如何在控制器的动作中显示模态窗口？

So I've got controller PagesController with actions index and full_search. Action index is for home page. On home page I've got the button 'search' and text_field. If user types sometiong in text_field and clicks on button 'search' he/she goes to action full_search. In this action I try to find something by user's query. if I don't find anything I should just show a modal window with 'no results' otherwise redirect to another page

所以我有控制器PagesController与动作索引和full_search。动作索引是主页。在主页上,我有“搜索”按钮和text_field。如果用户在text_field中键入sometiong并单击“搜索”按钮,则他/她将转到操作full_search。在这个动作中,我尝试通过用户的查询找到一些东西。如果我没有找到任何东西,我应该只显示一个“没有结果”的模态窗口,否则重定向到另一个页面

def full_search
  ...do search...
  if search_result.empty?
    show modal window with text 'no results'
  else
    redirect to another page
  end
end

How can I show modal window(like function alert in js)? I think I have to use javascript..but where???

如何显示模态窗口(如js中的函数警报)?我想我必须使用javascript ..但在哪里???

if search_result is empty I don't need to render any view...I just need to stay at the same page and show modal window

如果search_result是空的我不需要渲染任何视图...我只需要保持在同一页面并显示模态窗口

2 个解决方案

#1

Step 1.

In your rendered view, have a div with id "my_modal_content" where will insert the modal's content and show the modal.

在渲染视图中,有一个id为“my_modal_content”的div,其中将插入模态的内容并显示模态。

Step 2.

Render a js.erb file which will append the modal to our page

渲染一个js.erb文件,该文件将模态附加到我们的页面

#your rails controller method
def my_method
  if something == true
    respond_to do |format|

      format.js { render :partial => 'somewhere/somefile.js.erb' }
      #I'm assuming its js request
    end
  else
    redirect to another page
  end
end

Step 4.

Write your js.erb file like this, which appends modal and then shows it.

像这样编写你的js.erb文件,它附加模态然后显示它。

#_somefile.js.erb file

$("#my_modal_content").html("<%= escape_javascript(render 'somewhere/my_modal') %>");
$("#myModal").modal('show');

Step 3.

Modal partial file _my_modal.html.erb placed within views/somewhere/ with you modal content ready.

模态部分文件_my_modal.html.erb放置在views / somewhere /中,并准备好模态内容。

<div class="modal fade" tabindex="-1" id="myModal" role="dialog">
  <div class="modal-dialog">
    ...<!-- all your content insdie -->
  </div>
</div>

Update

If you want to show an alert, its pretty straight forward. You just render js

如果你想要显示警报,它非常直接。你只是渲染js

if search_result.empty?
  message = "No result found. Try something else!"
  respond_to do |format| 
    format.js { render js: "alert(#{message});" }
  end
else
  redirect to another page
end

#2

You can save a variable with true or false in your controller: @var = true

您可以在控制器中保存带有true或false的变量:@var = true

And then in a view use javascript:

然后在视图中使用javascript:

if (<%= @var%> == true) {
  alert("some text");
}

#1