input(type='file')上传多张照…

2018-12-24 09:05:55来源：博客园阅读 ()

以下内容为网络摘抄和实践修改所得，如有雷同，请谅解！！！！

1、首先是前端页面代码：

其中，<input type="file" id="file_input" name="filePath" multiple="multiple"/> ，需要设置multiple属性


<body>
    <table style="width:100%;">
        <tr>
            <td style="width:80%">
                <label>请选择图像文件：</label>  
                <button id="select">选择图片</button>  
                @*<button id="add">追加图片</button>*@  
                <button id="clear">清空图片</button>  
                @*<button id="submit" onclick="submitPhoto()" >上传</button>*@
            </td>
            <td style="width:20%">
                <form id="form1" method="post" enctype="multipart/form-data" style="width:95%;text-align:right;"> 
                <input type="file" id="file_input" name="filePath" multiple="multiple"/> 
                </form>
            </td>
        </tr>
    </table>
         
        <div id="append" style="width:100%;height:5px;"></div>
        
    </body>

如图：

2、写选择图片（<button id="select">选择图片</button>）和清空图片（<button id="clear">清空图片</button>）的事件，图片显示和删除的方法

  1 var input = document.getElementById("file_input");    
  2     var result;    
  3     var dataArr = []; // 储存所选图片的结果(文件名和base64数据)  
  4     var fd;  //FormData方式发送请求    
  5     var oSelect = document.getElementById("select");
  6     var oAdd = document.getElementById("add");
  7     var oSubmit = document.getElementById("submit");  
  8     var oInput = document.getElementById("file_input");
  9     var oClear = document.getElementById("clear");
 10      
 11     if(typeof FileReader==='undefined'){    
 12         alert("抱歉，你的浏览器不支持 FileReader");    
 13         input.setAttribute('disabled','disabled');    
 14     } else {
 15         input.addEventListener('change',readFile,false);    
 16     }　
 17     oSelect.onclick=function(){   
 18         oInput.value = "";
 19         //清空已选图片  
 20         $('.float').remove();  
 21         dataArr = [];   
 22         index = 0;          
 23         oInput.click();   
 24     }   
 25   
 26     oClear.onclick = function () {
 27         oInput.value = "";
 28         //清空已选图片  
 29         $('.float').remove();
 30         dataArr = [];
 31         index = 0;
 32     }
 33     
 34     function readFile() {
 35     fd = new FormData();
 36     var iLen = this.files.length;
 37     var index = 0;
 38     for (var i = 0; i < iLen; i++) {
 39         //if (!(input['value'].match(/.jpg|.gif|.png|.jpeg|.bmp/i))) {　　//判断上传文件格式  
 40         if (!this.files[i].name.match(/.jpg|.gif|.png|.jpeg|.bmp/i)) {　　//判断上传文件格式  
 41             return alert("上传的图片中含有格式不正确的图片，请重新选择!请选择.jpg|.gif|.png|.jpeg|.bmp格式的图片");
 42         }
 43         var filereader = new FileReader();
 44         filereader.index = i;
 45         fd.append(i, this.files[i]);
 46         filereader.readAsDataURL(this.files[i]);  //转成base64    
 47         filereader.fileName = this.files[i].name;
 48 
 49         filereader.onload = function (e) {
 50             var imgMsg = {
 51                 name: this.fileName,//获取文件名    
 52                 base64: this.result   //filereader.readAsDataURL方法执行完后，filereader.result里    
 53             }
 54             dataArr.push(imgMsg);
 55             result = '<div class="delete">delete</div><div class="result"><img src="' + this.result + '" alt=""/><br><span style="margin:0 auto;font-size:9px">' + imgMsg.name + '</span></div>';
 56             var div = document.createElement('div');
 57             div.innerHTML = result;
 58             div['className'] = 'float ';
 59             div['index'] = index;
 60             document.getElementsByTagName('body')[0].appendChild(div);  　　//插入dom树    
 61             //document.getElementById('append').appendChild(div);
 62             var imgpic = div.getElementsByTagName('img')[0];
 63             imgpic.onload = function () {
 64                 var nowHeight = ReSizePic(this); //设置图片大小    
 65                 this.parentNode.style.display = 'block';
 66                 var oParent = this.parentNode;
 67                 if (nowHeight) {
 68                     oParent.style.paddingTop = (oParent.offsetHeight - nowHeight) / 3 + 'px';
 69                 }
 70             }
 71 
 72 
 73             div.onclick = function () {
 74                 this.remove();                  // 在页面中删除该图片元素  
 75                 delete dataArr[this.index];  // 删除dataArr对应的数据  
 76 
 77             }
 78             index++;
 79         }
 80     }
 81 }
 82 
 83 
 84 
 85 
 86   function ReSizePic(ThisPic) {
 87     var RePicWidth = 100; //这里修改为您想显示的宽度值    
 88 
 89     var TrueWidth = ThisPic.width; //图片实际宽度    
 90     var TrueHeight = ThisPic.height; //图片实际高度    
 91 
 92     if (TrueWidth > TrueHeight) {
 93         //宽大于高    
 94         var reWidth = RePicWidth;
 95         ThisPic.width = reWidth;
 96         //垂直居中    
 97         var nowHeight = TrueHeight * (reWidth / TrueWidth);
 98         return nowHeight;  //将图片修改后的高度返回，供垂直居中用    
 99     } else {
100         //宽小于高    
101         var reHeight = RePicWidth;
102         ThisPic.height = reHeight;
103     }
104 
105 
106 
107 
108 }
109 
110 
111     function submitPhoto() {
112         SubmitPhoto("ControllerName");
113     }

