js 验证表单 js提交验证类

附加：js验证radio是否选择

<script language="javascript">

function
checkform(obj)

{

for(i=0;i<obj.oo.length;i++)

if(obj.oo[i].checked==true) return true;

alert("请选择")

return false;

}

</script>

<form id="form1" name="form1" method="post"
action="" onsubmit="return checkform(this)">

<input type="radio"
name="oo" value="radiobutton" />

<input type="radio" name="oo"
value="radiobutton" />

<input type="submit" name="Submit" value="提交

" />

</form>

1. 长度限制

<script>

function
test()

{

if(document.a.b.value.length>50)

{

alert("不能超过50个字符！");

document.a.b.focus();

return
false;

}

}

</script>

<form name=a onsubmit="return
test()">

<textarea name="b" cols="40" wrap="VIRTUAL"
rows="6"></textarea>

<input type="submit" name="Submit"
value="check">

</form>

2. 只能是汉字

<input
onkeyup="value="/oblog/value.replace(/[^/u4E00-/u9FA5]/g,'')">

3."
只能是英文

<script language=javascript>

function
onlyEng()

{

if(!(event.keyCode>=65&&event.keyCode<=90))

event.returnvalue=false;

}

</script>

<input
onkeydown="onlyEng();">

4. 只能是数字

<script
language=javascript>

function
onlyNum()

{

if(!((event.keyCode>=48&&event.keyCode<=57)||(event.keyCode>=96&&event.keyCode<=105)))

//考虑小键盘上的数字键

event.returnvalue=false;

}

</script>

<input
onkeydown="onlyNum();">

5. 只能是英文字符和数字

<input
onkeyup="value="/oblog/value.replace(/[/W]/g,"'')
"onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^/d]/g,''))">

6.
[b]验证

油箱格式[/b]

<SCRIPT
LANGUAGE=javascript RUNAT=Server>

function isEmail(strEmail) {

if
(strEmail.search(/^/w+((-/w+)|(/./w+))*/@[A-Za-z0-9]+((/.|-)[A-Za-z0-9]+)*/.[A-Za-z0-9]+$/)
!= -1)

return
true;

else

alert("oh");

}

</SCRIPT>

<input type=text
onblur=isEmail(this.value)>

7.
屏蔽关键字(这里屏蔽***和****)

<script
language="javascript1.2">

function test() {

if((a.b.value.indexOf
("***") == 0)||(a.b.value.indexOf ("****") == 0)){

alert("


");

a.b.focus();

return
false;}

}

</script>

<form name=a onsubmit="return
test()">

<input type=text name=b>

<input type="submit"
name="Submit" value="check">

</form>

8.
两次输入密码是否相同


<FORM METHOD=POST ACTION="">

<input
type="password" id="input1">

<input type="password"
id="input2">

<input type="button" value="test"
onclick="check()">

</FORM>

<script>

function
check()

{

with(document.all){

if(input1.value!=input2.value)

{

alert("false")

input1.value
= "";

input2.value = "";

}

else
document.forms[0].submit();

}

}

</script>

够了吧


屏蔽右键 很酷

oncontextmenu="return false" ondragstart="return
false" onselectstart="return
false"

加在body中

二



2.1
表单项不能为空

<script
language="javascript">

<!--

function
CheckForm()

{

if (document.form.name.value.length == 0)
{

alert("请输入您姓名!");

document.form.name.focus();

return
false;

}

return
true;

}

-->

</script>

2.2
比较两个表单项的值是否相同



<script
language="javascript">

<!--

function CheckForm()

if
(document.form.PWD.value != document.form.PWD_Again.value)
{

alert("您两次输入的密码不一样！请重新输入.");

document.ADDUser.PWD.focus();

return
false;

}

return
true;

}

-->

</script>

2.3
表单项只能为数字和"_",用于电话/银行帐号验证上,可扩展到域名注册等

<script
language="javascript">

<!--

function
isNumber(String)

{

var Letters = "1234567890-";
//可以自己增加可输入值

var i;

var c;

if(String.charAt( 0
)=='-')

return false;

if( String.charAt( String.length
- 1 ) == '-' )

return false;

for( i =
0; i < String.length; i ++ )

{

c =
String.charAt( i );

if (Letters.indexOf( c ) <
0)

return false;

}

return true;

}

function
CheckForm()

{

if(! isNumber(document.form.TEL.value))
{

alert("您的电话号码不合法！");

document.form.TEL.focus();

return
false;

}

return
true;

}

-->

</script>

2.4
表单项输入数值/长度限定

<script
language="javascript">

<!--

function
CheckForm()

{

if (document.form.count.value > 100
|| document.form.count.value <
1)

{

alert("输入数值不能小于零大于100!");

document.form.count.focus();

return
false;

}

if
(document.form.MESSAGE.value.length<10)

{

alert("输入文字小于10!");

document.form.MESSAGE.focus();

return
false;

}

return
true;

}

//-->

</script>

2.5
中文/英文/数字/邮件地址合法性判断



<SCRIPT
LANGUAGE="javascript">

<!--

function isEnglish(name)
//英文值检测

{

if(name.length == 0)

return false;

for(i
= 0; i < name.length; i++)
{

if(name.charCodeAt(i) > 128)

return
false;

}

return true;

}

function isChinese(name)
//中文值检测

{

if(name.length == 0)

return false;

for(i
= 0; i < name.length; i++)
{

if(name.charCodeAt(i) > 128)

return
true;

}

return false;

}

function isMail(name) //
E-mail值检测

{

if(! isEnglish(name))

return false;

i
= name.indexOf(" at ");

j = name dot
lastIndexOf(" at ");

if(i == -1)

return
false;

if(i != j)

return false;

if(i == name
dot length)

return false;

return
true;

}

function isNumber(name)
//数值检测

{

if(name.length == 0)

return false;

for(i
= 0; i < name.length; i++)
{

if(name.charAt(i) < "0" || name.charAt(i) >
"9")

return false;

}

return true;

}

function
CheckForm()

{

if(! isMail(form.Email.value))
{

alert("您的电子邮件不合法！");

form.Email.focus();

return
false;

}

if(! isEnglish(form.name.value))
{

alert("英文名不合法！");

form.name.focus();

return
false;

}

if(! isChinese(form.cnname.value))
{

alert("中文名不合法！");

form.cnname.focus();

return
false;

}

if(! isNumber(form.PublicZipCode.value))
{

alert("邮政编码不合法！");

form.PublicZipCode.focus();

return
false;

}

return
true;

}

//-->

</SCRIPT>

2.6
限定表单项不能输入的字符

<script
language="javascript">

<!--

function
contain(str,charset)// 字符串包含测试函数

{

var
i;

for(i=0;i<charset.length;i++)

if(str.indexOf(charset.charAt(i))>=0)

return
true;

return false;

}

function CheckForm()

{

if
((contain(document.form.NAME.value, "%/(/)><")) ||
(contain(document.form.MESSAGE.value,
"%/(/)><")))

{

alert("输入了非法字符");

document.form.NAME.focus();

return
false;

}

return true;

}

//-->

</script>