When a user visit your website, they do things like click on text and
images and given links, hover over things etc. These are examples of
what JavaScript calls events.
We can write our event handlers in Javascript or vbscript and can
specify these event handlers as a value of event tag attribute. The HTML
4.01 specification defines 19 event attributes as listed below:
<body> and <frameset> Level Events:
There are only two attributes which can be used to trigger any
javascript or vbscript code when there is any event occurs on document
level.
| Attribute |
Value |
Description |
| onload |
script |
Script runs when a HTML document loads |
| onunload |
script |
Script runs when a HTML document unloads |
NOTE: Here script refer to any VBScript or JavaScript function or piece of code.
<form> Level Events:
There are following six attributes which can be used to trigger any
javascript or vbscript code when there is any event occurs on form
level.
| Attribute |
Value |
Description |
| onchange |
script |
Script runs when the element changes
|
| onsubmit |
script |
Script runs when the form is submitted
|
| onreset |
script |
Script runs when the form is reset
|
| onselect |
script |
Script runs when the element is selected
|
| onblur |
script |
Script runs when the element loses focus
|
| onfocus |
script |
Script runs when the element gets focus |
Keyboard Events
There are following three events which are generated by keyboard.
These events are not valid in base, bdo, br, frame, frameset, head,
html, iframe, meta, param, script, style, and title elements.
| Attribute |
Value |
Description |
| onkeydown |
script |
Script runs when key is pressed |
| onkeypress |
script |
Script runs when key is pressed and released |
| onkeyup |
script |
Script runs when key is released |
Other Events:
There following other 7 events which are generated by mouse when it
comes in contact of any HTML tag. These events are not valid in base,
bdo, br, frame, frameset, head, html, iframe, meta, param, script,
style, title elements.
| Attribute |
Value |
Description |
| onclick |
script |
Script runs when a mouse click |
| ondblclick |
script |
Script runs when a mouse double-click |
| onmousedown |
script |
Script runs when mouse button is pressed |
| onmousemove |
script |
Script runs when mouse pointer moves |
| onmouseout |
script |
Script runs when mouse pointer moves out of an element |
| onmouseover |
script |
Script runs when mouse pointer moves over an element |
| onmouseup |
script |
Script runs when mouse button is released |
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