传说中的truncate_html
学习用rails做blog的时候要用到rails的truncate功能。<%= h truncate(post.content, 100, "...") %>
问题来了，将html截断后出现不完整的tag，导致后续的文章排版都错乱了。
本来考虑是不是自己写一个，正在思考思路，结果祭起google，好吗，已经有牛人写了
原地址：http://henrik.nyh.se/2008/01/rails-truncate-html-helper
简单记录一下：
将下面代码保存到app/helpers/text_helper.rb。
# By Henrik Nyh <http://henrik.nyh.se> 2008-01-30.# Free to modify and redistribute with credit.require "rubygems"require "hpricot"module TextHelper# Like the Rails _truncate_ helper but doesn't break HTML tags or entities.def truncate_html(text, max_length = 30, ellipsis = "...") return if text.nil? doc = Hpricot(text.to_s) ellipsis_length = Hpricot(ellipsis).inner_text.chars.length content_length = doc.inner_text.chars.length actual_length = max_length - ellipsis_length content_length > max_length ? doc.truncate(actual_length).inner_html + ellipsis : text.to_sendendmodule HpricotTruncatormodule NodeWithChildren def truncate(max_length) return self if inner_text.chars.length <= max_length truncated_node = self.dup truncated_node.children = [] each_child do |node| remaining_length = max_length - truncated_node.inner_text.chars.length break if remaining_length == 0 truncated_node.children << node.truncate(remaining_length) end truncated_node endendmodule TextNode def truncate(max_length) # We're using String#scan because Hpricot doesn't distinguish entities. Hpricot::Text.new(content.scan(/&#?[^\W_]+;|./).first(max_length).join) endendmodule IgnoredTag def truncate(max_length) self endendendHpricot::Doc.send(:include, HpricotTruncator::NodeWithChildren)Hpricot::Elem.send(:include, HpricotTruncator::NodeWithChildren)Hpricot::Text.send(:include, HpricotTruncator::TextNode)Hpricot::BogusETag.send(:include, HpricotTruncator::IgnoredTag)Hpricot::Comment.send(:include, HpricotTruncator::IgnoredTag)
然后在app/controllers/application.rb中添加
helper Text
现在可以在view代码中使用
<%= h truncate_html(post.content, 100, "...") %>
ok，完成。
页:
[1]