vue子组件修改父组件传递的变量
子组件不能直接修改父组件变量的值，但是可以通过调用父组件的方法来修改。
实现步骤
在父组件声明变量
c
export default {
data() {
return {
startTime:"",
......
},
......
}
}在父组件使用子组件并传递数据，修改变量
c
......
<!-- :startValue传值，@editStartValue修改父组件变量方法editStartTime -->
<date-time-picker
:startValue="startTime"
@editStartValue="editStartTime">
</date-time-picker>
......
c
export default {
......
methods: {
editStartTime(val){
this.startTime=val;
}
}
}在子组件中接收值，并调用父组件方法修改父组件的变量
c
//接收变量值
props: {
startValue: {
type: String,
default: "",
},
......
}
c
//调用父组件方法将值传给父组件
editStartValue() {
this.$emit("editStartValue", '2023-08-02 00:00:00');
},以上步骤只是逻辑步骤和部分代码，以下有完整代码：
父组件
html
<template>
<div>
<!-- 自定义时间组件 -->
<date-time-picker
:particle="particle"
:startValue="startTime"
:endValue="endTime"
@editStartValue="editStartTime"
@editEndValue="editEndTime">
</date-time-picker>
</div>
</template>
<script>
//引入子组件
import dateTimePicker from './date-time-picker.vue';
export default {
components: { dateTimePicker },
data() {
return {
//1：时间组件的时间间隔为15分钟，
//2：时间组件的时间间隔为1小时，
//3：时间组件只能选择日期，不能选择时间，
particle:"1",
startTime:"",
endTime:"",
},
methods: {
editStartTime(val){
this.startTime=val;
},
editEndTime(val){
this.endTime=val;
},
}
}
}
</script>子组件
html
<template>
<div>
<!-- 开始时间------------------------------------- -->
<el-time-select
v-model="startTime"
style="width: 135px"
:picker-options="startTimeOptions"
placeholder=""
prefix-icon="false"
@change="startTimeChange"
ref="startTime"
>
</el-time-select>
<!-- 开始日期 -->
<el-date-picker
v-model="startDate"
type="date"
ref="startDate"
placeholder=""
style="width: 135px; margin-left: -135px"
:picker-options="startDateOptions"
@change="startDateChange"
value-format="yyyy-MM-dd"
>
</el-date-picker>
<!-- 选中的开始日期和开始时间展示 -->
<div
@click="handleClickStart"
style="width: 200px; margin-left: -135px; display: inline-block"
>
<el-input
v-model="startInput"
size="small"
ref="startInput"
:placeholder="placeholderStart"
prefix-icon="el-icon-date"
>
</el-input>
</div>
<!-- 结束时间------------------------------------- -->
<el-time-select
v-model="endTime"
style="width: 135px"
:picker-options="endTimeOptions"
placeholder=""
prefix-icon="false"
@change="endTimeChange"
ref="endTime"
>
</el-time-select>
<!-- 结束日期 -->
<el-date-picker
v-model="endDate"
type="date"
ref="endDate"
placeholder=""
style="width: 135px; margin-left: -135px"
:picker-options="endDateOptions"
@change="endDateChange"
value-format="yyyy-MM-dd"
>
</el-date-picker>
<!-- 选中的结束日期和结束时间展示 -->
<div
@click="handleClickEnd"
style="width: 200px; margin-left: -135px; display: inline-block"
>
<el-input
v-model="endInput"
size="small"
ref="endInput"
:placeholder="placeholderEnd"
prefix-icon="el-icon-date"
>
</el-input>
</div>
</div>
</template>
<script>
export default {
props: {
//particle为1时间间隔15分钟，为2时间间隔1小时，为3只能选择日期不能选择时间
particle: {
type: String,
default: "",
},
startValue: {
type: String,
default: "",
},
endValue: {
type: String,
default: "",
},
placeholderStart: {
type: String,
default: "开始时间",
},
placeholderEnd: {
type: String,
default: "结束时间",
},
},
watch: {
//监听时间粒度的变化，变化时将之前选择的值清空
particle(newVal, oldVal) {
this.startInput = "";
this.endInput = "";
(this.startDate = ""),
(this.startTime = ""),
(this.endDate = ""),
(this.endTime = "");
},
},
created(){
//页面创建时判断父组件是否传入默认值（格式：yyyy-MM-dd hh:mm:ss）,传入时给日期和时间赋值
this.startDate= (this.startInput!=""&&this.startInput.length===19)?this.startInput.substring(0,11):"",
this.startTime= (this.startInput!=""&&this.startInput.length===19)?this.startInput.substring(11,16):"",
