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pass to function

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Hi

I have a page with a dropdown list with value's from a db. When one item is selected a table with invoices changes.
I want to do the same if I put a value into a text field, but cannot get it to work. Something like:
<input type="text" onchange="getInvoices();" />. But how can I pass the entered value to the getInvoices() function?

This is the working code:

<select name="client_id" id="client_id" onchange="getInvoices();">
				<option value="null" selected="selected"><?php echo $this->lang->line('invoice_all_clients');?></option>
				<?php foreach($clientList->result() as $row): ?>
				<option value="<?php echo $row->id;?>"><?php echo $row->name;?></option>
				<?php endforeach; ?>
</select>
		

function getInvoices (elm) {

new Ajax.Request(base_url+'invoices/retrieveInvoices/', {postBody: Form.serialize($('filter')), onComplete: function(response) {

						if (response.responseText != '') {

							invoiceArray = eval('(' + response.responseText + ')');

							$('invoiceListings').style.position = "relative";

							$('invoiceListings').style.left = "0";

							$('invoiceListings').style.visibility = "visible";

							drawTable(invoiceArray);

						} else {

							$('invoiceListings').style.position = "absolute";

							$('invoiceListings').style.left = "-5000px";

							$('invoiceListings').style.visibility = "hidden";

						}

					}})

}

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pass to function hipa <hipa@telenet.be> - 2014-01-25 18:07 +0000
  Re: pass to function Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-01-25 19:24 +0100
  Re: pass to function hipa <hipa@telenet.be> - 2014-01-26 15:31 +0000
    Re: pass to function Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-01-26 17:58 +0100

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