Confirmation of radio buttons - javascript

I have all ready inserted the validation for the radio button and now all i need is to have a alert box to come up before the code proceeds asking "Are you sure you want to pick 'x'" when x would be the level selected. And if cancel is pressed it returns to the webpage.
Thank you are here is my code below.
<html>
<head>
<title>Exam entry</title>
<script language="javascript" type="text/javascript">
function validateForm() {
var result = true;
var msg = "";
if (document.ExamEntry.name.value == "") {
msg += "You must enter your name \n";
document.ExamEntry.name.focus();
document.getElementById('name').style.color = "red";
result = false;
}
if (document.ExamEntry.number.value == "") {
msg += "You must enter a exam number \n";
document.ExamEntry.number.focus();
document.getElementById('number').style.color = "red";
result = false;
}
if (document.ExamEntry.subject.value == "") {
msg += "You must enter the subject \n";
document.ExamEntry.subject.focus();
document.getElementById('subject').style.color = "red";
result = false;
}
if ((document.ExamEntry.level[0].checked == false) && (document.ExamEntry.level[1].checked == false) && (document.ExamEntry.level[2].checked == false)) {
msg += "You mus select the level entered \n";
result = false;
}
}
function CheckField(obj) {
if (obj.value.length < '4') {
alert('Name field must 4 character long');
obj.focus();
}
}
</script>
</head>
<body>
<h1>Exam Entry Form</h1>
<form name="ExamEntry" method="post" action="success.html">
<table width="50%" border="0">
<tr>
<td id="name">Name</td>
<td><input type="text" name="name" /></td>
</tr>
<tr>
<td id="number">Examination Number</td>
<td><input type="text" name="number" maxlength="4" onblur="CheckField(this)"/></td>
</tr>
<tr>
<td id="subject">Subject</td>
<td><input type="text" name="subject" /></td>
</tr>
<tr>
<input type="radio" name="level">GCSE
<input type="radio" name="level">AS
<input type="radio" name="level">A2
<tr>
<td><input type="submit" name="Submit" value="Submit" onclick="return validateForm();" /> </td>
<td><input type="reset" name="Reset" value="Reset" /></td>
</tr>
</table>
</form>
</body>
</html>

Hope this helps to get along.
<!DOCTYPE html>
<html>
<head>
<title>Exam entry</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<script type="text/javascript">
function validateForm() {
var result = true;
var msg = "";
var objx;
// test for empty inputs
objx = document.getElementById("subjectInput");
if (objx.value.length == 0) {
msg += "You must enter the subject \n";
objx.focus();
document.getElementById('subject').style.color = "red";
result = false;
}
objx = document.getElementById("numberInput");
if (objx.value.length == 0) {
msg += "You must enter a exam number \n";
objx.focus();
document.getElementById('number').style.color = "red";
result = false;
}
objx = document.getElementById("nameInput");
if (objx.value.length == 0) {
msg += "You must enter your name \n";
objx.focus();
document.getElementById('name').style.color = "red";
result = false;
}
// checked level is needed below for confirmation
var objx = document.ExamEntry;
var checkedLevel = "";
if (objx.level[0].checked) {
checkedLevel = objx.level[0].value;
}
else
if (objx.level[1].checked) {
checkedLevel = objx.level[1].value;
}
else
if (objx.level[2].checked) {
checkedLevel = objx.level[2].value;
}
if (checkedLevel.length == 0) {
msg += "You must select the level entered \n";
result = false;
}
if (result) {
// test for minimum length of name
objx = document.getElementById("nameInput");
if (objx.value.length < 4)
{
objx.focus();
document.getElementById('name').style.color = "red";
//alert('Name field must 4 character long');
msg += 'Name field must be 4 characters long'
result = false;
}
}
// confirm checked level
if (result) {
result = confirm("Are you sure you want to pick '" + checkedLevel + "' ?");
}
else {
alert(msg);
}
return result;
}
</script>
</head>
<body>
<h1>Exam Entry Form</h1>
<form name="ExamEntry" method="post" onsubmit="return validateForm();" action="success.html">
<table width="50%" border="0">
<tr>
<td id="name">Name</td>
<td><input type="text" name="name" id="nameInput" /></td>
</tr>
<tr>
<td id="number">Examination Number</td>
<td><input type="text" name="number" id="numberInput" maxlength="4" /></td>
</tr>
<tr>
<td id="subject">Subject</td>
<td><input type="text" name="subject" id="subjectInput" /></td>
</tr>
<tr>
<input type="radio" name="level" value="GCSE">GCSE
<input type="radio" name="level" value="AS">AS
<input type="radio" name="level" value="A2">A2
<tr>
<td><input type="submit" name="Submit" value="Submit" /> </td>
<td><input type="reset" name="Reset" value="Reset" /></td>
</tr>
</table>
</form>
</body>
</html>

