JQuery Postcode Validation Problem

millsy007 · 10-15-2012, 11:52 PM

I have some code that should check for a correctly formatted UK postcode, however I can't get it to carry out the check, I click submit and nothing happens. I was thinking I have a syntax error but I have tried everything I can with no success?

Code:

<html>

<head>
<script src="/jquery/jquery.js"></script>
<script src="/jquery/jquery.validate.js"></script>
<script>
$(document).ready(function(){

                                $.validator.addMethod(
                                        "validpostcode",
                                        function(value, element, regexp) {
                                                var check = false;
                                                var re = new RegExp(regexp);
                                                return this.optional(element) || re.test(value);
                                        },
                                        "Please enter a valid postcode."
                                );
   
    $("#commentForm").validate({
   
    rules: {
        postcode: {
                required: true,
                minlength: 3,
                validpostcode: "^([a-zA-Z]){1}([0-9][0-9]|[0-9]|[a-zA-Z][0-9][a-zA-Z]|[a-zA-Z][0-9][0-9]|[a-zA-Z][0-9]){1}([        ])([0-9][a-zA-z][a-zA-z]){1}$"
        },


    messages: {
        postcode: {
                required: "Please Enter Postcode",
                minlength: jQuery.format("You need to use at least {0} characters for your postcode.")
                }
    }
   
    });
});

</script>
</head>

<body>

<form id="commentForm" method="get" action="">
 <fieldset>
   <p>
     <label for="cpostcode">Postcode</label>
     <em>*</em><input id="cpostcode" name="postcode" size="25" />
   </p>
   <p>
     <input class="submit" type="submit" value="Submit"/>
   </p>
 </fieldset>
 </form>


</body>
</html>

Philip M · 10-16-2012, 08:31 AM

I don't use unwieldy jQuery, but a simple regex to validate a UK postcode is:-

Code:

if (/^[A-Z]{1,2}\d{1,2}[A-Z]?\s\d[A-Z]{2}$/.test(postcode.value)) {    // UK postcode including SW1A 1AA (space required) - must be in caps

However, a more sophisticated regex which disallows postcodes which do not exist such as AC or DF is

Code:

if(/((^(A[BL]|B[ABDHLNRST]|C[ABFHMORTVW]|D[ADEGHLNTY]|E[HNX]|F[KY]|G[LUY]|H[ADGPRSUX]|I[GMPV]|JE|K[ATWY]|L[ADELNSU]|M[EKL]|N[EGNPRW]|O[LX]|P[AEHLOR]|R[GHM]|S[AEGKL-PRSTWY]|T[ADFNQRSW]|UB|W[ADFNRSV]|YO|ZE)\d\d?)|(^W1[A-HJKSTUW0-9])|(^WC[1-2])|(^EC[1-4])|(^SW1[ABEHMNPRVWXY])|(^GIR\s?0AA))(\s\d[ABDEFGHJLNPQRSTUWXYZ]{2})$/.test(postcode.value)) { //  UK POSTCODES  Letters C, I, K, M, O and V are never used in the incode.  Must be in caps.

If you have a syntax error try using your error console.

“The old believe everything; the middle aged suspect everything; the young know everything.” - Oscar Wilde (Irish Poet, Novelist, Dramatist and Critic, 1854-1900)