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Viewing file:     utils.domData.js (1.94 KB)      -rw-r--r--

ko.utils.domData = new (function () {
    var uniqueId = 0;
    var dataStoreKeyExpandoPropertyName = "__ko__" + (new Date).getTime();
    var dataStore = {};

    function getAll(node, createIfNotFound) {
        var dataStoreKey = node[dataStoreKeyExpandoPropertyName];
        var hasExistingDataStore = dataStoreKey && (dataStoreKey !== "null") && dataStore[dataStoreKey];
        if (!hasExistingDataStore) {
            if (!createIfNotFound)
                return undefined;
            dataStoreKey = node[dataStoreKeyExpandoPropertyName] = "ko" + uniqueId++;
            dataStore[dataStoreKey] = {};
        }
        return dataStore[dataStoreKey];
    }

    return {
        get: function (node, key) {
            var allDataForNode = getAll(node, false);
            return allDataForNode === undefined ? undefined : allDataForNode[key];
        },
        set: function (node, key, value) {
            if (value === undefined) {
                // Make sure we don't actually create a new domData key if we are actually deleting a value
                if (getAll(node, false) === undefined)
                    return;
            }
            var allDataForNode = getAll(node, true);
            allDataForNode[key] = value;
        },
        clear: function (node) {
            var dataStoreKey = node[dataStoreKeyExpandoPropertyName];
            if (dataStoreKey) {
                delete dataStore[dataStoreKey];
                node[dataStoreKeyExpandoPropertyName] = null;
                return true; // Exposing "did clean" flag purely so specs can infer whether things have been cleaned up as intended
            }
            return false;
        },

        nextKey: function () {
            return (uniqueId++) + dataStoreKeyExpandoPropertyName;
        }
    };
})();

ko.exportSymbol('utils.domData', ko.utils.domData);
ko.exportSymbol('utils.domData.clear', ko.utils.domData.clear); // Exporting only so specs can clear up after themselves fully