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4 Ιαν 2013 · javascript var data_length = document.getElementById('the_ul').getAttribute('data-length'), i = 0; while(i++ < data_length) { document.getElementById('id_name' + i).className = 'a_new_class'; }
The getElementById() method returns an element with a specified value. The getElementById() method returns null if the element does not exist. The getElementById() method is one of the most common methods in the HTML DOM. It is used almost every time you want to read or edit an HTML element.
getElementById is a built-in JavaScript function that allows you to select an HTML element using its unique ID attribute. It returns the element as an object in the Document Object Model (DOM) so that you can manipulate it or access its properties and attributes. Example:
There are 2 different ways to get elements by id in javascript: getElementById and querySelector. Learn both method with their use and examples with code
To get an element by id, you use the getElementById() method of the Document object: The method returns an element whose id matches a specified string. The id is case-sensitive. If no matching element was found, the method returns null. Since the id is supposed to be unique, using the getElementById() method is a fast way to select an element.
The document.getElementById() returns a DOM element specified by an id or null if no matching element is found. If multiple elements have the same id , even though it is invalid, the getElementById() returns the first element it encounters.
28 Οκτ 2024 · Loops offer a quick and easy way to do something repeatedly. This chapter of the JavaScript Guide introduces the different iteration statements available to JavaScript.
