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440 lines
12 KiB
Markdown
440 lines
12 KiB
Markdown
## Checkbox 多选框
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一组备选项中进行多选
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### 基础用法
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单独使用可以表示两种状态之间的切换，写在标签中的内容为 checkbox 按钮后的介绍。
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:::demo 在`el-checkbox`元素中定义`v-model`绑定变量，单一的`checkbox`中，默认绑定变量的值会是`Boolean`，选中为`true`。
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```html
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<template>
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<!-- `checked` 为 true 或 false -->
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<el-checkbox v-model="checked">备选项</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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<setup>
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import { defineComponent, ref } from 'vue';
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export default defineComponent({
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setup() {
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const checked = ref(true);
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return {
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checked,
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};
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},
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});
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</setup>
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-->
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```
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:::
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### 禁用状态
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多选框不可用状态。
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:::demo 设置`disabled`属性即可。
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```html
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<template>
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<el-checkbox v-model="checked1" disabled>备选项1</el-checkbox>
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<el-checkbox v-model="checked2" disabled>备选项</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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<setup>
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import { defineComponent, ref } from 'vue';
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export default defineComponent({
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setup() {
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const checked1 = ref(false);
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const checked2 = ref(true);
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return {
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checked1,
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checked2,
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};
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},
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});
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</setup>
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-->
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```
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:::
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### 多选框组
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适用于多个勾选框绑定到同一个数组的情景，通过是否勾选来表示这一组选项中选中的项。
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:::demo `checkbox-group`元素能把多个 checkbox 管理为一组，只需要在 Group 中使用`v-model`绑定`Array`类型的变量即可。 `el-checkbox` 的 `label`属性是该 checkbox 对应的值，若该标签中无内容，则该属性也充当 checkbox 按钮后的介绍。`label`与数组中的元素值相对应，如果存在指定的值则为选中状态，否则为不选中。
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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="复选框 A"></el-checkbox>
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<el-checkbox label="复选框 B"></el-checkbox>
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<el-checkbox label="复选框 C"></el-checkbox>
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<el-checkbox label="禁用" disabled></el-checkbox>
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<el-checkbox label="选中且禁用" 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: ['选中且禁用','复选框 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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<setup>
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import { defineComponent, ref } from 'vue';
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export default defineComponent({
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setup() {
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const checkList = ref(['选中且禁用', '复选框 A']);
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return {
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checkList,
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};
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},
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});
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</setup>
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-->
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```
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:::
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### indeterminate 状态
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`indeterminate` 属性用以表示 checkbox 的不确定状态，一般用于实现全选的效果
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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">全选</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 = ['上海', '北京', '广州', '深圳'];
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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: ['上海', '北京'],
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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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<setup>
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import { defineComponent, reactive, toRefs } from 'vue';
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const cityOptions = ['上海', '北京', '广州', '深圳'];
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export default defineComponent({
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setup() {
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const state = reactive({
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checkAll: false,
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checkedCities: ['上海', '北京'],
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cities: cityOptions,
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isIndeterminate: true,
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});
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const handleCheckAllChange = (val) => {
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state.checkedCities = val ? cityOptions : [];
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state.isIndeterminate = false;
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};
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const handleCheckedCitiesChange = (value) => {
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const checkedCount = value.length;
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state.checkAll = checkedCount === state.cities.length;
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state.isIndeterminate = checkedCount > 0 && checkedCount < state.cities.length;
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};
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return {
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...toRefs(state),
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handleCheckAllChange,
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handleCheckedCitiesChange,
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};
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},
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});
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</setup>
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-->
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```
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:::
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### 可选项目数量的限制
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使用 `min` 和 `max` 属性能够限制可以被勾选的项目的数量。
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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 = ['上海', '北京', '广州', '深圳'];
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export default {
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data() {
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return {
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checkedCities: ['上海', '北京'],
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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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<setup>
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import { defineComponent, reactive, toRefs } from 'vue';
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const cityOptions = ['上海', '北京', '广州', '深圳'];
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export default defineComponent({
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setup() {
