Vaildate a Zip code against a list

I want to have a form on my开发者_StackOverflow中文版 intranet site... basically we are a home improvement company and have a list of bad area codes that we do not do business in ... IE list of bad zips 19020 19021 etc are bad so if they are I want it to return with a popup which says bad area ... if it is not on the list I want it to say Good Area

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You haven't given too much information, so what follows is a very general solution. One way to approach this is to have two maps called badZips and goodZips:

var badZips = {
  "19020": true,
  "19021": true
  ...
};


var goodZips = {
  "90210": true,
  ...
};

Then in your form-validation function, you can do:

if(badZips[zip]) {
  alert("You entered a bad zip code");
}

else if(goodZips[zip]) {
  alert("You entered a good zip code");
}

else {
  alert("That zip code is not recognized");
}

Actually creating the maps depends on how your webapp is set up. How do you store the zips - is it in the database? Or have you hardcoded it?

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Using apache, install geoIP. Echo their zipcode into a javascript function, which compares to a black-list you created.

http://www.maxmind.com/app/ip-location

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Your functional requirements are pretty simple but you didn't really mention what setup you have. Do you want this functionality to happen on a form? What are you going to code with? Do you have a database? Based on the tags you've used I'll just assume that you don't have a database.

Basically you can have a list of area codes and a flag for each to indicate if it's a bad or a good code. You can keep this list in a multi-dimensional array in PHP as static data (http://www.webcheatsheet.com/PHP/multidimensional_arrays.php).

So it might look something like:

<?php
   $areaCodes = array( array('aCode'='19020','aFlag'=>true),
                       array('aCode'='19021','aFlag'=>true),
                       array('aCode'='19022','aFlag'=>false)
                     );
?>

When you need an area code to be validated, just do a search in the array and check the flag to see if it's a good code or a bad code.

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Store the zip codes in an array, then check if the given zip is in the array.

<?php
 $BadZip = array("19020", "19021");

 if (in_array($Zip, $BadZip))
 {
   echo "Bad Zip code!";
 }
?>

If in_array returns true, then the zip code is in the list of bad zips.

Alternatively you could use the same method with a list of good zips.