Form Verification JS

// File: Check. js

// Check whether it is composed of digits
Function isdigit (s)
{
VaR patrn =/^ [0-9] {1, 20} $ /;
If (! Patrn.exe C (s) return false
Return true
}

// Check Logon Name: You can enter only 5-20 strings starting with a letter, which can contain numbers, "_", and ".".
Function isregisterusername (s)
{
VaR patrn =/^ [A-Za-Z] {1} ([a-zA-Z0-9] | [. _]) {} $ /;
If (! Patrn.exe C (s) return false
Return true
}

// Check user name: only 1-30 strings starting with letters can be entered
Function istruename (s)
{
VaR patrn =/^ [A-Za-Z] {1, 30} $ /;
If (! Patrn.exe C (s) return false
Return true
}

// Password verification: only 6-20 letters, numbers, and underscores can be entered
Function ispasswd (s)
{
VaR patrn =/^ (\ W) {6, 20} $ /;
If (! Patrn.exe C (s) return false
Return true
}

// Verify the phone number and fax number. The phone number can start with "+" and contain "-" in addition to numbers.
Function istel (s)
{
// Var patrn =/^ [+] {0, 1} (\ D) {1, 3} []? ([-]? (\ D) {1, 12}) + $ /;
VaR patrn =/^ [+] {0, 1} (\ D) {1, 3} []? ([-]? (\ D) | []) {1, 12}) + $ /;
If (! Patrn.exe C (s) return false
Return true
}

// Verify the mobile phone number. It must start with a number and can contain "-" in addition to a number.
Function ismobil (s)
{
VaR patrn =/^ [+] {0, 1} (\ D) {1, 3} []? ([-]? (\ D) | []) {1, 12}) + $ /;
If (! Patrn.exe C (s) return false
Return true
}

// Verify the zip code
Function ispostalcode (s)
{
// Var patrn =/^ [a-zA-Z0-9] {3, 12} $ /;
VaR patrn =/^ [a-zA-Z0-9] {} $ /;
If (! Patrn.exe C (s) return false
Return true
}

// Email Detection
Function isemail (thestr ){

VaR atindex = thestr. indexof ('@');
VaR dotindex = thestr. indexof ('.', atindex );
VaR flag = true;
Thesub = thestr. substring (0, dotindex + 1)

If (atindex <1) | (atindex! = Thestr. lastindexof ('@') | (dotindex <atindex + 2) | (thestr. Length <= thesub. Length ))
{Return (false );}
Else {return (true );}
}
// Judge whether it is null
Function isempty (STR ){
If (STR = NULL) | (Str. Length = 0) return true;
Else return (false );
}

// Determine the date
Function isdate (thestr ){
VaR the1st = thestr. indexof ('-');
VaR the2nd = thestr. lastindexof ('-');

If (the1st = the2nd ){
Return false;
} Else {
Var y = thestr. substring (0, the1st );
VaR M = thestr. substring (the1st + 1, the2nd );
VaR d = thestr. substring (the2nd + 1, thestr. Length );
VaR maxdays = 31;

If (isint (m) = false | isint (d) = false | isint (y) = false ){
Return false;
} Else if (Y. Length <4 ){
Return false;
} Else if (! Isbetween (M, 1, 12 )){
Return false;
} Else if (M = 4 | M = 6 | M = 9 | M = 11 ){
Maxdays = 30;
} Else if (M = 2 ){
If (Y % 4> 0 ){
Maxdays = 28;
} Else if (Y % 100 = 0 & Y % 400> 0 ){
Maxdays = 28;
} Else {
Maxdays = 29;
}
}
If (isbetween (d, 1, maxdays) = false ){
Return false;
}
Else {return true ;}
}
}

// Judgment range
Function isbetween (Val, lo, hi ){
If (Val <LO) | (Val> Hi) {return (false );}
Else {return (true );}
}

// Judge whether it is int type
Function isint (thestr ){
VaR flag = true;

If (isempty (thestr) {flag = false ;}
Else
{For (VAR I = 0; I <thestr. length; I ++ ){
If (isdigit (thestr. substring (I, I + 1) = false ){
Flag = false; break;
}
}
}
Return (FLAG );
}

