Most HTML tags include several event attributes that can be used to trigger scripts. lists these attributes and their use for triggering scripts.
Note Many of the event attribute triggers are dependent on the element(s) to which they apply being “in focus” at the time of the trigger. For example, in an HTML form an onmouseout event attached to one field will not trigger unless the same field has the focus.
Event triggers have a variety of uses, including the following:
✦ Form data verification
Using onfocus and onblur attributes, each field can be verified as it is edited. Using onsubmit and onreset, an entire form can be verified or reset when the appropriate button is clicked
✦ Image animation
Using onmouseover and onmouseout attributes, an image can be animated when the mouse pointer passes over it
✦ Mouse navigation
Using onclick and ondblclick attributes, you can trigger user agent navigation when a user clicks or double-clicks an element
For example, you can create images to use as buttons on your page.
Figure shows two images for use on a button. The image on the left is used for general display, while the image on the right is used when the mouse is over the button.
Tip Users appreciate visible feedback from elements on your page. As such, it is important to always provide visible changes to navigation elements—links should have a visibly different style when moused over, as should navigation buttons.
Two images for use as a button.
The button is initially displayed in its inactive (off) state.
When the mouse leaves the button, the onmouseout event launches the deactivate function, returning the button display to its inactive state. When the button is clicked, the onclick event changes the location property of the user agent, effectively navigating to a new page (in this case home.html). Note that the
The button is changed to active (on) when the mouse is over it.
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Introducing The Web And Html
What Goes Into A Web Page?
Starting Your Web Page
Lines, Line Breaks, And Paragraphs
Page Layout With Tables
Introducing Cascading Style Sheets
Creating Style Rules
Padding, Margins, And Borders
Colors And Backgrounds
Tables Table Styles
Defining Pages For Printing
Dynamic Html With Css
Introduction To Server-side Scripting
Introduction To Database-driven Web Publishing
Creating A Weblog
Introduction To Xml
Xml Processing And Implementations
Testing And Validating Your Documents
Choosing A Service Provider
Uploading Your Site With Ftp
Publicizing Your Site And Building Your Audience
Maintaining Your Site
The Web Development Process
Developing And Structuring Content
Designing For Usability And Accessibility
Designing For An International Audience
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