通過將 javascript 變量傳遞給 ruby 方法，將 ruby 數組迭代到 javascript 數組

Question

我想在 javascript 代碼中迭代 ruby 數組。 如何將i變量傳遞給labels_json數組？

var offer_categories_names = <%= raw(offer_categories_names) %>;
var offer_sub_categories_list=new Array(offer_categories_names.length-1);
for (var i = 0; i < offer_categories_names.length; i++) {
  //console.log(offer_categories_names[i] + i);
  if (offer_categories_names[i] == parent_dropdown_value) {
    //iterator i instead of 0...9
    child_options_array = <%= raw(labels_json[0]) %>;
  }
}

Answer 1

您不能將 javascript 變量傳遞給 ruby 代碼。 要解決此問題，請循環通過 ruby 數組而不是 javascript 數組：

<% offer_categories_names.each_with_index do |offer_categories_name, i| %>
  if ('<%= offer_categories_name %>' == parent_dropdown_value) {
    child_options_array = <%= raw labels_json[i].to_json %>;
  }
<% end %>