Is it possible to data-bind visible to the negation ("!") of a boolean ViewModel property?
knockout.js
Solution
When using an observable in an expression you need to access it as a function like:
`visible: !charted()`
Problem
I'd like to use a property on my ViewModel to toggle which icon to display without creating a separate computed property of the inverse. Is this possible? ``` <tbody data-bind="foreach: periods"> <tr> <td> <i class="icon-search" data-bind="visible: !charted, click: $parent.pie_it"></i> <i class="icon-remove" data-bind="visible: charted, click: $parent.pie_it"></i> </td> </tr> </tbody> ``` My ViewModel has a property periods which is an array of month, like this: ``` var month = function() { this.charted = ko.observable(false); }; ```