菜鸟学习javascript实例教程(8)
2008-02-23 07:41:41来源：互联网 阅读 ()
</body>
</html>
显示事件发生的类型
<html>
<head>
<script type="text/javascript">
function whichType()
{
alert(event.type)
}
</script>
</head>
<body onmousedown="whichType()">
<p>
Click on the document. An alert box will alert which type of event occurred.
</p>
</body>
</html>
表单对象
用表单显示地址：
<html>
<head>
<script type="text/javascript">
function getAction()
{
var x=document.forms.myForm
alert(x.action)
}
function changeAction()
{
var x=document.forms.myForm
x.action="default.asp"
alert(x.action)
}
</script>
</head>
<body>
<form name="myForm" action="js_examples.asp">
<input type="button" onclick="getAction()" value="View value of action attribute">
<br /><br />
<input type="button" onclick="changeAction()" value="Change value of action attribute">
</form>
</body>
</html>
显示表单所使用的方法
<html>
<head>
<script type="text/javascript">
function formMethod()
{
var x=document.forms.myForm
alert(x.method)
}
</script>
</head>
<body>
<form name="myForm" method="post">
Name: <input type="text" size="20"><br /><br />
<input type="button" onclick="formMethod()" value="Show method">
</form>
</body>
</html>
重置表单
<html>
<head>
<script type="text/javascript">
function formReset()
{
var x=document.forms.myForm
x.reset()
}
</script>
</head>
<body>
<form name="myForm">
<p>Enter some text in the text fields and then press the "Reset form" button</p>
<input type="text" size="20"><br />
<input type="text" size="20"><br />
<br />
<input type="button" onclick="formReset()" value="Reset form">
</form>
</body>
</html>
提交表单
<html>
<head>
<script type="text/javascript">
function formSubmit()
{
document.forms.myForm.submit()
}
</script>
</head>
<body>
<form name="myForm" action="js_form_action.asp" method="get">
Firstname: <input type="text" name="firstname" size="20"><br />
Lastname: <input type="text" name="lastname" size="20"><br /><br />
<input type="button" onclick="formSubmit()" value="Submit">
</form>
</body>
</html>
对email的验证
<html>
<head>
<script type="text/javascript">
function validate()
{
x=document.myForm
at=x.email.value.indexOf("@")
if (at == -1)
{
alert("Not a valid e-mail")
return false
}
}
</script>
</head>
<body>
<form name="myForm" action="tryjs_submitpage.htm" onsubmit="return validate()">
Enter your E-mail:
<input type="text" name="email" size="20">
<input type="submit" value="Submit">
</form>
<p><b>Note:</b> This example ONLY tests if the e-mail address contains an "@" character. A "real-life" code
would have to test for punctuations, spaces and other things as well.</p>
</body>
</html>
输入指定的数才能提交表单
<html>
<head>
<script type="text/javascript">
function validate()
{
x=document.myForm
txt=x.myInput.value
if (txt>=1 && txt<=5)
{
return true
}
else
{
alert("Must be between 1 and 5")
return false
}
}
</script>
</head>
<body>
<form name="myForm" action="tryjs_submitpage.htm" onsubmit="return validate()">
Enter a value from 1 to 5: <input type="text" name="myInput" size="20">
<input type="submit" value="Submit">
</form>
</body>
</html>
输入特定长的字符才能提交表单
<html>
<head>
<script type="text/javascript">
function validate()
{
x=document.myForm
input=x.myInput.value
if (input.length>5)
{
alert("The field cannot contain more than 5 characters!")
return false
}
else
{
return true
}
}
</script>
</head>
<body>
<form name="myForm" action="tryjs_submitpage.htm" onsubmit="return validate()">
Enter some text (you will get a message if you add more than 5 characters):
<input type="text" name="myInput" size="20">
<input type="submit" value="Submit">
</form>
</body>
</html>
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