The content of this article is about the implementation of custom components of mini programs (case analysis). It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.
This article will combine cases to explain the implementation of custom components.
Let’s start with the picture above 
This is the quantity component of a shopping cart. Main idea:
1. You can manually enter the specific quantity
2. The minimum and maximum values can be customized. When it is the minimum value, the "-" sign is grayed out and cannot be clicked. When it is the maximum value, the " " sign is grayed out and cannot be clicked.
3. When manually inputting numbers starting with "0", it will be automatically filtered and input will be prohibited. Only non-0 numbers can be entered.
4. When the manually entered number is greater than the maximum value, the input box loses focus and the input value is set to the maximum value by default. Or when the manually entered number is less than the minimum value, the input box loses focus and the input value is set to the minimum value by default
5. If the minimum attribute value minNum or the maximum value maxNum is set to NaN, it means that there is no input limit on the size of the minimum and maximum values
6. There is no limit to the default minimum and maximum values. You can enter
输入框数值变化最终响应的函数
showNumber: function (e) {
var num = e.detail.num
},{ "usingComponents": {
/**
* key:自定义组件的别名，在使用组件时用到。相当于Android自定义控件在xml文件中的申明的命名空间
* value: 自定义组件的全路径
*/
"component-option-num": "/component/optionNumber-component/optionNumber-component"
}
} 1. The minimum value set here is 0, and the maximum value is 20.
2. bindoptionNum: It is composed of the name of the bind "optionNum" custom component callback function. When the function callback of the custom component is called, the method bindoptionNum specified by this attribute will be responded to. And can get the incoming value
<component-option-num bindoptionNum="showNumber" minNum="0" maxNum="20"></component-option-num>
/**
* 组件的属性列表
*/
properties: { //最小值
minNum:{ type:Number,
value: NaN
},//最大值
maxNum:{ type:Number,
value:NaN
},
}, /**
* 组件的初始数据
*/
data: {
num: 0, //输入框显示的数量
disabledMin: false, //"-"是否可点击，true 不能点击
disabledMax:false //"+"是否可点击，true 不能点击
}, _add: function (e) {
let num = parseInt(this.data.num) + 1
if (this.checkIsMaxNum(num)) {
/**
* 大于最大数值，将输入框的值设置为最大值，
* 且"+"不能点击、"-"可点击
*/
num = this.data.maxNum this.data.disabledMax = true
this.data.disabledMin = false
}else { this.data.disabledMin = false
this.data.disabledMax = false
} this.setData({
num: num,
disabledMin: this.data.disabledMin,
disabledMax: this.data.disabledMax
}) //回调optionNum方法，将输入框num值传递给使用该组件的函数
this.triggerEvent('optionNum', { num: num })
}, _reduce: function (e) {
let num, disabledMin, disabledMax
num = parseInt(this.data.num) - 1
if (this.checkIsMinNum(num)) { //小于最小数
/**
* 小于最小数值，将输入框的值设置为最小值，
* 且"-"不能点击、"+"可点击
*/
num = this.data.minNum
disabledMin = true
disabledMax = false
}else{
disabledMin = false
disabledMax = false
} this.setData({
num: num,
disabledMin: disabledMin,
disabledMax: disabledMax
}) //回调optionNum方法，将输入框num值传递给使用该组件的函数
this.triggerEvent('optionNum',{num:num})
}, _input: function (e) {
let val = e.detail.value //1、先用正则校验输入的第一个数字，当手动输入“0”开头的数字时，自行过滤，禁止输入，只值输入非0数字
var num = val.replace(/^[0]+[0-9]*$/gi, "") /**
* 大于最大数值，将输入框的值设置为最大值，且"+"不能点击、"-"可点击。反之亦然
*/
if (this.checkIsMinNum(num)) { //小于最小数
this.data.disabledMin = true
this.data.disabledMax = false
} else if (this.checkIsMaxNum(num)) { //大于最大数
this.data.disabledMax = true
this.data.disabledMin = false
} else { this.data.disabledMin = false
this.data.disabledMax = false
} this.setData({
num: num,
disabledMin: this.data.disabledMin,
disabledMax:this.data.disabledMax
}) this.triggerEvent('optionNum', { num: num })
}, _blur:function(e){
let val = e.detail.value
let num = val.replace(/^[0]+[0-9]*$/gi, "")
let disabledMin, disabledMax
if (this.checkIsMinNum(num)) { //输入的数量 小于最小的数，则输入框显示最小值
num = this.data.minNum
disabledMin = true
disabledMax = false
} else if (this.checkIsMaxNum(num)) { //输入的数量 大于最大的数，则输入框显示最大值
this.data.disabledMax = true
num = this.data.maxNum
disabledMin = false
disabledMax = true
} else { //输入的数量 大于最小的数，则输入框显示输入值
disabledMin = false
disabledMax = false
} this.setData({
num: num,
disabledMin: disabledMin,
disabledMax: disabledMax
}) this.triggerEvent('optionNum', { num: num })
},// component/optionNumber-component/optionNumber-component.jsComponent({ /**
* 组件的属性列表
*/
properties: {
minNum:{
type:Number,
value: NaN
},
maxNum:{
type:Number,
