I have a create-react-app application that has a page where it allows the user to select a .csv file to upload, this file has many columns, one of these columns is a path to a folder with a bunch of pictures.
I want to be able to access this folder and upload all this pictures using js on the client side, apparently all solutions involving the fs library do not work anymore as it's been removed from webpack.
Since the files are hosted in the client side, I need to be able to grab those files programmatically using the js running on the cliente browser, it needs to happen without the user interaction because that CSV file has thousands of lines (there will be thousands of paths to grabs the images from), so the user can't be manually opening the file browser and selecting a directory for each line of that csv file.
To be clear, the only user interaction allowed is the csv file upload, the rest needs to be handled automatically.
How can this be done? And if it can't be done, what would be a work around this issue?
Thank you.
Is there a file select library, similar to drop zone, that just manages the file selection process and lets me control how the files are uploaded? It seems to me, unless I have missed something - most of these libraries require you to identify a server side file that will handle the upload. Currently, my set up is such that files are sent to my server and then to S3 - which is far less efficient than sending them directly to AWS via the javascript API.
I like how dropzone lets me select files from multiple directories - adding to the list of files to upload on the fly.
I have a requirement where I want to show the file preview to the users.
There are various file types which are supported like; .pdf, .xlsx, .doc, .rar, .jpeg, .png and many more.
When user clicks on the preview it should open the file in popup where preview of the file is shown to him. User can Zoom-in, Zoom-out, Download the file. Just as you can see into gmail for attachment preview.
Please, can anyone guide me to any relevant library or helpful resource for the same.
Thanks in advance
There are two main ways you can do this.
1) Server-side: Render previews once server-side (on file upload) into jpg/png images, and store the previews on the server. This is the easiest to implement on the client side, but requires extra storage on the server.
2) Client-side: Render the previews 'live' with javascript in browser, this reduces the amount the server has to do/store, but does require the client to fully download the file in-memory before it can render the preview, which for large files could be an issue. Also, you would need javascript libraries included for likely each individual file type, since most libraries will target one specific file format.
Server-Side is probably the recommended way to go. What are you using for your web server?
You are looking at creating document viewer.
Belive me its big work as browser does not understand these formats. Browser can render images directly on canvas but it does not know how to render the other files. So, any file other than image formats, one need to save them temporarily on server and then stream on the browser and show them using the respective file viewer.
You can convert doc and xlsx files to pdf and show these files using pdf viewer (http://ngmodules.org/modules/ng-pdfviewer). There are plenty of document converters available on internet (however you will need to check the licensing terms as most of them are GPL licensed, hense can not be used in commercial projects).
If you want to save this work then go for third party server those take all paint to convert documents in html5 such as https://crocodoc.com/why-crocodoc/
You can also try using google doc viewer google doc veiwer
This question is fairly broad. I'm not going through all the steps of how to implement an attachment viewer directive, but here are some pointers you might find useful.
To allow the user to download the file, you simply put a download link somewhere. If you are hosting the attachment on Amazon S3, Google Cloud Storage or some other cloud storage service, check their documentation. If you're downloading the files from your own server, make sure to set the Content-Disposition HTTP response header to attachment; filename="ORIGINAL_FILENAME", where ORIGINAL_FILENAME is the file name you want to user to see in the save dialog that appears when they click the download link.
Now on to the viewer.
For PDF files, I'd use pdfJS. There's an angular directive for it here.
You could look at something like CloudConvert for other files, to convert ehm to a PDF, and then displaying them in pdfJS, but then you probably want to store the PDF on your server as well, in addition to the original files, which requires extra storage. You might also be able to use the Google Docs viewer, or Office 365 viewer, as described in this answer.
I generate html pages which are viewed locally. Is there a way i can use javascript to save files in a user designated folder? (like C:/dev/myapp/here)
I looked at HTML5 File API on MDN and see how to read files when a user selects them. No way to save files. I know how i can cache files by creating image tags but i like to generate a single button which will kick off a script to download a series of files (zip, gif, png, jpg). I dont suppose i can do that with javascript can i?
I dont suppose i can do that with javascript can i?
Nope, you cannot.
Is it possible to drag and drop files (not images and not links to files) from one browser window into a droppable file uploader?
I.E. I know you can drag from your desktop to the browser, but how about between browser windows or even between tabs?
My website's backend generates PDF documents, and it'd be great if they could be dragged straight into gmail attachment drop box from the icon in my backend instead of downloading them then uploading them, lol.
Just not sure how to do it or if its possible... Any ideas?
I don't think you can drag files that haven't been downloaded to the client. Files are usually stored on a server and linked to from the browser...images however are downloaded so the client machine has the file at hand to use.
Your file uploader could "on drop" do a web request for the file?