一個注冊框 進行表單驗證處理
如圖

有簡單的驗證提示功能
代碼思路也比較簡單
輸入框失去焦點時便檢測,並進行處理
表單具有 onsubmit = "return check()"行為,處理驗證情況
點擊提交表單按鈕時,進行最終的驗證,達到是否通過表單提交的請求。
先是最基本的html+css部分
<style type="text/css">
body{margin:0;padding: 0;}
.login{position:relative;margin:100px auto;padding:50px 20px;width: 350px;height: 200px;border:1px solid #333;}
.login legend{font-weight: bold;color: green;text-align: center;}
.login label{display:inline-block;width:130px;text-align: right;}
.btn{height: 30px;width:100px;padding: 5px;border:0;background-color: #00dddd;font-weight: bold;cursor: pointer;float: right;}
input{height: 20px;width: 170px;}
.borderRed{border: 2px solid red;}
img{display: none;}
</style>
</head>
<body>
<div class="login">
<form name="form" method="post" action="register.php" onsubmit="return check()">
<legend>【Register】</legend>
<p><label for="name">UserName: </label>
<input type="text" id="name" >
<img src="./img/gou.png" width="20px" height="20px"></p>
<p><label for="password">Password: </label>
<input type="password" id="password" >
<img src="./img/gantan.png" width="20px" height="20px"></p>
<p><label for="R_password">Password Again: </label>
<input type="password" id="R_password" >
<img src="./img/gou.png" width="20px" height="20px"></p>
<p><label for="email">Email: </label>
<input type="text" id="email" >
<img src="./img/gou.png" width="20px" height="20px"></p>
<p><input type="submit" value="Register" class="btn"></p>
</form>
</div>
然後是js的class相關處理函數
function hasClass(obj,cls){ // 判斷obj是否有此class
return obj.className.match(new RegExp('(\\s|^)' + cls + '(\\s|$)'));
}
function addClass(obj,cls){ //給 obj添加class
if(!this.hasClass(obj,cls)){
obj.className += " "+cls;
}
}
function removeClass(obj,cls){ //移除obj對應的class
if(hasClass(obj,cls)){
var reg = new RegExp('(\\s|^)' + cls + '(\\s|$)');
obj.className = obj.className.replace(reg," ");
}
}
然後是驗證各個輸入框的值
function checkName(name){ //驗證name
if(name != ""){ //不為空則正確,當然也可以ajax異步獲取服務器判斷用戶名不重復則正確
removeClass(ele.name,"borderRed"); //移除class
document.images[0].setAttribute("src","./img/gou.png"); //對應圖標
document.images[0].style.display = "inline"; //顯示
return true;
}else{ //name不符合
addClass(ele.name,"borderRed"); //添加class
document.images[0].setAttribute("src","./img/gantan.png"); //對應圖標
document.images[0].style.display = "inline"; //顯示
return false;
}
}
function checkPassw(passw1,passw2){ //驗證密碼
if(passw1 == "" || passw2 == "" || passw1 !== passw2){ //兩次密碼輸入不為空且不等 不符合
addClass(ele.password,"borderRed");
addClass(ele.R_password,"borderRed");
document.images[1].setAttribute("src","./img/gantan.png");
document.images[1].style.display = "inline";
document.images[2].setAttribute("src","./img/gantan.png");
document.images[2].style.display = "inline";
return false;
}else{ //密碼輸入正確
removeClass(ele.password,"borderRed");
removeClass(ele.R_password,"borderRed");
document.images[1].setAttribute("src","./img/gou.png");
document.images[1].style.display = "inline";
document.images[2].setAttribute("src","./img/gou.png");
document.images[2].style.display = "inline";
return true;
}
}
function checkEmail(email){ //驗證郵箱
var pattern = /^([\.a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+(\.[a-zA-Z0-9_-])+/;
if(!pattern.test(email)){ //email格式不正確
addClass(ele.email,"borderRed");
document.images[3].setAttribute("src","./img/gantan.png");
document.images[3].style.display = "inline";
ele.email.select();
return false;
}else{ //格式正確
removeClass(ele.email,"borderRed");
document.images[3].setAttribute("src","./img/gou.png");
document.images[3].style.display = "inline";
return true;
}
}
然後為各個輸入框添加監聽事件:
var ele = { //存放各個input字段obj
name: document.getElementById("name"),
password: document.getElementById("password"),
R_password: document.getElementById("R_password"),
email: document.getElementById("email")
};
ele.name.onblur = function(){ //name失去焦點則檢測
checkName(ele.name.value);
}
ele.password.onblur = function(){ //password失去焦點則檢測
checkPassw(ele.password.value,ele.R_password.value);
}
ele.R_password.onblur = function(){ //R_password失去焦點則檢測
checkPassw(ele.password.value,ele.R_password.value);
}
ele.email.onblur = function(){ //email失去焦點則檢測
checkEmail(ele.email.value);
}
最後就是點擊提交注冊時調用的check()函數了
function check(){ //表單提交則驗證開始
var ok = false;
var nameOk = false;
var emailOk = false;
var passwOk = false;
if(checkName(ele.name.value)){ nameOk = true; } //驗證name
if(checkPassw(ele.password.value,ele.R_password.value)){ passwOk = true; } //驗證password
if(checkEmail(ele.email.value)){ emailOk = true; } //驗證email
if(nameOk && passwOk && emailOk){
alert("Tip: Register Success .."); //注冊成功
//return true;
}
return false; //有誤,注冊失敗
}
