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[DomCrawler] Document XPath expression evaluation #7033

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Nov 10, 2016
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[DomCrawler] Document XPath expression evaluation #7033

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52 changes: 52 additions & 0 deletions components/dom_crawler.rst
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Expand Up @@ -282,6 +282,58 @@ and :phpclass:`DOMNode` objects:

$html = $crawler->html();

Expression Evaluation
~~~~~~~~~~~~~~~~~~~~~

The ``evaluate()`` method evaluates the given XPath expression.
The return value depends on if the expression operates on simple values
(like HTML attributes), or a subset of the current document.
If the expression evaluates to a scalar value, an array of results will be
returned. If the expression evaluates to a DOM document, a new ``Crawler``
instance will be returned.

This behavior is best illustrated with examples::

use Symfony\Component\DomCrawler\Crawler;

$html = '<html>
<body>
<span id="article-100" class="article">Article 1</span>
<span id="article-101" class="article">Article 2</span>
<span id="article-102" class="article">Article 3</span>
</body>
</html>';

$crawler = new Crawler();
$crawler->addHtmlContent($html);

$crawler->filterXPath('//span[contains(@id, "article-")]')->evaluate('substring-after(@id, "-")');
// array:3 [
// 0 => "100"
// 1 => "101"
// 2 => "102"
// ]

$crawler->evaluate('substring-after(//span[contains(@id, "article-")]/@id, "-")');
// array:1 [
// 0 => "100"
// ]

$crawler->filterXPath('//span[@class="article"]')->evaluate('count(@id)');
// array:3 [
// 0 => 1.0
// 1 => 1.0
// 2 => 1.0
// ]

$crawler->evaluate('count(//span[@class="article"])');
// array:1 [
// 0 => 3.0
// ]

$crawler->evaluate('//span[1]');
// Symfony\Component\DomCrawler\Crawler { }

Links
~~~~~

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