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.
Related
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 was trying to do something like this: http://www.element-it.com/Examples/MultiPowUpload/AdvancedHTMLinterface.html
But in my search for information I found that is not possible to perform multiple file selection with simple HTML and JavaScript (and JSP in the server side). There is a way to do this without using Flash? A third party component you could recommend?
Thanks.
Actually according to the specification, normal HTML file upload fields are supposed to be multiple-file-upload fields. Opera supported it for a bit, allowing you to ctrl-click to select multiple files from a file picker. But it almost always broke the webapp since many web frameworks didn't know about it and would fall over.
In the meantime, it usually suffices to use JavaScript to add an extra file upload field to the form when the previous one has been filled in. This can be made gracefully-degrading for non-JS UAs, whilst sprucing up the management of multiple files with script and pretty icons.
If you go with a Flash uploader, it's a good idea to back it up with a simple HTML file upload field for compatibility there too.
It is still works via flash, but the YUI Uploader component allows you to add multiple file selection with minimal knowledge of flash - the API to interact with it is purely javascript.
HTML 5 will support multiple file upload, but that is not currently well supported in a large number of browsers
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
I need an easy way to allow users to upload multiple files at once (ie I need to allow a user to upload a folder). I do not wish to put the burden of zipping on the user.
I would prefer to avoid Flash or variants if possible. I'm looking for a straight javascript / HTML solution if it is possible. Please note, this rules out the answers at: What is the best client side browser library to upload multiple files over http?.
You won't be able to do it with just HTML and Javascript. I'd recommend trying Fancy Upload, a MooTools plugin for multiple file uploads. It uses a mixture of JavaScript and Flash, but degrades gracefully. It works with all major browsers including IE6 and there is also a Flash 10 compatible release available for download (though the demo hasn't been updated yet).
Update (2012-11-26):
Multiple file uploads are possible with valums or blueimp file uploaders.
For recursive directory uploads, your best solution is using Chrome 11's new folder upload API. It also seems to work on Firefox if you use a vendor prefix.
With Firefox 42 and Edge having implemented the new directory upload proposal we'll finally able to do cross-browser directory uploads. The APIs are nasty enough that you may want to check out my wrapper, uppie.
If you're avoiding Flash (and presumably Java?) the JS/HTML-only solution still requires single-file inputs, but essentially you attach an onchange event to your input, adding a new input to the DOM whenever a file is selected.
Multiple file uploads are possible with valums or blueimp file uploaders.
For recursive directory uploads, your options are more limited:
Your best solution is using Chrome 11's new folder upload API. It also seems to work on Firefox if you use a vendor prefix.
This is also possible cross-browser with a Java applet. However the % of folks with a JRE installed has gotten pretty low these days (< 70%)
This isn't a pure js/html solution. As EndangeredMassa has pointed out, it's not possible. In fact, this idea is an IE/Windows only solution. I don't recommend it, but it can work.
So, all disclaimers aside ...
Many years and several employers ago, we used to do some client side stuff that instantiated the FileSystemObject. It would iterate through each of the files and pass them through to the server one at a time. Can't remember the details of how we did that :o(
Anyway, this usually meant that the client box would need to have to add the site to the list of trusted sites and give trusted sites a bunch of permissions that are turned off (for very good reasons). Stuff like the ability to Initialize and script ActiveX controls not marked as safe. That kind of thing.
I know that this isn't a perfect answer, but it could point you in the right direction.
FTP? And if necs, wrap in Java Applet, ActiveX or whatever you want.
If not, although you don't want flash, SWFUpload is quite cool, you may want to reconsider it as a decent option.
Here is pure JS solution using ExtJS library