In other words, the method closest goes up from the element and checks each of parents.
Looping on the other hand is a bit more complex. JavaScript can be said to be an extension of regular HTML code.
To get all siblings of an element, we’ll use the logic: First, select the parent of the element whose siblings that you want to find. There is another method to get the child element which I am going to discuss now. That’s another one that’s gotten me before ;). Next, keep in mind that the method name is case sensitive. I couldn’t tell you how many time’s I’ve written getElementById('#someId') forgetting that I’ve switched gears and wasn’t writing a CSS selector. The class names will need to be separated by spaces and then the method will return the elements that match all of the class names provided: Remember, the class names provided don’t need to be prefixed with a period, as with CSS selectors. Outside of looping through and interrogating each element, there’s not a great way to get the power of multiple selectors. Oftentimes software libraries are created to help fill the shortcomings of a particular language. The HTMLCollection is similar to an array, but does deviate a bit as it lacks looping methods like forEach(). On each loop, we’ll grab the element’s .parentNode and see if it has our selector. Pass it a CSS selector (as crazy or as tame as you’d like) and you will receive the first matched element back: Looking for more than just the first element that matched? Remember that the id attribute is supposed to be unique across your entire HTML document, so this method will only ever return a single element. Creating a helper function. Ancestors of an element are: parent, the parent of parent, its parent and so on. The elem itself is also included in the search.. As mentioned HTMLCollection doesn’t have the array looping methods we know and love, like .forEach() or .map() but we can tap into the Array.prototype to access those looping methods anyway: Note that we link to certain 3rd party products via affiliate or sponsored links. closest. The first of two methods that use CSS selectors is querySelector(). In this example, when someone clicks an .accordion-toggle link, I want to get the .accordion element, but I don’t neccessarily know how many nested div’s will be in the markup.. document.getElementsByClassName(); Now we want to access more than one element, and in our example we have two elements with a demo class.
Code snippets licensed under MIT, unless otherwise noted. We can get all the elements with a given class name with the getElementsByClassName() method. Not much to grabbing the length, just append .length to the HTMLCollection and you’ll be greeted with an integer value: The first element of an HTMLCollection is the element that first matched the selection criteria when the method scanned the DOM. You can learn more about it here.
Get all siblings of an element. To do this, we can setup a for loop to climb up the DOM. Give it a tag name and it will return all of the elements for that tag: This method only lets you pull a single tag name at a time, but if you pass in * as the tag name, you will receive every element in the DOM tree: Want to grab the elements that have a specific name attribute?
Lastly, the ID string supplied to the method should not include a pound sign.
The ancestors together form the chain of parents from the element to the top. JavaScript code cannot exist by itself- it must be embedded inside regular HTML code (or even CSS code).