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ZIP code number verification codes

Source: Internet
Author: User
Tags zip
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ZipCode

if (Document.regform.u_zipcode.value = = "") {
Alert ("Hint: You must enter a ZIP code!") ");
Document.regform.u_zipcode.focus ();
return false;
}
if (document.regform.u_zipcode.value.length!=6) {
Alert ("Hint: Zip length not correct!") ");
Document.regform.u_zipcode.focus ();
return false;
}
bstring = "0123456789";
for (i = 0; i < document.regform.u_zipcode.value.length i + +)
{
if (Bstring.indexof (document.regform.u_zipcode.value.substring (i,i+1)) ==-1)
{
Alert (' Zip code can only contain numbers and-* ');
Document.regform.u_zipcode.focus ();
return false;
}
}

Example description

<!doctype HTML Public "-//W3C//DTD XHTML 1.0 transitional//en" "http://www.w3.org/tr/xhtml1/dtd/ Xhtml1-transitional.dtd ""
< Meta http-equiv= "Content-type" content= "text/html;" charset=gb2312 "/>

<body>
<form id=" Form1 "Name=" RegForm "method=" POST " Action= ""
  <label>
  Input ZIP code:
  <input type= "text" name= "U_zipcode"/>
& nbsp </label>
  <LABEL>
  <input type= "Submit" name= "Submit" value= "Verify   onclick=" Checkzip (); " />
  </label>
</form>
</body>

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