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Viewing file:     event.js (2.38 KB)      -rw-r--r--

// For certain common events (currently just 'click'), allow a simplified data-binding syntax
// e.g. click:handler instead of the usual full-length event:{click:handler}
function makeEventHandlerShortcut(eventName) {
    ko.bindingHandlers[eventName] = {
        'init': function(element, valueAccessor, allBindings, viewModel, bindingContext) {
            var newValueAccessor = function () {
                var result = {};
                result[eventName] = valueAccessor();
                return result;
            };
            return ko.bindingHandlers['event']['init'].call(this, element, newValueAccessor, allBindings, viewModel, bindingContext);
        }
    }
}

ko.bindingHandlers['event'] = {
    'init' : function (element, valueAccessor, allBindings, viewModel, bindingContext) {
        var eventsToHandle = valueAccessor() || {};
        ko.utils.objectForEach(eventsToHandle, function(eventName) {
            if (typeof eventName == "string") {
                ko.utils.registerEventHandler(element, eventName, function (event) {
                    var handlerReturnValue;
                    var handlerFunction = valueAccessor()[eventName];
                    if (!handlerFunction)
                        return;

                    try {
                        // Take all the event args, and prefix with the viewmodel
                        var argsForHandler = ko.utils.makeArray(arguments);
                        viewModel = bindingContext['$data'];
                        argsForHandler.unshift(viewModel);
                        handlerReturnValue = handlerFunction.apply(viewModel, argsForHandler);
                    } finally {
                        if (handlerReturnValue !== true) { // Normally we want to prevent default action. Developer can override this be explicitly returning true.
                            if (event.preventDefault)
                                event.preventDefault();
                            else
                                event.returnValue = false;
                        }
                    }

                    var bubble = allBindings.get(eventName + 'Bubble') !== false;
                    if (!bubble) {
                        event.cancelBubble = true;
                        if (event.stopPropagation)
                            event.stopPropagation();
                    }
                });
            }
        });
    }
};