Hi, I have a form that contains two input fields used for a calculation. When either one of these fields changes values, a <div> is updated with the sum of these two fields. Right now, I am using observe_form to call an action in my controller that performs the calculation. An RJS template takes care of replacing my <div> with the new sum. However, I want to change this approach so I am not making an AJAX request to the server whenever the form is updated. I''d almost rather have a "Calculate" button that will instantly perfrom the calculation and update my <div> without a server request. What is the best way to do this? Do I need to write a custom javascript function to grab the form data and parse it? Are there Rails helpers or RJS statements that will do this? Thanks in advance for any help. Brandon -- Posted via http://www.ruby-forum.com/. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
This is untested, but from the API something like:
observe_form ''my_form'', :function =>
''recalulate()''
And define your recalculate method in a javascript file, eg application.js.
function recalculate() {
var value1 = Number($F(''field_one'')) || 0;
var value2 = Number($F(''field_two'')) || 0;
return value1 + value2;
}
You probably don''t need to observe the entire form though, you may be
able
to save some events by just observing the two fields you care about.
-Jonathan.
On 11/7/06, Brandon S.
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:>
>
> Hi,
>
> I have a form that contains two input fields used for a calculation.
> When either one of these fields changes values, a <div> is updated
with
> the sum of these two fields. Right now, I am using observe_form to call
> an action in my controller that performs the calculation. An RJS
> template takes care of replacing my <div> with the new sum.
>
> However, I want to change this approach so I am not making an AJAX
> request to the server whenever the form is updated. I''d almost
rather
> have a "Calculate" button that will instantly perfrom the
calculation
> and update my <div> without a server request. What is the best way
to
> do this? Do I need to write a custom javascript function to grab the
> form data and parse it? Are there Rails helpers or RJS statements that
> will do this?
>
> Thanks in advance for any help.
>
> Brandon
>
> --
> Posted via http://www.ruby-forum.com/.
>
> >
>
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Jonathan Viney wrote:> This is untested, but from the API something like: > > observe_form ''my_form'', :function => ''recalulate()'' > > And define your recalculate method in a javascript file, eg > application.js. > > function recalculate() { > var value1 = Number($F(''field_one'')) || 0; > var value2 = Number($F(''field_two'')) || 0; > return value1 + value2; > } > > You probably don''t need to observe the entire form though, you may be > able > to save some events by just observing the two fields you care about. > > -Jonathan.Jonathan, Thanks for your help... I was able to write the recalculate function like you said. However, once I return the sum from the function, I am having trouble displaying it on the page. I have :update => ''display_sum'' as a parameter to my observe_form function, but the display_sum <div> is not being updated with the sum. Am I doing something wrong? -- Posted via http://www.ruby-forum.com/. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
Brandon S. wrote:> Jonathan Viney wrote: > > This is untested, but from the API something like: > > > > observe_form ''my_form'', :function => ''recalulate()'' > > > > And define your recalculate method in a javascript file, eg > > application.js. > > > > function recalculate() { > > var value1 = Number($F(''field_one'')) || 0; > > var value2 = Number($F(''field_two'')) || 0; > > return value1 + value2; > > } > > > > You probably don''t need to observe the entire form though, you may be > > able > > to save some events by just observing the two fields you care about. > > > > -Jonathan. > > Jonathan, > > Thanks for your help... I was able to write the recalculate function > like you said. However, once I return the sum from the function, I am > having trouble displaying it on the page. I have :update => > ''display_sum'' as a parameter to my observe_form function, but the > display_sum <div> is not being updated with the sum. Am I doing > something wrong? > > -- > Posted via http://www.ruby-forum.com/.Your custom function needs to do the actual page modification itself, much like the RJS would have. In fact, an easy way to implement this would be to use FireBug to see the RJS response of your previous version and then just stuff the whole thing into a function with the appropriate parameters replaced.... _Kevin --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
Get rid of :update => ''display_sum'' and replace it with :function => ''recalculate()''. -Jonathan. On 11/8/06, Brandon S. <rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:> > > Jonathan Viney wrote: > > This is untested, but from the API something like: > > > > observe_form ''my_form'', :function => ''recalulate()'' > > > > And define your recalculate method in a javascript file, eg > > application.js. > > > > function recalculate() { > > var value1 = Number($F(''field_one'')) || 0; > > var value2 = Number($F(''field_two'')) || 0; > > return value1 + value2; > > } > > > > You probably don''t need to observe the entire form though, you may be > > able > > to save some events by just observing the two fields you care about. > > > > -Jonathan. > > Jonathan, > > Thanks for your help... I was able to write the recalculate function > like you said. However, once I return the sum from the function, I am > having trouble displaying it on the page. I have :update => > ''display_sum'' as a parameter to my observe_form function, but the > display_sum <div> is not being updated with the sum. Am I doing > something wrong? > > -- > Posted via http://www.ruby-forum.com/. > > > >--~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---