Run ruby function from HTML form

Question

I have created an HTML form and when I click a button I want to call a ruby function. The HTML form has a text field and and dropdown menu and their values should be given as input parameters to the ruby function.

The ruby function is the following:

  def price(amount, item)
    # code here
  end

I tried to do something like this, but it is obviously wrong:

  fileHtml.puts " <script>
                  function calculatePrice(){
                    document.getElementById('price').value = <% object = MyClass.new %>
                                                                 <%= object.amount(document.getElementById('amount').value, document.form.menu.options[document.form.menu.selectedIndex].value) %>
                                           }

                  </script>"

How could I pass the value of the text field to the "amount" and the value of the dropdown menu to the "item" parameter of the ruby function?

Felix · Accepted Answer · 2015-09-14 12:29:09Z

2

There is too many solutions, but one i reccomend you to look into is sinatra (http://www.sinatrarb.com/), which is a web-microframework.

Then you will use it to:

serve the HTML to a webbrowser when the webbrowser visits the sinatra application ("server")
On button click (form submission), the webbrowser will talk back to the sinatra ('look, Galil entered 5 in the amount field') app which can do whatever it wants to with that data.

Good luck.

edited Sep 14, 2015 at 12:29

answered Sep 11, 2015 at 5:31

Felix

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Comments

Jerome Anthony · Accepted Answer · 2015-09-11 01:34:25Z

0

Ruby is a server side language. HTML is client side. In this context Javascript is also client side. You cannot call a server side function from your client code. Think of the browser. It doesn't understand Ruby. So it cannot execute Ruby functions.

You have to expose your ruby function as a web service or a rpc function and call it from your client via ajax.

answered Sep 11, 2015 at 1:34

Jerome Anthony

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