HAML中的Javascript中的Javascript

Question

I've got a question that mightve been asked before but i have trouble finding a proper description. I hope someone can help me out.

In the code below on the line where i set var price i want to add the javascript variable accu_id to find a record in my DB through rails. How do I do this in embedded rails in javascript?

 :javascript
    $('#accu').change(function() {
      var accu_id = $("#accu")[0].selectedOptions[0].value
      var price = "#{currency(Product.find_by(id: accu_id).price2)}"
      $('#price_accu').append(price)
    });

Or is there an easier way to do this?

Answer 1

You have two options.

1. You can use AJAX request to get data from database

2. You can use mapping concept like following

   var data = @processed_data // json data, which contains processed data in json format.
   var accu_id = $("#accu")[0].selectedOptions[0].value
   var price = data.accu_id;

Here the @processed_data contains data like following

@processed_data = currency_calculation

def currency_calculation
   Product.all.map { |product| [product.id, currency(product.price2) ] }.as_json 
end

Example

Assume products table have two entries then the @processed_data contain values like following

{ "1" => "20.00", "2" => "25.50" }

The above data directly assigned to js variable and accessed like

The first option is best choice and second is possible one.

: You can't use js variable inside ruby.