'visible' binding with arrays issue

[Tomasz Płonka]

I have some JSON data returned from Ajax call that I first equip with the additional 'visible' field:

for (var index = 0; index < data.length; ++index) {
                    data[index].visible = ko.observable(false);

Later on, I construct my model:

model = {
          jsonData: ko.observableArray(data),

           clickClick: function (place) {
                  place.visible = true;
           }
         };

that is bound to the following:

<div id="map" class="map">
    <!-- ko foreach: jsonData -->
    <div class="marker" data-bind="attr: {'id': 'woeid' + $index()}">
        <div>
            <span data-bind="text: $data.name, click: $parent.clickClick"></span> (<span data-bind="text: $data.place_type"></span>): <span data-bind='text: $data.trends.length'>&nbsp;</span> trends
        </div>
        <ul data-bind="foreach: $data.trends, visible: $data.visible()">
            <li>
                <span data-bind="text: $data"></span>
            </li>
        </ul>
    </div>
    <!-- /ko -->

According to the initial value of the 'visible' field, lists are displayed or not, that's fine. However, clickClick() method changes the 'visible' field properly, but GUI is not updated. What am I doing wrongly?

[Gunnar Liljas]

It's an observable, you set the value like this:

place.visible(true);

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[Tomasz Płonka]

It's a function, got it.
But in this case, to track the value of the 'visible' I need another boolean property, or is there another way? In fact I want to toggle the value of 'visible'.

T.

[Gunnar Liljas]

place.visible() returns the value 

place.visible(value) sets the value.

So if you want to toggle it:

place.visible(!place.visible())

[Tomasz Płonka]

Ech, a function, you are right, thank you very much, thinking in c# properties at the moment.