How to pass parameters in controller in Ruby On Rails - ruby-on-rails

Question

I am trying to pass parameters in controller but it is not returning anything.Please help me how I can pass parameters .
Controller Code -
def print_salary_slip_monthwise
#month = params[:salary][:month]
#year = params[:salary][:year]
#company = params[:salary][:company_id]
#company_location = params[:salary][:company_location_id]
#department = params[:salary][:department_id]
#salaryslips = Salaryslip.where(month: #month,year: #year.to_s,employee_id: #salary1)
end
form.html.erb - This is my form in which I used on change event .
<div class="box">
<div class="box-header">
<h3 class="box-title">Salary Slip Department Wise</h3>
</div><!-- /.box-header -->
<div class="box-body">
<%= bootstrap_form_for(:pdf_salaries, url: { action: 'print_salary_slip_monthwise'},html: {id: 'pdf_salaries'},remote: true ) do |f| %>
<div class="row">
<div class="col-sm-2">
<label>Year</label>
<div class="field">
<%= select :salary,:year,['2015','2016','2017','2018','2019','2020','2021','2022','2023','2024','2025','2026','2027'],{label: 'Select Year',include_blank: " Select Year"},{class: 'form-control'} %>
</div>
</div>
<div class="col-sm-2">
<label>Month</label>
<div class="field">
<%= select :salary,:month, ['January','February','March','April','May','June','July','August','September','October','November','December'],{label: 'Select Month',include_blank: " Select Month"}, class: "form-control" %>
</div>
</div>
<div class="col-sm-2">
<div class="form-group required">
<div class="input-group">
<%= f.select :company_id, all_company,{include_blank: "Select Company"},{onchange:"var a={id:$(this).val(), form : 'employee'}; $.get('/employees/collect_company_location',a,function(response){});"}%>
</div>
</div>
</div>
<div class="col-sm-2">
<div class="form-group required">
<div id="company_location">
<%= render 'employees/company_location_dropdown' %>
</div>
</div>
</div>
<div class="col-sm-3">
<div class="form-group required">
<div class="input-group">
<div id="department">
<%= render 'employees/department_dropdown' %>
</div>
</div>
</div>
</div>
</div>
<div class="row">
<div class="col-sm-2">
<div class="actions">
<%= f.submit "Display Report", class: "btn btn-sm btn-primary",id: "buttonCtc" %>
</div>
</div>
</div>
<div class="ajax-progress"></div>
<div id="employee_list_pdf"></div>
</div>
</div>
<%end%>

Answer 1

You can pass parameters using form or using ajax. Once you pass a parameters to your server (controller) you can check it to your server log to see the parameters. In rails 4 you need to use Strong Parameters to save these parameters to your database.

Answer 2

Take this as an example of the Form will below field.
<%= simple_form_for #user do |f| %>
<%= f.input :username %>
<%= f.input :password %>
<%= f.button :submit %>
<% end %>
When above form will be submitted. you can see the rails server terminal for params
Parameters: {"user"=>{"username"=>"user1", "password"=>"password"}, "commit"=>"Submit"}
Access params in controller like this:
params[:user][:username] # code in controller
Hope this give you the clear understaning.