Related

Javascript function change text colour

So I am creating an exam entry form for school and when a user enters anything wrong, the name of the field will turn red (what the user has input will remain the same) I need to be able to do this with an onclick event activated by my reset button however the function I have right now does not do this. Here is my code:
<!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 http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Exam Entry</title>
<script language="javascript" type="text/javascript">
function validateForm() {
var result = true;
var msg="";
if (document.ExamEntry.name.value=="") {
msg+="You must enter your name \n";
if(result) document.ExamEntry.name.focus();
document.getElementById('name').style.color="red";
result = false;
}
if (document.ExamEntry.subject.value=="") {
msg+="You must enter the subject \n";
if(result) document.ExamEntry.subject.focus();
document.getElementById('subject').style.color="red";
result = false;
}
if (document.ExamEntry.examnumber.value=="") {
msg+="You must enter the exam number \n";
if(result) document.ExamEntry.examnumber.focus();
document.getElementById('examnumber').style.color="red";
result = false;
}
if (document.ExamEntry.examnumber.value.length!=4) {
msg+="Your exam number must be exactly 4 digits \n";
if(result) document.ExamEntry.examnumber.focus();
document.getElementById('examnumber').style.color="red";
result = false;
}
if(msg != ""){
alert(msg);
return result;
}
var checked = null;
var inputs = document.getElementsByName('examtype');
for (var i = 0; i < inputs.length; i++) {
if (inputs[i].checked) {
checked = inputs[i];
break;
}
}
if(checked==null) {
alert('Please choose an option');
return false;
}
else {
return confirm('You have chosen '+checked.value+' is this correct?');
}
function resetNames() {
document.getElementById('name').removeAttribute('style')
document.getElementById('subject').removeAttribute('style')
document.getElementById('examnumber').removeAttribute('style')
}
}
</script>
</head>
<body>
<h1>Exam Entry Form</h1>
<form name="ExamEntry" method="post" action="success.html">
<table width="50%" border="0">
<tr>
<td id="name">Name</td>
<td><input type="text" name="name" placeholder='Name' /></td>
</tr>
<tr>
<td id="subject">Subject</td>
<td><input type="text" name="subject" placeholder='Subject' /></td>
</tr>
<tr>
<td id="examnumber">Exam Number</td>
<td><input type="text" name="examnumber" size="4" maxlength="4" placeholder='No.'/></td>
</tr>
<tr>
<td><input type="radio" id="examtypeGCSE" name="examtype" value="GCSE" /> : GCSE<br/>
<input type="radio" id="examtypeA2" name="examtype" value="A2" /> : A2<br/>
<input type="radio" id="examtypeAS" name="examtype" value="AS"/> : AS<br/>
</tr>
<tr>
<td><input type="submit" name="Submit" value="Submit" onclick="return validateForm();" /></td>
<td><input type="reset" name="Reset" value="Reset" onclick="return resetNames();" /></td>
</tr>
</table>
</form>
</body>
</html>
I think your closing braces may be in the wrong place... move one of the two closing braces at the end of your JavaScript to the end of the validateForm() function.
try something like this
YOUR CODE
function validateForm() {
....
function resetNames() {
document.getElementById('name').removeAttribute('style')
document.getElementById('subject').removeAttribute('style')
document.getElementById('examnumber').removeAttribute('style')
}
}
CHANGE TO
function validateForm() {
......
}
function resetNames() {
document.getElementById('name').removeAttribute('style')
document.getElementById('subject').removeAttribute('style')
document.getElementById('examnumber').removeAttribute('style')
}
Reason you have nested your function one inside another.

