标签: xpath

我有以下两个代码段做同样的事情,除了一个是编译表达式而另一个只是评估它.

    //1st option - compile and run

    //make the XPath object compile the XPath expression
    XPathExpression expr = xpath.compile("/inventory/book[3]/preceding-sibling::book[1]");
    //evaluate the XPath expression
    Object result = expr.evaluate(doc, XPathConstants.NODESET);
    nodes = (NodeList) result;
    //print the output
    System.out.println("1st option:");
    for (int i = 0; i < nodes.getLength(); i++) {
        System.out.println("i: " + i);
        System.out.println("*******");
        System.out.println(nodeToString(nodes.item(i)));
        System.out.println("*******");
    }


    //2nd option - evaluate an XPath expression without compiling

    Object result2 = xpath.evaluate("/inventory/book[3]/preceding-sibling::book[1]",doc,XPathConstants.NODESET);
    System.out.println("2nd option:");
    nodes = (NodeList) result2;
    //print the output
    for (int i …

我有一个xform文档

<?xml version="1.0" encoding="UTF-8"?><h:html xmlns:h="http://www.w3.org/1999/xhtml" xmlns="http://www.w3.org/1999/xhtml"
xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:jr="http://openrosa.org/javarosa">
<h:head>
    <h:title>Summary</h:title>
    <model>
        <instance>
            <data vaultType="nsp_inspection.4.1">
                <metadata vaultType="metadata.1.1">
                    <form_start_time type="dateTime" />
                    <form_end_time type="dateTime" />
                    <device_id type="string" />
                    <username type="string" />
                </metadata>
                <date type="date" />
                <monitor type="string" />
            </data>
        </instance>
    </model>
</h:head>

我想使用xpath和jdom从xform中选择数据元素

XPath xpath = XPath.newInstance("h:html/h:head/h:title/");

似乎工作正常,并选择标题元素,但

XPath xpath = XPath.newInstance("h:html/h:head/model");

不选择模型元素.我想这与命名空间有关.

文件结构:

<program>
 <projectionDay>
   <projection/>
   <projection/>
 </projectionDay>
 <projectionDay>
   <projection/>
   <projection/>
 </projectionDay>
</program>

我想选择第一个和最后一个投影(在整个文档中).

这会返回它:

/descendant::projection[position() = 1 or position() = last()]

这将在projectionDay中返回第一个和最后一个

//projection[position() = 1 or position() = last()]

为什么会这样？

我有以下HTML文档

<div class="books">
  <div class="book">
    <div>
      there are many deep nested elements here, somewhere there will be one span with  some text e.g. 'mybooktext' within these
      <div>
        <div>
          <div>
            <span>mybooktext</span>
          </div>
       </div>
     </div>
  </div>
<div>
 there are also many nested elements here, somewhere there will be a link with a class called 'mylinkclass' within these. (this is the element i want to find)
 <div>
   <div>
     <a class="mylinkclass">Bla</a>
   </div>
 </div>
</div>
</div>
<div class="book">
<div>
 there are many deep nested elements …

我正在废弃一个网站,我在scrapy中写了一个蜘蛛,但我能够使用这个提取产品价格:

hxs.select('//div[@class="product_list"]//div[@class="product_list_offerprice"]/text()').extract()

通过scrapy shell

但是当我试图用蜘蛛做同样的事情时它会返回空列表

这是我的蜘蛛代码:

from eScraper.items import EscraperItem
from scrapy.selector import HtmlXPathSelector
from scrapy.contrib.spiders import CrawlSpider

#------------------------------------------------------------------------------ 

class ESpider(CrawlSpider):
    name = "ashikamallSpider"

    allowed_domains = ["ashikamall.com"]
    URLSList = []

    for n in range (1,51):
        URLSList.append('http://ashikamall.com/products.aspx?id=222&page=' + str(n))        

    start_urls = URLSList


    def parse(self, response):                  

        hxs = HtmlXPathSelector(response)        
        sites = hxs.select('//div[@class="product_list"]')        
        items = []

        for site in sites:
            item = EscraperItem()
            item['productDesc'] = ""            
            item['productSite'] = "http://1click1call.com/"
            item['productTitle'] =  site.select('div[@class="product_list_name"]/h3/text()').extract()
            item['productPrice'] = site.select('div[@class="product_list_offerprice"]/text()').extract()            
            item['productURL'] = "http://ashikamall.com/" + site.select('div[@class="product_list_image"]/a/@href').extract()[0].encode('utf-8')
            item['productImage'] …

