<script language="JavaScript">
//設(shè)置焦點(diǎn)函數(shù)
function focusElement(formName, elemName) {
var elem = document.forms[formName].elements[elemName];
elem.focus( );
elem.select( );
}
// 驗(yàn)證下拉框
function isChosen(select){
if (select.selectedIndex==0) {
alert("請(qǐng)選擇下拉單相應(yīng)欄目.");
focusElement(select.form.name,select.name);
return false;
} else {
return true;
}
}
//不為空函數(shù)
function isNotEmpty(elem) {
var str=elem.value;
if(str==null || str.length==0) {
alert("此項(xiàng)不能為空");
focusElement(elem.form.name,elem.name);
return false;
} else {
return true;
}
}
// 驗(yàn)證是否是數(shù)字
function isNumber(elem) {
var str=elem.value;
var oneDecimal=false;
var oneChar=0;
str=str.toString( );
for (var i=0; i<str.length; i++) {
oneChar=str.charAt(i).charCodeAt(0);
// -
if (oneChar==45) {
if (i==0) {
continue;
} else {
alert("Only the first character may be a minus sign.");
setTimeout("focusElement('" + elem.form.name + "', '" + elem.name + "')", 0);
return false;
}
}
// 小數(shù)點(diǎn)
if (oneChar==46) {
if (!oneDecimal) {
oneDecimal=true;
continue;
} else {
alert("輸入的數(shù)字只允許有一個(gè)小數(shù)點(diǎn).");
setTimeout("focusElement('" + elem.form.name + "', '" + elem.name + "')", 0);
return false;
}
}
// 數(shù)字只能在0和9之間
if (oneChar<48 || oneChar > 57) {
alert("此項(xiàng)只能輸入數(shù)字.");
setTimeout("focusElement('" + elem.form.name + "', '" + elem.name + "')", 0);
return false;
}
}
return true;
}
// 驗(yàn)證是否是數(shù)字電話
function istel(elem) {
var str=elem.value;
var oneDecimal=false;
var oneChar=0;
str=str.toString( );
for (var i=0; i<str.length; i++) {
oneChar=str.charAt(i).charCodeAt(0);
if(oneChar==45){continue;}
if(oneChar<48 || oneChar > 57) {
alert("此項(xiàng)只能輸入數(shù)字和'-'號(hào).");
setTimeout("focusElement('" + elem.form.name + "', '" + elem.name + "')", 0);
return false;
}
}
return true;
}
//驗(yàn)證輸入數(shù)據(jù)的長(zhǎng)度
//郵編
function isLenMatch(elem,lengthNum) {
var str=elem.value;
if (str.length != lengthNum) {
alert("此項(xiàng)內(nèi)容長(zhǎng)度只能為"+lengthNum+"位.");
setTimeout("focusElement('" + elem.form.name + "', '" + elem.name + "')", 0);
return false;
} else {
return true;
}
}
//郵件地址驗(yàn)證
function isEMailAddr(elem) {
var str = elem.value;
var re = /^[\w-]+(\.[\w-]+)*@([\w-]+\.)+[a-zA-Z]{2,7}$/;
if (!str.match(re)) {
alert("您輸入的不是有效的e-mail地址.");
setTimeout("focusElement('" + elem.form.name + "', '" + elem.name + "')", 0);
return false;
} else {
return true;
}
}
//單選按鈕驗(yàn)證
function isValidRadio(radio) {
var valid=false;
for (var i=0; i<radio.length; i++) {
if (radio.checked) {
return true;
}
}
alert("單選按鈕未選中.");
radio[0].focus();
//setTimeout("focusElement('" + radio[0].form.name + "', '" + radio[0].name + "')", 0);
focusElement(radio[0].form.name,radio[0].name);
return false;
}
</script>
<script language="JavaScript">
function validateForm(form) {
if (isNotEmpty(form.name1) && isNotEmpty(form.name2)) {;}else{return false;
}
</script>
<title>JS驗(yàn)證程序Sample</title></head>
<body>
<form method="GET" action="index.htm" name="sampleForm" onsubmit="return validateForm(this)">
<p>姓名:
<input type="text" size="30" name="name1" id="name1" />
</body>
</html>
表單驗(yàn)證 很有用
長(zhǎng)度限制
<script>
function test()
{
if(document.a.b.value.length>50)
{
alert("不能超過50個(gè)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=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(shù)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(shù)字鍵
event.returnvalue=false;
}
</script>
<input onkeydown="onlyNum();">
5 只能是英文字符和數(shù)字
<input onkeyup="value=value.replace(/[\W]/g,'') "onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\d]/g,''))">
6 驗(yàn)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(guān)鍵字(這里屏蔽sex和****)
<script language="javascript1.2">
function test() {
if((a.b.value.indexOf ("sex") == 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>
網(wǎng)頁(yè)表單的javascript集成驗(yàn)證方法舉例
原理：
表單驗(yàn)證無非是要對(duì)要收集每一條信息進(jìn)行驗(yàn)證，也就是要寫一個(gè)名為
frmValid的javascript函數(shù)，在其中執(zhí)行如下操作：
...
