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Viewing file:     foreach.js (2.29 KB)      -rw-r--r--

// "foreach: someExpression" is equivalent to "template: { foreach: someExpression }"
// "foreach: { data: someExpression, afterAdd: myfn }" is equivalent to "template: { foreach: someExpression, afterAdd: myfn }"
ko.bindingHandlers['foreach'] = {
    makeTemplateValueAccessor: function(valueAccessor) {
        return function() {
            var modelValue = valueAccessor(),
                unwrappedValue = ko.utils.peekObservable(modelValue);    // Unwrap without setting a dependency here

            // If unwrappedValue is the array, pass in the wrapped value on its own
            // The value will be unwrapped and tracked within the template binding
            // (See https://github.com/SteveSanderson/knockout/issues/523)
            if ((!unwrappedValue) || typeof unwrappedValue.length == "number")
                return { 'foreach': modelValue, 'templateEngine': ko.nativeTemplateEngine.instance };

            // If unwrappedValue.data is the array, preserve all relevant options and unwrap again value so we get updates
            ko.utils.unwrapObservable(modelValue);
            return {
                'foreach': unwrappedValue['data'],
                'as': unwrappedValue['as'],
                'includeDestroyed': unwrappedValue['includeDestroyed'],
                'afterAdd': unwrappedValue['afterAdd'],
                'beforeRemove': unwrappedValue['beforeRemove'],
                'afterRender': unwrappedValue['afterRender'],
                'beforeMove': unwrappedValue['beforeMove'],
                'afterMove': unwrappedValue['afterMove'],
                'templateEngine': ko.nativeTemplateEngine.instance
            };
        };
    },
    'init': function(element, valueAccessor, allBindings, viewModel, bindingContext) {
        return ko.bindingHandlers['template']['init'](element, ko.bindingHandlers['foreach'].makeTemplateValueAccessor(valueAccessor));
    },
    'update': function(element, valueAccessor, allBindings, viewModel, bindingContext) {
        return ko.bindingHandlers['template']['update'](element, ko.bindingHandlers['foreach'].makeTemplateValueAccessor(valueAccessor), allBindings, viewModel, bindingContext);
    }
};
ko.expressionRewriting.bindingRewriteValidators['foreach'] = false; // Can't rewrite control flow bindings
ko.virtualElements.allowedBindings['foreach'] = true;