XPath來獲取節點值

Question

我不知道如何使用XPath

<div class="home_delivery_promo_banner"><span class="fleft"> <strong>Next day delivery (now includes Saturdays)</strong></span> 

到目前爲止，我已經寫了下面的代碼在節點中獲得價值。

stock = xpathSApply(page,'//div[@class="home_delivery_promo_banner"]//span[@class="fleft"]//strong//text()',xmlValue,"class") 

parenturl = "http://www.diy.com/nav/rooms/kitchens/handles-hinges/knob_handles/Cooke-and-Lewis-Dimpled-Knob-Pewter-Effect-9291589&bqrefcmp=AW&bqrefcre=AW_AFFILIATES" 

srcpage = getURLContent(GET(parenturl)$url,timeout(10)) 
page = htmlParse(srcpage,useInternalNodes = T,encoding='UTF-8')  
stock = xpathSApply(page,'//div[@class="home_delivery_promo_banner"]//span[@class="fleft"]//strong// text()',xmlValue,"class") 

提前感謝

Answer 1

這是正確的。確保您使用的是htmlParse而不是xmlParse。例如，下面的代碼適用於我。

hp <- htmlParse('<div class="home_delivery_promo_banner"><span class="fleft"> <strong>Next day delivery (now includes Saturdays)</strong></span>') 
xpathSApply(hp, '//div[@class="home_delivery_promo_banner"]//span[@class="fleft"]//strong//text()',xmlValue,"class") 
# [1] "Next day delivery (now includes Saturdays)"