value:NaN
},
}, /**
* 组件的初始数据
*/
data: {
num: 0,
disabledMin: false,
disabledMax:false
},
lifetimes:{ // 初始化数据
attached:function(){
let num, disabledMin, disabledMax
if (this.checkIsMinNum(this.data.num)) { //小于最小数
num = this.data.minNum
disabledMin = true
disabledMax = false
} else if (this.checkIsMaxNum(this.data.num)){ //大于最大数
num = this.data.maxNum
disabledMax = true
disabledMin = false
}else {
num = this.data.num
disabledMin = false
disabledMax = false
} this.setData({
num: num,
disabledMin: disabledMin,
disabledMax: disabledMax
})
},
}, /**
* 组件的方法列表
*/
methods: { // 减少数量
_reduce: function (e) {
// console.log("_reduce======", this.data.maxNum)
let num, disabledMin, disabledMax
num = parseInt(this.data.num) - 1
if (this.checkIsMinNum(num)) { //小于最小数
num = this.data.minNum
disabledMin = true
disabledMax = false
}else{
disabledMin = false
disabledMax = false
} this.setData({
num: num,
disabledMin: disabledMin,
disabledMax: disabledMax
}) // console.log("disabledMin======", this.data.disabledMin)
this.triggerEvent('optionNum',{num:num})
}, // 增加数量
_add: function (e) {
let num = parseInt(this.data.num) + 1
// console.log("_add======", this.data.maxNum)
if (this.checkIsMaxNum(num)) { //大于最大数
num = this.data.maxNum this.data.disabledMax = true
this.data.disabledMin = false
}else { this.data.disabledMin = false
this.data.disabledMax = false
} this.setData({
num: num,
disabledMin: this.data.disabledMin,
disabledMax: this.data.disabledMax
}) this.triggerEvent('optionNum', { num: num })
}, // 手动输入数量
_input: function (e) {
let val = e.detail.value var num = val.replace(/^[0]+[0-9]*$/gi, "") if (this.checkIsMinNum(num)) { //小于最小数
this.data.disabledMin = true
this.data.disabledMax = false
} else if (this.checkIsMaxNum(num)) { //大于最大数
this.data.disabledMax = true
this.data.disabledMin = false
} else { this.data.disabledMin = false
this.data.disabledMax = false
} this.setData({
num: num,
disabledMin: this.data.disabledMin,
disabledMax:this.data.disabledMax
}) this.triggerEvent('optionNum', { num: num })
}, // 失去焦点
_blur:function(e){
// console.log("_confirm======")
let val = e.detail.value
let num = val.replace(/^[0]+[0-9]*$/gi, "")
let disabledMin, disabledMax
if (this.checkIsMinNum(num)) { //输入的数量 小于最小的数，则输入框显示最小值
num = this.data.minNum
disabledMin = true
disabledMax = false
} else if (this.checkIsMaxNum(num)) { //输入的数量 大于最大的数，则输入框显示最大值
this.data.disabledMax = true
num = this.data.maxNum
disabledMin = false
disabledMax = true
} else { //输入的数量 大于最小的数，则输入框显示输入值
disabledMin = false
disabledMax = false
} this.setData({
num: num,
disabledMin: disabledMin,
disabledMax: disabledMax
}) this.triggerEvent('optionNum', { num: num })
}, // 检查是否是最大数
checkIsMaxNum: function (checkNum) {
return this.data.maxNum != "NaN" && checkNum >= this.data.maxNum
}, // 检查是否是最小数
checkIsMinNum: function (checkNum) {
return this.data.minNum != "NaN" && checkNum <= this.data.minNum
}
}
})<view class='optionView'>
<button class="item" bindtap="_reduce" disabled="{{disabledMin}}" style="border:0;background:white" plain='true'>
<image class="imgReduce" src="{{disabledMin ? '/images/icon/ic_reduce_grey.png' : '/images/icon/ic_reduce.png'}}"></image>
</button>
<view class="space">|</view>
<view class="item">
<input class="inputNum" type='number' maxlength='3' bindinput="_input" value="{{num}}" placeholder="0" confirm-type="确认" bindblur="_blur" placeholder-style="font-size:26rpx;color:#C81432"></input>
</view>
<view class="space">|</view>
<button class="item" bindtap="_add" disabled="{{disabledMax}}" style="margin-left:6rpx;border:0;background:white" plain='true'>
<image class="imgAdd" src="{{disabledMax ? '/images/icon/ic_add_grey.png' : '/images/icon/ic_add.png'}}"></image>
</button></view>.optionView{
height: 58rpx;
width: 240rpx;
display: flex;
flex-direction: row;
border: 1rpx solid #999;
border-radius: 10rpx;
justify-content: space-around;
align-items: center;
align-content: center;
background: white;
margin-right: 64rpx;}.item{ flex: 1; display: flex; align-items: center; align-content: center; justify-content: space-around;}.space{ height: 40rpx; width: 1rpx; color: #999; font-size: 30rpx;}.imgAdd{ width: 16rpx; height: 16rpx; padding-top: 14rpx; padding-bottom: 14rpx}.imgReduce{ width: 16rpx; height: 3.5rpx; padding-top: 18rpx; padding-bottom: 18rpx}.inputNum{ width: 70rpx; color: #C81432; font-size: 26rpx; text-align: center; padding-left: 10rpx; padding-right: 10rpx;}.textMax{ margin-top: 45rpx; margin-bottom: 36rpx;}{
"component": true,
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