问题
In simple_form view, the submit button is like this:
<%= f.button :submit, 'Save' %>
We are trying to pass a params subaction when clicking the Save button. The params[:subaction] should have value of 'update' after clicking the button. Here is what we tried in view but it did not work:
<%= f.button :submit, 'Save', :subaction => 'update' %>
Is there a way to pass a value in params[:subaction] when clicking the Save button?
回答1:
Use name and value option.
<%= f.button :submit , name: "subaction",value: "update"%>
In your controller you will get params[:subaction] with the value "update"
回答2:
as dax points out,
<%= hidden_field_tag(:subaction, 'update') %>
<%= f.button :submit, 'Save' %>
This will provide the string value 'update' to the routed controller action via the hidden field. It can then be retrieved by the controller with
params[:subaction]
回答3:
By specifying f.button :button, type: 'submit', we can use the name and value attributes as follows to submit using a single param. Notably, the value submitted (e.g., 'cake') may be different from the button text (e.g., 'The Best Cake').
_form.html.erb
<%= f.button :button, 'The Best Cake', type: 'submit', name: 'dessert_choice', value: 'cake' %>
<%= f.button :button, 'The Best Pie', type: 'submit', name: 'dessert_choice', value: 'pie' %>
Controller
def controller_action
dessert_choice = params[:dessert_choice] # 'cake' or 'pie'
end
This approach avoids the need for hidden inputs as @dax mentioned in the comment above.
Tested on Simple Form 3.3.1 with Rails 4.2.
来源：https://stackoverflow.com/questions/17916316/is-there-a-way-to-pass-params-when-clicking-submit-button-in-simple-form-view-in