js驗證表單大全
1. 長度限制
<script>
function test()
{
if(document.a.b.value.length>50)
{
alert("不能超過50個字符！");
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. 只能是漢字
<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. 只能是數字
<script language=javascript>
function onlyNum()
{
if(!((event.keyCode>=48&&event.keyCode<=57)||(event.keyCode>=96&&event.keyCode<=105)))
//考慮小鍵盤上的數字鍵
event.returnvalue=false;
}
</script>

<input onkeydown="onlyNum();">
或者

<input type="text" onkeypress="if (event.keyCode < 45 || event.keyCode > 57) event.returnValue = false;"/>
或者:
<input?? onkeyup="if(event.keyCode?? !=37?? &&?? event.keyCode?? !=?? 39)?? value=value.replace(/\D/g,'');"onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/\D/g,''))">
5. 只能是英文字符和數字
<input onkeyup="value="/oblog/value.replace(/[\W]/g,"'') "onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\d]/g,''))">

6. 驗證油箱格式
<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. 屏蔽關鍵字(這里屏蔽***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. 兩次輸入密碼是否相同
<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>
夠了吧
屏蔽右鍵 很酷
oncontextmenu="return false" ondragstart="return false" onselectstart="return false"
加在body中


二

2.1????? 表單項不能為空

<script????? language="javascript">
<!--
function????? CheckForm()
{?
if????? (document.form.name.value.length????? ==????? 0)????? {?
alert("請輸入您姓名!");
document.form.name.focus();
return????? false;
}
return????? true;
}
-->
</script>

2.2????? 比較兩個表單項的值是否相同

<script????? language="javascript">
<!--
function????? CheckForm()
if????? (document.form.PWD.value????? !=????? document.form.PWD_Again.value)????? {?
alert("您兩次輸入的密碼不一樣！請重新輸入.");
document.ADDUser.PWD.focus();
return????? false;
}
return????? true;
}
-->
</script>

2.3????? 表單項只能為數字和"_",用于電話/銀行帳號驗證上,可擴展到域名注冊等

<script????? language="javascript">
<!--
function????? isNumber(String)
{?
var????? Letters????? =????? "1234567890-";????? //可以自己增加可輸入值
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("您的電話號碼不合法！");
document.form.TEL.focus();
return????? false;
}
return????? true;
}
-->
</script>


2.4????? 表單項輸入數值/長度限定

<script????? language="javascript">
<!--
function????? CheckForm()?
{?
if????? (document.form.count.value????? >????? 100????? ||????? document.form.count.value????? <????? 1)
{?
alert("輸入數值不能小于零大于100!");
document.form.count.focus();
return????? false;
}
if????? (document.form.MESSAGE.value.length<10)
{?
alert("輸入文字小于10!");
document.form.MESSAGE.focus();
return????? false;
}
return????? true;
}
//-->
</script>

2.5????? 中文/英文/數字/郵件地址合法性判斷

<SCRIPT????? LANGUAGE="javascript">
<!--

function????? isEnglish(name)????? //英文值檢測
{?
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)????? //中文值檢測
{?
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值檢測
{?
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)????? //數值檢測
{?
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("您的電子郵件不合法！");
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("郵政編碼不合法！");
form.PublicZipCode.focus();
return????? false;
}
return????? true;
}
//-->
</SCRIPT>

2.6????? 限定表單項不能輸入的字符

<script????? language="javascript">
<!--

function????? contain(str,charset)//????? 字符串包含測試函數
{?
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("輸入了非法字符");
document.form.NAME.focus();
return????? false;
}
return????? true;
}
//-->
</script>?

1. 檢查一段字符串是否全由數字組成??????
---------------------------------------??????
<script language="Javascript"><!--??????????
function checkNum(str){return str.match(/\D/)==null}??????????
alert(checkNum("1232142141"))??????????
alert(checkNum("123214214a1"))??????????
// --></script>????????
?????
2. 怎么判斷是否是字符????????
---------------------------------------??????
if (/[^\x00-\xff]/g.test(s)) alert("含有漢字");?????????
else alert("全是字符");?????
??????????
3. 怎么判斷是否含有漢字???????
---------------------------------------???????
if (escape(str).indexOf("%u")!=-1) alert("含有漢字");????????
else alert("全是字符");??????????
???
4. 郵箱格式驗證???
---------------------------------------?????
//函數名：chkemail????
//功能介紹：檢查是否為Email Address????
//參數說明：要檢查的字符串????
//返回值：0：不是 1：是????
function chkemail(a)????
{ var i=a.length;????
var temp = a.indexOf('@');????
var tempd = a.indexOf('.');????
if (temp > 1) {????
if ((i-temp) > 3){????
if ((i-tempd)>0){????
return 1;????
}????
???
}????
}????
return 0;????
}????
???
5. 數字格式驗證???
---------------------------------------?????
//函數名：fucCheckNUM????
//功能介紹：檢查是否為數字????
//參數說明：要檢查的數字????
//返回值：1為是數字，0為不是數字????
function fucCheckNUM(NUM)????
{????
var i,j,strTemp;????
strTemp="0123456789";????
if ( NUM.length== 0)????
return 0????
for (i=0;i<NUM.length;i++)????
{????
j=strTemp.indexOf(NUM.charAt(i));????
if (j==-1)????
{????
//說明有字符不是數字????
return 0;????
}????
}????
//說明是數字????
return 1;????
}????
???
6. 電話號碼格式驗證???
---------------------------------------?????
//函數名：fucCheckTEL????
//功能介紹：檢查是否為電話號碼????
//參數說明：要檢查的字符串????
//返回值：1為是合法，0為不合法????
function fucCheckTEL(TEL)????
{????
var i,j,strTemp;????
strTemp="0123456789-()# ";????
for (i=0;i<TEL.length;i++)????
{????
j=strTemp.indexOf(TEL.charAt(i));????
if (j==-1)????
{????
//說明有字符不合法????
return 0;????
}????
}????
//說明合法????
return 1;????
}???
??
7. 判斷輸入是否為中文的函數??
---------------------------------------?????
function ischinese(s){??
var ret=true;??
for(var i=0;i<s.length;i++)??
ret=ret && (s.charCodeAt(i)>=10000);??
return ret;??
}???
??
8. 綜合的判斷用戶輸入的合法性的函數?
---------------------------------------?????
<script language="javascript">?
//限制輸入字符的位數開始?
//m是用戶輸入，n是要限制的位數?
function issmall(m,n)?
{?
if ((m<n) && (m>0))?
????? {?
????? return(false);?
????? }?
else?
{return(true);}?
}?
?
9. 判斷密碼是否輸入一致?
---------------------------------------?????
function issame(str1,str2)?
{?
if (str1==str2)?
{return(true);}?
else?
{return(false);}?
}?
?
10. 判斷用戶名是否為數字字母下滑線
---------------------------------------?????
function notchinese(str){
var reg=/[^A-Za-z0-9_]/g
??????? if (reg.test(str)){
??????? return (false);
??????? }else{
return(true);??????? }
}