if (待驗(yàn)證條目 不符合條件)
{
alert('出錯(cuò)了!');
待驗(yàn)證條目.focus();
return false;
}
...
// all right
return true;
當(dāng)然，<form ... onsubmit='return frmValid()'>必須包含在
HTML代碼中。想想看，待驗(yàn)證條目越多代碼越長(zhǎng)，也就越容易出錯(cuò)。
下面我們把驗(yàn)證條目放到一個(gè)數(shù)組里，如下：
elemArray = new Array(
'待驗(yàn)證條目名',
'驗(yàn)證條件',
'出錯(cuò)提示');
那么驗(yàn)證代碼將大大精簡(jiǎn)，我們只要如下使用循環(huán)就可實(shí)現(xiàn)上述冗長(zhǎng)
代碼時(shí)下的功能，這里我們用with和eval語句構(gòu)造判斷條件：
with(eval('obj.'+elems[0]))
{
if(eval(elems[1]))
{
window.alert(elems[2]);
focus();
return false;
}
}
我們建立多位數(shù)組就可實(shí)現(xiàn)循環(huán)遍歷每個(gè)條目：
elems = new Array(
new Arrary( ...),
...
);
for(i = 0; i < elems.length; i++)
{
// 上面的驗(yàn)證語句
}
實(shí)戰(zhàn)：
1、使用如下例子編寫驗(yàn)證腳本：
<SCRIPT LANGUAGE="javascript" type="text/javascript">
//
// Function: frmValid
// ------------------
// Author hongz
// Usage: YourForm.onsbumit="return frmValid(this)".
// Purpose: To validate form elements in an integrated way.
//
function frmValid(obj)
{
// Elements array, initialization for validation
elems = new Array(
new Array(
'username', // name of elements to be validated
'value.length<1 || value.search(/[^a-zA-z0-9_]/)>=0',
// validation condition
'無效的用戶名:只能輸入6-20位字母、數(shù)字、下劃線的組合!'),
// prompt on failure
new Array(
'password',
'value.length<5 || value.search(/[^a-zA-z0-9_]/)>=0',
'無效的密碼:只能輸入6-20位字母、數(shù)字、下劃線的組合!'),
new Array(
'email',
'isMail(value)==false',
'Email是您在網(wǎng)上的重要聯(lián)絡(luò)工具,請(qǐng)務(wù)必正確填寫!')
);
// Validate here, using eval statement.
