如何在rails中提取输入ID以在javascript中使用它

Question

I'm trying to show text input field depending on checkbox checked value. Rails form helpers generate inputs with automaticly set ids. How can I refer to them in javascript.

Fragment of rails form

<%= f.check_box_without_bootstrap :standard_product%>
<%= f.label(:standard_product, "Standard product" %>
<%= f.text_field :product_comment%>

Javascript function

<script type="text/javascript">
  var checkbox = document.getElementById('????');
  var details_div = checkbox.nextSibling.nextSibling;
  checkbox.onchange = function() {
    if(this.checked) {
      details_div.style['display'] = 'block';
    } else {
      details_div.style['display'] = 'none';
    }
  };
</script>

Could you please suggest solution (that is not hard setting id for checkbox)? Thanks :-)

Answer 1

Rails check_box helper is defined as:

check_box(object_name, method, options = {}, checked_value = "1", unchecked_value = "0") public

so in your code you can pass id in the options

Answer 2

Thank you very much. I just copied generated id from inspector...

I wish to know how to point to id generated by ruby helper f.check_box in <script> tag using <%= ruby %> :-)