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Re: extracting sub elements from DOM by classby haukex (Archbishop) |
on Mar 26, 2021 at 21:14 UTC ( #11130401=note: print w/replies, xml ) | Need Help?? |
I must admit: I dont understand the DOM and scraping websites is a pain if you dont know it. The basics of DOM are actually not all too difficult - it's basically a tree structure with nodes of different types. They're often represented as objects with a base "node" class that supports methods like "what are the children of this node", and the different node types are implemented as subclasses of this node (XML::LibXML works this way; Mojo::DOM AFAIK doesn't, but these are just implementation details). The two most common are "element" nodes, that represent <elements>s (including their attributes), and text nodes, that represent any text in between elements. There's also "comment" nodes that represent <!-- comments -->, etc. In my experience, probably one of the most common things to confuse people is that this structure is very formal and rigid, asking a question like "what is the text content of <p>Hello, <b>cool</b> World!</p>?" is not as obvious as one might think. This <p> element has three children: the text "Hello, ", the element <b>, and the text " World!". To get all the text content means to walk down the tree and include the text child node "cool" of the <b> element too. Most libraries have functions that do this for you though. Anyway, one nice thing about Mojo::DOM is that it supports CSS selectors. This is related to the DOM of course, but actually simplifies finding things in the DOM a lot. They're a little bit like a more flexible XPath. See Mojo::DOM::CSS: ids can be selected via #idname and classes can be selected via .classname, with automatic handling of multiple classes, e.g. your class="fa fa fa-mobile-phone" can be selected via e.g. .fa-mobile-phone or perhaps .fa.fa-mobile-phone, though interestingly I don't see a mention of the latter in the docs (it's in the W3C specs though). Your HTML appears to be structured as a class="item-list" with <div class="item">s containing the data, so that's what I'd start with. What I think is quite strange is <span><i class="fa fa fa-phone"></i>011111111</span>, it's unclear to me why the class="fa fa fa-phone" isn't on the <span> that actually contains the data but is instead on the empty <i> in front of it. But oh well, we can deal with that too. (Update: Oh, they're Font Awesome icons.)
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