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Web Scraping with AutoHotKey 108- use querySelctorAll for added flexibility
Web Scraping with AutoHotKey 108- use querySelctorAll for added flexibility
Web Scraping with AutoHotkey is fun and easy however some web pages don’t have Names, IDs, or classnames set up. Other times the pages are pretty sophisticated and you want to grab something very specific (w/out writing a lot of code). I recently learned about QuerySelctor
This W3schools page has a great, dynamic tool, that is very helpful to understand what is being grabbed. Here is a…
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DOM4 - query and queryAll
#DOM4 - #query and #queryAll #javascript #js #frontend #webdev #webdesign
Popular frameworks like jQuery, Dojo, and Prototype implemented a way to query elements on a web page in JavaScript using CSS selector. This way of traversing the DOM became so popular and useful that it made it into the standards with querySelector and querySelectorAll. But, those methods are not perfect and that is why we need query and queryAll. (more…)
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How did I go this long not knowing about querySelector or querySelectorAll? These functions are built in, vanilla JavaScript, been available forever (e.g. IE 8!), and mean that if all you need is simple element selection you don't need to include a massive jQuery library (or any of its smaller relatives).
querySelector returns the first matching element for one or more CSS selectors (a comma delimited string) while querySelectorAll returns all matching elements. It returns either a single element or an array of elements so unlike jQuery, there's no chaining.
The methods can be called either on document or on a specific DOM element.