Mvvm dropdwonlist in kendoui - mvvm

Question

I have a dropdownlist in my page this is the code:
<div id="test">
Role: <span data-bind="text: role"></span>
</br>
Roles:<select id="roles" data-bind="source: roles, value: role" data-text-field="roleName" data-value-field="roleId" ></select>
<ul id="view" data-template="Access-template" data-role="listview" data-bind="source:Accesses"></ul>
<script id="Access-template" type="text/x-kendo-template">
<li>
<input type="checkbox" data-bind="checked: selected" />
<label data-bind="text: AccessName" />
</li>
</script>
</div>​
and I want that when I change the dropdownlist value it changes my role collection. This is my code:
var Accesses = [{
AccessName: 'Create',
selected: false
}, {
AccessName: 'Delete',
selected: false
}, {
AccessName: 'Update',
selected: true
}];
var Roles = [{
roleName: "Admin",
roleId: 1,
accessItem: Accesses
}, {
roleName: "User",
roleId: 2,
accessItem: Accesses
}];
var viewModel = kendo.observable({
roles: Roles,
accssesItem: Roles.accessItem
});
kendo.bind($("#test"), viewModel);

Answer 1

Figuring out what DropDown item is selected is a little... unintuitive, but here is what you want:
<script id="Access-template" type="text/x-kendo-template">
<li>
<input type="checkbox" data-bind="checked: selected" />
<label data-bind="text: AccessName" />
</li>
</script>
<select
data-role="dropdownlist"
data-bind="source: roles, events: { select: roleSelected }"
data-text-field="roleName"
data-value-field="roleId"></select>
<ul data-template="Access-template"
data-role="listview"
data-bind="source: accessItem"></ul>
...and...
$(document).ready(function () {
var roles = [{
roleName: "Admin",
roleId: 1,
accessItem: [{
AccessName: 'Create',
selected: true
}, {
AccessName: 'Delete',
selected: true
}, {
AccessName: 'Update',
selected: true
}]
}, {
roleName: "User",
roleId: 2,
accessItem: [{
AccessName: 'Create',
selected: false
}, {
AccessName: 'Delete',
selected: false
}, {
AccessName: 'Update',
selected: true
}]
}];
var viewModel = kendo.observable({
roles: roles,
accessItem: roles[0].accessItem,
roleSelected: function (e) {
this.set("accessItem", this.roles[e.item.index()].accessItem);
}
});
kendo.bind("body", viewModel);
});
Working jsFiddle here: http://jsfiddle.net/rally25rs/JHNm6/