asp. Net using Ajax file upload plug-in to upload files (with source code)

Time:2022-4-25

ajaxFileUpload. JS many of the same name, because it’s easy to make one.

I use this:https://github.com/carlcarl/AjaxFileUpload

Download address here:http://xiazai.jb51.net/201701/yuanma/ajaxfileupload(jb51.net).rar

AjaxFileUpload. JS is not a very famous plug-in, but what others have written is put out for everyone. The principle is to create hidden forms and iframes, and then submit them with JS to obtain the return value.

I chose the asynchronous upload function because its configuration is more like jQuery’s Ajax. I like it very much.

What is said in the comments is not good. Because we don’t use the same JS. I searched GitHub for ajaxfileupload and found many similar JS.

Ajaxfileupload is a jQuery plug-in that uploads files asynchronously

Pass on a version you don’t know. You don’t have to look everywhere in the future.

Syntax:$.ajaxFileUpload([options])

Options parameter description:

  • 1. URL upload handler address.
  • 2. Fileelementid is the ID of the file field to be uploaded, i.e. < input type = “file” > ID.
  • 3. Whether secureuri enables secure submission. The default value is false.
  • 4. Datatype the data type returned by the server. Can be XML, script, JSON, HTML. If it is not filled in, jQuery will automatically judge.
  • 5. The processing function automatically executed after successful submission. The parameter data is the data returned by the server.
  • 6. Error is the processing function automatically executed when the submission fails.
  • 7. Data custom parameters. This thing is more useful. It will be used when there is data related to the uploaded pictures.
  • 8. Type when submitting custom parameters, this parameter should be set to post

Error message:

  • 1,SyntaxError: missing ; Before statement error
    If this error occurs, you need to check whether the URL path can be accessed
  • 2. Syntax error: syntax error
    If this error occurs, you need to check whether there is a syntax error in the server spooler processing the submission operation
  • 3. Syntax error: invalid property ID error
    If this error occurs, you need to check whether the text field attribute ID exists
  • 4. Syntax error: missing} in XML expression error
    If this error occurs, you need to check whether the file name is consistent or does not exist
  • 5. Other customization errors
    You can use the variable $error to print directly to check whether the parameters are correct, which is much more convenient than the invalid error prompts above.

usage method:

Step 1: first introduce jQuery and Ajax fileUpload plug-ins. Pay attention to the order. Needless to say, all plug-ins are like this.


    <script src="jquery-1.7.1.js" type="text/javascript"></script>
    <script src="ajaxfileupload.js" type="text/javascript"></script>

Step 2: HTML code:

<body>
    <p><input type="file" name="file" /></p>
    < input type = "button" value = "Upload" / >
    <p>< img ALT = "upload succeeded" SRC = "" / ></p>
</body>

Step 3: JS code

<script src="jquery-1.7.1.js" type="text/javascript"></script>
    <script src="ajaxfileupload.js" type="text/javascript"></script>
    <script type="text/javascript">
        $(function () {
            $(":button").click(function () {
                ajaxFileUpload();
            })
        })
        function ajaxFileUpload() {
            $.ajaxFileUpload
            (
                {
                    url: '/upload. Aspx ', // server side request address for file upload
                    Secureuri: false, // whether a security protocol is required. Generally, it is set to false
                    Fileelementid: 'file1', // ID of file upload domain
                    Datatype: 'JSON', // the return value type is generally set to JSON
                    Success: function (data, status) // the server responds to the processing function successfully
                    {
                        $("#img1").attr("src", data.imgurl);
                        if (typeof (data.error) != 'undefined') {
                            if (data.error != '') {
                                alert(data.error);
                            } else {
                                alert(data.msg);
                            }
                        }
                    },
                    Error: function (data, status, e) // server response failure processing function
                    {
                        alert(e);
                    }
                }
            )
            return false;
        }
    </script>

Step 4: upload the background page Aspx Code:

protected void Page_Load(object sender, EventArgs e)
        {
            HttpFileCollection files = Request.Files;
            string msg = string.Empty;
            string error = string.Empty;
            string imgurl;
            if (files.Count > 0)
            {
                files[0].SaveAs(Server.MapPath("/") + System.IO.Path.GetFileName(files[0].FileName));
                MSG = "success! The file size is:" + files [0] ContentLength;
                imgurl = "/" + files[0].FileName;
                string res = "{ error:'" + error + "', msg:'" + msg + "',imgurl:'" + imgurl + "'}";
                Response.Write(res);
                Response.End();
            }
        }

Download the complete code of this example

An example of MVC version:

Controller code


public class HomeController : Controller
    {
        public ActionResult Index()
        {
            return View();
        }

        public ActionResult Upload()
        {
            HttpFileCollection hfc = System.Web.HttpContext.Current.Request.Files;
            string imgPath = "";
            if (hfc.Count > 0)
            {
                imgPath = "/testUpload" + hfc[0].FileName;
                string PhysicalPath = Server.MapPath(imgPath);
                hfc[0].SaveAs(PhysicalPath);
            }
            return Content(imgPath);
        }
    }

