Original author: Flower fairy Public Number: front-end female private school
The applet obtains the user location authorization process, writes less code, and does more powerful development. ”— Little fairy
Flow chart
Sometimes many parts of the project will use the logic to determine whether the user is authorized, so encapsulation is very necessary. Let's take location authorization as an example to talk about the general process.
Many applications will allow the user to authorize the geographic location as soon as they enter, and the user's latitude and longitude can be obtained by calculation to obtain the distance from the user. Below is a simple flow chart.
Development must first obtain the user's current settings and official documents through wx.getSettiing(). If you have the permission to proceed to the next step, if you do not request the user to open the permission again, if you click the user and click No, the authorization fails. If the user agrees, call wx.openSetting() to call up the client applet setting interface and return the operation result set by the user and the official document. After opening the settings page, if the user returns without opening the authorization, you will get the result of authorization failure. If you open the authorization and return to the previous page, the authorization is successful.
One thing to note here is to add the following code to app.json to obtain geographic authorization.
"permission": {
"scope.userLocation": {
"desc": "您的位置信息将用于展示您所在城市的信息"
}
}
Main code
Create a new auth.js in the utils folder for authorization operation, and then you can directly pull it in 2 lines in the code!
/**
* 微信授权
*/
const authList = {
userInfo: {
apiName: ['getUserInfo'],
authTitle: '需要使用你的用户信息',
authContent: '需要使用你的用户信息，请确认授权'
},
userLocation: {
apiName: ['getLocation', 'chooseLocation'],
authTitle: '请求授权当前位置',
authContent: '需要获取您的地理位置，请确认授权'
},
address: {
apiName: ['chooseAddress'],
authTitle: '需要使用你的通讯地址',
authContent: '需要使用你的通讯地址，请确认授权'
},
invoiceTitle: {
apiName: ['chooseInvoiceTitle'],
authTitle: '需要使用你的发票抬头',
authContent: '需要使用你的发票抬头，请确认授权'
},
invoice: {
apiName: ['chooseInvoice'],
authTitle: '需要获取你的发票',
authContent: '需要获取你的发票，请确认授权'
},
werun: {
apiName: ['getWeRunData'],
authTitle: '需要获取你的微信运动数据',
authContent: '需要获取你的微信运动数据，请确认授权'
},
writePhotosAlbum: {
apiName: ['saveImageToPhotosAlbum', 'saveVideoToPhotosAlbum'],
authTitle: '请求授权相册',
authContent: '需要使用你的相册，请确认授权'
},
}
/**
* @description: 返回值中只会出现小程序已经向用户请求过的权限
* @param {String} 权限名称
* @return {Boolean} 是有拥有权限
*/
const getWxSetting = key => {
if (typeof key === 'string' && !authList[key]) return false
return new Promise(function (resolve) {
wx.getSetting({
success: async res => {
var result = res.authSetting
// 用户拒绝过
if (result[`scope.${key}`] === false) {
// 引导去授权页
_showModal(key).then(() => {
resolve()
})
} else {
// 已授权，或者还未授权
resolve()
}
}
})
})
}
/**
* @description: 引导去授权设置页面
* @param {String} 权限名称
* @return {Boolean} 是有拥有权限
*/
const _showModal = key => {
console.log(authList[key].authContent)
return new Promise(function (resolve) {
wx.showModal({
title: authList[key].authTitle,
content: authList[key].authContent,
success: function (res) {
if (res.confirm) {
wx.openSetting({
success: async dataAu => {
// 异步，进入授权页面授权后返回判断
if (dataAu.authSetting[`scope.${key}`] === true) {
wx.showToast({
title: '授权成功',
icon: 'success',
duration: 1000
})
resolve()
} else {
wx.showToast({
title: '授权失败',
icon: 'none',
duration: 1000
})
}
}
})
// 用户点击取消
} else if (res.cancel) {
wx.showToast({
title: '授权失败',
icon: 'none',
duration: 1000
})
}
}
})
})
}
module.exports = {
getWxSetting
}
The page js introduces auth.js and calls the getWxSetting method to pass in the attribute name corresponding to the authList defined in auth.js
//index.js
//获取应用实例
const app = getApp()
const wxApi = require('../../utils/auth.js')
Page({
data: {
},
// 打开地图
openMap: function() {
wxApi.getWxSetting('userLocation').then(()=>{
// 已经授权或还未授权，下面的代码也可以根据需求提取到公共文件中
wx.getLocation({
type: 'wgs84',
success: res => {
wx.openLocation({
latitude: res.latitude,
longitude: res.longitude,
})
},
fail: err => {
wx.showToast({
title: '检查手机定位权限',
icon: 'none',
duration: 2000
})
}
})
})
},
// 保存到相册
writePhotosAlbum: function() {
wxApi.getWxSetting('writePhotosAlbum').then(()=>{
// 已经授权或还未授权，下面的代码也可以根据需求提取到公共文件中
wx.downloadFile({
url: 'https://imgs.solui.cn/avatar.png',
success: function(res) {
wx.saveImageToPhotosAlbum({
filePath: res.tempFilePath,
success: function(res) {
wx.showToast({
title: '保存成功',
icon:'none'
})
},
fail: function(err) {
wx.showToast({
title: '保存失败',
icon:'none'
})
}
})
}
})
})
},
onLoad: function () {
},
})
Then you can perform authorized operations. The wx.getLocation here can also extract public files, so I won't repeat them here.
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