But when would that searching inside another string might be useful? Well, we all do that all the time even if you're not aware of using them. In this video you will learn about how to find a string pattern inside another string pattern using regular expressions.

ntains(elemB) returns true if elemB is inside elemA (a descendant of elemA) or when elemA=elemB.0:00 Hey, it's Harit Himanshu from bonsaiilabs.

The elem itself is also checked.Īnd let’s mention one more method here to check for the child-parent relationship, as it’s sometimes useful:

There is elem.closest(css) to look for the nearest ancestor that matches the given CSS-selector.There is elem.matches(css) to check if elem matches the given CSS selector.There are 6 main methods to search for nodes in DOM: Methodīy far the most used are querySelector and querySelectorAll, but getElement(s)By* can be sporadically helpful or found in the old scripts. The static collection did not increase after the appearance of a new div in the document. Let divs = document.querySelectorAll('div') document.getElementsByName(name) returns elements with the given name attribute, document-wide.

elem.getElementsB圜lassName(className) returns elements that have the given CSS class.The tag parameter can also be a star '*' for “any tags”. elem.getElementsByTagName(tag) looks for elements with the given tag and returns the collection of them.So here we cover them mainly for completeness, while you can still find them in the old scripts. Today, they are mostly history, as querySelector is more powerful and shorter to write. There are also other methods to look for nodes by a tag, class, etc. Let chapter = document.querySelector('.chapter') // LIĪlert(chapter.closest('.contents')) // DIVĪlert(chapter.closest('h1')) // null (because h1 is not an ancestor)

Javascript string search