Raven the Bard Raven the Bard - 6 months ago 15
Javascript Question

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 and a button to add more filters, when the user click the button, it generate a new field like this:enter image description here

This image sample was done hard coded with the html inside the JavaScript. The problem is that I will use it in a lot of views so I need it to be dynamic as the code I previously done with Ruby to generate the first search field. I tried doing this way, but no success was achieved.

live_search.js.erb

$(function () {

function search() {
$.get(window.location.href, { object_columns: $("select#object_columns").val(), search: $("#search").val() }, null, "script");
};

$("select#object_columns").change(search);
$("input#search").keyup(search);

$('button').on('click',function(){
column = "<%= j render 'shared/search_engine' %>";
$('#search-form').after(column);
});
});


search_engine.html.erb

<div id="search-form">
<%= form_tag do %>
<% valid_column_names = target.column_names.reject{|r| r == "created_at" || r == "updated_at" || r == "slug"} %>
<%= select_tag :object_columns, options_for_select(valid_column_names) %>
<%= text_field_tag :search, '', autocomplete: :off %>
<% end %>
<%= button_tag "+" %>
</div>


I even tried to call the "search-form" in the JavaScript to replicate the code when the button was clicked but I read that it is not possible.

EDIT

I made some changes as @ppascualv suggested, but I still can't render and add another "search_engine" when I click the button. I am getting an error saying undefined method 'render'.

live_search.js.erb

$(function () {

function search() {
$.get(window.location.href, { object_columns: $("select#object_columns").val(), search: $("#search").val() }, null, "script");
};

$("select#object_columns").change(search);
$("input#search").keyup(search);

$('button').on('click',function(){
$('button').append("<%= escape_javascript(render @search_engine) %>");
});
});


search_engine.html.erb

<div id="search-form">
<%= form_tag({controller: "house_activities", action: "index"}, method: "get", remote: true) do %>
<% valid_column_names = HouseActivity.column_names.reject{|r| r == "created_at" || r == "updated_at" || r == "slug"} %>
<%= select_tag :object_columns, options_for_select(valid_column_names) %>
<%= text_field_tag :search, '', autocomplete: :off %>
<% end %>
<%= button_tag "+" %>
</div>


house_activities_controller.rb

class HouseActivitiesController < ApplicationController
before_action :set_house_activity, only: [:show, :edit, :update, :destroy]

def index
@house_activities = HouseActivity.page(params[:page]).per(5).search_for(params[:object_columns], params[:search])
respond_to do |format|
format.js
format.html
end
end
end

Answer

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:

<script type="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.