# 二.数据输入（单/复选框）
前言 --> 单/复选框组件特点
单选框组件多个选择框点击选择只能选择一个，选择之前会先清空选择项，然后选中选择项，点击选中的会清空这个选项；复选框组件多个选择项点击选择，会直接选中选择项，点击选中的会清空这个选项
# 1.目录结构
├── checkbox
│ ├── checkbox-button.vue
│ ├── checkbox-group.vue
│ ├── checkbox.vue
│ └── index.js
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# 2.组件封装
# 2.1 checkbox
实现的功能点：
- 1.支持单独使用
- 2.支持在
checkbox-group中嵌套使用 - 3.支持在
form-item中使用
<template>
<label>
<span>
<input
v-if="group"
type="checkbox"
:disabled="disabled"
:value="label"
v-model="model"
@change="change"
/>
<input
v-else
type="checkbox"
:disabled="disabled"
:checked="currentValue"
@change="change"
/>
</span>
<slot></slot>
</label>
</template>
<script>
import Emitter from "../../emitter.js";
import { findComponentUpward } from "../../assist.js";
export default {
name: "VueCheckbox",
mixins: [Emitter],
props: {
label: {
type: [String, Number, Boolean],
},
disabled: {
type: Boolean,
default: false,
},
value: {
type: [String, Number, Boolean],
default: false,
},
trueValue: {
type: [String, Number, Boolean],
default: true,
},
falseValue: {
type: [String, Number, Boolean],
default: false,
},
},
data() {
return {
currentValue: this.value,
model: [],
group: false,
parent: null,
};
},
watch: {
value(value) {
if (value === this.trueValue || value === this.falseValue) {
this.updateMode();
} else {
throw `Value should be trueValue of falseValue`;
}
},
},
methods: {
updateModel() {
this.currentValue = this.value === this.trueValue;
},
change(event) {
if (this.disabled) {
return false;
}
const checked = event.target.checked;
this.currentValue = checked;
const value = checked ? this.trueValue : this.falseValue;
this.$emit("input", value);
if (this.group) {
this.parent.change(this.model);
} else {
this.$emit("on-change", value);
this.dispatch("VueFormItem", "on-form-change", value);
}
},
},
mounted() {
this.parent = findComponentUpward(this, "VueCheckboxGroup");
if (this.parent) {
this.group = true;
}
if (this.group) {
this.parent.updateModel(true);
} else {
this.updateModel();
}
},
};
</script>1
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# 2.2 checkbox-group
<template>
<div>
<slot></slot>
</div>
</template>
<script>
import { findComponentsDownward } from "../../assist.js"
import Emitter from "../../emitter.js"
export default {
name: "VueCheckboxGroup",
mixins: [Emitter],
props: {
value: {
type: Array,
default() {
return []
},
},
},
data() {
return {
currentValue: this.value,
childrens: [],
}
},
methods: {
updateModel(update) {
this.childrens = findComponentsDownward(this, "iCheckbox")
if (this.childrens) {
const { value } = this
this.childrens.forEach((child) => {
child.model = value
if (update) {
child.currentValue = value.indexOf(child.label) >= 0
child.group = true
}
})
}
},
change(data) {
this.currentValue = data
this.$emit("input", data)
this.$emit("on-change", data)
this.dispatch("VueFormItem", "on-form-change", data)
},
},
mounted() {
this.updateModel(true)
},
watch: {
value() {
this.updateModel(true)
},
},
}
</script>1
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# 3.使用案例
刷新
全屏/自适应
刷新
全屏/自适应
总结
通过对前端组件的分析，需要重点关注组件中易变性对组件封装的影响，它会对组件的可复用性、可扩展性产生很大影响