return javascript alert from contorler without redirection

[Yebach]

Hello

I have a button for user to export some data from db. If he does not have the right privileges (that is checked on server) I would like to return an alert (possible modal or smth) without redirection after he clicks ok

So far I have an alert but user is redirected to an empty page afterwards

This is my button in html

<div class="btn-group" style="margin-bottom: 20px; margin-top: 10px;">

   <!--      <button onclick="" class="btn btn-primary"><span class="glyphicon glyphicon-export"></span>&nbsp;&nbsp;{{ =T('Export EXCEL') }}</button> -->

       {{=A(T('iCal export'), _class='btn btn-primary', _href=URL('script','iCalDownload',  args = request.args[0]))}}

   </div>

and my controler

def iCalDownoload():

     if user has privilages:

         blah blah blah

     else:

         return SCRIPT("alert('You do not have the right privileges to download. Please contact administrator: in...@algit.si')")

[Mirek Zvolský]

If you call controller function and return something from this function, it will allways create new page (if you return string, it will be returned directly, if dictionary, it will be returned through the templating engine).

You can

1) test privileges before (when you create the page at first) and

a) immediately hide the button

--or-- b) have a hidden element <div style="display: none;">no privileges</div> and show it using javascript when user clicks

--or-- (if you don't want test privileges before, but after the click)

2) use ajax call (see ajax chapter of the book), which can return

a) script

--or-- b) innerHTML for some element

Dne čtvrtek 19. února 2015 9:15:09 UTC+1 Yebach napsal(a):

[Leonel Câmara]

This will always go to a new page because you're following a link. You need to make this an ajax call associated with the onclick of the button. Then you can simply use response.flash to use the regular alerts web2py already provides or response.js and you don't even need to return anything else.

[Vid Ogris]

on button click i am returning a file. Should it be any different with it. Also my response.flash or session.flash message is not working.Any ideas why? 

2015-02-19 12:47 GMT+01:00 Leonel Câmara <leonel...@gmail.com>:

This will always go to a new page because you're following a link. You need to make this an ajax call associated with the onclick of the button. Then you can simply use response.flash to use the regular alerts web2py already provides or response.js and you don't even need to return anything else.

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Lep pozdrav 

Vid Ogris

[Vid Ogris]

Are you suggesting using  ajax

<button onclick= "ajax('{{=URL("script","iCalDownload",  args = request.args[0])}}',[], '')" class="btn btn-primary"><span class="glyphicon glyphicon-export"></span>&nbsp;&nbsp;{{ =T('Export iCal') }}</button>

because the return from my function is

return exported_chunks_zip.getvalue()

[Leonel Câmara]

That won't work, the easiest way is to use some kind of jquery file download plugin.