How to add a "clicked" condition in knockout.js css-binding?

@raphael_tillman 

To add a "clicked" condition in a knockout.js css-binding, you can use a computed observable in your view model to track whether an element has been clicked. Here is an example:

1. In your HTML file, bind the css class to the computed observable in your view model:

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<div data-bind="css: { 'clicked': isClicked }">Click me</div>

1. In your JavaScript file, create a view model with a computed observable to track the "clicked" condition:

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var ViewModel = function() {
    var self = this;

    // Observable to track if the element has been clicked
    self.isClicked = ko.observable(false);

    // Computed observable to add or remove the "clicked" class based on the isClicked value
    self.clickedClass = ko.pureComputed(function() {
        return self.isClicked() ? 'clicked' : '';
    });

    // Function to handle the click event
    self.handleClick = function() {
        self.isClicked(!self.isClicked());
    };
};

// Apply the bindings
ko.applyBindings(new ViewModel());

In this example, the computed observable clickedClass returns the "clicked" class if the isClicked observable is true, and an empty string if it is false. The view model also includes a handleClick function to toggle the value of isClicked when the element is clicked.

By using this approach, you can add a "clicked" condition in a knockout.js css-binding.