How Use A Ruby Code Inside The Javascript

I am implementing a live search with a drop down containing multiple fields to filter through.It starts with only one search field, a drop down to select what to be searched for an

Solution 1:

You should take a look at Javascript with Rails, for achive your proposit you will need to create a controller that responds with your js.erb, and this action should be called from a link with data-remote=true or from ajax.

Solution 2:

You could do something like:

search_engine.html.erb

<%= form_tag(target_path, method::get) do %>
    <%= text_field_tag :query, nil, placeholder:"Search by column names...", class: "form-controlsearch-form" %>
<% end %>

live_search.js

$(document).on("change", ".search-form", function() {
    return $(this).parents("form").submit();
});

Then in your target model, you could add a search scope to make it dynamic.

target.rb

classTarget < ActiveRecord::Base
    scope :search, -> (query) {
        returnif query.blank?;
        where("target.column_name1 ILIKE :query or target.column_name2 ILIKE :query or target.column_name3 ILIKE :query", query:"%#{query}%") 
    }
end

And in your targets_controller.rb

classTargetsController < ApplicationControllerdefsearch_engine@targets = Target.search(params[:query])
    endend

Solution 3:

I was able to solve my problem. I discovered that you can't render things in assets and you can't use ruby inside a JavaScript file. I did some workaround and got it done, I included the JavaScript code inside the html.erb file using the <script> JavaScript code </script> syntax as shown here:

<scripttype="text/javascript">

  column =
  '<%= form_tag({controller: "people", action: "index"}, method: "get", remote: true) do %>' +
  '<%  valid_column_names = Person.column_names.reject{|r| r == "created_at" || r == "updated_at" || r == "slug"} %>' +
  '<%= j (select_tag :object_columns, options_for_select(valid_column_names)) %>' +
  '<%= text_field_tag :search, '', autocomplete: :off %>' +
  '<% end %>';

  $('button').on('click',function(){
    $('button').after(column);
  });

</script>

Because the select_tag ruby line generated a sentence with lots of quotation marks, the j used is the same as escape_javascript and it is used to format a sentence so the JavaScript can read it properly.