[SOLVED] Need help with filtering on a form field - using Javascript ...

- 93 Posts
DavidJColbran Reply #1, 16 years, 8 months ago

for specific characters in the first few fields.

I was wondering if anyone can point me in the right direction as I’m beginning to lose the will to live ;-)

What I want to do is to use a JS to see if a website visitor is eligible for a particular service dependant on part of their postcode / zip - ie the first general part on the code. For example if they type L15****, or L16**** or L18**** (where the asterisk could be anything) and hit a submit button it pops up the alert box with a message saying "Yes eligible" (or displays a message on screen) but any other code returns "No sorry not eligible" - eg L19**** it returns nope.

I’ve looked at all sorts of validation checks but my programming skills are limited and I can’t hack anything or find a similar example anywhere. I’m guessing the eligible postcodes need to go in an array but I can’t figure it out. It needs to be Javascript rather than PHP as my it can only be client-side.

Any ideas people?

Thanks, David

93 Posts

DavidJColbran Reply #2, 16 years, 8 months ago

Managed to figure it out ...

<script>
function validate()
{
var str = document.getElementById("pc").value; // receives L16ABC
var pcode = str.substr(0,3); // gets L16 only
if (pcode == "L15" || pcode == "L16" || pcode == "L18")
alert ("Eligible")
else
alert ("Not Eligible");
}</script>

and the call from the form is;

<input type="text" name="pc" id="pc" />
<button name="mybutton" type="button" onclick="validate();" style="margin-left: 30px; color: #f00;">Check</button>