JSP 验证输入信息是否正确

function changeFocus(){

if(event.keyCode==13&&event.srcElement.type!='button'&&event.srcElement.type!='submit')

{

event.keyCode=9

}

}document.onkeyCode=changeFocus;

function checkUserName(){

var fname=document.myform.txtUserName.value;

if(fname.length!=0){

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

var ftext=fname.substring(i,i+1);

if(ftext<9||ftext>0){

alert("名字中包含数字/n请重新输入！");

document.myform.txtUserName.focus();

return false;}

}

}

else{

alert("请输入用户名：");

document.myform.txtUserName.focus();

return false;}

return true;

}

function ShowUserModel()

{

window.showModalDialog("checkUser.html","","dialogWidth=200px;dialogHeight=70px");

}

function checkEmailShow(){

if(checkUserName()&&ShowUserModel()){

return true;}

else{

return false;}

}

function checkPassword(){

var userPass=document.myform.txtPwd.value;

if(userPass.length==0)

{

alert("请输入密码：");

document.myform.txtPwd.focus();

return false;

}

if(userPass.length<6){

alert("密码长度小于6，请重新输入：");

document.myform.txtPassword.focus();

return false;

}

return true;

}

function checkEmail(){

var strEmail=document.myform.txtEmail.value;

if(strEmail.length==0)

{

alert("请输入邮箱名：");

document.myform.txtEmail.focus();

document.myform.txtEmail.select();

return false;

}

if(strEmail.indexOf("@",0)==-1)

{

alert("电子邮箱格式不正确/n必须包含@符号！");

document.myform.txtEmail.focus();

document.myform.txtEmail.select();

return false;

}

if(strEmail.indexOf(".",0)==-1)

{

alert("电子邮箱格式不正确/n必须包含.符号！");

document.myform.txtEmail.focus();

document.myform.txtEmail.select();

return false;

}

return true;

}

function ShowEmailModel()

{

window.showModalDialog("checkEmail.html","","dialogWidth=200px;dialogHeight=70px");

}

function checkEmailShow(){

if(checkEmail()&&ShowEmailModel()){

return true;}

else{

return false;}

}

function validataform(){

if(checkUserName() && checkPassword()&&checkEmail()){

return true;

}

else{

return false;}

}

function register(){

alert("信息已提交！！！");

}