Prompt in select_tag

Rails
1

How can I use select_tag to

  1. Have a prompt like “Select a Value” ( selected by default )

I tried this but did not work:

    <%= select_tag :current_course,
             options_for_select( Course.find(:all).map {|p|

[p.title,p.id]} ),
{ :prompt => “Select a Value” }
%>

  1. Generate a ‘selected’ event so that some action can be done like
    submit the form or refresh the page?

Thanks in advance

  • AJ
2

Abhishek J. wrote:

How can I use select_tag to

  1. Have a prompt like “Select a Value” ( selected by default )
    I tried this but did not work:
    <%= select_tag :current_course,
    options_for_select( Course.find(:all).map {|p|
    [p.title,p.id]} ),
    { :prompt => “Select a Value” }
    %>

I do the find in the controller and feed the options_for_select two
instance
variables: the options collection and the selected value.
e.g. select_tag(:priority, options_for_select(@courses,
@selected_course))
@courses is just an array so you just put your “Select a Value” as the
first
entry.
e.g., @courses = [[“Select a Value”, “Select a Value”]]
Then push the results of the find onto @courses.

  1. Generate a ‘selected’ event so that some action can be done like
    submit the form or refresh the page?

If I understand your question, you’ll want to use observe_field on the
select_tag. It will fire an Ajax call back to the server when the value
in
the select changes.

HTH,
Bill

3

Bill W. wrote:

Abhishek J. wrote:

How can I use select_tag to

  1. Have a prompt like “Select a Value” ( selected by default )
    I tried this but did not work:
    <%= select_tag :current_course,
    options_for_select( Course.find(:all).map {|p|
    [p.title,p.id]} ),
    { :prompt => “Select a Value” }
    %>

I do the find in the controller and feed the options_for_select two
instance
variables: the options collection and the selected value.
e.g. select_tag(:priority, options_for_select(@courses,
@selected_course))
@courses is just an array so you just put your “Select a Value” as the
first
entry.
e.g., @courses = [[“Select a Value”, “Select a Value”]]
Then push the results of the find onto @courses.

  1. Generate a ‘selected’ event so that some action can be done like
    submit the form or refresh the page?

If I understand your question, you’ll want to use observe_field on the
select_tag. It will fire an Ajax call back to the server when the value
in
the select changes.

HTH,
Bill

Hey Bill

Thanks for the help. I could get the “prompt” in my selection list. I
havent tried observe_field yet but will give that a shot. Thanks again -
AJ