js several verification function codes_form effects-JS Tutorial-php.cn

Copy code The code is as follows:

 
//Check if it is not empty
function notEmpty(obj, msg ) 
{ 
str = obj.value; 
str1 = ""; 
for (i = 0; i < str.length; i ) 
{ 
if (str .charAt(i) != " ") 
{ 
str1 = str.substr(i, str.length); 
break; 
} 
} 
if (str1 = = "") 
{ 
alert(msg); 
obj.value = ""; 
obj.focus(); 
return false; 
} 
else 
{ 
return true; 
} 
} 
//Check if it is a number
function isNumber(obj, msg) 
{ 
if(isNaN(obj.value )) 
{ 
if (undefined == msg) 
{ 
msg = "Please enter a number!"; 
} 
alert(msg); 
obj.select (); 
return false; 
} 
else 
{ 
return true; 
} 
} 
//Check whether the passwords are the same
function isSamePwd( objPwd1, objPwd2, msg) 
{ 
pwd1 = objPwd1.value; 
pwd2 = objPwd2.value; 
if (pwd1 != pwd2) 
{ 
if (null == msg) 
{ 
alert("Passwords are different!"); 
} 
else 
{ 
alert(msg); 
} 
objPwd2.value = ""; 
objPwd2.focus(); 
return false; 
} 
else 
{ 
return true; 
} 
} 
//check Email address
function isEmail(obj, msg) 
{ 
ch = obj.value; 
if((ch.indexOf("@") < 1) || (ch.indexOf( ".") < 1) || (ch.indexOf(".") == ch.length - 1)) 
{ 
if (null == msg) 
{ 
alert ("Email is incorrect! "); 
} 
else 
{ 
alert(msg); 
} 
obj.select(); 
return false; 
} 
else 
{ 
return true; 
} 
} 