我正在做 Ryan Bates可排序表列截屏视频
如果该项目位于th
标签内,并且如果选择了该项目,我想应用一种样式,我该怎么做?
瑞安屏幕演员代码:
控制器
class ProductsController < ApplicationController
helper_method :sort_column, :sort_direction
def index
@products = Product.order(sort_column + " " + sort_direction)
end
# ...
private
def sort_column
Product.column_names.include?(params[:sort]) ? params[:sort] : "name"
end
def sort_direction
%w[asc desc].include?(params[:direction]) ? params[:direction] : "asc"
end
end
帮手
def sortable(column, title = nil)
title ||= column.titleize
css_class = column == sort_column ? "current #{sort_direction}" : nil
direction = column == sort_column && sort_direction == "asc" ? "desc" : "asc"
link_to title, {:sort => column, :direction => direction}, {:class => css_class}
end
index.html.erb
<tr>
<th><%= sortable "name" %></th>
<th><%= sortable "price" %></th>
<th><%= sortable "released_at", "Released" %></th>
</tr>
概念
<tr>
<th class=<%= @selected %> ><%= sortable "name" %></th>
<th class=<%= @selected %> ><%= sortable "price" %></th>
<th class=<%= @selected %> ><%= sortable "released_at", "Released" %></th>
</tr>
CSS
.pretty th .current {
padding-right: 12px;
background-repeat: no-repeat;
background-position: right center;
}
.pretty th .asc {
background-image: url(/images/up_arrow.gif);
}
.pretty th .desc {
background-image: url(/images/down_arrow.gif);
}