Combo box in HTML form?

I'm making a form with HTML--I'm still learning, but I haven't found a way to have a scroll menu that lets you choose OR enter a new value that then gets added to list. I've done something like this with databases (I think it's called a combo box), I'm just not sure whether it's do-able with HTML.

Example: I want a user to enter a species name. They can choose from maple, birch, or hickory. But this year, there's a new species to consider: tulip. How can I make it so that the visitor can enter this value that is not already on the list? And is it possible to have this new value automatically appended to the list?

Here's what I have so far:  


    <select name="menu" size="3" multiple>

        <option value="1">maple</option>

        <option value="2">hickory</option>

        <option value="3">birch</option>

    </select>

</form>

Thanks in advance for your help.

-Krystle
KrystleBlairAsked:
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seanpowellConnect With a Mentor Commented:
Have a read through this:
http://www.cs.tut.fi/~jkorpela/forms/combo.html
Let us know if you need more info...

Thanks,
Sean

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garethdart24Commented:
You could use a javascript solution:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>
<head>
<title>Untitled</title>
<style>
</style>
<script language = "javascript">
<!--
var firstBit1 = "<select name='menu' id = 'menu' size='";
var firstBit2 = "' multiple='multiple'>";
var orig_conts = "<option selectec value='1'>maple<option value='2'>hickory<option value='3'>birch</option>";
var lastBit = "</select>";
var size = 3;
var x = 3;

function initRefresh() {

//replace size with x to make the dropdown list increase in vertical size with each selection
document.getElementById('div').innerHTML = firstBit1 + size + firstBit2 + orig_conts + lastBit;

}

function addItem() {

x++;
orig_conts =  "<option value = '" + x + "'>" + document.form.add.value + "</option>" + orig_conts;
initRefresh();
document.form.add.value = "";
document.form.menu.selectedIndex = 0;

}

//-->
</script>
</head>
<body onload = "initRefresh()">
<form name = "form" id = "form">
<div name = "div" id = "div"></div>
<input type = "text" name = "add" id = "add"><br>
<input type = "button" value = "Click" onclick = "addItem()">

</form>
</body>
</html>

Hope that's helpful,

G
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