小程序常用代码
时间:2019-12-20 14:02:40
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微信小程序真的是谁做谁知道,还不如用原生js
阻止事件冒泡
<view bindtap="industry">
<view catchtap="industryCatchtap">
industryCatchtap这个方法不需要写,只要标注就行
</view>
</view>
常用代码
// 取数据,data不能不写
this.data.xx
// 更新数据,普通的值,对象里的对象
this.setData({
'card.industry': str,
'industryCheckbox': arr,
'card.industryLabel': []
})
// 如果是修改动态数组
let index = e.currentTarget.dataset.index // 获取数据的索引
let temp = 'goodsList[' + index +'].num' // 获取goodsList[index].num
this.setData({
[temp]:this.data.goodsList[index].num + 1
})
// 从标签上获取data值,在标签上绑定事件
<view bindtap="play" data-xx="xx"></view>
play:function(event){
var xx= event.currentTarget.dataset.xx;
}
小程序没有下拉框
// 两个事件,两个数据
<picker mode="multiSelector"
bindcolumnchange="bindMultiPickerColumnChange"
bindchange="bindPickerChange"
value="{{industry}}"
range="{{multiArray}}">
<view>{{industry}}</view>
</picker>
小程序的复选框
我都不知道一个复选框的控制会这么难
<view class='line-row line-row_this' bindtap="industry">
<text>行业</text>
<text style="flex:1;text-align:right;">{{industry}}</text>
</view>
// 每次控制显示隐藏数据都会重新渲染
<view class='industry' wx:if="{{industryShow}}" bindtap="industry">
<view class="industryCatchtap" catchtap="industryCatchtap">
<checkbox-group bindchange="industryCheckboxChange">
<view wx:for="{{multiArray}}" wx:for-item="item">
<view class="industry1">{{item.name}}</view>
<label class="industry2" wx:for="{{item.child}}" wx:for-item="child">
<checkbox value="{{child.id}}" checked="{{multiObj[child.id].checked}}"> {{child.name}} </checkbox>
</label>
</view>
</checkbox-group>
</view>
</view>
data:{
// 接口返回值
industry: "前端,后端",
// 接口返回值
industryArr: ["aa", "dd"],
industryShow: false,
multiObj: {},
// 接口返回值
multiArray: [{
name: "it",
child: [{ name: "前端", id: "aa" }, { name: "后端", id: "bb" }],
}, {
name: "it2",
child: [{ name: "前端", id: "cc" }, { name: "后端", id: "dd" }],
}]
},
// 接口的数据处理,把内容转成带有checked
dataFilter() {
var arr = this.data.multiArray
var obj = {}
arr.map((x) => {
x.child.map((y) => {
console.log(this.data.card)
if (this.data.industryArr.indexOf(y.id) !== -1) {
obj[y.id] = Object.assign(y, { checked: true })
} else {
obj[y.id] = Object.assign(y, { checked: false })
}
})
})
this.setData({
multiObj: obj
})
},
industry() {
this.setData({
industryShow: !this.data.industryShow
})
},
industryCheckboxChange(x) {
var arr = x.detail.value;
var obj = {}
var arr2 = []
var industry = ""
for (var i in this.data.multiObj) {
if (arr.indexOf(i) !== -1) {
obj['multiObj.' + i + '.checked'] = true
arr2.push(this.data.multiObj[i].name);
} else {
obj['multiObj.' + i + '.checked'] = false
}
}
obj.industryArr = arr;
obj.industry = arr2.join(",");
this.setData(obj)
}
/*修改下默认样式,还有一种写法就是把checkbox隐藏了,通过checked的值增加class */
/*checkbox 整体大小 */
checkbox {
width: 240rpx;
height: 90rpx;
}
/*checkbox 选项框大小 */
checkbox .wx-checkbox-input {
width: 50rpx;
height: 50rpx;
}
/*checkbox选中后样式 */
checkbox .wx-checkbox-input.wx-checkbox-input-checked {
background: #FF525C;
}
/*checkbox选中后图标样式 */
checkbox .wx-checkbox-input.wx-checkbox-input-checked::before {
width: 28rpx;
height: 28rpx;
line-height: 28rpx;
text-align: center;
font-size: 22rpx;
color: #fff;
background: transparent;
transform: translate(-50%, -50%) scale(1);
-webkit-transform: translate(-50%, -50%) scale(1);
}
授权
//app.js
App({
globalData: {
