asked on

CHECK FIRST 3 CHARACTERS OF TEXT STRING

Hi Experts,

I need to complete the code below so that if the first 3 characters of "formObj.medRefNo.value" are not "ABC" then the alert is called. Any ideas?

var val = formObj.medRefNo.value
if (code needed here!)
{
alert('You have entered an invalid medical reference number please call our customer services department on XXXXXXXXXX');
return false;
}

Thanks,

PJORDANNA

Batalf

Try

var val = formObj.medRefNo.value
if(!val.match(/^ABC.*$/g)){
alert('You have entered an invalid medical reference number please call our customer services department on XXXXXXXXXX');
return false;
}

Ramesh Srinivas

var val = formObj.medRefNo.value
if (val.subtr(0,1)='A') || (val.subtr(1,1)='B') || (val.subtr(2,1)='C')
{
alert('You have entered an invalid medical reference number please call our customer services department on XXXXXXXXXX');
return false;
}

Ramesh Srinivas

Sorry, i dunno if this is what you want.

var val = formObj.medRefNo.value
if (val.subtr(0,1)='A') && (val.subtr(1,1)='B') && (val.subtr(2,1)='C')
{
alert('You have entered an invalid medical reference number please call our customer services department on XXXXXXXXXX');
return false;
}

Ramesh Srinivas

Ahh, regular expression might be better way.

pjordanna

ASKER

Batalf,

Oops! - sorry. I forgot. formObj.medRefNo.value needs to be able to be blank also

so either "" or first 3 characters must = "ABC"

Thanks

PJORDANNA

ASKER CERTIFIED SOLUTION

Batalf

membership

This solution is only available to members.

To access this solution, you must be a member of Experts Exchange.

Start Free Trial

pjordanna

ASKER

Batalf,

Excellent work as usual.

PJORDANNA

Batalf

Glad I could help!

Just for your information, you can replace

if(!val.match(/^ABC.*$/g) && val!=""){

with

if(!val.match(/(^ABC.*$)|(^$)/g)){

if you like. i.e. everything in the same regexp.

But it doesn't make a difference on the end result.

Batalf