You may want to show only the allowed types of images to browse from when a user is uploading a profile picture. In the code above, the file browser will allow only the files with the extension jpg and png.
Note, in this case, the file browser automatically sets the file selection type as custom instead of all. However, you can always change it back to all files, if required. You may want to show the file content after a successful upload of it. For profile pictures, it will be confusing if we do not show the uploaded picture to the user immediately after upload. We can use the FileReader object to convert the file to a binary string.
Then add a load event listener to get the binary string on successful file upload. As we have seen, we can read the size metadata of a file, we can actually use it for a file size validation. You may allow users to upload an image file up to 1MB. Let us see how to achieve that.
The better usability is to let your users know about a file upload progress. We are now aware of the FileReader and the event to read and load the file. The FileReader has another event called, progress to know how much has been loaded. We can use HTML5's progress tag to create a progress bar with this information.
How about you try uploading a bigger file and see the progress bar working in the CodePen below? Give it a try. Can we upload an entire directory? Well, it is possible but with some limitations.
There is a non-standard attribute at least, while writing this article called, webkitdirectory that allows us to upload an entire directory. Though originally implemented only for WebKit-based browsers, webkitdirectory is also usable in Microsoft Edge as well as Firefox 50 and later. However, even though it has relatively broad support, it is still not standard and should not be used unless you have no alternative.
Once the user clicks the Upload button, the uploading takes place. One important point to note here. The FileList array will have information about all the files in the uploaded directory as a flat structure. But the key is, for each of the File objects, the webkitRelativePath attribute will have the directory path.
Js and FileUploader. Js and add the following code. JS and define the controller in that file as in the following. Now our objective is, after selecting the file, it will automatically read the file and show the file size in the page.
For this purpose, we called the onchange event of the file upload control and written the following code. Now our next objective is to upload the file using the Web API so that this specific file can be copied and saved in a specific location. For this, we already created a button name Upload.
We need to click on this button for uploading. When we click this button, it will call an AngularJs function that internally redirects to the Web API controller to copy and save the file into a specific location.
Here I am using Temporary Internet Files folder for the location. Now write the following code first into the fileupload. And the uploadComplete function checks if the Web API returns a status code in other words success or not. Now for the Web API code. For that, we will add a controller file within the controller folder named FileUploaderController and write the following code in that file.
Generic; using System. IO; using System. Linq; using System. Net; using System. Http; using System. Headers; using System.
Web; using System. Http; namespace FileUploader. Request; if httpRequest. GetFullPath Path. Combine Environment. That would be a huge security flaw. Add a comment. Active Oldest Votes. Improve this answer. Jon Winstanley Calum Calum 4, 1 1 gold badge 21 21 silver badges 27 27 bronze badges. Darren Darren 6 6 silver badges 9 9 bronze badges. There is no need to echo other comments.
The answer was already edited to contain this. Dane Dane 8, 5 5 gold badges 31 31 silver badges 51 51 bronze badges. It isn't fine. As Calum pointed out 4 years ago, it is missing the enctype attribute. Sign up or log in Sign up using Google. Sign up using Facebook.
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