javascript - Verify values in combo box exist or don't exist? -

how can verify items listed in combo box? example want check if combo box have "item1" "item2" "item3". how output options out , check?

here's how excess combobox:

ext.componentquery.query('combobox[name=boxname]')[0]; 

just access store of box , interrogate it. example:

var store = ext.componentquery.query('combobox[name=boxname]')[0].getstore(); console.log(store.getbyid('item1')); 

if item1 not there result null.

update:

based on conditions lets say, want able validate combo box has "item1" , "item2", not more or less.

given variable target contains want in combo, can verify combo way:

var target = ['item1', 'item2'],     combo = ext.componentquery.query('combobox[name=boxname]')[0],     check = function(combo, target) {         var store = combo.getstore();         if (target.length !== store.gettotalcount()) {             return false;         }         var result = true;         store.each(function(item){             if (!ext.array.contains(target, item.getid())) {                 result = false;                 return false;             }         });         return result;     }; console.log(check(combo, target)); 

the method check return true if combo contains want, or false otherwise.