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How to create an autocomplete select box

form elements

How to create an autocomplete select box

by  nmath  Posted    (Edited  )
I wanted to create a text box that allowed a user to start typing a word and if it was in the select box it would auto-complete. This is the code that I used to solve the problem. There is a text box that as the user inputs characters it searches the select box for matches, also if the user selects a value from the select box the text box is auto filled.

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Code: 
<script language="javascript">
function fillin()
{
var mytext = Mainform.mytext.value;
sellength = Mainform.wholetext.length;
var i;

for(i = 0; i<sellength; i++)
{
   if (Mainform.wholetext.options[i].text.toLowerCase().indexOf(mytext.toLowerCase(),0) == 0)
     {Mainform.wholetext.options[i].selected = true;
     break;}
}

}

function filltext()
{
var selectedItem = Mainform.wholetext.selectedIndex;
var selectedText = Mainform.wholetext.options[selectedItem].text;

Mainform.mytext.value = selectedText;
} 
</script>

Here is the HTML section:
<form name = "Mainform">
<input type = "text" name = "mytext" onkeyup = "fillin()">

<select name = "wholetext" onclick = "filltext()">
 <option>Red</option>
 <option>Red Flowers</option>
 <option>Green</option>
 <option>Grass</option>
</select>
</form>
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