[转载]小程序开发

转载自:https://www.cnblogs.com/lovejunjuan/p/11204961.html

使用工具：

1.微信Web开发者工具

2.Visual Studio 2019

前端采用color UI，后端采用c# .net

过程中的几个重点点记录

1.color UI使用

下载colorUI以后

将icon.wxss、colorui.wxss拷贝至项目根目录

在app.wxss中导入文件

@import "icon.wxss";

@import "colorui.wxss";

 

2.图片上传功能

wxml前端代码

<view class="cu-form-group">
  <view class="picture_list">
  <view wx:for="{{upload_picture_list}}" class="picture_item" wx:key="{{index}}">
    <image wx:if="{{item.upload_percent < 100}}" src="{{item.path}}" mode="aspectFill"></image>
    <image wx:if="{{item.upload_percent == 100}}" src="{{item.path_server}}" mode="aspectFill"></image>
    <view class="upload_progress" wx:if="{{item.upload_percent < 100}}" data-index="{{index}}" bindtap="previewImg">{{item.upload_percent}}%</view>
    <text class='del' bindtap='deleteImg' data-src='{{image}}' style='display:{{isDel}}' data-index="{{index}}">×</text>
  </view>

  <view class='picture_item'>
    <view class="add-image" bindtap='uploadpic'>
      <text>+</text>
    </view>
  </view>
</view>
</view>
<view class="cu-form-group">
<button bindtap='uploadimage' class='yes-upload'>上传图片</button>
</view>

 js代码

  //选择图片方法
  uploadpic: function (e) {
    let that = this //获取上下文
    let upload_picture_list = that.data.upload_picture_list
    //选择图片
    wx.chooseImage({
      count: 8, // 默认9，这里显示一次选择相册的图片数量 
      sizeType: ['compressed'], // 可以指定是原图还是压缩图，默认二者都有  
      sourceType: ['album', 'camera'], // 可以指定来源是相册还是相机，默认二者都有
      success: function (res) { // 返回选定照片的本地文件路径列表，tempFilePath可以作为img标签的src属性显示图片 
        let tempFiles = res.tempFiles
        //把选择的图片 添加到集合里
        //console.log(tempFiles);
        for (let i in tempFiles) {
          tempFiles[i]['upload_percent'] = 0
          tempFiles[i]['path_server'] = ''
          upload_picture_list.push(tempFiles[i])
        }
        //显示
        that.setData({
          upload_picture_list: upload_picture_list,
        });
      }
    })
  },
  //点击上传图片
  uploadimage() {
    let page = this
    let upload_picture_list = page.data.upload_picture_list
    //循环把图片上传到服务器 并显示进度       
    for (let j in upload_picture_list) {
      if (upload_picture_list[j]['upload_percent'] == 0) {
        //console.log("进入上传if");
        //上传图片后端地址
        //upload_file_server('https://www.x..fds.af..a.fd.sa', page, upload_picture_list, j)
        //console.log(this.data.problemAttach);
        wx.uploadFile({
          url: this.data.domain+'api/FirstAPI/uploadPicture?problemAttach=' + this.data.problemAttach, //上传的接口地址 
          filePath: upload_picture_list[j].path,
          name: 'file',
          formData: {
            problemAttach: this.data.problemAttach,
          },
          success: function (res) {
            console.log(res);
            upload_picture_list[j]['upload_percent'] = 100
            upload_picture_list[j]['path_server'] = '接口地址' + JSON.parse(res.data).data;
            page.setData({
                upload_picture_list: upload_picture_list,
                problemAttach: JSON.parse(res.data).msg 
            });
          }
        })
      }
    }
    let imgs = wx.setStorageSync('imgs', upload_picture_list);
  },
  // 点击删除图片
  deleteImg(e) {
    let upload_picture_list = this.data.upload_picture_list;
    let index = e.currentTarget.dataset.index;
    if (upload_picture_list[index].upload_percent == 100) {
      //去服务器把对应的记录del
      this.data.delIndex = index;
      this.ajaxfunc(1);
    }
    upload_picture_list.splice(index, 1);
    this.setData({
      upload_picture_list: upload_picture_list
    });
  },
  // 预览图片
  previewImg(e) {
    //获取当前图片的下标
    let index = e.currentTarget.dataset.index;
    //所有图片
    let imgs = this.data.imgs;
    wx.previewImage({
      //当前显示图片
      current: imgs[index],
      //所有图片
      urls: imgs
    })
  },

c#后端api接口

public IHttpActionResult uploadPicture(string problemAttach)
        {
            string mesg = problemAttach;
            if (problemAttach==null||problemAttach==""||problemAttach=="undefined" || problemAttach == "null")
            {
                problemAttach = CommonHelper.GetGuid;
                mesg = problemAttach;
            }
            Repository<MK_Base_AnnexesFile> re = new Repository<MK_Base_AnnexesFile>();
            
            HttpFileCollection files = HttpContext.Current.Request.Files;
            List<string> serversrc = new List<string>();
            foreach (string key in files.AllKeys)
            {
                MK_Base_AnnexesFile fileAnnexesEntity = new MK_Base_AnnexesFile();
                HttpPostedFile file = files[key];//file.ContentLength文件长度
                string src = HttpContext.Current.Server.MapPath("~/imgcoll/") + file.FileName;
                src=src.Replace("\","/");
                if (string.IsNullOrEmpty(file.FileName) == false)
                {
                    file.SaveAs(src);
                    serversrc.Add("/imgcoll/"+file.FileName);
                }
                //str = str.Substring(0, str.LastIndexOf("/"));
                fileAnnexesEntity.F_Id = file.FileName.Substring(0, file.FileName.LastIndexOf(".")); 
                fileAnnexesEntity.F_FileName = file.FileName;
                fileAnnexesEntity.F_FilePath = src;
                fileAnnexesEntity.F_FileSize = "未知";
                fileAnnexesEntity.F_FileExtensions = file.FileName.Substring(file.FileName.LastIndexOf("."));
                fileAnnexesEntity.F_FileType = file.FileName.Substring(file.FileName.LastIndexOf(".")+1);
                fileAnnexesEntity.F_CreateUserId = "微信端上传";
                fileAnnexesEntity.F_CreateUserName = "微信端上传";
                fileAnnexesEntity.F_FolderId = problemAttach;
                re.Insert(fileAnnexesEntity);


            }

            return JsonData(true, serversrc[0], mesg);
        }