userInfo: null,
unionid:null,
token:''
},
onLaunch: function () {
/* 已授权之后,自动获取用户信息 */
// 判断是否授权
wx.getSetting({
success: (res) => { //箭头函数为了处理this的指向问题
if (res.authSetting["scope.userInfo"]) {
console.log("已授权");
// 获取用户信息
wx.getUserInfo({
success: (res) => { //箭头函数为了处理this的指向问题
// this.globalData.isok=true
this.globalData.token='ok'
var that =this
console.log(res.userInfo); //用户信息结果
wx.getStorage({
key: 'unionid',
success(res) {
that.globalData.unionid=res.data
}
})
this.globalData.userInfo = res.userInfo;
if (this.userInfoReadyCallback) { //当index.js获取到了globalData就不需要回调函数了,所以回调函数需要做做一个判断,如果app.js中有和这个回调函数,那么就对这个函数进行调用,并将请求到的结果传到index.js中
this.userInfoReadyCallback(res.userInfo);
}
}
})
}
else{
console.log("未授权");
wx.removeStorage({
key: 'unionid'
})
}
}
})
}
})
table切换
<view>
<text class=" {{currentTab==0 ? 'select' : ''}}" data-current="0" bindtap="swichNav">tab1</text>
<text class=" {{currentTab==1 ? 'select' : ''}}" data-current="1" bindtap="swichNav">tab2 </text>
<text class=" {{currentTab==2 ? 'select' : ''}}" data-current="2" bindtap="swichNav">tab3 </text>
</view>
<swiper current="{{currentTab}}" bindchange="bindChange" class='swp' style="height: {{aheight?aheight+'px':'auto'}}">
<swiper-item>页面1</swiper-item>
<swiper-item>页面2</swiper-item>
<swiper-item>页面3</swiper-item>
</swiper>
Page({
data:{
currentTab: 0,
aheight: ''
},
// 滑动切换
bindChange: function (e) {
var that = this;
that.setData({
currentTab: e.detail.current
});
},
//点击tab切换
swichNav: function (e) {
var that = this;
if (this.data.currentTab === e.target.dataset.current) {
return false;
} else {
that.setData({
currentTab: e.target.dataset.current
})
}
},
// swiper 自适应高度
onLoad: function (options) {
var that = this
wx.getSystemInfo({
success: function (res) {
that.setData({
aheight: res.screenHeight
});
}
})
},
})
封装一个组件
// 先在app.json里声明组件
"pages": [
"components/Dialog/Dialog"
],
// 在组件的json里配置
{
"component": true,
"usingComponents": {}
}
// wxml
<view class='wx_dialog_container' hidden="{{!isShow}}">
<view class='wx-mask'></view>
<view class='wx-dialog'>
<view class='wx-dialog-title'>{{ title }}</view>
<view class='wx-dialog-content'>{{ content }}</view>
<view class='wx-dialog-footer'>
<view class='wx-dialog-btn' catchtap='_cancelEvent'>{{ cancelText }}</view>
</view>
</view>
</view>
// js文件
Component({
options: {
multipleSlots: true // 在组件定义时的选项中启用多slot支持
},
properties: {
// props
},
data: {
isShow: false, // 弹窗显示控制
title:"",
content:"",
cancelText:"确认"
},
methods: {
//隐藏弹框
hideDialog() {
this.setData({
isShow: !this.data.isShow
})
},
//展示弹框
showDialog(obj) {
this.setData({
isShow: !this.data.isShow,
title: obj.title || "标题",
content: obj.content || "内容"
})
},
/*
* 内部私有方法建议以下划线开头
* triggerEvent 用于触发事件
*/
_cancelEvent() {
//触发取消回调
this.triggerEvent("cancelEvent")
}
}
})
// 使用
// 在需要的page里的json里配置
{
"navigationBarTitleText": "title",
"usingComponents": {
"dialog": "/components/Dialog/Dialog"
}
}
// wxml 自定义组件标签
<dialog id='dialog' bind:cancelEvent="_cancelEvent" ></dialog>
// js
onLoad: function (options) {
//获得dialog组件
this.dialog = this.selectComponent("#dialog");
},
xx:function(){
// 调用显示,传参
this.dialog.showDialog({
title:'提示',
content:"pdt自定义"
});
},
_cancelEvent() {
// 点击取消时,隐藏
this.dialog.hideDialog();
},
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