Radio button validation (alert box) confirmation and rejection

I'm working on a HTML document which is an exam submission form. I've completed almost all of the set tasks however, I'm having trouble validating radio buttons. I've searched on stackoverflow however, the answers do not meet the criteria of the question. My completed code is shown below.
I'm having trouble with the bold part of this task:
Add a set of radio buttons to the form to accept a level of entry such as GCSE, AS or A2. Write a function that displays the level of entry to the user in an alert box so that the level can be confirmed or rejected.
Below is the code working, excluding the validation of the radio buttons. Seperatley, I have the code which doesn't work when implemented into the function validateForm().
<html>
<head>
<title>Exam entry</title>
<script language="javascript" type="text/javascript">
function validateForm() {
var result = true;
var msg = "";
if (document.ExamEntry.name.value == "") {
msg += "You must enter your name \n";
document.ExamEntry.name.focus();
document.getElementById('name').style.color = "red";
result = false;
}
if (document.ExamEntry.subject.value == "") {
msg += "You must enter the subject \n";
document.ExamEntry.subject.focus();
document.getElementById('subject').style.color = "red";
result = false;
}
if (document.ExamEntry.examno.value == "") {
msg += "You must enter your Examination Number \n";
document.ExamEntry.examno.focus();
document.getElementById('examinationno').style.color = "red";
result = false;
}
if (document.ExamEntry.examno.value.length!== 4) {
msg+="Your Examination Number should be 4 digits.\n";
document.ExamEntry.examno.focus();
document.getElementById('examinationno').style.color="red";
result = false;
}
if(msg==""){
return result;
}
{
alert(msg)
return result;
}
}
</script>
</head>
<body>
<h1>Exam Entry Form</h1>
<form name="ExamEntry" method="post" action="success.html">
<table width="50%" border="0">
<tr></tr>
<tr>
<td id="name">Name</td>
<td>
<input type="text" name="name" />
</td>
</tr>
<tr>
<td id="subject">Subject</td>
<td>
<input type="text" name="subject" />
</td>
</tr>
<tr>
<td id="examinationno">Examination Number</td>
<td>
<input type="text" name="examno" />
</td>
</tr>
<tr>
<td>
<input type="radio" name="examtype" value="GCSE" />GCSE</td>
</tr>
<tr>
<td>
<input type="radio" name="examtype" value="AS" />AS</td>
</tr>
<tr>
<td>
<input type="radio" name="examtype" value="A2" />A2</td>
</tr>
<tr>
<td>
<input type="submit" name="Submit" value="Submit" onClick="return validateForm();" />
</td>
<td>
<input type="reset" name="Reset" value="Reset" />
</td>
</tr>
</table>
</form>
Based on the current code, why won't the following validate when added into the function?:
if(document.getElementById('GCSE').checked)
{examtype = "GCSE";
}
if(document.getElementById('AS').checked)
{examtype = "AS";
}
if(document.getElementById('A2').checked)
{examtype = "A2";
}
if(confirm("You have selected"+examtype+.Continue?")){
if(msg==""){
return result;
}
{
alert(msg)
return result;
}
}
else{
alert("Action cancelled");
return false;
}
// Retrieving the checked radio button value
function getRadioValue (frmName, rbGroupName)
{
var radios = document[frmName].elements[rbGroupName];
for (var i=0; i <radios.length; i++)
{
if (radios[i].checked)
{
return radios[i].value;
}
}
return false;
}
Call the getRadioValue() inside validateForm()
// examtype gets false or GCSE or AS or A2
var examtype = getRadioValue ("ExamEntry", "examtype");
"Continue" is a keyword. So you have to wrap it in apostrophes("). I could not get the structure of if-statements, I made some changes. I hope this is what you are looking for..
if(confirm("You have selected"+examtype+". Continue?")){
if(msg==""){
alert(msg);
return result;
}
else{
alert("Action cancelled");
return false;
}
}

