Without using a third-party control, is it possible to automatically begin uploading a file as soon as the user selects a file and the file browser window closes? I have the data struture in place as well as all the information needed to capture the data, but I need a way of knowing if the file upload has changed? Is there an event that fires, or something I can capture to achieve this?
Thanks,
George
No. Not without using a third-party control.
It looks like it is possible using a hidden <IFRAME>. Check out the AJAX File Uploader.
There are simple Silverlight and Flash solutions available as well, however.
Related
I'm developing a web (using asp.net and c#) which has a FileUpload control from asp.net. The upload thing works perfect and as far as I know I can't show progress data (%, bytes transfered, upload speed, time elapsed, time left, progress bar) using the FileUpload control from asp.net because its not asyncrhonous.
I've searched a lot (really) on the internet and I didn't find what i'm looking for and too much info has become a big confusion since I'm not sure about what I have to use.
On my web page I have a file named "UploadFile.aspx" which has a FileUpload control and a button that handles the uploading. On code-behind (UploadFile.aspx.cs) I have all the server-side logic (Upload the file into specific folder, store info about that file into a database, etc. etc) and I don't want to change this.
What I need to know is how to show the progress data to the user while is uploading the file? I can't use 3rd party applications because this is for an important commercial site. It's not a problem for me if I have to learn javascript / jQuery / Whatever but really i'm a bit lost and I don't know how to start.
Thanks for your time and your help guys.
There's some pretty cool solutions out there. Granted, you can code your own, but I'd suggest using a jQuery plugin like Plupload. If you need help setting it up, you can read their documentation.
There are lots of lots of demo code are available on the net to show the progress bar with file upload control in c#, most of them work fine on Local system but never work on the live server, Because You CAN'T USE A FileUpload control for what you want to do. When a user POSTs a file, you have to think of it like a querystring parameter. It goes as one Http Request. If you want to do a progress bar you'll want to look into something that can interact with the server asynchronously.
If you don't want to use any 3rd party that relies on Flash / Html 5, please take a look at this article:
http://vanacosmin.ro/Articles/Read/AjaxFileUpload
This is possible (and if you're using .NET 4.5 GetBufferedInputStream will make your life easier), but it is not very easy, as you'll see.
Basically, if you want a file upload with progress bar that is fully compatible with every browser, you need to handle this server side and give an url where the client (the browser) can check periodically for the progress with ajax.
What would be the best way to create a C# Web Application that allows the user to browse for an image and then display it?
An equivalent of Picturebox in windows applications, sort of
Ideally the user should be able to click on Browse, choose the picture and see it in the browser itself
Thanks
There are all ready some image-browser for asp.net including source code.
Some of them
http://www.codeproject.com/Articles/17605/Thumbnail-Image-Viewer-Control-for-ASP-NET-2-0
http://www.codeproject.com/Articles/29846/A-simple-ASP-NET-AJAX-image-browser
For this, the user needs to choose an image which will be uploaded to the server, and then rendered in the HTML or recovered using AJAX. The problem is that you can't get rid of the send/receive, and it can get slow.
You can use a FileUpload or any other component that allows to upload files directly or via AJAX (look at AjaxFileUpload AjaxControlToolkit for this).
Then you need to add an <img> to your page, through a full postback or using any other means (like jQuery.Ajax).
I don't really know how to explain what I want to do.
I will try to explain what I am doing. I built a website in ASP.NET 4 (WebForms) and I want that my brother will be able to click on a button, choose a file from his computer and it will be uploaded to my server.
I have no idea how to do it. It sounds very hard to do and I am really stuck with this for a few days now.
I don't care if it will be with JavaScript, HTML or C#, I just really need it to work.
There's an ASP.NET control made just for that, the FileUpload control. Here's a handy example.
Note that it's notoriously difficult to style if you want to apply CSS and make it elegant, but there are more advanced ways around that. Also, this won't give your web application access to the client's local files or anything like that, it's just a standard file open dialog box for the user to select a file and upload it.
I also highly recommend doing a lot of input checking when accepting files. File type, file size, etc. are all important.
you have 2 options really.. use a traditional fileupload control (from the toolbox) or use the Ajax AsyncFileupload control.
either way it will allow your brother to upload a file from his computer to your server.
I'm trying to upload some files to an ftp server from an ASP.NET page. Everything is ready however I would like to use an open file dialog to select the files I want to upload. How can I enable file upload to select multiple files, and if I can't, can I simply use the OpenFileDialog like a normal windows forms application ?
Thanks in advance
The issue is that in the context of a web application, you post data as a KeyValuePair. So a single <input type="file" name="Something" /> element can contain only one file because it is only one key.
An OpenFileDialog would be executed server side in a window there; the client would never see it.
Your options are to either limit to 1 file (and have a button to add another file upload), or move to a gmail like approach where you use a flash / plugin to get that functionality.
The standard HTML browse dialogue won't let you. However, there's a video on the official ASP.NET site called Multiple File Uploads in ASP.NET 2 that you should look at. There's some code based on that here.
Generally you would either use a Flash or JavaScript/AJAX based solution. There are plenty of controls available that can do this eg.
http://www.codeproject.com/KB/aspnet/multiple_file_upload.aspx
http://swfupload.org/
http://ajaxuploader.com/
Just google 'multiple file upload' for far more.
Set OpenFileDialog's MultiSelect property to true.
You may want to look at these SO posts:
How to select multiple files for upload?
Selecting Multiple Files for Upload in Web Page
Have a look here on how to upload multiple files. You have multiple FileUpload controls and use HttpFileCollection to get the files.
http://www.dotnetcurry.com/ShowArticle.aspx?ID=68&AspxAutoDetectCookieSupport=1
i also research on this point but there is no a way to select a multiple file at one file control beacuuse the limitation of the file controll is select only one file at the time
so you will take multiple file control for import multiple file
I am trying to create a wizard using jquery (fill in a dialog of info, press next, dialog changes but page does not refresh). During this process I would like to upload a file to a document library. I do not wish to reload the page. Is this possible? How would you go about doing this?
You can use uploadify plugin here, which uses a flash component to upload files and it provides events for almost every state of uploading, so you can fire your functions whenever you want for changing content showing alerts etc...
As redsquare says there are also other plugins, but i used this one in a project and it works pretty well.
Hope it helps,
Sinan.