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xPath help > Find img with alt='My Keyword'

Answer 1

A:

I don't understand exactly what elements are you loooking for but there is the example, which returns all elements h1 which contains at least one image with keyword in alt:

//h1[.//img[constains(@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[constains(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>

Gaim 2010-10-30 13:47:00

Thanks Gaim, I'm looking to determine if at least one image within the content has an alt containing the keyword. I think I can take your example and go from there. Thanks a ton!

Scott B 2010-10-30 16:31:32

@Scott-B: Please, edit your question and put your comment at the start of the text. Otherwise it makes little sense and doesn't contain a question at all.

Dimitre Novatchev 2010-10-30 17:30:29

Answer 2

+1 A:

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'.

Dimitre Novatchev 2010-10-30 17:29:01

Thanks Dimitre. That makes perfect sense. Could I use xpath to determine if the keyword appears in the first and/or last sentence of the document? I'm thinking xpath would not recognize a "sentence" as an entity like a node.

Scott B 2010-10-30 18:25:45

@Scott-B: You need to define "sentence" precisely.

Dimitre Novatchev 2010-10-30 18:44:00

I don't see difference between my and your answer except 4 hours but never mind

Gaim 2010-10-30 21:22:36

@Gaim: Your answer selects all `h1` elements that have a descendent `img` element whose `alt` attribute contains some specific string. Instead, what @Scott-B wants is to know just one bit of information -- `true()` or `false()` -- "*Is* there such an element". This is what I give him with my answer.

Dimitre Novatchev 2010-10-30 22:29:21

@Dimitre: +1 Good answer.

Alejandro 2010-10-31 19:18:26

@Scott-B: If by "sentence" you mean HTML "block element", then you could test for not preceding "block" elements (first test), or not following "block" element (last test).

Alejandro 2010-10-31 19:21:15

@Scott-B: If by "sentence" you mean string tokenized by new line character, you could test for not preceding text nodes having a new line character or not following text nodes having a new line character.

Alejandro 2010-10-31 19:38:15

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xPath help > Find img with alt='My Keyword'

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