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onunload event
EVENT: onload
onload="action"
The
onload
event occurs when the HTML document is loaded into a window for viewing. When the event happens, the code calls a function that performs a desired action. For example, you may want an alert box to appear that provides useful information to the user.
It can be used with either the
body
or
frameset
tags.
In contrast, the
onunload
event occurs just before the HTML document is unloaded or removed from viewing.
In this form example, the
onload
event is used in the
body
tag to set the focus to the Full Name input box.
Code:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>DevGuru Test Form</title>
<script type="text/javascript">
function checksubmit()
{
if (document.formname.fullname.value == "")
{
alert("Please enter your full name")
document.formname.fullname.focus()
return false
}
if (document.formname.emailaddress.value == "")
{
alert("Please enter your email address")
document.formname.emailaddress.focus()
return false
}
return true
}
</script>
</head>
<body
onload="document.formname.fullname.focus()"
>
<b>
FORM EXAMPLE
<br /><br />
Please leave one or both of the required fields blank and click the submit button.
</b>
<br />
<hr />
<br />
If you wish to receive information about upgrades to dgCharge,<br />
please fill out this form.
<br /><br />
<form method="post" name="formname" action="html_form_example.asp" onsubmit="return checksubmit()">
Full Name (required)
<input type="text" name="fullname" size="30" />
<br /><br />
Email Address (required)
<input type="text" name="emailaddress" size="30" />
<br /><br />
Phone Number (optional)
<input type="text" name="phonenumber" size="15" />
<br /><br />
<input type="submit" name="submitbtn" value="Submit" />
<input type="reset" value="Clear" />
</form>
</body>
</html>
Output:
Click to view the form example in a separate window
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