Select unique set of nodes with XPath?

Question

I want to select a set of elements as nodes (the content of div[@class="Adres"]):

<div class="KolumnaStyl">
  <div class="Nazwa">ABCD</div>
    <div class="Adres">
      12-345 Warszawa
      <br/>
      ul. Krasnobrodzka 5
      <br/>
      Mazowieckie

This can be done with:

//div[@class="KolumnaStyl"]/div[@class="Adres"]/node()

As it happens, there are two identical div[@class="Adres"] on the page, which means that node() currently selects the content of both of them. I can't, however, call //div[@class="KolumnaStyl"][1] - that doesn't select the first occurrence.

How can I select a unique set of nodes if the parent directory exists multiple times?

Arrays start from zero don't they? If you want the first occurrence wouldn't you use a zero? //div[@class="KolumnaStyl"][0] ? — user3334690, Mar 10 '14 at 13:19
It means the first appearance of //div[@class="KolumnaStyl"]//div[@class="Adres"] — Severin, Mar 10 '14 at 13:19

Arup Rakshit · Answer 1 · 2014-03-10T13:57:10.307

0

If you want the first matched one, then do :

(//div[@class="KolumnaStyl"]//div[@class="Adres"])[1]/node()

In XPATH first means 1, not 0.

Here is a sample HTML :

<body>
    <div class="foo">
        <p> 12 </p>
    </div>
    <div class="foo">
        <p> 112 </p>
    </div>
</body>

XPATH expression:

(//div[@class = 'foo'])[1]

output

<div class="foo">
  <p>12</p>
</div>

edited Mar 10 '14 at 13:57

answered Mar 10 '14 at 13:20

Arup Rakshit

113,563
27
250
306

The Xpath you provided is invalid? – Severin Mar 10 '14 at 13:23
@Severin Why so you think ? – Arup Rakshit Mar 10 '14 at 13:23
I get "Invalid Xpath". It brakes as soon as I add parenthesis around the div. – Severin Mar 10 '14 at 13:28
@Severin: The opening parenthesis should be at the very beginning. – choroba Mar 10 '14 at 13:45

score 0 · Accepted Answer · edited May 23 '17 at 12:28

0

Take a look at "XPath Get first element of subset".

Basically, predicates have higher precedence than the / and // operators.

So, (//div[@class="KolumnaStyl"]//(div[@class="Adres"]))[1] should return your desired result.

Also check out the spec for more background info.

edited May 23 '17 at 12:28

Community

1
1

answered Mar 10 '14 at 13:47

Momer

3,062
21
23

Select unique set of nodes with XPath?

2 Answers2