Front end view, HTML and JS code. After successful upload, return the real address of the picture and bind it to the SRC address of < img >

<html>
<head>
    <script src="/jquery-1.7.1.js" type="text/javascript"></script>
    <script src="/ajaxfileupload.js" type="text/javascript"></script>
    <script type="text/javascript">
        $(function () {
            $(":button").click(function () {
                if ($("#file1").val().length > 0) {
                    ajaxFileUpload();
                }
                else {
                    Alert ("please select a picture");
                }
            })
        })
        function ajaxFileUpload() {
            $.ajaxFileUpload
            (
                {
                    URL: '/ home / upload', // server side request address for file upload
                    Secureuri: false, // generally set to false
                    Fileelementid: 'file1', // ID attribute of file upload space < input type = "file" name = "file" / >
                    Datatype: 'HTML', // the return value type is generally set to JSON
                    Success: function (data, status) // the server responds to the processing function successfully
                    {
                        alert(data);
                        $("#img1").attr("src", data);
                        if (typeof (data.error) != 'undefined') {
                            if (data.error != '') {
                                alert(data.error);
                            } else {
                                alert(data.msg);
                            }
                        }
                    },
                    Error: function (data, status, e) // server response failure processing function
                    {
                        alert(e);
                    }
                }
            )
            return false;
        }
    </script>
</head>
<body>
    <p><input type="file" name="file" /></p>
    < input type = "button" value = "Upload" / >
    <p>< img ALT = "upload succeeded" SRC = "" / ></p>
</body>
</html>

Finally, another example of uploading pictures with parameters: controller code:

public class HomeController : Controller
    {
        public ActionResult Index()
        {
            return View();
        }

        public ActionResult Upload()
        {
            NameValueCollection nvc = System.Web.HttpContext.Current.Request.Form;

            HttpFileCollection hfc = System.Web.HttpContext.Current.Request.Files;
            string imgPath = "";
            if (hfc.Count > 0)
            {
                imgPath = "/testUpload" + hfc[0].FileName;
                string PhysicalPath = Server.MapPath(imgPath);
                hfc[0].SaveAs(PhysicalPath);
            }
            //Pay attention to the second and third parameters
            return Json(new { Id = nvc.Get("Id"), name = nvc.Get("name"), imgPath1 = imgPath },"text/html", JsonRequestBehavior.AllowGet);
        }
    }

Index View Code:

<html>
<head>
    <script src="/jquery-1.7.1.js" type="text/javascript"></script>
    <script src="/ajaxfileupload.js" type="text/javascript"></script>
    <script type="text/javascript">
        $(function () {
            $(":button").click(function () {
                if ($("#file1").val().length > 0) {
                    ajaxFileUpload();
                }
                else {
                    Alert ("please select a picture");
                }
            })
        })
        function ajaxFileUpload() {
            $.ajaxFileUpload
            (
                {
                    URL: '/ home / upload', // server side request address for file upload
                    type: 'post',
                    Data: {ID: '123', name: 'Lunis'}, // this parameter is very rigorous. You can't write a quotation mark incorrectly
                    Secureuri: false, // generally set to false
                    Fileelementid: 'file1', // ID attribute of file upload space < input type = "file" name = "file" / >
                    Datatype: 'JSON', // the return value type is generally set to JSON
                    Success: function (data, status) // the server responds to the processing function successfully
                    {
                        alert(data);
                        $("#img1").attr("src", data.imgPath1);
                        Alert ("the ID you requested is" + data. ID + "" + "the name you requested is:" + data. Name ");
                        if (typeof (data.error) != 'undefined') {
                            if (data.error != '') {
                                alert(data.error);
                            } else {
                                alert(data.msg);
                            }
                        }
                    },
                    Error: function (data, status, e) // server response failure processing function
                    {
                        alert(e);
                    }
                }
            )
            return false;
        }
    </script>
</head>
<body>
    <p><input type="file" name="file" /></p>
    < input type = "button" value = "Upload" / >
    <p>< img ALT = "upload succeeded" SRC = "" / ></p>
</body>
</html>

This example displays the asynchronous upload of pictures and pops up the parameters of user-defined transmission.Download address of this instance

A problem was found during debugging today, that is, as a file field (< input type = “file” >), it must have a name attribute. If there is no name attribute, the server cannot get the picture after uploading. For example, the correct writing is < input type = “file” name = “file1” / >

The most classic mistake has finally found the reason. Object function (a, b) {return new e.fn.init (a, B, H)} has no method ‘handleerror’. This is an error reported by Google browser. It is very classic. I don’t know whether it is my version problem or a real problem. The root of this problem is found after n uploads. The answer is:The datatype parameter must be capitalized。 For example: datatype: ‘HTML’.

This is about ASP Net to upload files using the ajaxfileupload plug-in. I hope it will be helpful to your study, and I hope you can support developpaer.

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