nokogiri +机械化css选择器的文本 [英] nokogiri + mechanize css selector by text

问题描述

我是新的nokogiri和目前最熟悉的CSS选择器，我试图解析表中的信息，下面是表和我使用的代码示例，我坚持适当的if

表：

 
 code>< div class =holder> 
< div class =row> 
< div class =c1> 
<！ - 内容我不需要 - > 
< / div> 
< div class =c2> 
< span class =data> 
<！ - 内容我不需要 - > 
< span class =data> 
< / div> 
< / div> 
 ... 
< div class =row> 
< div class =c1> 
 SPECIFIC TEXT 
< / div> 
< div class =c2> 
< span class =data> 
我想要什么
< / span> 
< / div> 
< / div> 
< / div> 
  

我的脚本：（如果在表中找到SPECIFIC TEXT，数据变量 - 所以我搞错了do循环或if语句的知识）

  data = [] 
 page.agent.get（url）
 page.search（'div.row'）。each do | row_data | 
 if（row_data.search（'div.c1：contains（/ SPECIFIC TEXT /）'）。text.strip 
 temp = row_data.search（'div.c2 span.data'）。 text.strip 
 data<< temp 
 end 
 end 
  

解决方案

当你可以在单个CSS选择器中提取所需的内容时，不需要停止和插入ruby逻辑。

  data = page.search（'div.row> div.c1：contains（SPECIFIC TEXT）+ div.c2 span.data'）
  
 
 
 
这将只包括与选择器匹配的那些（例如遵循SPECIFIC TEXT）。
 
 
 
这是您的逻辑可能出错的地方：
 
 
 
此代码
  if（row_data.search（'div.c1：contains（SPECIFIC TEXT）'... 
 temp = row_data.search（'div.c2 span.data'）... 
  
首先搜索特定文本的行，然后如果匹配，则返回与第二个查询匹配的所有行，关键是CSS选择器中的 + ，它将返回紧随其后的元素（例如下一个兄弟元素）。我假设，下一个元素总是你想要的。
 
I am new to nokogiri and so far most familiar with CSS selectors, I am trying to parse information from a  table, below is a sample of the table and the code I'm using, I'm stuck on the appropriate if statement, as it seems to return the whole contents of the table.

Table:
<div class="holder">
  <div class ="row">
   <div class="c1">
     <!-- Content I Don't need -->
   </div>
   <div class="c2">
    <span class="data">
     <!-- Content I Don't Need -->
    <span class="data">
   </div>
 </div>
 ...
 <div class="row">
  <div class="c1">
   SPECIFIC TEXT
  </div>
  <div class="c2">
   <span class="data">
    What I want
   </span>
  </div>
 </div>
</div>
My Script: (if SPECIFIC TEXT is found in the table it returns every "div.c2 span.data" variable - so I've either screwed up my knowledge of do loops or if statements)
data = []
page.agent.get(url)
page.search('div.row').each do |row_data|
 if (row_data.search('div.c1:contains("/SPECIFIC TEXT/")').text.strip
  temp = row_data.search('div.c2 span.data').text.strip
  data << temp
 end
end

解决方案
There's no need to stop and insert ruby logic when you can extract what you need in a single CSS selector.
data = page.search('div.row > div.c1:contains("SPECIFIC TEXT") + div.c2 span.data')
This will include only those that match the selector (e.g. follow the SPECIFIC TEXT).

Here's where your logic may have gone wrong:

This code
if (row_data.search('div.c1:contains("SPECIFIC TEXT")'...
  temp = row_data.search('div.c2 span.data')...
first searches the row for the specific text, then if it matches, returns ALL rows matching the second query, which has the same starting point. The key is the + in the CSS selector above which will return elements immediately following (e.g. the next sibling element). I'm making an assumption, of course, that the next element is always what you want.

                        
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