="text" name="myInput" size="20">
<input type="submit" value="Submit">
</form>
</body>
</html>
对表单的检测
<html>
<head>
<script type="text/javascript">
function validate()
{
x=document.myForm
at=x.email.value.indexOf("@")
code=x.code.value
firstname=x.fname.value
submitOK="True"
if (at==-1)
{
alert("Not a valid e-mail!")
submitOK="False"
}
if (code<1 || code>5)
{
alert("The value must be between 1 and 5")
submitOK="False"
}
if (firstname.length>10)
{
alert("Your name must be less than 10 characters")
submitOK="False"
}
if (submitOK=="False")
{
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"><br />
Enter a value from 1 to 5: <input type="text" name="code" size="20"><br />
Enter your name, max 10 chararcters: <input type="text" name="fname" size="20"><br />
<input type="submit" value="Submit">
</form>
</body>
</html>
设置表单中的一项获得焦点
<html>
<head>
<script type="text/javascript">
function setfocus()
{
document.forms[0].field.focus()
}
</script>
</head>
<body>
<form>
<input type="text" name="field" size="30">
<input type="button" value="Set focus" onclick="setfocus()">
</form>
</body>
</html>
选择文本框中的文本
<html>
<head>
<script type="text/javascript">
function setfocus()
{
document.forms[0].txt.select()
document.forms[0].txt.focus()
}
</script>
</head>
<body>
<form>
<input type="text" name="txt" size="30" value="Hello World!">
<input type="button" value="Select text" onclick="setfocus()">
</form>
</body>
</html>
下拉列表框的取值
<html>
<head>
<script type="text/javascript">
function put()
{
txt=document.forms[0].myList.options[document.forms[0].myList.selectedIndex].text
document.forms[0].favorite.value=txt
}
</script>
</head>
<body>
<form>
Select your favorite browser:
<select name="myList" onchange="put()">
<option>Internet Explorer</option>
<option>Netscape</option>
<option>Opera</option>
</select>
<br /><br />
Your favorite browser is: <input type="text" name="favorite" size="20">
</form>
</body>
</html>
单选按钮的取值
<html>
<head>
<script type="text/javascript">
function check(browser)
{
document.forms[0].answer.value=browser
}
</script>
</head>
<body>
<form>
Select which browser is your favorite:<br /><br />
<input type="radio" name="browser" onclick="check(this.value)" value="Internet Explorer">Internet Explorer<br />
<input type="radio" name="browser" onclick="check(this.value)" value="Netscape">Netscape<br />
<input type="radio" name="browser" onclick="check(this.value)" value="Opera">Opera<br />
<br />
<input type="text" name="answer" size="20">
</form>
</body>
</html>
下拉列表的值的显示
<html>
<head>
<script type="text/javascript">
function put()
{
option=document.forms[0].dropdown.options[document.forms[0].dropdown.selectedIndex].text
txt=document.forms[0].number.value
txt=txt + option
document.forms[0].number.value=txt
}
</script>
</head>
<body>
<form>
Select numbers:<br />
<select name="dropdown">
<option>0</option>
<option>1</option>
<option>2</option>
<option>3</option>
<option>4</option>
<option>5</option>
<option>6</option>
<option>7</option>
<option>8</option>
<option>9</option>
</select>
<input type="button" onclick="put()" value="-->">
<input type="text" name="number" size="20">
</form>
</body>
</html>
下拉列表的连接
<html>
<head>
<script type="text/javascript">
function go(form)
{
location=form.selectmenu.value
}
</script>
</head>
<body>
<form>
<select name="selectmenu" onchange="go(this.form)">
<option>--Select page--</option>
<option value="Microsofthttp://www.microsoft.com">Microsoft</option>
<option value="AltaVistahttp://www.altavista.com">AltaVista</option>
<option value="W3Schoolshttp://www.w3schools.com">W3Schools</option>
</select>
</form>
</body>
</html>
光标自动跳到下一个文本区
<html>
<head>
<script type="text/javascript">
function toUnicode(elmnt,content)
{
if (content.length==elmnt.maxLength)
{
next=elmnt.tabIndex
if (next<document.forms[0].elements.length)
{
document.forms[0].elements[next].focus()
}
}
}
</script>
</head>
<body>
<p>This script automatically jumps to the next input field when the current field's maxlength has been reached.</p>
<form>
<input size="3" tabindex="1" maxlength="3" onkeyup="toUnicode(this,this.value)">
<input size="3" tabindex="2" maxlength="3" onkeyup="toUnicode(this,this.value)">
<input size="3" tabindex="3" maxlength="3" onkeyup="toUnicode(this,this.value)">
</form>
</body>
</html>
Frame, Frameset 和 IFrame 对象
平分两个页面
<html>
<frameset id="myFrameset" cols="50%,50%">
<frame id="leftFrame" src="frame_a_noresize.htm">
<frame id="rightFrame" src="frame_a.htm">
</frameset>
</html>
<html>
<head>
<script type="text/javascript">
function disableResize()
{
parent.document.getElementById("leftFrame").noResize=true
parent.document.getElementById("rightFrame").noResize=true
}
function enableResize()
{
parent.document.getElementById("leftFrame").noResize=false
parent.document.getElementById("rightFrame").noResize=false
}
</script>
</head>
<body bgcolor="#EFE7D6">
<form>
<input type="button" onclick="disableResize()" value="No resize">
<input type="button" onclick="enableResize()" value="Resize">
</form>
<p>Try to resize the frame.</p>
<p>Right-click inside the two frames and select "View Source" to see the source code.</p>
</body>
</html>
是否显示滚动条
<html>
<frameset id="myFrameset" cols="50%,50%">
<frame id="leftFrame" src="frame_a_scrolling.htm">
<frame id="rightFrame" src="frame_a.htm">
</frameset>
</html>
<html>
<head>
<script type="text/javascript">
function enableScrolling()
{
parent.document.getElementById("leftFrame").scrolling="yes"
parent.document.getElementById("rightFrame").scrolling="yes"
}
function disableScrolling()
{
parent.document.getElementById("leftFrame").scrolling="no"
parent.document.getElementById("rightFrame").scrolling="no"
}
</script>
</head>
<body bgcolor="#EFE7D6">
<form>
<input type="button" onclick="enableScrolling()" value="Scroll bars">
<input type="button" onclick="disableScrolling()" value="No scroll bars">
</form>
<p>Right-click inside the frames and select "View Source" to see the source code.</p>
</body>
</html>
改变页面的地址：
<html>
<frameset id="myFrameset" cols="50%,50%">
<frame id="leftFrame" src="frame_a_src.htm">
<frame id="rightFrame" src="frame_a.htm">
</frameset>
</html>
<html>
<head>
<script type="text/javascript">
function newSrc()
{
parent.document.getElementById("leftFrame").src="default.asp"
parent.document.getElementById("rightFrame").src="http://www.w3schools.com"
}
</script>
</head>
<body bgcolor="#EFE7D6">
<form>
<input type="button" onclick="newSrc()" value="Change frame source">
</form>
<p>Right-click inside the two frames and select "View Source" to see the source code.</p>
</body>
</html>
跳出框架
<html>
<head>
<script type="text/javascript">
function breakout()
{
if (window.top!=window.self)
{
window.top.location="tryjs_breakout.htm"
}
}
</script>
</head>
<body>
<form>
Click the button to break out of the frame:
<input type="button" onclick="breakout()" value="Break out!">
</form>
</body>
</html>
更新两个页面
<html>
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