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Viewing file:     checked.js (5.08 KB)      -rw-r--r--

(function() {

ko.bindingHandlers['checked'] = {
    'after': ['value', 'attr'],
    'init': function (element, valueAccessor, allBindings) {
        var checkedValue = ko.pureComputed(function() {
            // Treat "value" like "checkedValue" when it is included with "checked" binding
            if (allBindings['has']('checkedValue')) {
                return ko.utils.unwrapObservable(allBindings.get('checkedValue'));
            } else if (allBindings['has']('value')) {
                return ko.utils.unwrapObservable(allBindings.get('value'));
            }

            return element.value;
        });

        function updateModel() {
            // This updates the model value from the view value.
            // It runs in response to DOM events (click) and changes in checkedValue.
            var isChecked = element.checked,
                elemValue = useCheckedValue ? checkedValue() : isChecked;

            // When we're first setting up this computed, don't change any model state.
            if (ko.computedContext.isInitial()) {
                return;
            }

            // We can ignore unchecked radio buttons, because some other radio
            // button will be getting checked, and that one can take care of updating state.
            if (isRadio && !isChecked) {
                return;
            }

            var modelValue = ko.dependencyDetection.ignore(valueAccessor);
            if (valueIsArray) {
                var writableValue = rawValueIsNonArrayObservable ? modelValue.peek() : modelValue;
                if (oldElemValue !== elemValue) {
                    // When we're responding to the checkedValue changing, and the element is
                    // currently checked, replace the old elem value with the new elem value
                    // in the model array.
                    if (isChecked) {
                        ko.utils.addOrRemoveItem(writableValue, elemValue, true);
                        ko.utils.addOrRemoveItem(writableValue, oldElemValue, false);
                    }

                    oldElemValue = elemValue;
                } else {
                    // When we're responding to the user having checked/unchecked a checkbox,
                    // add/remove the element value to the model array.
                    ko.utils.addOrRemoveItem(writableValue, elemValue, isChecked);
                }
                if (rawValueIsNonArrayObservable && ko.isWriteableObservable(modelValue)) {
                    modelValue(writableValue);
                }
            } else {
                ko.expressionRewriting.writeValueToProperty(modelValue, allBindings, 'checked', elemValue, true);
            }
        };

        function updateView() {
            // This updates the view value from the model value.
            // It runs in response to changes in the bound (checked) value.
            var modelValue = ko.utils.unwrapObservable(valueAccessor());

            if (valueIsArray) {
                // When a checkbox is bound to an array, being checked represents its value being present in that array
                element.checked = ko.utils.arrayIndexOf(modelValue, checkedValue()) >= 0;
            } else if (isCheckbox) {
                // When a checkbox is bound to any other value (not an array), being checked represents the value being trueish
                element.checked = modelValue;
            } else {
                // For radio buttons, being checked means that the radio button's value corresponds to the model value
                element.checked = (checkedValue() === modelValue);
            }
        };

        var isCheckbox = element.type == "checkbox",
            isRadio = element.type == "radio";

        // Only bind to check boxes and radio buttons
        if (!isCheckbox && !isRadio) {
            return;
        }

        var rawValue = valueAccessor(),
            valueIsArray = isCheckbox && (ko.utils.unwrapObservable(rawValue) instanceof Array),
            rawValueIsNonArrayObservable = !(valueIsArray && rawValue.push && rawValue.splice),
            oldElemValue = valueIsArray ? checkedValue() : undefined,
            useCheckedValue = isRadio || valueIsArray;

        // IE 6 won't allow radio buttons to be selected unless they have a name
        if (isRadio && !element.name)
            ko.bindingHandlers['uniqueName']['init'](element, function() { return true });

        // Set up two computeds to update the binding:

        // The first responds to changes in the checkedValue value and to element clicks
        ko.computed(updateModel, null, { disposeWhenNodeIsRemoved: element });
        ko.utils.registerEventHandler(element, "click", updateModel);

        // The second responds to changes in the model value (the one associated with the checked binding)
        ko.computed(updateView, null, { disposeWhenNodeIsRemoved: element });

        rawValue = undefined;
    }
};
ko.expressionRewriting.twoWayBindings['checked'] = true;

ko.bindingHandlers['checkedValue'] = {
    'update': function (element, valueAccessor) {
        element.value = ko.utils.unwrapObservable(valueAccessor());
    }
};

})();