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const state = reactive({
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checkedCities: ['上海', '北京'],
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cities: cityOptions,
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});
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return {
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...toRefs(state),
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};
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},
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});
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</setup>
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-->
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```
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:::
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### 按钮样式
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按钮样式的多选组合。
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:::demo 只需要把`el-checkbox`元素替换为`el-checkbox-button`元素即可。此外，Element Plus 还提供了`size`属性。
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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 === '北京'" :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 = ['上海', '北京', '广州', '深圳'];
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export default {
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data () {
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return {
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checkboxGroup1: ['上海'],
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checkboxGroup2: ['上海'],
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checkboxGroup3: ['上海'],
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checkboxGroup4: ['上海'],
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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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<setup>
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import { defineComponent, reactive, toRefs } from 'vue';
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const cityOptions = ['上海', '北京', '广州', '深圳'];
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export default defineComponent({
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setup() {
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const state = reactive({
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checkboxGroup1: ['上海'],
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checkboxGroup2: ['上海'],
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checkboxGroup3: ['上海'],
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checkboxGroup4: ['上海'],
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cities: cityOptions,
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});
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return {
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...toRefs(state),
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};
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},
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});
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</setup>
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-->
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```
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:::
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### 带有边框
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:::demo 设置`border`属性可以渲染为带有边框的多选框。
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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="备选项1" border></el-checkbox>
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<el-checkbox v-model="checked2" label="备选项2" 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="备选项1" border size="medium"></el-checkbox>
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<el-checkbox v-model="checked4" label="备选项2" 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="备选项1" border></el-checkbox>
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<el-checkbox label="备选项2" 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="备选项1" border></el-checkbox>
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<el-checkbox label="备选项2" 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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<setup>
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import { defineComponent, reactive, toRefs } from 'vue';
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export default defineComponent({
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setup() {
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const state = reactive({
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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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return {
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...toRefs(state),
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};
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},
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});
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</setup>
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-->
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```
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:::
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### Checkbox Attributes
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| 参数 | 说明 | 类型 | 可选值 | 默认值 |
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|---------- |-------- |---------- |------------- |-------- |
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| model-value / v-model | 绑定值 | string / number / boolean | — | — |
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| label | 选中状态的值（只有在`checkbox-group`或者绑定对象类型为`array`时有效）| string / number / boolean | — | — |
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| true-label | 选中时的值 | string / number | — | — |
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| false-label | 没有选中时的值 | string / number | — | — |
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| disabled | 是否禁用 | boolean | — | false |
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| border | 是否显示边框 | boolean | — | false |
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| size | Checkbox 的尺寸，仅在 border 为真时有效 | string | medium / small / mini | — |
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| name | 原生 name 属性 | string | — | — |
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| checked | 当前是否勾选 | boolean | — | false |
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| indeterminate | 设置 indeterminate 状态，只负责样式控制 | boolean | — | false |
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### Checkbox Events
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| 事件名称 | 说明 | 回调参数 |
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|---------- |-------- |---------- |
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| change | 当绑定值变化时触发的事件 | 更新后的值 |
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### Checkbox-group Attributes
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| 参数 | 说明 | 类型 | 可选值 | 默认值 |
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|---------- |-------- |---------- |------------- |-------- |
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| model-value / v-model | 绑定值 | array | — | — |
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| size | 多选框组尺寸，仅对按钮形式的 Checkbox 或带有边框的 Checkbox 有效 | string | medium / small / mini | — |
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| disabled | 是否禁用 | boolean | — | false |
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| min | 可被勾选的 checkbox 的最小数量 | number | — | — |
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| max | 可被勾选的 checkbox 的最大数量 | number | — | — |
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| text-color | 按钮形式的 Checkbox 激活时的文本颜色 | string | — | #ffffff |
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| fill | 按钮形式的 Checkbox 激活时的填充色和边框色 | string | — | #409EFF |
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### Checkbox-group Events
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| 事件名称 | 说明 | 回调参数 |
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|---------- |-------- |---------- |
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| change | 当绑定值变化时触发的事件 | 更新后的值 |
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### Checkbox-button Attributes
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| 参数 | 说明 | 类型 | 可选值 | 默认值 |
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|---------- |-------- |---------- |------------- |-------- |
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| label | 选中状态的值（只有在`checkbox-group`或者绑定对象类型为`array`时有效）| string / number / boolean | — | — |
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| true-label | 选中时的值 | string / number | — | — |
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| false-label | 没有选中时的值 | string / number | — | — |
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| disabled | 是否禁用 | boolean | — | false |
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| name | 原生 name 属性 | string | — | — |
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| checked | 当前是否勾选 | boolean | — | false |
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