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simple.js
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1295 lines (1039 loc) · 42 KB
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ko.bindingHandlers.numeric = {
init: function (element, valueAccessor, allBindingsAccessor) {
$(element).numeric();
$(element).change(function () {
var observable = valueAccessor();
observable(parseFloat($(element).val()));
});
},
update: function (element, valueAccessor) {
var value = ko.utils.unwrapObservable(valueAccessor()),
$el = $(element);
var current = parseFloat($el.val());
if ((value != undefined) && (value - current !== 0)) {
$el.val(value);
}
}
};
ko.bindingHandlers.datepicker = {
init: function (element, valueAccessor, allBindingsAccessor) {
//initialize datepicker with some optional options
var options = allBindingsAccessor().datepickerOptions || {},
$el = $(element);
var onDateChange = function () {
var observable = valueAccessor();
observable($el.datepicker("getDate"));
};
options.onSelect = onDateChange;
$el.change(onDateChange);
$el.mask("9999-99-99");
$el.datepicker(options);
//handle disposal (if KO removes by the template binding)
ko.utils.domNodeDisposal.addDisposeCallback(element, function () {
$el.datepicker("destroy");
});
},
update: function (element, valueAccessor) {
var value = ko.utils.unwrapObservable(valueAccessor()),
$el = $(element);
//handle date data coming via json from Microsoft
if (String(value).indexOf('/Date(') == 0) {
value = new Date(parseInt(value.replace(/\/Date\((.*?)\)\//gi, "$1")));
}
var current = $el.datepicker("getDate");
if ((value != undefined) && (value - current !== 0)) {
$el.datepicker("setDate", value);
}
}
};
ko.bindingHandlers.timepicker = {
init: function (element, valueAccessor, allBindingsAccessor) {
var $el = $(element);
$el.mask("99:99");
},
update: function (element, valueAccessor) {
}
};
var databaseTableTool = new tools.DatabaseTable(),
filterTool = new tools.Filter(),
statsTool = new tools.Summarize(),
joinTool = new tools.Join(),
selectTool = new tools.Select();
var SimpleQueryBuilderViewModel = function () {
var self = this;
var formatNumber = function (num) {
nStr = num + '';
x = nStr.split('.');
x1 = x[0];
x2 = x.length > 1 ? '.' + x[1] : '';
var rgx = /(\d+)(\d{3})/;
while (rgx.test(x1)) {
x1 = x1.replace(rgx, '$1' + ',' + '$2');
}
return x1 + x2;
};
self.currentData = ko.observable();
self.currentDataColumns = ko.observable();
self.currentRowStart = ko.observable();
self.currentRowStartFormatted = ko.computed(function () {
return formatNumber(self.currentRowStart());
});
self.currentRowEnd = ko.observable();
self.currentRowEndFormatted = ko.computed(function () {
return formatNumber(self.currentRowEnd());
});
self.currentRowsTotal = ko.observable();
self.currentRowsTotalFormatted = ko.computed(function () {
return formatNumber(self.currentRowsTotal());
});
self.dataPageSize = ko.observable(10);
self.isPreviousVisible = ko.computed(function () {
if (self.currentRowStart() != null) {
return self.currentRowStart() > 1;
}
else {
return false;
}
});
self.isNextVisible = ko.computed(function () {
if (self.currentRowEnd() != null) {
return self.currentRowEnd() < self.currentRowsTotal();
}
else {
return false;
}
});
self.navigateStart = function () {
if (self.selectedNode()) {
//events.FetchSelectedNodeData(0, models.DataPageSize());
self.refresh(0);
}
}
self.navigateEnd = function () {
if (self.selectedNode()) {
var start = (parseInt(self.currentRowsTotal() / self.dataPageSize()) * self.dataPageSize());
if (start == self.currentRowsTotal()) {
start -= self.dataPageSize();
}
var count = self.currentRowsTotal() - start;
//events.FetchSelectedNodeData(start, count);
self.refresh(start);
}
}
self.navigateNext = function () {
if (self.selectedNode()) {
//events.FetchSelectedNodeData(self.CurrentRowStart() - 1 + self.DataPageSize(), self.DataPageSize());
self.refresh(self.currentRowStart() - 1 + self.dataPageSize());
}
}
self.navigatePrev = function () {
if (self.selectedNode()) {
//events.FetchSelectedNodeData(self.CurrentRowStart() - 1 - self.DataPageSize(), self.DataPageSize());
self.refresh(self.currentRowStart() - 1 - self.dataPageSize());
}
}
self.section = ko.observable(1);
self.serverQueryKey = ko.observable();
self.filtersAllowed = ko.observable(false);
self.statisticsAllowed = ko.observable(false);
self.GetNodeById = function (id) {
if (self.dataTable() && self.dataTable().Id == id) {
return self.dataTable();
}
if (self.select() && self.select().Id == id) {
return self.select();
}
var matches = self.dataTables()
.filter(function (item) { return item.Id == id; });
if (matches.length > 0) {
return matches[0];
}
matches = self.joins()
.filter(function (item) { return item.Id == id; });
if (matches.length > 0) {
return matches[0];
}
matches = self.filters()
.filter(function (item) { return item.Id == id; });
if (matches.length > 0) {
return matches[0];
}
if (self.statistics() && self.statistics().Id == id) {
