I am using Knockout.js to build a client-side view model. In my view model I would like to expose some functions that can be bound to elements in the page (typical MVVM model). I only want these functions to be called in response to a click event from a button, however they are been called when the view model is been constructed...
I have defined my model like this:
<script type=text/javascript>
var ViewModel = function(initialData) {
var self = this;
self.id = initialData;
self.isSubscribed = ko.observable(false);
self.name = ko.observable();
self.SubscribeToCategory = function () {
$.ajax({
url: '@Url.Action(Subscribe, Category)',
type: 'POST',
data: {
categoryId: self.id
},
success: function () {
self.isSubscribed(true);
},
failure: function () {
self.isSubscribed(false);
}
});
alert('Subscribing...');
};
self.UnsubscribeFromCategory = function () {
$.ajax({
url: '@Url.Action(Unsubscribe, Category)',
type: 'POST',
data: {
categoryId: self.id
},
success: function () {
self.isSubscribed(false);
},
failure: function () {
self.isSubscribed(true);
}
});
alert('Unsubscribing...');
};
self.LoadCategory = function () {
$.ajax({
url: '@Url.Action(GetCategory, Category)',
type: 'POST',
async: true,
data: {
categoryId: self.id
},
dataType: 'json',
success: function (data) {
self.isSubscribed(data.IsSubscribed);
self.name(data.Name);
}
});
};
self.LoadCategory();
};
$(document).ready(function () {
var data = '@Model';
var viewModel = new ViewModel(data);
ko.applyBindings(viewModel);
});
When I execute the code however, the two alerts fire automatically, but I am not expecting them to. I am using ASP MVC4, and the HTML that is using the view model is below:
<p>
ID: <span data-bind=text: id></span>
</p>
<div id=subscribe data-bind=visible: isSubscribed == false>
<button data-bind=click: SubscribeToCategory()>Subscribe</button>
</div>
<div id=unsubscribe data-bind=visible: isSubscribed == true>
<button data-bind=click: UnsubscribeFromCategory()>Unsubscribe</button>
</div>
<div>
Category Name: <span data-bind=text: name></span>
Is Subscribed: <span data-bind=text: isSubscribed></span>
</div>
I've looked through the tutorials online and some other knockout samples, as well as other places in my code where I have used knockout, but I cannot see why the two functions (SubscribeToCategory and UnsubscribeFromCategory) are firing on document load.
