Web Development

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Is it possible to get the value of a CSS property in an HTML element, using XPath 1.0? (sh.itjust.works)

submitted 3 months ago by [email protected] to c/webdev

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Say you have HTML similar to the following:

<div style="background-image: url('https://some.domain/image')"></div>

and you want to extract https://some.domain/image using XPath. With XPath 2.0, you can select the URL with something like

select-before(select-after(//div/@style, "backgound-image: url("), ")")

but, when using XPath 1.0, this fails — I think it's due to nested functions not being supported in XPath 1.0, but I have been unable to find documentation to confirm that. Is there a way to accomplish this using XPath 1.0?

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[–] [email protected] 1 points 3 months ago* (last edited 3 months ago)

Asking just because I’m curious… why are you using xpath?

I'm using a service called FreshRSS that automatically fetches RSS feeds. It has a feature that allows you to create custom feeds for sites by scraping the HTML with user specified XPath expressions.

I know that this isn't exactly "web development", but it uses webdev tools, and I wasn't entirely sure where else to post this.

If you’re rendering the page (in a browser, e2e test-runner, spider bot, etc…), have you considered running some js on the page to get the image? Something like: const imagePath = document.getElementById('exampleIdOnElement').style.backgroundImage

JS is, unfortunately, not possible here. I can only use XPath expressions.