JavaScript Class

Event Handlers

Events are how we trigger JavaScript to do something. Most everything that a visitor of your site does, can be an event. For example, if a user clicks somewhere on a page with their mouse, that's an event. If a user loads or refreshes the page, that's an event.

Below is a list of some of the more commonly used event Handlers and their descriptions:

onBlur

occurs when a select, text, or textarea form item is acted upon and then moved off of by the user. In other words, the user loses focus on the item.

onChange

occurs when the text in a select, text, or textarea form item is altered by the user. Usually this command is used to check what the user has entered for errors.

onClick

occurs when the user clicks on an object such as a link.

onFocus

occurs when the user selects a text, textarea, or select form item. In other words, the user focuses on that item.

onLoad

acts to trigger a function when the page loads. The command is placed in the BODY portion of the HTML document.

onMouseOut

used within the hypertext link to create text when the mouse is moved off of the item. It is most often used in conjunction with onMouseOver.

onMouseOver

used within the hypertext link that reacts when the user passes a mouse pointer over the link text.

onSelect

activated when the user highlights text in a text or textarea form item.

onSubmit

activated when the user clicks on a form submit button

onUnload

placed inside the BODY command of the HTML document and either calls for a function or contains the command to stop a function from running when the user unloads, or leaves, the page

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