完整代碼:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title>Register</title>
<meta name="description" content="">
<meta name="keywords" content="">
<link href="" rel="stylesheet">
<style type="text/css">
body{margin:0;padding: 0;}
.login{position:relative;margin:100px auto;padding:50px 20px;width: 350px;height: 200px;border:1px solid #333;}
.login legend{font-weight: bold;color: green;text-align: center;}
.login label{display:inline-block;width:130px;text-align: right;}
.btn{height: 30px;width:100px;padding: 5px;border:0;background-color: #00dddd;font-weight: bold;cursor: pointer;float: right;}
input{height: 20px;width: 170px;}
.borderRed{border: 2px solid red;}
img{display: none;}
</style>
</head>
<body>
<div class="login">
<form name="form" method="post" action="register.php" onsubmit="return check()">
<legend>【Register】</legend>
<p><label for="name">UserName: </label>
<input type="text" id="name" >
<img src="./img/gou.png" width="20px" height="20px"></p>
<p><label for="password">Password: </label>
<input type="password" id="password" >
<img src="./img/gantan.png" width="20px" height="20px"></p>
<p><label for="R_password">Password Again: </label>
<input type="password" id="R_password" >
<img src="./img/gou.png" width="20px" height="20px"></p>
<p><label for="email">Email: </label>
<input type="text" id="email" >
<img src="./img/gou.png" width="20px" height="20px"></p>
<p><input type="submit" value="Register" class="btn"></p>
</form>
</div>
<script type="text/javascript">
function hasClass(obj,cls){ // 判斷obj是否有此class
return obj.className.match(new RegExp('(\\s|^)' + cls + '(\\s|$)'));
}
function addClass(obj,cls){ //給 obj添加class
if(!this.hasClass(obj,cls)){
obj.className += " "+cls;
}
}
function removeClass(obj,cls){ //移除obj對應的class
if(hasClass(obj,cls)){
var reg = new RegExp('(\\s|^)' + cls + '(\\s|$)');
obj.className = obj.className.replace(reg," ");
}
}
function checkName(name){ //驗證name
if(name != ""){ //不為空則正確,當然也可以ajax異步獲取服務器判斷用戶名不重復則正確
removeClass(ele.name,"borderRed"); //移除class
document.images[0].setAttribute("src","./img/gou.png"); //對應圖標
document.images[0].style.display = "inline"; //顯示
return true;
}else{ //name不符合
addClass(ele.name,"borderRed"); //添加class
document.images[0].setAttribute("src","./img/gantan.png"); //對應圖標
document.images[0].style.display = "inline"; //顯示
return false;
}
}
function checkPassw(passw1,passw2){ //驗證密碼
if(passw1 == "" || passw2 == "" || passw1 !== passw2){ //兩次密碼輸入不為空且不等 不符合
addClass(ele.password,"borderRed");
addClass(ele.R_password,"borderRed");
document.images[1].setAttribute("src","./img/gantan.png");
document.images[1].style.display = "inline";
document.images[2].setAttribute("src","./img/gantan.png");
document.images[2].style.display = "inline";
return false;
}else{ //密碼輸入正確
removeClass(ele.password,"borderRed");
removeClass(ele.R_password,"borderRed");
document.images[1].setAttribute("src","./img/gou.png");
document.images[1].style.display = "inline";
document.images[2].setAttribute("src","./img/gou.png");
document.images[2].style.display = "inline";
return true;
}
}
function checkEmail(email){ //驗證郵箱
var pattern = /^([\.a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+(\.[a-zA-Z0-9_-])+/;
if(!pattern.test(email)){ //email格式不正確
addClass(ele.email,"borderRed");
document.images[3].setAttribute("src","./img/gantan.png");
document.images[3].style.display = "inline";
ele.email.select();
return false;
}else{ //格式正確
removeClass(ele.email,"borderRed");
document.images[3].setAttribute("src","./img/gou.png");
document.images[3].style.display = "inline";
return true;
}
}
var ele = { //存放各個input字段obj
name: document.getElementById("name"),
password: document.getElementById("password"),
R_password: document.getElementById("R_password"),
email: document.getElementById("email")
};
ele.name.onblur = function(){ //name失去焦點則檢測
checkName(ele.name.value);
}
ele.password.onblur = function(){ //password失去焦點則檢測
checkPassw(ele.password.value,ele.R_password.value);
}
ele.R_password.onblur = function(){ //R_password失去焦點則檢測
checkPassw(ele.password.value,ele.R_password.value);
}
ele.email.onblur = function(){ //email失去焦點則檢測
checkEmail(ele.email.value);
}
function check(){ //表單提交則驗證開始
var ok = false;
var nameOk = false;
var emailOk = false;
var passwOk = false;
if(checkName(ele.name.value)){ nameOk = true; } //驗證name
if(checkPassw(ele.password.value,ele.R_password.value)){ passwOk = true; } //驗證password
if(checkEmail(ele.email.value)){ emailOk = true; } //驗證email
if(nameOk && passwOk && emailOk){
alert("Tip: Register Success .."); //注冊成功
//return true;
}
return false; //有誤,注冊失敗
}
</script>
</body>
</html>
以上所述就是本文的全部內容了,希望能夠對大家學習javascript表單驗證有所幫助。