ruby-on-rails - 深度嵌套的 content_tag、concat 和 rails 3

Question

我对使用 Rails 3.2 并为 Bootstrap modals 制作助手感到沮丧。我不明白何时需要 concat 与何时不需要 concat 有时我最终会丢失标签，有时我会得到一个哈希，其中包含之前和结束标签之间的所有选项。当我在任何带有 do-end 的内容标签上使用 concat 时，一切都变得困惑了。我想做的就是复制这个html:

<div id="stupid_modal" class="modal hide fade" tabindex="-1" data-width="760">
    <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal" aria-hidden="true"><i class="fontello-icon-cancel-1"></i></button>
        <h4>Modal header</h4>
    </div>
    <div class="modal-body">
        <div class="page-header">
            <p>Test header 1 2 3.</p>
        </div>
        <div class="row-fluid">

           content here... blah blah

        </div>
    </div>
    <div class="modal-footer">
        <button type="button" data-dismiss="modal" class="btn">Close</button>
        <button type="button" class="btn btn-green">Save changes</button>
    </div>
</div>

我一辈子都无法让模态标题中的 h4 中的按钮正常工作。我也不能让页眉出现在模态正文中。

我的助手看起来像这样:

module ModalHelper
def modal(css_id, header_text, hidden = true, options = {},&block)
    class_text = "modal"
    class_text += " hide fade" if hidden
    content_tag(:div, :class => 'modal hide fade', :id => css_id, :style => ("display:none;" if hidden)) do 
        concat modal_header(header_text)
        concat modal_body(&block)
        concat modal_footer
    end
end

def modal_button(link_text, href)
    modal_caller link_text, href, :button
end

def modal_link(link_text, href)
    modal_caller link_text, href
end

private

def modal_caller(link_text, href, type = nil)
    options = { :"data-toggle" => "modal" }
    options.merge!({ :class => "btn" }) if type == :button
    link_to link_text, "#" + href, options
end

def modal_header(header_text)
    content_tag(:div, :class => 'modal-header') do
        concat content_tag(:button,(content_tag(:i, :class => 'fontello-icon-cancel-1')),:class => 'close', :"data-dismiss" => 'modal', :"aria-hidden" => 'true')
        concat content_tag(:h4, header_text)
    end
end

def modal_body(page_header = "")
    content_tag(:div, :class => 'modal-body') do
        content_tag(:div, :class => 'page-header') do
            concat content_tag(:p, page_header)
        end
        content_tag(:div, :class => 'row-fluid') do
            yield
        end
    end     
end 

def modal_footer
    content_tag(:div, :class => 'modal-footer') do
        concat content_tag(:button, 'Close', type: "button", :class => 'btn btn-boo', :"data-dismiss" => 'modal')
        concat content_tag(:button, 'Save', type: "button", class: 'btn btn-green')
    end     
end 

结尾

链接如下所示:

<%= modal_link "New Stupid Modal", "stupid_modal" %>

模态 html 看起来像这样:

<%= modal('stupid_modal', 'Shouldnt this work?', submit: true, tabindex: '-1') do %>
    <% render 'stupid_modal_partials/stupid_modal' %>
<% end %>

输出是这样的:

<button aria-hidden="true" class="close" data-dismiss="modal"><i>{:class=&gt;&quot;fontello-icon-cancel-1&quot;}</i></button>

在页面源代码中看起来像这样:

<i>{:class=>"fontello-icon-cancel-1"}</i>

更新:

将 modal_header 更改为此有效:

def modal_header(header_text)
    content_tag(:div, :class => 'modal-header') do
        concat content_tag(:button,(content_tag(:i, "",:class => 'fontello-icon-cancel-1')),:class => 'close', :"data-dismiss" => 'modal', :"aria-hidden" => 'true')
        concat content_tag(:h4, header_text)
    end
end

但这不会:

def modal_header(header_text)
    content_tag(:div, :class => 'modal-header') do
        concat content_tag(:button,:class => 'close', :"data-dismiss" => 'modal', :"aria-hidden" => 'true') do
            concat content_tag(:i, "",:class => 'fontello-icon-cancel-1')
        end
        concat content_tag(:h4, header_text)
    end
end

这引出了一个问题，wzup 与 concat？我是否遗漏了什么——我还尝试将空引号作为按钮 content_tag 的第二个参数

Answer 1

您无需使用 concat .

每个 Rails 助手都返回一个包含一些 html 的字符串:

tag(:br) # "<br>"

所以你最简单的辅助方法是这样的:

# "<br>"
def br
  tag(:br)
end

如果您有多个 html 字符串，请将它们总结起来:

# "<button>Close</button><button>Save</button>"
def modal_buttons
  content_tag(:button, "Close") + content_tag(:button, "Save")
end

请注意，您不能只调用它们，因为它们不会修改 View

# "<button>Save</button>"
def modal_buttons
  content_tag(:button, "Close") # this won't do anything
  content_tag(:button, "Save")
end

对于 block ，同样的规则适用:

# "<div><button>Close</button><button>Save</button></div>"
def modal_footer
  content_tag(:div) do
    # what block returns will be inside the div
    content_tag(:button, "Close") + content_tag(:button, "Save")
  end
end

def modal_body
  content_tag(:div) do
    modal_header + yield + modal_footer
  end
end

附带说明一下，仅使用 Rails 助手来构建整个 View 并不是真正的预期目的。他们应该在动态的地方帮助你，静态 html 最好在 ERB 模板中完成。