Javascript Form Validation

I used to do a script for every input to check their validity even to just check if it is blank.

The following is an easier and more streamline way of doing the same thing.

function isEmpty(query,query2){

if (query.value=="")

return query2+" must not be empty\n"

else

return ""

}

function isEmail(query,query2){

var emailRegEx = /^([a-z0-9][a-z0-9_.-]*[a-z0-9])+@+([a-z0-9][a-z0-9-]*[.])+[a-z0-9]{2,4}$/i;

if (emailRegEx.test(query.value)== false)

return query2+ " is not valid Email\n"

else

return ""

}

function isNumber(query,query2){

var numRegEx = /(^[+-]?[0-9]+\.[0-9]{1,}$)|(^[+-]?[0-9]+$)/;

if (numRegEx.test(query.value)== false )

return query2+ " is not valid Number\n"

else

return ""

}

function isInteger(query,query2){

var numRegEx = /^[+-]?[0-9]+$/;

if (numRegEx.test(query.value)== false)

return query2+ " is not valid Integer\n"

else

return ""

}

function isPlusNumber(query,query2){

var numRegEx = /(^[+]?[0-9]+\.[0-9]+$)|(^[+]?[0-9]+$)/;

if (numRegEx.test(query.value)== false)

return query2+ " is not Positive Number\n"

else

return ""

}

function isRadio(query,query2){

var testrad=false

for (radb=0;radb<query.length;radb++){

if (query[radb].checked == true)

testrad=true

}

if (testrad)

return ""

else

return query2 +" no selection\n"

}

function isSelect(query,query2){

// provided selected item 0 =not valid selection.

if (query.selectedIndex == 0)

return query2 +" no selection\n"

else

return ""

}

function isCheckBox(query,query2){

if (query.checked==true)

return ""

else

return query2+" must be checked\n"

}

function isPhone(query,query2){

// for Singapore only

var numRegEx = /(^[689]{1}[0-9]{7}$)|(^\+65[689]{1}[0-9]{7}$)/;

if (numRegEx.test(query.value)== false )

return query2+ " is not valid Phone Number\n"

else

return ""

}

function chksmt(){

obj=document.noname

ecode=""

ecode +=isEmpty(obj.Adr,"Address")

ecode +=isPlusNumber(obj.Pcode,"Postal Code")

ecode +=isInteger(obj.Cno,"Contact No")

ecode +=isEmail(obj.Email,"Email")

if (ecode !=""){

alert(ecode)

return 0

}

obj.submit()

}