Function: getAttribute(domElementOrCSSSelector, stringAttributeName)

Shorthand: getAttr(domElementOrCSSSelector, stringAttributeName)

Description: Returns the specified attribute value for a DOM element, markup string, or CSS selector referenced element.

Returns: Attribute Value.

Note: The getAttribute() function always returns an attribute value or null if undefined, even when chained.

Example:

// Get an attribute on a DOM element
var tabIndex = $A.getAttribute(domElement, "tabindex");

// Get an attribute on a DOM element referenced by a CSS selector
var listboxValue = $A.getAttribute('#myListbox *[role="option"][aria-selected="true"]', "data-value");

// Or the same using chaining

// Get an attribute on a DOM element
var tabIndex = $A(domElement).getAttribute("tabindex");

// Get an attribute on a DOM element referenced by a CSS selector
var listboxValue = $A('#myListbox *[role="option"][aria-selected="true"]').getAttribute("data-value");