Getting Ruby Value in Jquery

how use jquery to get selected value using simple form of ruby on rails

You should do like this

= towns_select_tag(:statistic, :commune, {include_blank: true}, {class: 'form-control'}, :id => "statistic_commune")

You should get value by using:

$('#statistic_commune').val();

Give input field a value with Jquery in Ruby on Rails

The code below is not picking up the input field:

$('td.input.workload', row).val((price / 125).toFixed(2))

this rule is trying to set a value on td element that have class "input workload" like this.

<table><tr><td class="input workload">is trying to set value here</td></tr></table>

I create a fiddle with an example to set value for all input.

https://jsfiddle.net/tjecuh3m/

I hope I've helped.

How to use jquery variables in ruby?

Your expectations are completely wrong - Ruby (ERB) is executed on the server while this javascript is executed later on the client.

There is no way that you can read a javascript variable on the fly in a javascript erb template. Its just an advanced version of string interpolation, which renders javascript just the same way as it does HTML. It does not actually execute the resulting code.

A better alternative is just to use ERB to produce a template string and modify the elements with javascript.

var x = 1;
$(add_button).click(function(e){ //on add input button click
  var $template = $('<div class="sampleclass"><%= f.label :phone", class: "control-label col-md-3" %><div class="col-md-8"><%= f.text_field :phone, class: "form-control" %><a href="#" class="remove_field">Remove</a></div></div>');
  e.preventDefault();
  if(x < max_fields){ //max input box allowed
    x++;
    $template.find('label').text("phone " + x);
    $template.find('input').attr(name: "phone_" + x);
    $(wrapper).append(template); //add input box
  }
});

Getting each i element of a ruby array in a javascript function (escaping and unescaping)?

Both of these will escape js.

You can try:

var javascriptArray = <%= escape_javascript ruby_array.to_json %>

or

var javascriptArray = <%= j ruby_array.to_json %>

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