AUTO FILL TEXT BOX

I have a form in html and i want when someone press a number in "Phone" text box like 2106
i have a table with 3 columns "from" "to" "area " in a database-MYSQL or CSV-textfile
i want to check while pressing or when this text box lose focus to check ...

if phone > from and phone < to then show area in another text box else the other text box empty

*sorry for my english
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rockas1982Asked:
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Hugh McCurdyConnect With a Mentor Commented:
I'm not sure I understand yet.  Sounds like you are OK with the Javascript - right?

Do you need help searching SQL or XML?

Note: if you want to abandon this thread to award zero points and start a new thread with a different title (to attract more attention), I will not issue an objection.
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Hugh McCurdyCommented:
Unfortunately, I don't understand what you want.  Javascript is likely what you need to solve the problem.  I don't know how well you know Javascript so I'll direct you w3 schools.  Perhaps you can find something similar to what you want done and we can proceed from that point.

http://www.w3schools.com/js/
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rockas1982Author Commented:
look it's very simple

i have a form with 2 fields phone and location

when someone press on the phone a number like 5

i want to search a table or an array whatever is easier and search inside it

like this
select location where phone > from and phone < to
and i want the result to be shown in the second filed  
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rockas1982Author Commented:
Something like this

<html>
<head>
<script type="text/javascript">
function changetext(){
	var userInput = document.getElementById('phone').value;
	document.getElementById('area').value = userInput;
}
</script>
<input type='text' onKeyup='changetext()' id='phone' value='' />
<br>
<input type='text' id='area' value='' />

</body>
</html> 

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but i want the second value to be searched inside a table or inside an array
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