Get selected item id in devexpress combobox using javascript -

i have devexpress combobx in view:

html.devexpress().combobox(s =>                                        {                                            s.name = idpola;                                            s.style.add("float", "left");                                            foreach (selectlistitem item in list)                                            {                                                s.properties.items.add(new listedititem()                                                {                                                    text = item.text,                                                    value = item.value,                                                    selected = item.value == selectedvalue                                                });                                            }                                            s.selectedindex = selectedindex;                                            s.properties.incrementalfilteringmode = incrementalfilteringmode.startswith;                                            s.clientvisible = controlvisible;                                            if (model.alternative)                                            {                                                s.properties.clientsideevents.selectedindexchanged =  "function(s, e){ffff(s)}";                                            }                                            else                                            {                                                s.properties.clientsideevents.selectedindexchanged = "function(s, e){hidetextbox(s,e)}";                                            }                                            s.properties.enableclientsideapi = true;                                        }).render(); 

how id of selected item using javascript in hidetextbox function?

use client-side getvalue method:

function hidetextbox(s, e) {     //s == combobox     var value = s.getvalue();     alert(value); }