如何在javascript中使用ruby代码 [英] How use a ruby code inside the javascript

问题描述

我正在实现一个实时搜索，其中包含一个下拉列表，其中包含多个要过滤的字段，它仅以一个搜索字段开始，当用户单击时，下拉菜单选择要搜索的内容，并添加一个按钮以添加更多过滤条件按钮，它将生成一个新字段，如下所示:

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:

此图像示例使用JavaScript内部的html进行了硬编码.问题是我将在很多视图中使用它，因此我需要像以前使用Ruby生成第一搜索字段的代码一样，使其具有动态性.我尝试这样做，但没有成功.

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>

我什至试图在单击按钮时在JavaScript中调用搜索表单"来复制代码，但我读到这是不可能的.

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.

编辑

我按照@ppascualv的建议进行了一些更改，但单击按钮时仍无法渲染并添加另一个"search_engine".我收到一个错误消息，说未定义的方法'render'.

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

推荐答案

我能够解决我的问题.我发现您无法在资产中渲染事物，也无法在JavaScript文件中使用ruby.我做了一些解决方法，并完成了工作，我使用<script> JavaScript code </script>语法将JavaScript代码包含在 html.erb 文件中，如下所示:

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>

因为 select_tag 红宝石行生成了带有很多引号的句子，所以使用的 j 与 escape_javascript 相同，因此使用了格式化句子，以便JavaScript可以正确阅读.

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.

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