}
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}
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</script>
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```
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:::
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### Checkbox Attributes
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| Attribute | Description | Type | Options | Default|
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|---------- |-------- |---------- |------------- |-------- |
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| value / v-model | binding value | string / number / boolean | — | — |
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| label | value of the Checkbox when used inside a `checkbox-group` | string / number / boolean | — | — |
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| true-label | value of the Checkbox if it's checked | string / number | — | — |
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| false-label | value of the Checkbox if it's not checked | string / number | — | — |
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| disabled | whether the Checkbox is disabled | boolean | — | false |
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| border | whether to add a border around Checkbox | boolean | — | false |
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| size | size of the Checkbox, only works when `border` is true | string | medium / small / mini | — |
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| name | native 'name' attribute | string | — | — |
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| checked | if the Checkbox is checked | boolean | — | false |
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| indeterminate | same as `indeterminate` in native checkbox | boolean | — | false |
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### Checkbox Events
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| Event Name | Description | Parameters |
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|---------- |-------- |---------- |
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| change | triggers when the binding value changes | the updated value |
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### Checkbox-group Attributes
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| Attribute | Description | Type | Options | Default|
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|---------- |-------- |---------- |------------- |-------- |
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| value / v-model | binding value | array | — | — |
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|size | size of checkbox buttons or bordered checkboxes | string | medium / small / mini | — |
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| disabled | whether the nesting checkboxes are disabled | boolean | — | false |
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| min | minimum number of checkbox checked | number | — | — |
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| max | maximum number of checkbox checked | number | — | — |
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|text-color | font color when button is active | string | — | #ffffff |
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|fill | border and background color when button is active | string | — | #409EFF |
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### Checkbox-group Events
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| Event Name | Description | Parameters |
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|---------- |-------- |---------- |
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| change | triggers when the binding value changes | the updated value |
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### Checkbox-button Attributes
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| Attribute | Description | Type | Options | Default|
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|---------- |-------- |---------- |------------- |-------- |
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| label | value of the checkbox when used inside a `checkbox-group` | string / number / boolean | — | — |
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| true-label | value of the checkbox if it's checked | string / number | — | — |
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| false-label | value of the checkbox if it's not checked | string / number | — | — |
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| disabled | whether the checkbox is disabled | boolean | — | false |
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| name | native 'name' attribute | string | — | — |
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| checked | if the checkbox is checked | boolean | — | false |
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