今天小编给大家分享一下微信小程序怎么实现拍照打卡功能的相关知识点，内容详细，逻辑清晰，相信大部分人都还太了解这方面的知识，所以分享这篇文章给大家参考一下，希望大家阅读完这篇文章后有所收获，下面我们一起来了解一下吧。
由于拍照组件是相当于一个块，用隐藏显示的方法不太好，为了更好的用户交互，选择了在一个新的页面调用相机组件，上传图片并保存打卡数据的方式。
小程序端
签到页面wxml
<view class="signBtn" bindtap="signSubmit">
<view>{{signTime}}</view>
<view>打卡签到</view>
</view>签到页面js
onLoad: function (options) {
setInterval(function(){ showTime(_self); }, 1000);
},
//签到按钮方法
signSubmit(){
let _self = this.data;
let userInfo = this.data.ruleInfo;
let data = {
//签到需要保存的数据
}
if(this.data.signDisabled){//在打卡距离内
if(this.data.photoDisabled){//需要拍照人员
this.toPhoto(data);
return true;
}
wx.request({
url: getApp().globalData.requestPath + '/sign/saveSignRuleData',
data: data,
method:'POST',
header: {'content-type': 'application/json'},
success: function (res) {
if(res.data.success){
wx.showToast({
title: '打卡成功',
})
}else{
wx.showToast({
icon:'none',
title: res.data.msg,
})
}
}
})
}else{
wx.showToast({
icon: 'none',
title: '当前位置不允许打卡',
})
}
},
//跳转到拍照页面方法
toPhoto(data){
let signData = JSON.stringify(data);
wx.navigateTo({
url: './takePhoto?signData='+signData, //跳转到自定义的一个拍照页面
})
}
//自动获取时间，并实时显示
function showTime(obj){
var today,year,month,day,hour,second,minute;
var strTime;
var strDate;
today=new Date();
var year=today.getFullYear();
var month=today.getMonth();
var day=today.getDate();
hour = today.getHours();
minute =today.getMinutes();
second = today.getSeconds();
strDate = year+"年"+check(month)+"月"+check(day)+"日";
strTime = check(hour)+":"+check(minute)+":"+check(second);
obj.setData({
signTime : strTime
})
}拍照页面wxml
<view>
<camera class="camera" device-position='{{devicePosition}}'>
<cover-view>
<cover-image wx:if="{{havaPhoto}}" src="{{src}}"></cover-image>
</cover-view>
</camera>
<view hidden="{{havaPhoto}}" >
<button bindtap="takePhoto" class="takeButton" >拍照</button>
<button bindtap="changeCamera" class="takeButton" >转换</button>
</view>
<view hidden="{{!havaPhoto}}" >
<button bindtap="retake" class="takeButton" >重拍</button>
<button bindtap="signPhoto" class="takeButton" >打卡</button>
</view>
</view>拍照页面js
takePhoto(){//拍照按钮
let ctx = wx.createCameraContext();
let _self = this;
ctx.takePhoto({
quality: 'high',//high,normal,low
success: (res) => {
_self.setData({
src:res.tempImagePath,
havaPhoto:true
})
}
})
},
retake(){//重新拍摄
this.setData({
havaPhoto:false,
src:''
})
},
changeCamera(){//转换摄像头
if(this.data.devicePosition=='front'){
this.setData({
devicePosition:'back'
})
}else{
this.setData({
devicePosition:'front'
})
}
},
signPhoto(){//上传文件，并保存打卡数据
let _self = this;
wx.uploadFile({
url: getApp().globalData.requestPath + '/sign/saveSignPhoto',
filePath: _self.data.src,
name: 'filePath',
formData: {
'user': _self.data.signData.userId
},
success: function (res) {
let resData = JSON.parse(res.data);
let data = _self.data.signData;
data.imagePath = resData.msg;
if(res.statusCode==200 && resData.success){
wx.request({
url: getApp().globalData.requestPath + '/sign/saveSignRuleData',
data: data,
method:'POST',
header: {'content-type': 'application/json'},
success: function (result) {
if(result.data.success){
wx.showToast({
title: '打卡成功',
})
setTimeout(() => {
wx.navigateBack();
}, 2000);
}else{
wx.showToast({
icon:'none',
title: result.data.msg,
})
}
}
})
}else{
wx.showToast({
title: resData.msg,
})
setTimeout(() => {
wx.navigateBack();
}, 2000);
}
}
})
}Java后台
保存照片
@RequestMapping("/saveSignPhoto")
@ResponseBody
public AjaxResult saveSignPhoto(HttpServletRequest request, @RequestParam(value = "filePath", required = false) MultipartFile file) throws IOException {
String fileName = file.getOriginalFilename();
String path;
String type;
String trueFileName;
String basePath = "D:/file/";
String user = request.getParameter("user");
if(!file.isEmpty()) {
type = fileName.contains(".") ? fileName.substring(fileName.lastIndexOf(".") + 1, fileName.length()) : null;
if (type != null) {
if ("PNG".equals(type.toUpperCase())||"JPG".equals(type.toUpperCase())) {
// 项目在容器中实际发布运行的根路径
// String realPath = request.getSession().getServletContext().getRealPath("/");
// 自定义的文件名称
trueFileName = System.currentTimeMillis() + "_" +user + "_" + sdf.format(new Date()) + "." +type;
// 设置存放图片文件的路径
path = basePath + trueFileName;
file.transferTo(new File(path));
}else {
return AjaxResult.errorResult("文件类型错误");
}
}else {
return AjaxResult.errorResult("文件类型不存在");
}
}else {
return AjaxResult.errorResult("文件不存在");
}
return AjaxResult.successResult(trueFileName);
}保存打卡数据
@RequestMapping("/saveSignRuleData")
@ResponseBody
public AjaxResult saveSignRuleData(@RequestBody BgCard bgCard){
boolean flag = signDataService.saveSignRuleData(bgCard);
if(flag){
return AjaxResult.successResult();
}else {
return AjaxResult.errorResult("保存失败");
}
}