使用Xpath选择特定的非空节点

Question

我有两个Xpath请求：

$was_price_location = "//ul[@id='items']/li/div[@class='productprice']/span[@class='price' or @class='recRP rrp']";
$now_price_location = "//ul[@id='items']/li/div[@class='productprice']/span[@class='prevPrice previousprice' or @class='price outlet-current-price']";

但是，我想修改它，以便只返回指定不为空的节点。

目前，它发现多余的<span class="recRP rrp">和<span class="prevPrice previousprice">个节点是空的，因此与我无关。

Answer 1

这应该有效：

$prod_price_location = "//ul[@id='items']/li/div[@class='productprice']";
$was_price_location = $prod_price_location . 
    "/span[@class='price' or @class='recRP rrp'][normalize-space()]";
$now_price_location = $prod_price_location . 
    "/span[@class='prevPrice previousprice' or @class='price outlet-current-price']" .
    "[normalize-space()]";