Resetting Radio Buttons

Here is a fiddle containing my code - http://jsfiddle.net/jamiepollard28/sDLV4/8/
I am trying to make my code reset the radio buttons only when the user clicks cancel on the alert box of validation for the radio buttons.
When you click submt containing the required data with a radio button selected a alert box will come up confirming or rejecting the choice, when i click cancel on that alert box i want the radio button selection to reset.
Below is my code.
<html>
<head>
<title>Exam entry</title>
<script language="javascript" type="text/javascript">
window.onload=function(){
window.validateForm=function() {
var result = true;
var msg = "";
var focusname="";
if (document.ExamEntry.name.value == "") {
msg += "You must enter your name \n";
focusname="name";
//document.ExamEntry.name.focus();
document.getElementById('name1').style.color = "red";
//result = false;
}
if (document.ExamEntry.subject.value == "") {
msg += "You must enter the subject \n";
// document.ExamEntry.subject.focus();
if (focusname=="")
{
focusname="subject";
}
document.getElementById('subject1').style.color = "red";
//result = false;
}
var Number = document.ExamEntry.Exam_Number.value
if (Number == "") {
msg += "You must enter the exam Number \n";
//document.ExamEntry.Exam_Number.focus();
if (focusname=="")
{
focusname="Exam_Number";
}
document.getElementById('Exam_Number1').style.color = "red";
//result = false;
}else if (Number.length != 4) {
msg += "You must enter at least Four Numbers in the Exam Number \n";
if (focusname=="")
{
focusname="Exam_Number";
}
//document.ExamEntry.Exam_Number.focus();
document.getElementById('Exam_Number1').style.color = "red";
//result = false;
}
else if (isNaN(Number)) {
msg += "You must enter at least four numeric characters in the Exam Number feild \n";
if (focusname=="")
{
focusname="Exam_Number";
}
// document.ExamEntry.Exam_Number.focus();
document.getElementById('Exam_Number1').style.color = "red";
//result = false;
}
var valchecked = '';
var len = document.getElementsByName('examtype').length;
for (i = 0; i < len; i++) {
if ( document.ExamEntry.examtype[i].checked ) {
valchecked = document.ExamEntry.examtype[i].value;
break;
}
}
if (valchecked == '') {
msg += "Select Exam Type";
document.getElementById('Exam_Type').style.color = "red";
if (focusname=="")
{
focusname="examtype_GCSE";
}
}
if (msg != ""){
alert(msg)
document.getElementById(focusname).focus();
return false;
}else{
return confirm('You have chosen ' + valchecked + ' is this correct?');
}
}
}//]]>
</script>
</head>
<body>
<h1>Exam Entry Form</h1>
<form name="ExamEntry" method="post" action="success.html">
<table width="50%" border="0">
<tr>
<td id="name1">Name</td>
<td><input type="text" name="name" id="name" /></td>
</tr>
<tr>
<td id="subject1">Subject</td>
<td><input type="text" name="subject" id="subject"/></td>
</tr>
<tr>
<td id="Exam_Number1">Exam Number</td>
<td><input type="text" name="Exam_Number" id="Exam_Number" ><font size="3">(Maximum characters: 4)</font> </td>
</tr>
<tr>
<table><form action="">
<td id="Exam_Type">Exam Type</td>
<tr><td><input type="radio" id="examtype_GCSE" name="examtype" value="GCSE" /> : GCSE<br /></tr>
<tr><td><input type="radio" id="examtype_AS" name="examtype" value="AS"/> : AS<br /></tr>
<tr><td><input type="radio" id="examtype_A2" name="examtype" value="A2" /> : A2<br /></tr>
<tr><td><input type="submit" name="Submit" value="Submit" onclick="return validateForm();" /></td>
<td><input type="reset" name="Reset" value="Reset" /></td>
</tr>
</table>
</form>
</body>
</html>
You are simply returning the users choice, you need to first check it, if it is true return true for form submission else reset radio and return false, as follows: FIDDLE
var ch= confirm('You have chosen ' + valchecked + ' is this correct?');
if(!ch){
document.getElementById('examtype_'+valchecked).checked= false;
return false; }
else
return true;
}
With an if loop you can solve the issue
try following code
if(confirm('You have chosen ' + valchecked + ' is this correct?')){
return true;
}
else{
document.getElementById('examtype_'+valchecked).checked= false;
return false;
}

Javascript button click on event to run a function [closed]

