xPath help > Find img with alt='My Keyword'
How can I alter this xpath to find if the content contains an img tag with an alt containing m开发者_Go百科y keyword phrase?
$xPath->evaluate('count(/html/body//'.$tag.'[contains(.,"'.$keyword.'")])');
Use:
boolean(//img[contains(@alt, 'yourKeywordHere')])
to find (true(), false()) whether there is an img element in the XML document whose alt attribute contains 'yourKeywordHere'.
Use:
boolean(//yourTag//img[contains(@alt, 'yourKeywordHere')])
to find if there is an element in the document named yourTag that has a descendent img whose alt attribute contains 'yourKeywordHere'.
I don't understand exactly what elements you are loooking for, but here is the example, which returns all elements h1 which contains at least one image with your_keyword in alt:
//h1[.//img[contains(@alt, 'your_keyword')]]
You should also handle if it is case sensitive or not. You can use this xpath but be careful, some xpath evaluators doesn't support lower-case function.
//h1[.//img[contains(lower-case(@alt), lower-case('your_keyword'))]]
Here is example:
//h1[.//img[contains(@alt, 'key ')]]
<html>
<h1> <!-- found -->
<img alt='here is my key' />
</h1>
<h1><!-- not found -->
<img alt='here is not' />
</h1>
<h1> <!-- found -->
<h2>
<img alt='the key is also here' />
</h2>
</h1>
<h1></h1> <!-- not found -->
</html>
加载中,请稍侯......
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