o_19m7st4t316nvv6a1bg63l10e4a.pdf

double-click.
onmouseover. Runs when the mouse pointer is over a certain part of the
page.
onkeypress. Runs when you press a specific key on the keyboard.
onchange. Runs when the contents of part of a form changes.
onblur. Runs when you press the tab key to switch between part of a form.
onsubmit. Runs when the form's submit button is pressed.
What are these events useful for? All sorts of things. The onmouseover
function, for example, can be used to rewrite parts of the page's code when
the user hovers over something – useful for providing pop-up help 'tooltips'.
Onkeypress lets you give the user keyboard shortcuts to do things on your
web page. Onblur and onsubmit can be used very effectively to spot errors
in a user's form input, and let the user know how to correct them before
they're ever even sent back to the server.
Once you know which event you want to tie some JavaScript to, you have to
say so in your code. You can do this in one of two ways. The first way is to
directly attach it to the HTML element in question, like this:
This works well, but has the disadvantage of polluting your HTML with
JavaScript function names. The second, better, way, is to do it like this in the
JavaScript itself:
onload = function() { }
This creates a function directly from an event (in this case, the onload event),
without ever touching the HTML itself.
JavaScript Commands.
Here's a quick reference to the most useful commands in JavaScript.
The Web Design Guide for Newbies |78