I need to calculate file size using javascript before the file starts to upload in server size. I need do the file size operation in client size itself.
Pls help me guys.,
Thanks..
New APIs in HTML5 will allow you to interact with files - so you need the users to be on latest browsers for this to work:
jquery File Upload
HTML5 will helpful for you.
check the similar question on stackoverflow
check this also
Related
I am willing to programmatically generate file previews for a large set of Adobe files. This should be done programmatically (not via user interface via recorded actions).
The idea is to generate jpg/png previews for psd files, pdf preview for indd files and so on.
Is there a library or SDK to easily do that?
I am open to every programming language that can get the job done, however I prefer a js solution since I am willing to run the script on a nodeJS server.
Is there any system requirement or program to be installed to make this thing work? Do I need an Adobe subscription to do that?
Thank you in advance.
I cannot find yet a proper solution in JavaScript. But this is a reference link I found on search engines.
https://unix.stackexchange.com/questions/11835/pdf-to-jpg-without-quality-loss-gscan2pdf
With ImageMagick on a server, it may help solve the problem.
Another reference link is on about to improve the speed and reduce the memory consumption. This may also help you integrate it on your server.
https://serverfault.com/questions/167573/fast-pdf-to-jpg-conversion-on-linux-wanted
This code snippet may help you. You may have to apply back-ends on your server instead of directly integrating it in your NodeJS server.
convert -density 300 file.pdf page.jpg
Hi I wanna do a simple validation of file upload through javascript how do i do that?
I want to check the extension and the file size as well.
If you want to do a file validation through JavaScript you need the FileAPI functions to be available in your browser which will leave your browser support to only the newest ones.
If that is what you want, here is a quick tutorial to get you started.
I have a script already for uploading pictures, but I want the ability to select more pictures at once on upload,by holding down ctrl,I know I can use uploadify but I don't want to start over, mabe you guys know a script or something for jquery, that will work without to remove the current code, or you guys could give me a snippet.
The ability to slect multiple files in entirely the browsers features. Which cannot be changed by using a Javascript or css or html. Using uploadify or similar as you mentioned in your question is the right way to go.
You know uploadify also uses the swfobject.js, to overcome this limitation by using an actionscript instead.
You could write your own upload system in javascript with ajax. See http://www.html5rocks.com/en/tutorials/file/dndfiles/
Basic workflow
get local file contents
push to server via ajax
With this you could do a multi-file select and/or drag and drop upload system. Best and maybe only solution if you want to stay in javascript.
I want to make some file operation using Javascript or jQuery like:
File create
File write
File read
Update
Remove/delete
Is it possible to do above stuffs? If possible, from where I can get the idea? Please suggest me.In any end (client/server) how can it be done?i asked this just for know!
There are 2 HTML5 APIs of interest.
The File API which allows you to read files (of a users choice). Most modern browsers implement this.
The File Write API which allows you to write to files. No browsers implement this as of now.
I presume you can also use IE only ActiveX controls to do file manipulation on windows.
In any end (client/server)
You weren't specific about which server side JS implementation you are using, so for Node.js:
See the file system section of the Node.js documentation
As I can understand from your question you are trying to do file operation at client end. If you are using IE and windows operating system, you can do that using FileSystemObject. This doesn't work for other browser and other operating systems as FileSystemObject is ActivexObject given by Windows. For details refer http://www.codeproject.com/KB/scripting/JavaScript__File_Handling.aspx
I need to make new own file upload field using HTML and Javascript since Built-In file upload not showing full path of the file
I need to make it similar to file upload by using button and textbox
please help to solve this problem
You can't.
There are security considerations browsers must adhere to and there is now way around that.
FYI this is also why Firefox doesn't allow drag and drop into a file field.
Just fyi, I think the path display depends on your browser.
If you're willing to/can do so, java (not javascript) might be able to help you with your original problem. Java brings it's own problems, though.
The file upload is a specific input type, which you can't easily replace, but in some browsers you may be able to style it.
You should be able to access the filename from javascript, and display this in a different part of the page (possibly hiding the file input at the same time) so the user can see what will be selected.
Another option is to use Flash for a fancier front-end (see http://www.flickr.com/photos/upload/ (assuming you have a flickr account) as an example), but I've never used one of these as a developer