11. form文本域的通用校驗函數
---------------------------------------?????
作用：檢測所有必須非空的input文本，比如姓名，賬號，郵件地址等等。
該校驗現在只針對文本域，如果要針對form里面的其他域對象，可以改變判斷條件。

使用方法：在要檢測的文本域中加入title文字。文字是在提示信息，你要提示給用戶的該字段的中文名。比如要檢測用戶名
html如下<input name="txt_1" title="姓名">,當然，最好用可視化工具比如dreamweaver什么的來編輯域。
如果要檢測數字類型數據的話，再把域的id統一為sz.
javascript判斷日期類型比較麻煩，所以就沒有做日期類型校驗的程序了.高手可以補充。

程序比較草，只是提供一個思路。拋磚引玉！ ：）
哦，對了，函數調用方法：< form????? onsubmit="return dovalidate()">

function dovalidate()
{
fm=document.forms[0] //只檢測一個form,如果是多個可以改變判斷條件
??????? for(i=0;i<fm.length;i++)
??????? {?
??????? //檢測判斷條件，根據類型不同可以修改
??????? if(fm[i].tagName.toUpperCase()=="INPUT" &&fm[i].type.toUpperCase()=="TEXT" && (fm[i].title!=""))
???
???????????? if(fm[i].value="/blog/="")//
???????????? {
???????????? str_warn1=fm[i].title+"不能為空!";
???????????? alert(str_warn1);
??????????? fm[i].focus();
???????????? return false;????????
???????????? }
???????????? if(fm[i].id.toUpperCase()=="SZ")//數字校驗
???????????? {
???????????????????? if(isNaN(fm[i].value))
??????????????????? { str_warn2=fm[i].title+"格式不對";
??????????????????? alert(str_warn2);
??????????????????? fm[i].focus();
???????????????????? return false;
???????????????????? }
??????????? }
??????? }
??????? return true;
}


2 >表單提交驗證類


2.1 表單項不能為空

<script language="javascript">
<!--
function CheckForm()
{
if (document.form.name.value.length == 0) {
alert("請輸入您姓名!");
document.form.name.focus();
return false;
}
return true;
}
-->
</script>

2.2 比較兩個表單項的值是否相同

<script language="javascript">
<!--
function CheckForm()
if (document.form.PWD.value != document.form.PWD_Again.value) {
alert("您兩次輸入的密碼不一樣！請重新輸入.");
document.ADDUser.PWD.focus();
return false;
}
return true;
}
-->
</script>

2.3 表單項只能為數字和"_",用于電話/銀行帳號驗證上,可擴展到域名注冊等

<script language="javascript">
<!--
function isNumber(String)
{
var Letters = "1234567890-"; //可以自己增加可輸入值
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("您的電話號碼不合法！");
document.form.TEL.focus();
return false;
}
return true;
}
-->
</script>


2.4 表單項輸入數值/長度限定

<script language="javascript">
<!--
function CheckForm()
{
if (document.form.count.value > 100 || document.form.count.value < 1)
{
alert("輸入數值不能小于零大于100!");
document.form.count.focus();
return false;
}
if (document.form.MESSAGE.value.length<10)
{
alert("輸入文字小于10!");
document.form.MESSAGE.focus();
return false;
}
return true;
}
//-->
</script>

2.5 中文/英文/數字/郵件地址合法性判斷

<SCRIPT LANGUAGE="javascript">
<!--

function isEnglish(name) //英文值檢測
{
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) //中文值檢測
{
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值檢測
{
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) //數值檢測
{
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("您的電子郵件不合法！");
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("郵政編碼不合法！");
form.PublicZipCode.focus();
return false;
}
return true;
}
//-->
</SCRIPT>

2.6 限定表單項不能輸入的字符

<script language="javascript">
<!--

function contain(str,charset)// 字符串包含測試函數
{
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("輸入了非法字符");
document.form.NAME.focus();
return false;
}
return true;
}
//-->
</script>

js 驗證大全