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HTML DOM getElementById() Method - W3Schools
The getElementById() method returns the element that has the ID attribute with the specified value. This method is one of the most common methods in the HTML DOM, and is used almost every time you want to manipulate, or get info from, an element on your document. Returns null if no elements with the specified ID exists.
DOM: Get Elements by ID, Tag, Name, Class, CSS Selector
Get Current Script Element. document .currentScript → return the current script element. [see DOM: Get Current Script Tag]. Get Element by Matching the Value of the 「id」 Attribute. document.getElementById(id_string)Return a non-live element object.
Searching: getElement*, querySelector* - JavaScript
querySelector. The call to elem.querySelector(css) returns the first element for the given CSS selector.. In other words, the result is the same as elem.querySelectorAll(css)[0], but the latter is looking for all elements and picking one, while elem.querySelector just looks for one. So it’s faster and shorter to write. matches. Previous methods were searching the DOM.
HTML DOM getElementsByTagName() Method - W3Schools
The getElementsByTagName() method returns a collection of an elements's child elements with the specified tag name, as a NodeList object. The NodeList object represents a collection of nodes. The nodes can be accessed by index numbers. The index starts at 0.
Document.getElementById() - Web APIs | MDN
The Document method getElementById() returns an Element object representing the element whose id property matches the specified string. Since element IDs are required to be unique if specified, they're a useful way to get access to a specific element quickly.
Element.getElementsByTagName() - Web APIs | MDN
The Element.getElementsByTagName() method returns a live HTMLCollection of elements with the given tag name. All descendants of the specified element are searched, but not the element itself. The returned list is live, which means it updates itself with the DOM tree automatically.Therefore, there is no need to call Element.getElementsByTagName() with the same element and arguments repeatedly ...
How to use getElementById to get the elements in a form
Sample code Download the sample code here: getelementbyid-form-sample.zip There are many ways of accessing form elements, of which the easiest is by using the cross-browser W3C DOM document.getElementById() method. Before we learn more about this method, it would be useful to know something about the Document Object Model (DOM), the concept of HTML nodes or elements, and the concept of containers.
Document.getElementsByTagName() - Web APIs | MDN
The getElementsByTagName method of Document interface returns an HTMLCollection of elements with the given tag name. The complete document is searched, including the root node. The returned HTMLCollection is live, meaning that it updates itself automatically to stay in sync with the DOM tree without having to call document.getElementsByTagName() again. ...