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			326 lines
		
	
	
		
			10 KiB
		
	
	
	
		
			Markdown
		
	
	
			
		
		
	
	
			326 lines
		
	
	
		
			10 KiB
		
	
	
	
		
			Markdown
		
	
	
| <script>
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|   const cityOptions = ['上海', '北京', '广州', '深圳'];
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|   module.exports = {
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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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|         // checkList2: ['复选框 A'],
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|         checked: true,
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|         checked1: false,
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|         checked2: true,
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|         checked3: true,
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|         checked4: false,
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|         checked5: false,
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|         checked6: true,
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|         isValid: '可用',
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|         checkAll: false,
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|         cities: cityOptions,
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|         checkedCities: ['上海', '北京'],
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|         checkedCities1: ['上海', '北京'],
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|         isIndeterminate: true,
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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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|         checkboxGroup5: [],
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|         checkboxGroup6: []
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|       };
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|     },
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|     methods: {
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|       handleChange(ev) {
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|         console.log(ev);
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|       },
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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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| ## Checkbox 多选框
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| 一组备选项中进行多选
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| 
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| ### 基础用法
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| 
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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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| 
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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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| 
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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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| :::
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| 
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| ### 禁用状态
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| 
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| 多选框不可用状态。
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| 
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| ::: demo 设置`disabled`属性即可。
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| 
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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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| :::
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| 
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| ### 多选框组
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| 
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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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| 
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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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| 
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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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| 
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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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| :::
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| 
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| ### indeterminate 状态
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| 
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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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| 
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| :::demo
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| 
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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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| :::
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| 
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| ### 可选项目数量的限制
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| 
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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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| 
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| :::demo
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| 
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| ```html
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| <template>
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|   <el-checkbox-group 
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|     v-model="checkedCities1"
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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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|         checkedCities1: ['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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| 
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| :::
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| 
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| ### 按钮样式
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| 
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| 按钮样式的多选组合。
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| 
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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 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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| :::
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| 
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| ### 带有边框
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| 
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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="checked3" label="备选项1" border></el-checkbox>
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|     <el-checkbox v-model="checked4" 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="checked5" label="备选项1" border size="medium"></el-checkbox>
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|     <el-checkbox v-model="checked6" 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="checkboxGroup5" 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="checkboxGroup6" 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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| 
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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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|         checked3: true,
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|         checked4: false,
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|         checked5: false,
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|         checked6: true,
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|         checkboxGroup5: [],
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|         checkboxGroup6: []
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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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| 
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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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| | 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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| 
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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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| 
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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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| | 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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| 
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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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| 
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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   |
 |