for(i = 0; i < elems.length; i++)
{
with(eval('obj.'+elems[0]))
{
if(eval(elems[1]))
{
window.alert(elems[2]);
focus();
return false;
}
}
}
return true;
}
//-->
</SCRIPT>
2、為form添加onsubmit屬性：
<form ... onsubmit='return frmValid(this)'>
Javascript客戶端驗(yàn)證代碼
代碼:
--------------------------------------------------------------------------------
<SCRIPT language=JavaScript><!--
function passwordt(theForm){
if (theForm.user_name.value == ""){
alert("登錄用戶名不能為空，請(qǐng)重新填寫！");
theForm.user_name.focus();
return (false);
}
if (theForm.user_pass.value == ""){
alert("登錄密碼不能為空，請(qǐng)重新填寫！");
theForm.user_pass.focus();
return (false);
}
if (theForm.user_pass.value.length < 3){
alert("登錄密碼不能少于3個(gè)字符，請(qǐng)重新填寫！");
theForm.user_pass.focus();
return (false);
}
if (theForm.re_password.value == ""){
alert("確認(rèn)新密碼不能為空，請(qǐng)重新填寫！");
theForm.re_password.focus();
return (false);
}
if (theForm.re_password.value.length < 3){
alert("確認(rèn)新密碼不能少于3個(gè)字符，請(qǐng)重新填寫！");
theForm.re_password.focus();
return (false);
}
if (theForm.user_pass.value != theForm.re_password.value){
alert("新密碼和確認(rèn)新密碼不同，請(qǐng)重新填寫！");
theForm.user_pass.focus();
return (false);
}
if (theForm.user_namec.value=="") {
alert ('請(qǐng)?zhí)顚懶彰?);
theForm.user_namec.focus();
return false;
}
if ((!theForm.user_sex(0).checked)&&(!theForm.user_sex(1).checked)){
alert ('請(qǐng)選擇用戶性別！');
theForm.user_sex(0).focus();
return false;
}
if ((theForm.user_birth_year.value == "")||(fucCheckNUM(theForm.user_birth_year.value)==0)||(theForm.user_birth_year.value.length!=4)||((theForm.user_birth_year.value <1900) || (theForm.user_birth_year.value >2002 ) )) {
alert("請(qǐng)?zhí)顚懻_的出生年份！");
theForm.user_birth_year.focus();
return (false);
}
if (theForm.user_birth_month.value=="0"){
alert("請(qǐng)選擇出生月份！");
theForm.user_birth_month.focus();
return (false);
}
if (theForm.user_birth_day.value=="0"){
alert("請(qǐng)選擇出生日期！");
theForm.user_birth_day.focus();
return (false);
}
if ((theForm.user_birth_month.value=="2") && (theForm.user_birth_day.value>29)){
alert("請(qǐng)選擇正確的出生日期！");
theForm.user_birth_month.focus();
return (false);
}
if (((theForm.user_birth_month.value=="4")||(theForm.user_birth_month.value=="6")||(theForm.user_birth_month.value=="9")||(theForm.user_birth_month.value=="11")) && (theForm.user_birth_day.value==31)){
alert("請(qǐng)選擇正確的出生日期！");
theForm.user_birth_month.focus();
return (false);
}
if (theForm.user_country.value=="") {
alert("請(qǐng)選擇所在國(guó)家！");
theForm.user_country.focus();
return (false);
}
if (theForm.user_city.value =="") {
alert("請(qǐng)選擇城市！");
theForm.user_city.focus();
return (false);
}
if (theForm.user_adds.value == "" ){
alert("家庭住址不能為空，請(qǐng)重新填寫！");
theForm.user_adds.focus();
return (false);
}
if (theForm.user_postcode.value == "" ) {
alert("郵政編碼不能為空，請(qǐng)重新填寫！");
theForm.user_postcode.focus();
return (false);
}
if (theForm.user_tel.value == "" ) {
alert("郵政編碼不能為空，請(qǐng)重新填寫！");
theForm.user_tel.focus();
return (false);
}
if (theForm.user_mail.value=="") {
alert("請(qǐng)?zhí)顚慐MAIL！");
theForm.user_mail.focus();
return (false);
}
if ((theForm.user_mail.value!="") && (chkemail(theForm.user_mail.value)==0)) {
alert("EMAIL格式不對(duì)，請(qǐng)重新填寫！");
theForm.user_mail.focus();
return (false);
}
return (true);
}
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;
}
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) {
return 0;
}
}
return 1;
}
function chg_nation(nation){
if (nation!='cn'){
ini_province(nation);
document.user_form.selProvince.disabled = true;
document.user_form.selProvince.value="國(guó)外城市";
document.user_form.selCity.value="國(guó)外城市";
}else{
ini_province(nation);
document.user_form.selProvince.disabled = false;
document.user_form.selProvince.value="0";
document.user_form.selCity.value="";
}
}
function chg_province(province){
obj=document.getElementById("list_city");
obj.src="list_city.php?province="+province;
}
//-->
</SCRIPT>