knockout.js - knockout js: range slider - syntax to change attribute -

i working range slider. slider has attribute slideroptions, 1 of values setting maximum range. cannot figure out if doing right way, syntax access element , change "max" value after user clicks link?

trying set value of 'max' after user clicks on product.

 <a href="#" onclick="setcategory(500)">set option 2</a> | <a href="#" onclick="setcategory(1000)">set option 2</a> 

the function trying call:

function setcategory(maxnum){    /// code stuck on    $('#numslider').attr('data-bind).slideroptions("max",maxnum); } 

the slider element:

 <div class="slider" data-bind="slider: numberamount, slideroptions: {min: 100, max: maxval, range: 'min', step: 10}" id="numslider"> </div> 

the code substantiate slider:

//slider

ko.bindinghandlers.slider = {   init: function (element, valueaccessor, allbindingsaccessor) {     var options = allbindingsaccessor().slideroptions || {};     $(element).slider(options);     ko.utils.registereventhandler(element, "slidechange", function (event, ui) {         var observable = valueaccessor();         observable(ui.value);     });     ko.utils.domnodedisposal.adddisposecallback(element, function () {         $(element).slider("destroy");     });     ko.utils.registereventhandler(element, "slide", function (event, ui) {         var observable = valueaccessor();         observable(ui.value);     });   },   update: function (element, valueaccessor) {     var value = ko.utils.unwrapobservable(valueaccessor());     if (isnan(value)) value = 0;     $(element).slider("value", value);      //console.log($(element).attr('data-bind'));   } }; 

those bindings not allow changing min- or max-values. if use knockout-jqueryui library instead, can though:

http://jsfiddle.net/3uvrh/

<div class="slider" data-bind="slider: { value: numberamount, min: 100, max: maxval,     range: 'min', step: 10}" id="numslider"></div> 

function viewmodel() {     var self = this;      self.numberamount = ko.observable(200);     self.maxval = ko.observable(500); }  $(function () {     var vm = new viewmodel();     window.viewmodel = vm;     ko.applybindings(vm); });  function setcategory(maxnum) {     var vm = window.viewmodel;     vm.maxval(maxnum); }