我的代码看起来像:

file = Nokogiri::XML(File.open('file.xml'))
test = file.xpath("//title") #all <title> elements in xml file

然后,当我尝试:

puts test.uniq

我收到以下错误:

 undefined method `uniq' for #<Nokogiri::XML::NodeSet:0x000000011b8bf8> 

是test不是数组？如果不是,我该怎么做呢？

否则,我如何只从test数组中获取唯一值？

所以我使用的是Selenium和Python 2.7的组合(如果重要的话,我所使用的浏览器是Firefox).我是XPath的新手,但对于获取WebElements似乎非常有用.

我有以下HTML文件,我正在解析:

<html>
  <head></head>
  <body>
    ..
    <div id="childItem">
      <ul>
        <li class="listItem"><img/><span>text1</span></li>
        <li class="listItem"><img/><span>text2</span></li>
        ...
        <li class="listItem"><img/><span>textN</span></li>
      </ul>
    </div>
  </body>
</html>

现在我可以使用以下代码获取所有li元素的列表:

root  = element.find_element_by_xpath('..')
child = root.find_element_by_id('childDiv')
list  = child.find_elements_by_css_selector('div.childDiv > ul > li.listItem')

我想知道如何在XPath语句中执行此操作.我尝试了一些法规,但最简单的是:

list  = child.find_element_by_xpath('li[@class="listItem"]')

但我总是得到错误:

selenium.common.exceptions.NoSuchElementException: Message: u'Unable to locate element: {"method":"xpath","selector":"li[@class=\\"listItem\\"]"}';

因为我有一个解决方法(前三行)这对我来说并不重要,但我想知道我做错了什么.

我需要使用capyvara从选定的单选按钮内的span标签中读取文本值

我有一个radio button后跟文本的列表及其括号内的计数.

例如:radiobutton with Thank You(82) I what想要读取括号内选定的单选按钮数82.

我使用以下代码..但它不起作用

value=page.find(".cardFilterItemSelection[checked='checked'] + span.itemCount").text

并尝试使用Xpath但没有得到任何东西

 value=page.find(:xpath,"//input[@class = 'cardFilterItemSelection' and @checked = 'checked']/span[@class = 'itemCount']/text()")

怎么可能？

<label id="thankyou_label" for="thankyou_radio" class="itemName radio">
  <input checked="checked" tagtype="Occasion" value="Thank You" id="thankyou_radio" name="occasionGroup" class="cardFilterItemSelection" type="radio">
  <span class="occasion_display_name">
    Thank You 
  </span>
  <span class="itemCount">
    (82)
  </span>
</label>

<label id="spring_label" class="itemName radio" for="spring_radio">
  <input id="spring_radio" class="cardFilterItemSelection" type="radio" name="occasionGroup" value="Spring" tagtype="Occasion">
  <span class="occasion_display_name">
    Spring 
  </span>
  <span class="itemCount">
    (0)
  </span>
</label>

我想检查一个xml,如果有一个节点的值为"Hotel Hafen Hamburg".

但是我得到了错误.

SimpleXMLElement :: xpath():第25行的谓词无效

你可以在这里查看xml.

http://de.sourcepod.com/dkdtrb22-19748

到目前为止,我已经编写了以下代码.

$apiUmgebungUrl = "xml.xml";
$xml_umgebung = simplexml_load_file($apiUmgebungUrl);
echo $nameexist = $xml_umgebung->xpath('boolean(//result/name[@Hotel Hafen Hamburg');

请看下面的html片段:

<tr class="clickable">
<td id="7b8ee8f9-b66f-4fba-83c1-4cf2827130b5" class="clickable">
<a class="editLink" href="#">Single</a>
</td>
<td class="clickable">£14.00</td>
</tr>

当td [1]包含"Single"时,我试图断言td [2]的值.我尝试了各种各样的变种:

//td[2][(contains(text(),'£14.00'))]/../td[1][(contains(text(),'Single'))]

我在其他地方成功地使用了类似的符号 - 但在这里无济于事......我认为这是由于嵌套元素的td [1],但不确定.

有人可以启发我的错误吗？:)

干杯!