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<html>
<head>
<title>表單輸入驗證執行個體</title>
<script type="text/javascript">
function validate()
{
var userName=document.forms[0].userName.value;
var password=document.forms[0].password.value;
var rePassword=document.forms[0].rePassword.value;
var test=document.forms[1].test;
//得到選項值
var birth=document.forms[0].birth;
alert(birth.options[birth.selectedIndex].text);
if(test)
{
alert(test.value);
}
//Radio button
var sex=document.getElementsByName("sex");
for(var i=0;i<sex.length;i++)
{
if(sex[i].checked==true)
{ alert(sex[i].value);}
}
//checkbox 存到數組中
var habit=document.getElementsByName("habit");
var habits=new Array();
for(var i=0;i<habit.length;i++)
{
if(habit[i].checked==true)
{
alert(habit[i].value);
habits[i]=habit[i].value;
}
}
for (var j=0;j<habits.length ;j++ )
{
alert(habits[j]);
}
//定義變數病將表單的值付給變數其中“//”為Javascript中的注釋。
if(userName.length<=0)
alert("使用者名稱不可為空！");
else if(password<=0)
alert("密碼不可為空！");
else if(rePassword<=0)
alert("重新輸入密碼不可為空！");
else if(userName.length<6)
alert("使用者名稱不能小於6位！");
else if(password!=rePassword)
alert("兩次輸入密碼不一致！");
else
{
alert("驗證通過，表單可以提交！");
document.forms[0].submit();
}
}
</script>
</head>
<body>
<form action="" method="post">
使用者名稱：<input type="text" name="userName"></input><br>
密碼：<input type="text" name="password"></input><br>
請重新輸入密碼：<input type="text" name="rePassword"></input><br>
性別：<input type="radio" name="sex" value="男">男
<input type="radio" name="sex" value="女">女<br>
出生日期：<select name="birth">
<option value="0">--s請選擇--</option>
<option value="1981">1981</option>
<option value="1982">1982</option>
</select>年<br>
興趣：<input name="habit" type="checkbox" value="1">音樂</input>
<input name="habit" type="checkbox" value="2">動漫</input>
<input name="habit" type="checkbox" value="3">電影</input><br>
<input type="button" value="提交" onClick="validate()"></input>
<input type="reset" value="取消"/>
</form>
<form action="" method="post">
<input type="text" name="test"></input>
</form>
</body>
</html>
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