Alert boxes could be used to help users find mistakes, warn
them of hazards, or to display a status of events.
1) View Alert Box
Click here
to see an alert!
Here is the source code:
<a href="#" onclick="alert('This
is an alert')">Click here to see an alert!</a>
You could also use the onclick="alert("bla
bla")" or the onChange="alert("bla
bla")" inside form elements like buttons
and pulldown menus.
2) Other Options:
You can also alert users before they enter your site by
placing the "alert"
inside the body tag like so:
<body onload="alert('Warning:
this site is crazy.')">
3) Confirm: Yes or Cancel Alert:
JavaScript provides a function called confirm. This generates
an alert box with two buttons, asking "Yes" or
"Cancel". To create this alert we define our own
function in the head of a document:
[Start of Code]
<script language="javascript"
type="text/javascript">
<!--
function alertURL(url) {
if(confirm("Are you sure you want to click this link"))
{
location=url
}
}
//-->
</script>
<!-- The new function "alertURL()"
is called once the link (below) is clicked. Notice that
the url address below is located inside the brackets. This
is then passed to our function and handled by the javascript
"location" statement
if the user clicks yes: -->
<a href="#" onClick="alertURL('fake_page.html')">Click
Here!</a>
[End of Code]
This could be used to persuade users to stay on the page
they are visiting. Or if the link was directed to a server
side program that would execute code that was unchangeable
(ex: delete a file or update data), this would be a safe
guard.
4) Confirm: Form Submissions Yes or No
Alert
You can also use it on a form submission. This is easy.
Just add the following code to your "form" tab:
[Code]
<form action="" method="get"
onsubmit="return confirm('Are
you sure?')">
[End of Code]
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Comments
Suneetha
02.06.2008