// Common Verification Method for form elements
// Whether the Nu detection is null
// Whether the nm detection is Numeric
// Check whether the EM is mail
// Le = 12 detection Length
// YY year
// Mm Month
// Dd Day
Function validateform (ADD ){
VaR alertmessage = "";
VaR elarr = eval (document. Forms [0]. Name). elements;
VaR stryy = "";
VaR strmm = "";
VaR strdd = "";
For (VAR I = 0; I <elarr. length; I ++ ){
If (elarr [I]. ID ){
VaR arylist = (elarr [I]. ID). Split (',');
For (var j = 0; j <arylist. length; j ++ ){
If (arylist [J]. substring (0, 2) = "Nu "){
If (elarr [I]. value = ""){
Alertmessage = alertmessage + elarr [I]. Title + "cannot be blank! \ N ";
Break;
}
}
If (arylist [J]. substring (0, 2) = "Nm "){
If (elarr [I]. value! = ""){
If (isdigit (elarr [I]. Value) = false ){
Alertmessage = alertmessage + elarr [I]. Title + "not a number! \ N ";
Break;
}
}
}
If (arylist [J]. substring (0, 2) = "em "){
If (elarr [I]. value! = ""){
If (isemail (elarr [I]. Value) = false ){

Alertmessage = alertmessage + elarr [I]. Title + "Incorrect format! \ N ";
Break;
}
}
}
If (arylist [J]. substring (0, 2) = "Le "){
If (elarr [I]. value! = ""){
VaR elelength = elarr [I]. value. length;
VaR ordlength = arylist [J]. substring (3,100 );
If (elelength> ordlength ){
Alertmessage = alertmessage + elarr [I]. Title + "length requirement:" + ordlength + "bit! \ N ";
Break;
}
}
}
If (arylist [J]. substring (0, 2) = "YY "){
Stryy = elarr [I]. value;
}
If (arylist [J]. substring (0, 2) = "mm "){
Strmm = elarr [I]. value;
}
If (arylist [J]. substring (0, 2) = "DD "){
Strdd = elarr [I]. value;
}
If (stryy! = "" & Strmm! = "" & Strdd! = ""){
If (stryy! = "" & Strmm! = "" & Strdd! = ""){
VaR strdate = stryy + "-" + strmm + "-" + strdd;
If (isdate (strdate) = false ){
Alertmessage = alertmessage + "incorrect date format \ n ";
Stryy = "";
Strmm = "";
Strdd = "";
}
}
}

}
}
}

If (add = "true "){
Alertmessage = addmessage (alertmessage );
}

If (alertmessage! = ""){
Alert (alertmessage );
Return false;
} Else {
Return true;
}
}

Function checkboxchecked (checkboxname)
{
VaR COUNT = 0;
VaR formname = Document. Forms [0]. Name;
If (eval ("document." + formname + "." + checkboxname). length! = NULL)
{

For (VAR I = 0; I <eval ("document." + formname + "." + checkboxname). length; I ++)
{
If (eval ("document." + formname + "." + checkboxname) [I]. Checked = true)
{

Count = count + 1;
}
}
}
Else
{
If (eval ("document." + formname + "." + checkboxname). Checked = true)
{
Count = count + 1;
}
}
Return count;
}

// File: index.html

<HTML>
<Script language = "JavaScript" src = "check. js"> </SCRIPT>
<SCRIPT>
Function addmessage (Message ){
Message = message + "added error message \ n"
Return message;
}
</SCRIPT>
<Body>
<Form name = "ordform" id = "ordform" method = "Post">
<Input type = "test" name = "name" id = "Nu, Nm" Title = "name">
<Input type = "test" name = "password" id = "Nu, Le = 12" Title = "password">
<Input type = "test" name = "mail" id = "Nu, em" Title = "email">
<Input type = "test" name = "yybirthday" id = "YY" Title = "name">
<Input type = "test" name = "mmbirthday" id = "mm" Title = "password">
<Input type = "test" name = "ddbirthday" id = "DD" Title = "email">
<Input type = "button" value = "Submit" onclick = "validateform (ordform)">
</Form>
</Body>
</Html>

// common Verification Method for form elements
// nu detection
// nm detection: Numeric
// em Detection: Mail
// Le = 12 detection length
// YY year
// mm Month
/dd Day