this.endDate= (this.endInput!=""&&this.endInput.length===19)?this.endInput.substring(0,11):"",
this.endTime= (this.endInput!=""&&this.endInput.length===19)?this.endInput.substring(11,16):""
},
data() {
return {
//父组件初始传默认值，将默认值赋值给展示变量
startInput:(this.startValue!=null&&this.startValue!=undefined&&this.startValue.length===19)?this.timeFormat(this.startValue,this.particle):"",
endInput:(this.endValue!=null&&this.endValue!=undefined&&this.endValue.length===19)?this.timeFormat(this.endValue,this.particle):"",
startDate: "",
startTime: "",
endDate: "",
endTime: "",
//时间配置
startTimeOptions: {
start: "00:00",
step: "01:00",
end: "23:59",
maxTime: "",
},
endTimeOptions: {
start: "00:00",
step: "01:00",
end: "23:59",
minTime: "",
},
//日期配置（开始时间大于结束时间，结束时间小于开始时间）
startDateOptions: {
disabledDate: (time) => {
if (this.endDate != "") {
var now = new Date(this.endDate + " 00:00:00");
return time.getTime() > now.getTime();
} else {
return false;
}
},
},
endDateOptions: {
disabledDate: (time) => {
if (this.startDate != "") {
var now = new Date(this.startDate + " 00:00:00");
return time.getTime() < now.getTime();
} else {
return false;
}
},
},
};
},
methods: {
//将传入的时间字符串改为对应的格式
timeFormat(val,particle) {
var str="";
if (particle === "3") {
str = val.substring(0, 13);
var date = new Date(val);
var minutes = date.getMinutes();
if (minutes / 15 === 0) {
str = str + ":00:00";
}
if (minutes / 15 === 1) {
str = str + ":15:00";
}
if (minutes / 15 === 2) {
str = str + ":30:00";
}
if (minutes / 15 === 3) {
str = str + ":45:00";
}
}
if (particle === "2") {
str = val.substring(0, 13);
str = str + ":00:00";
}
if (particle === "1") {
str = val.substring(0, 11);
str = str + "00:00:00";
}
return str;
},
//开始输入框点击事件
handleClickStart() {
if (this.startInput.length == 19) {
this.startDate = this.startInput.substring(0, 11);
} else {
this.startDate = this.startInput;
}
this.$refs.startDate.focus();
},
//结束输入框点击事件
handleClickEnd() {
if (this.endInput.length == 19) {
this.endDate = this.endInput.substring(0, 11);
} else {
this.endDate = this.endInput;
}
this.$refs.endDate.focus();
},
//选择开始日期后调出开始时间
startDateChange() {
if (this.startTime === "") {
this.startInput = this.startDate + " 00:00:00";
} else {
this.startInput = this.startDate + " " + this.startTime + ":00";
}
this.editStartValue();
if (this.particle != "3") {
if (this.particle === "1") {
this.startTimeOptions.step = "00:15";
}
if (this.particle === "2") {
this.startTimeOptions.step = "01:00";
}
if (this.endInput.includes(this.startDate) && this.endTime != "") {
this.startTimeOptions.maxTime = this.endTime;
}
this.$refs.startTime.focus();
}
},
//选择开始时间后赋值给开始输入框
startTimeChange() {
this.startInput = this.startDate + " " + this.startTime + ":00";
this.editStartValue();
},
//将值传给父组件
editStartValue() {
this.$emit("editStartValue", this.startInput);
},
//选择结束日期后调出结束时间
endDateChange() {
if (this.endTime === "") {
this.endInput = this.endDate + " 00:00:00";
} else {
this.endInput = this.endDate + " " + this.endTime + ":00";
}
this.editEndValue();
if (this.particle != "3") {
if (this.particle === "1") {
this.endTimeOptions.step = "00:15";
}
if (this.particle === "2") {
this.endTimeOptions.step = "01:00";
}
if (this.startInput.includes(this.endDate) && this.startTime != "") {
this.endTimeOptions.minTime = this.startTime;
}
this.$refs.endTime.focus();
}
},
//选择结束时间后赋值给结束输入框
endTimeChange() {
this.endInput = this.endDate + " " + this.endTime + ":00";
this.editEndValue();
},
//将值传给父组件
editEndValue() {
this.$emit("editEndValue", this.endInput);
},
},
};
</script>