Rails - Jun 2007 - Submitting a form without clicking the submit button?

I''m using AJAX with 2 select pulldowns.  When you select an item in the
first pulldown, it dynamically populates the second pulldown.  However,
I need to value of the first select pulldown to know how to populate the
second pulldown.  When I select an element in the first pulldown, and
submit via clicking the submit button, it posts the value as needed and
sends in in the params hash.  I''m trying to get the selected value to
return via the params hash but to do so "onchange" instead of by
clicking the submit button.  Does anyone know how to submit a form
without having the user click the button?

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Hi Daniel,

Daniel Legrand wrote:
> I''m using AJAX with 2 select pulldowns.  When you select an item
in the
> first pulldown, it dynamically populates the second pulldown.  However,
> I need to value of the first select pulldown to know how to populate the
> second pulldown.  When I select an element in the first pulldown, and
> submit via clicking the submit button, it posts the value as needed and
> sends in in the params hash.  I''m trying to get the selected value
to
> return via the params hash but to do so "onchange" instead of by
> clicking the submit button.  Does anyone know how to submit a form
> without having the user click the button?
You don''t submit the form.  Use observe_field to submit the change to
the
first pulldown, then RJS to render the second.  There''s been quite a
bit of
discussion here about how to use observe_field with select boxes and
I''m
sure you can Google it up.

hth,
Bill 



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Thanks Bill.  I just figured it out a few minutes ago.  I wasn''t sure
if
the method I chose was appropriate, but it looks like it is.  Again,
thanks for your help!

Bill Walton wrote:
> Hi Daniel,
> 
> Daniel Legrand wrote:
> 
>> I''m using AJAX with 2 select pulldowns.  When you select an
item in the
>> first pulldown, it dynamically populates the second pulldown.  However,
>> I need to value of the first select pulldown to know how to populate
the
>> second pulldown.  When I select an element in the first pulldown, and
>> submit via clicking the submit button, it posts the value as needed and
>> sends in in the params hash.  I''m trying to get the selected
value to
>> return via the params hash but to do so "onchange" instead of
by
>> clicking the submit button.  Does anyone know how to submit a form
>> without having the user click the button?
> 
> You don''t submit the form.  Use observe_field to submit the change
to
> the
> first pulldown, then RJS to render the second.  There''s been quite
a bit
> of
> discussion here about how to use observe_field with select boxes and
I''m
> sure you can Google it up.
> 
> hth,
> Bill

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Daniel Legrand wrote:
> 
> Thanks Bill.  I just figured it out a few minutes ago.  I wasn''t
sure if
> the method I chose was appropriate, but it looks like it is.  Again,
> thanks for your help!

You''re welcome!

Bill


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