check if first char is a letter

crmpicco · #1 (**permalink**) October 18th, 2005, 09:48 AM

Code:

seat_zelle.innerHTML = "<input type=text id=specify"+s+" name=specify"+s+" class=selects size=5 onKeyUp='this.value=this.value.toUpperCase();'/>";

I am building this textbox in innerHTML, how can i put a condition on it so that it detects what is inputted so that if the first char that is entered
is a LETTER then it alerts the user?

Picco

www.crmpicco.co.uk

ChrisScott · #2 (**permalink**) October 18th, 2005, 10:32 AM

onKeyUp='this.value=this.value.toUpperCase();' if(/^[a-z]/i.test(this.value)){alert(\"first char is a letter\")};'

HTH,

Chris

crmpicco · #3 (**permalink**) October 19th, 2005, 11:34 AM

thanks for that chris, have you got a function that will check if AT LEAST ONE character in a textbox is a letter?

www.crmpicco.co.uk

ChrisScott · #4 (**permalink**) October 20th, 2005, 04:54 AM

Sure...

Code:

onkeyup="if(/^.*[a-z].*/i.test(this.value)){alert('at least one letter')};"

If you're going to be doing a lot of string comparisons, I'd highly recommend a look at regular expressions.

Cheers,

Chris

crmpicco · #5 (**permalink**) October 20th, 2005, 05:20 AM

thanks again chris, trying to think of a function name. ive got function IsNumeric(sText,id) to check for numeric fields IsAlpha is A-Z AND 0-9 got a name for letters only (A-Z) :-) LOL

www.crmpicco.co.uk

crmpicco · #6 (**permalink**) October 20th, 2005, 05:25 AM

Code:

                seat_zelle.innerHTML = "<input type='text' id='specify"+s+"' name='specify"+s+"' "+
                                       "title='Insert Seat Number for Pax: "+ passagier + " " + passNo + " / Segment "+ parseFloat(s+1) +"' "+
                                       "class='selects' size='5' onBlur='containsLetter(this.value,this.id); concatSeats(this.value,"+passNo+",this.id,"+pass+");' onKeyUp='this.value=this.value.toUpperCase(); return IsNumeric(this.value,this.id);' />";

function containsLetter(sText,id)
{
    if(/^.*[A-Z].*/i.test(this.value))
    {
        alert("The Seat must contain at least one letter");
        return false;
    }
}

Can't seem to get it working with this code above???

www.crmpicco.co.uk

crmpicco · #7 (**permalink**) October 20th, 2005, 05:39 AM

Code:

                seat_zelle.innerHTML = "<input type='text' id='specify"+s+"' name='specify"+s+"' "+
                                       "title='Insert Seat Number for Pax: "+ passagier + " " + passNo + " / Segment "+ parseFloat(s+1) +"' "+
                                       "class='selects' size='5' onBlur='if(!/^.*[a-z].*/i.test(this.value)){alert('The Seat must contain a letter')}; concatSeats(this.value,"+passNo+",this.id,"+pass+");' "+
                                       "onKeyUp='this.value=this.value.toUpperCase(); return IsNumeric(this.value,this.id);' />";

Getting an syntax error with this code.
Doesnt seem to like anything inside quotes for the alert. Can i send it to a fucntion to check then alert?

www.crmpicco.co.uk

crmpicco · #8 (**permalink**) October 20th, 2005, 05:42 AM

Code:

                seat_zelle.innerHTML = "<input type='text' id='specify"+s+"' name='specify"+s+"' "+
                                       "title='Insert Seat Number for Pax: "+ passagier + " " + passNo + " / Segment "+ parseFloat(s+1) +"' "+
                                       "class='selects' size='5' onBlur='if(!/^.*[a-z].*/i.test(this.value)){alertUser();}; concatSeats(this.value,"+passNo+",this.id,"+pass+");' "+
                                       "onKeyUp='this.value=this.value.toUpperCase(); return IsNumeric(this.value,this.id);' />";
function alertUser()
{
    alert("The Seat must contain a letter for the row identifer");
    return false;
}

this works, but can i do the validation and the alert in one function?

thanks.

picco

www.crmpicco.co.uk

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