Ustawienie zmiennej bool

function moveSelectedArtist(productId, productType, discIndex, trackIndex, dstIdx, blockButton) {

    blockButton = true;
    var listView = $("#ArtistsListView").data("kendoListView");
    var dataSource = listView.dataSource;
    var oldListData = dataSource.data().map(function(item) {
        return item;
    });

    var srcUid = listView.select().data("uid");
    var srcItem = dataSource.getByUid(srcUid);
    
    var newListData = dataSource.data().filter(function(item) {
        return item != srcItem;
    });
    
    newListData.splice(dstIdx, 0, srcItem);    
    
    var isArtistOrderCorrect = checkIsArtistOrderCorrect(oldListData, newListData);

    if(isArtistOrderCorrect) {
        dataSource.remove(srcItem);
        dataSource.insert(dstIdx, srcItem);
        $('#ArtistsListView').closest('.listViewContent').data("selected-artist-index", dstIdx);
        $("#ArtistsListView").data("kendoListView").select($("#ArtistsListView").data("kendoListView").element.children()[dstIdx]);
    }

    var listData = {
        productId: productId,
        productType: productType,
        discIndex: discIndex,
        trackIndex: trackIndex,
        productArtists: JSON.stringify(dataSource.data())
    };

    saveArtistsInOrder(listData);
    blockButton = false;
}

function moveSelectedArtistUp(productId, productType, discIndex, trackIndex) {

    if (blockButton == false) {
        var dstIdx = $("#ArtistsListView").data("kendoListView").select().index() - 1;

        if (dstIdx >= 0) {
            moveSelectedArtist(productId, productType, discIndex, trackIndex, dstIdx);
        }
    }

}