Need Help Combo box ExtJS 3

[mamay08]

hey guys, i really need your help..
i have combo box with ds_bunga store looks like this:
kasus.jpg


table structure in Mysql looks like this:
id | nama_bunga | harga_satuan
, my question is how i can get "harga_satuan" value automatically into my "harga_satuan" field since i select "nama_bunga".
my friend tell me tu use "listeners", i dont really understand the concept.
this is my combo box code:

 {
                xtype: 'gridcolumn',
                dataIndex:'nama_bunga',
                selectOnFocus:true,
                header: 'nama_bunga',
                sortable: true,
                width: 100,
                editor: {
                    xtype: 'combo',
                    store:ds_bunga_faktur, 
                    displayField:'nama_bunga',
                    valueField:'nama_bunga',
                    triggerAction:'all', 
                    typeAhead:true,
                    mode:'local'
                }
            },

please help me guys

[aacoro]

Did you checked out the API? Link:

sample code:

var cb = new Ext.form.ComboBox({    // all of your config options    listeners:{         scope: yourScope,         'select': yourFunsction    }});

yourFunction can have 3 parameters (see API). Or you can use:

onSelect: function(record){            // do something with your record        }

Good luck!