Disable Radio Button With knockout.js - radio-button

Question

How do I disable a radio button with knockout.js? I don't want the user to be able to select it. My template below isn't working.
<div id="answers" data-bind="template: { name: 'answerTmpl', data: interactive.answers }">
</div>
<script id="answerTmpl" type="text/html">
{{each(index, value) $data}}
<div>
<input type="radio" value="${index}" name="Answer" data-bind="disable: app.viewModel.avatars.speaking, checked: app.viewModel.interactive.answerSelected"/> <span>${value}</span>
</div>
{{/each}}
</script>
app.avatars.js
(function (app, $, undefined) {
app.viewModel = app.viewModel || {};
app.viewModel.avatars = {
speaking: ko.observable(false),
loaded: ko.observable(false)
};
app.interactive.js
(function (app, $, undefined) {
app.viewModel = app.viewModel || {};
app.viewModel.interactive = {
timeout: 1500,
answers: ko.observableArray(),
answerSelected: ko.observable(''),
correctAnswer: ko.observable(-1),
bookPage: ko.observable(1),
chapterEmail: ko.observable(''),
trialogue: {
inProgress: ko.observable(false),
response: ko.observable(''),
conversation: ko.observableArray()
}
};
app.interactive.init = function () {
ko.applyBindings(app.viewModel);
};

Answer 1

When you are using global variables instead of bound data, it looks like you need to explicitly evaluate the functions: http://jsfiddle.net/nFgnj/
<input type="radio" value="${index}" name="Answer"
data-bind="disable:app.viewModel.avatars.speaking(),
checked:app.viewModel.interactive.answerSelected()" />
I don't really like this solution, because it relies on app being a global variable.