Getting video src? about goquery HOT 5 CLOSED

Hi Evan,

That's because in Go, a function can return multiple values, and that is the case for the Attr() method. It returns the attribute's value (if any), and a boolean indicating if the attribute actually exists on the selection. That's often referred to as the "comma ok" idiom in Go, because you usually call those type of methods like this:

val, ok := MultiReturnFunc()

So in your case, you would write:

mp4, ok := s.Find("video").Attr("src") and you can check ok to make sure the attribute exists, or if you don't care either way, you can discard the second return value using an underscore as variable name (the "blank" identifier, since the compiler will complain if ok is never used).

Have fun!
Martin

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Thanks for the help! and sorry to bug again, but could you look at my code and help me figure out why I'm getting blank returns on my query? Instead of getting the .mp4 link I get nothing and the program stops without an error or anything.

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Ah yes, the code is correct, it's just that the whole page is javascript-heavy. If you disable javascript and load the page, you'll see that there's nothing there, so that's what goquery sees.

I've heard of some people that have used goquery with a headless browser to scrape javascript-based webpages, but I haven't tried it myself. I believe it was with this: https://github.com/sourcegraph/webloop

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@eriley in this case you actually don't need a full webkit (cookies and what not). You 'just' need a javascript interpreter (like otto) and evaluate the contents of the first <script> Tag.

This gist has a solution if you want to take a look.

ps: don't fetch them all at once ;)

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Thanks for recommendations 😄 I was able to use use the VineURL and then add /card to it, and it just gives the mp4 in a html5 video player without any hassle. I'll be sure to remember you're recommendations for the future though!

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