let selectElement = document.getElementById('mySelect'); let selectedIndex = selectElement.selectedIndex; let selectOption = selectElement.options[selectedIndex]; let attributeValue = selectOption.getAttribute('myAttribute');
Above code snippet essentially follows a straightforward series of steps. First, it fetches our select HTML element by its ID using the `document.getElementById()` function. After obtaining the select element, it determines which option has been selected by the user with the `selectedIndex` property. Next, it utilizes this index to fetch the corresponding option from the options array of the select element. Finally, it retrieves the value of the required attribute from this selected option using the `getAttribute()` function.
Understanding the Document Object Model (DOM)
To clearly comprehend how the solution works, it’s crucial to understand the concept of the Document Object Model (DOM). The **DOM** is a programming interface allowing programs and scripts to dynamically access and update the content, structure, and style of a document. In simple terms, every element in an HTML document can be manipulated using the DOM.
We first come across `document.getElementById()`, a DOM method used to fetch an HTML element using its ID. Every HTML element has a unique ID (if specified), and using this function, we can easily access that element and manipulate it per our requirements.
HTML Select is an input element used to create a drop-down list. The options in this list are defined using the
The `getAttribute()` function is another DOM method. It returns the value of a specified attribute on the element. If the given attribute does not exist, the value returned will either be null or “” (an empty string).