Adds an event handler that runs when the element is clicked.
An element receives a click event when a user clicks on the element and releases.
When a user double-clicks an element, two click events are fired.
Note: Do not use the Editor Link panel to redirect on click when a link is already
defined using the onClick() function. To avoid unpredictable behavior, remove
the link from the Editor Link panel.
handler(event: MouseEvent): void The name of the function or
the function expression to run when the element is clicked.
This method doesn’t return any custom errors, but may return standard errors. Learn more about standard Wix errors.