如图：

　　3、提交到后台的方法

 1 function SubmitPhoto(controller) {
 2     if (!dataArr.length) {
 3         tipDialog("请选择文件", 1000, 3);
 4         return;
 5     }
 6     Loading(true, "正在提交数据...");
 7     $("#form1").ajaxSubmit({
 8         url: "/" + controller + "/SubmitPhoto",
 9         type: 'POST',
10         //data : JSON.stringify(submitArr),    
11         dataType: 'json',
12         //processData: false,   用FormData传fd时需有这两项    
13         //contentType: false,    
14         success: function (data) {
15             Loading(false);
16 
17             layer.alert(data.Message, {
18                 skin: 'layui-layer-lan'
19                 , closeBtn: 0
20                 , anim: 4 //动画类型
21                 , end: function () {
22                     var index = parent.layer.getFrameIndex(window.name); //获取窗口索引
23                     parent.layer.close(index);  // 关闭layer
24                 }
25             });
26 
27 
28         }
29 
30     })
31 }

如图：

4、后台接收前台传过来的图片数据进行处理

public ActionResult SubmitPhoto()
        {
            //如果上传文件为空则返回
            if (Request.Files.Count > 0)
            {
                //文件名
                string fileName = "";                
                string code = "";
                List<string> noCodes = new List<string>();
                for (int i = 0; i < Request.Files.Count; i++)
                {
                    fileName = Request.Files[i].FileName;

                    code = fileName.Substring(0, fileName.LastIndexOf('.'));

                    
                    User_EP_Boiler bolier = OperateContext.Current.BllContext.IUser_EP_BoilerBll.GetModel(c => c.No == code && c.DeleteMark == 0 && c.CompId == userContext.User.CompId);

                    if (bolier == null)
                    {
                        noCodes.Add(code);
                        continue;
                    }

                    string ext = Path.GetExtension(fileName).ToLower();
                    string filename = Guid.NewGuid().ToString() + ext;
                    string pathServer = "../Upload/" + userContext.Company.BranchStr + "/User_EPPhotos/" + filename;
                    bool result = false;

                    bolier.Photos = filename;

                    result = OperateContext.Current.BllContext.IUser_EP_BoilerBll.Modify(bolier);

                    if (result)
                    {
                        Request.Files[i].SaveAs(IOHelper.GetMapPath(pathServer));
                    }
                    else
                    {
                        noCodes.Add(code);
                        continue;
                    }

                }
                if (noCodes.Count <= 0)
                {
                    return Json(new MsgModel() { Message = "全部操作成功", State = 1, Code = 1 }, "text/html");
                }
                else
                {
                    string result = "【";
                    foreach (string codestr in noCodes)
                    {
                        result += codestr + ",";
                    }
                    result = result.Substring(0, result.Length - 1);
                    result += "】";
                    string message = "";
                    if (noCodes.Count == Request.Files.Count)
                    {
                        message = "图像对应的特种设备编号不存在或者操作失败";
                    }
                    else
                    {
                        message = "部分操作成功，图像对应的特种设备编号：" + result + "不存在或者操作失败";
                    }
                    return Json(new MsgModel() { Message = message, State = 1, Code = 1 }, "text/html");
                }

            }
            else
            { return Json(new MsgModel() { Message = "请上传文件", State = 0 }); }
        }