Closed. This question is not reproducible or was caused by typos. It is not currently accepting answers.
This question was caused by a typo or a problem that can no longer be reproduced. While similar questions may be on-topic here, this one was resolved in a way less likely to help future readers.
Closed 8 years ago.
Improve this question
Ok, I have GCSE coursework to do based on this piece of code, although the code given to us to begin with(shown below) isn't correctly working, I believe it to be because the click on event isn't running the function that validates the information entered.
<head>
<title>Exam entry</title>
<script language=”javascript” type=”text/javascript”>
function validateForm() {
var result = true;
var msg = ””;
if (document.ExamEntry.name.value == ””) {
msg += ”You must enter your name\n”;
document.ExamEntry.name.focus();
document.getElementById(‘name’).style.color = ”red”;
result = false;
}
if (document.ExamEntry.subject.value == ””) {
msg += ”You must enter the subject\n”;
document.ExamEntry.subject.focus();
document.getElementById(‘subject’).style.color = ”red”;
result = false;
}
if (msg == ””) {
return result;
} {
alert(msg)
return result;
}
}
</script>
</head>
<body>
<h1>Exam Entry Form</h1>
<form name=”ExamEntry” method=”post” action=”success.html”>
<table width=”50%” border=”0”>
<tr>
<td id=”name”>Name</td>
<td><input type=”text” name=”name” /></td>
</tr>
<tr>
<td id=”subject”>Subject</td>
<td><input type=”text” name=”subject” /></td>
</tr>
<tr>
<td> <button type=”button” name=”Submit” value=”Submit” onclick=”return validateForm();” />"Submit"</button></td>
<td> <button type=”button” name=”Reset” value=”Reset” />Reset</td>
</tr>
</table>
</form>
</body>
This is the code now with all the updates, but it still fails to run the function :
<head>
<title>Exam entry</title>
<h1>Exam Entry Form</h1>
<script language=”javascript” type=”text/javascript”>
function validateForm() {
var result = true;
var msg = '';
if (document.ExamEntry.name.value == '') {
msg += 'You must enter your name\n';
document.ExamEntry.name.focus();
document.getElementById('name').style.color = 'red';
result = false;
}
if (document.ExamEntry.subject.value == '') {
msg += 'You must enter the subject\n';
document.ExamEntry.subject.focus();
document.getElementById('subject').style.color = 'red';
result = false;
}
if (msg == '') {
return result;
}
alert(msg);
return result;
}
</script>
<form name="ExamEntry" method="post" action="success.html">
<table width="50%" border="0">
<tr>
<td id="name">Name</td>
<td>
<input type="text" name="name" />
</td>
</tr>
<tr>
<td id="subject">Subject</td>
<td>
<input type="text" name="subject" />
</td>
</tr>
<tr>
<td>
<button type="button" name="Submit" value="Submit" onclick="return validateForm();" />
Submit
</td>
<td>
<button type="button" name="Reset" value="Reset" />Reset</td>
</tr>
</table>
</form>
jsFiddle
HTML
<h1>Exam Entry Form</h1>
<form name="ExamEntry" method="post" action="success.html">
<table width="50%" border="0">
<tr>
<td id="name">Name</td>
<td>
<input type="text" name="name" />
</td>
</tr>
<tr>
<td id="subject">Subject</td>
<td>
<input type="text" name="subject" />
</td>
</tr>
<tr>
<td>
<button type="button" name="Submit" value="Submit" onclick="return validateForm();" />
Submit
</td>
<td>
<button type="button" name="Reset" value="Reset" />Reset</td>
</tr>
</table>
</form>
JS
function validateForm() {
var result = true;
var msg = '';
if (document.ExamEntry.name.value == '') {
msg += 'You must enter your name\n';
document.ExamEntry.name.focus();
document.getElementById('name').style.color = 'red';
result = false;
}
if (document.ExamEntry.subject.value == '') {
msg += 'You must enter the subject\n';
document.ExamEntry.subject.focus();
document.getElementById('subject').style.color = 'red';
result = false;
}
if (msg == '') {
return result;
}
alert(msg);
return result;
}
Fixing your quotes, and other errors, your code works below.
<!DOCTYPE html>
<html>
<head>
<title>Validator</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width">
</head>
<body>
<h1>Exam Entry Form</h1>
<form name="ExamEntry" id="ExamEntry" method="POST" action="#" onsubmit="return validateForm();">
<table width="50%" border="0">
<tr>
<td id="name">Name</td>
<td>
<input id="nameField" type="text" name="name" >
</td>
</tr>
<tr>
<td id="subject">Subject</td>
<td>
<input type="text" name="subject" id="subjectField">
</td>
</tr>
<tr>
<td>
<button type="submit" name="Submit" value="Submit">"Submit"</button>
</td>
<td>
<button type="reset" name="Reset" value="Reset">Reset</button>
</td>
</tr>
</table>
</form>
<script>
function validateForm() {
var result = true;
var msg = "";
if (document.getElementById("nameField").value === "") {
msg += "You must enter your name\n";
document.ExamEntry.name.focus();
document.getElementById("name").style.color = "red";
result = false;
}
if (document.ExamEntry.subject.value === "") {
msg += "You must enter the subject \n";
document.ExamEntry.subject.focus();
document.getElementById("subject").style.color = "red";
result = false;
}
if (msg === "") {
return result;
}
else {
alert(msg);
return result;
}
}
</script>
</body>
</html>
We're doing the same thing. Make sure you are using Notepad and that you are saving it as a HTML file when you open it.
Hope this helped!
Also, could someone please explain what "action=success.html" does?

