How to -- Popup window: Record already exists are you sure you want to upload file?

[LoveWeb2py]

Hello,

I want to create a popup window that lets the user click okay to continue uploading the file if it already exist in the database.

I created a separate table which tracks all the files uploaded in the database. I then append that to a list and check if the filename is in there.

My code looks like this:


def my_form_processing(form):
    fileUploadList = []
    fileToCheck = form.vars.blah.filename
    filesUploaded = db().select(db.myFileTracker.ALL)
    for line in filesUploaded:
      if line.file_name not in fileUploadList:
          fileUploadList.append(line.file_name)
      if fileToCheck in fileUploadList:
        btn = form.element('input',_type="submit)
        btn["_onclick"] = return confirm('File Already exists in database, are you sure you want to resubmit?');"


def processing():
   form = FORM(TABLE(TR(TD('upload file:', INPUT(_type='file', _name='blah')))
   if form.process(onvalidation=my_form_processing).accepted:
      response.flash = "Processed file without errors!"

the problem is it sets the element after the file uploads and i'm not sure how I can make it pop up before the file actually gets uploaded.

Appreciate any help!

[Niphlod]

until the user clicks on "submit", there's no way for web2py (or you) to know the name of the file being uploaded beforehand, using a normal input type="file". it's just not how the browsers work.

[Manuele Pesenti]

Il 14/07/14 21:21, Niphlod ha scritto:

> until the user clicks on "submit", there's no way for web2py (or you)
> to know the name of the file being uploaded beforehand, using a normal
> input type="file". it's just not how the browsers work.

what about to set up a javascript event on the upload like onselect and
make your check via ajax?
just a suggest
hope it could help

M.

[Austin Taylor]

That might work Manuele. How would the code look?

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[Manuele Pesenti]

Il 15/07/14 14:29, Austin Taylor ha scritto:

That might work Manuele. How would the code look?

well... for the client side I'd start from something like that: http://jsfiddle.net/dR9tH/19/ (via http://stackoverflow.com/questions/647282/is-there-an-onselect-event-or-equivalent-for-html-select)

first of all define your web service that check for filename existence and returns a json (for example) with the needed information

cheers

    M.