javascript - Load selected values in dropdown on selecting value from another dropdown -

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i have 2 dropdowns. when select value 1 dropdown load values in dropdown depending upon selected.

here html code

<select data-bind="options: filters, value: filter"></select>  <select data-bind="options: filtereditems, optionstext: 'name'"></select>

here knockout code

var viewmodel = function(data) { var self = this; self.filters = ko.observablearray(data.filters); self.filter = ko.observable(''); self.items = ko.observablearray(data.items); self.filtereditems = ko.computed(function() {     var filter = self.filter();     if (!filter || filter == "none") {         return self.items.slice(0, 6);     } else {         return self.items.slice(2);     }   }); };     var initialdata = {      filters: ["none", "old", "new", "super"],        items: [{ name: "corvette", type: "old"},        { name: "charger", type: "old"},        { name: "prius", type: "new"},        { name: "magnum", type: "new"},        { name: "mclaren", type: "super"},        { name: "saleen", type: "super"}]      ko.applybindings(new viewmodel(initialdata));

when select type none selects cars , if select type other none should select "charger" , "magnum"

here link fiddle

first of all, if want return items, return self.items(), slice not needed. if want return items matching filter, should work: 

self.filtereditems = ko.computed(function() {     var myfilter = self.filter();     if (!myfilter || myfilter == "none") {         return self.items();     } else {         var temparray = [];         for(i=0; i<self.items().length; i++) {             if(self.items()[i].type == myfilter) {                 temparray.push(self.items()[i]);             }         }         return temparray;     } });

check working fiddle.

if want select "charger" , "magnum" here goes:

self.filtereditems = ko.computed(function() {     var myfilter = self.filter();     if (!myfilter || myfilter == "none") {         return self.items();     } else {         return [ self.items()[1], self.items()[3] ];     } });

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