I wish to make my code validate a field to make sure it is a number of four digits. How can I do this?

I am currently doing a GCSE course which allows me to ask for assistance from IT sources as long as I reference them in my investigation. I wish to make the following code validate that there is a number of four digits in the Examination Number entry field. I'm okay with simple validation but this is another step for me.
<head>
<title>Exam entry</title>
<script language="javascript" type="text/javascript">
function validateForm() {
var result = true;
var msg="";
if (document.ExamEntry.name.value=="") {
msg+="You must enter your name \n";
document.ExamEntry.name.focus();
document.getElementById('name').style.color="red";
result = false;
}
if (document.ExamEntry.subject.value=="") {
msg+="You must enter the subject \n";
document.ExamEntry.subject.focus();
document.getElementById('subject').style.color="red";
result = false;
}
if (document.ExamEntry.examnumber.value=="") {
msg+="You must enter your Examination Number \n";
document.ExamEntry.examnumber.focus();
document.getElementById('examnumber').style.color="red";
result = false;
}
var checked = null;
var inputs = document.getElementsByName('examtype');
for (var i = 0; i < inputs.length; i++) {
if (inputs[i].checked) {
checked = inputs[i];
document.getElementById('examtype').style.color="red";
}
}
if(checked==null)
{
msg+="Please choose an option";
result = false;
}
else{
confirm("You have chosen "+checked.value+" is this the correct course?");
}
if(msg==""){
return result;
}
{
alert(msg)
return result;
}
}
</script>
</head>
<body>
<h1>Exam Entry Form</h1>
<form name="ExamEntry" method="post" action="success.html">
<table width="50%" border="0">
<tr>
<td id="name">Name</td>
<td><input type="text" name="name" /></td>
<tr>
<td id="subject">Subject</td>
<td><input type="text" name="subject" /></td>
</tr>
<tr>
<td id="examnumber">Examination Number</td>
<td><input type="text" name="examnumber" /></td>
</tr>
<tr>
<td><input type="radio" id="examtype" name="examtype" value="GCSE" /> : GCSE<br />
<td><input type="radio" id="examtype" name="examtype" value="A2" /> : A2<br />
<td><input type="radio" id="examtype" name="examtype" value="AS"/> : AS<br />
</tr>
<tr>
<td><input type="submit" name="Submit" value="Submit" onClick="return validateForm();" /> </td>
<td><input type="reset" name="Reset" value="Reset" /></td>
</tr>
</table>
</form>
</body>
Regarding checking if it is number, you can use some regex:
e.g.
var reg = /^\d{4}$/ig;
var regExRes = reg.exec(document.ExamEntry.examnumber.value);
if (document.ExamEntry.examnumber.value == "" || (regExRes == null || regExRes.length == 0)) {
msg += "You must enter your Examination Number \n";
document.ExamEntry.examnumber.focus();
document.getElementById('examnumber').style.color = "red";
result = false;
}
To avoid entering anything beside number, I would suggest you to use something like jquery pluging called masked input
EDIT:
line changed from var reg = /\d{4}/ig; to var reg = /^\d{4}$/ig;

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