InputElement

InputElement is a DOM API interface representing user input controls in HTML documents. In standard web browsers, the native representation is HTMLInputElement; in some language bindings it is exposed as InputElement. Each instance corresponds to a single input element in the document.

Input elements are form controls that collect user data. They support a type attribute that selects the input type (for example text, password, email, number, date, checkbox, radio, file, image, etc.). The type affects available properties and behavior.

Common properties include value (the current content), type, checked (for boolean types), disabled, placeholder, name, required, readOnly, size, maxLength, min, max, and step. For file inputs, the files property provides a FileList. For image-type inputs, the src attribute specifies the image used as a submit button. The input element may also expose lists such as list (for datalist) and autocomplete, pattern, and multiple attributes.

Common methods include select() to select the text for text-like inputs, setCustomValidity() for custom validation messages, checkValidity() and reportValidity() to run constraint validation, and focus() to receive keyboard input focus. The element fires events such as input, change, and invalid to reflect user changes and validation status.

InputElement participates in form submission and client-side validation through the browser’s constraint validation API. It is widely supported across browsers and language bindings, and remains central to user entry in web forms.