At the moment, there's a delete-confirmation checkbox that's turned on when an
SQLFORM is 'deletable'. It's a simple checkbox with class='delete', along with
this bit of code in web2py_ajax.html:
jQuery("input[type='checkbox'].delete").each(function(){jQuery(this).click(function()
{ if(this.checked) if(!confirm("{{=T('Sure you want to delete this
object?')}}")) this.checked=false; });});
It presents the user with a dialog, and if the use doesn't OK the dialog, the
box isn't checked and no delete occurs on submit.
This logic serves at least two purposes. One, it's a workaround for the problem
that having multiple submit buttons is problematical with IE. Two, it forces
the user to take three actions to delete a record: check the box, confirm the
deletion, and click submit.
I have to alternative suggestions.
One is to move the above jQuery logic into a simple 'onclick' attached to the
checkbox by SQLFORM. This gets rid of the jQuery requirement (with no loss of
functionality), but more important it allows us to have an option to
SQLFORM.__init__() to override the text associated with the confirmation. 'Sure
you want to delete this object?' is somewhat idiosyncratic English to begin
with, but the main problem is that usually we'd like to be more specific than
"this object". Depending on the record, we might say "this item" or "this item
in your cart" or "this user" or any number of things.
I see no downside to this. It's compatible, and the default action is identical
to the current mechanism.
Alternative: change the delete checkbox to a 'button' element labeled 'Delete'.
Use onclick to attach a confirmation dialog to the button. If the user
confirms, do a submit of the form, but set a hidden variable in the form to
communicate the delete action to accepts. This avoids the IE problem (there's
only one submit button).
Downsides: the UI changes a checkbox to a Delete button, and JavaScript is
required to do a delete at all.
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