return self.statistics();
}
return null;
}
self.dataTable = ko.observable(new nodes.DatabaseTable({ Name: "Data Source", Tool: databaseTableTool }));
self.dataTable().selectedColumns = ko.observableArray();
self.dataTable().rowCount = ko.observable();
self.dataTable().selectedColumnCount = ko.pureComputed(function () {
return self.dataTable().selectedColumns().filter(function (col) { return col.checked() }).length;
}, self);
self.select = ko.observable(new nodes.Select({ Name: "Select", Tool: selectTool }));
self.select().showColumns = ko.observable(false);
self.dataTable().apply = function () {
var includedIndexes = [];
var index = 0;
if (self.dataTable().selectedColumns().some(function (item) { return item.checked(); })) {
$.each(self.dataTable().selectedColumns(), function (j, column) {
if (column.checked()) {
includedIndexes.push(index);
}
index++;
});
}
$.each(self.dataTables(), function (i, table) {
$.each(table.selectedColumns(), function (j, column) {
if (column.checked()) {
includedIndexes.push(index);
}
index++;
});
});
$.each(self.joins(), function (i, join) {
join.CalculateColumns();
});
// make record of columns that have changed
var columnRemovals = [];
var columnTranspositions = [];
var updateColumnsAfterChanges = self.select().IncludedColumnIndexes().length > includedIndexes.length;
$.each(self.select().IncludedColumnIndexes(), function (oldPosition, columnIndex) {
var newPosition = includedIndexes.indexOf(columnIndex);
if (newPosition >= 0) {
if (newPosition != oldPosition) {
columnTranspositions.push([oldPosition, newPosition]);
}
} else {
columnRemovals.push(oldPosition);
}
});
var statisticsCalculateIndexes = [],
statisticGroupByIndexes = []
if (self.statistics()) {
statisticsCalculateIndexes = self.statistics()
.Statistics()
.map(function (item) { return item.AggColumn(); });
statisticGroupByIndexes = self.statistics()
.GroupByColumns()
.map(function (item) { return item.index(); });
}
self.select().IncludedColumnIndexes(includedIndexes);
// update columns
if (!updateColumnsAfterChanges) {
self.select().CalculateColumns();
$.each(self.filters(), function (i, filter) {
filter.SetColumns(self.select().Columns().slice(), self.select().ColumnTypes().slice());
});
}
// manage column changes in subsequent tools
var i = self.filters().length - 1;
while (i >= 0) {
var currentFilter = self.filters()[i];
if (columnRemovals.indexOf(currentFilter.FilterColumnIndex()) >= 0) {
self.removeFilter(i);
} else {
var transpositions = columnTranspositions.filter(function (item) { return item[0] == currentFilter.FilterColumnIndex(); });
if (transpositions.length > 0) {
currentFilter.FilterColumnIndex(transpositions[0][1]);
}
}
i--;
}
// update columns
if (updateColumnsAfterChanges) {
self.select().CalculateColumns();
$.each(self.filters(), function (i, filter) {
filter.SetColumns(self.select().Columns().slice(), self.select().ColumnTypes().slice());
});
}
if (self.statistics()) {
i = statisticGroupByIndexes.length - 1;
while (i >= 0) {
var groupBy = self.statistics().GroupByColumns()[i];
if (columnRemovals.indexOf(statisticGroupByIndexes[i]) >= 0) {
self.statistics().RemoveGroupBy(groupBy);
} else {
var transpositions = columnTranspositions.filter(function (item) { return item[0] == statisticGroupByIndexes[i]; });
if (transpositions.length > 0) {
groupBy.index(transpositions[0][1]);
}
}
i--;
}
i = statisticsCalculateIndexes.length - 1;
while (i >= 0) {
var calculate = self.statistics().Statistics()[i];
if (columnRemovals.indexOf(statisticsCalculateIndexes[i]) >= 0) {
if (self.statistics().Statistics().length == 1) {
self.removeStatistics();
} else {
self.statistics().RemoveStatistic(calculate);
}
} else {
var transpositions = columnTranspositions.filter(function (item) { return item[0] == statisticsCalculateIndexes[i]; });
if (transpositions.length > 0) {
calculate.AggColumn(transpositions[0][1]);
}
}
i--;
}
}
self.refresh(0, function (success) {
if (success) {
self.goToNextSection();
}
});
};
var innerLoadTables = self.dataTable().loadTables;
self.dataTable().loadTables = function() {
innerLoadTables(function () {
})
}
self.joins = ko.observableArray();
self.dataTables = ko.observableArray();
var joinSeed = 1;
self.filters = ko.observableArray();
self.filters.subscribe(function(changes) {
if(changes[0].status === 'deleted' && self.filters().length === 0) {
self.applyFilters();
}
}, null, "arrayChange");
var filterSeed = 1;
self.addFilter = function (settings) {
var newFilter = new nodes.Filter({ Name: 'Filter ' + filterSeed, Tool: filterTool });
filterSeed += 1;
var input = null;
if (self.filters().length > 0) {
input = self.filters()[self.filters().length - 1];
} else {
input = self.select();
}
newFilter.Inputs([input.Id]);
newFilter.OnInputsUpdated(self);
if (settings) {
// do not try to load input ids as we know what it will be
settings.Inputs[0] = input.Id;
newFilter.LoadSettings(settings, self);
}
newFilter.SetColumns(self.select().Columns().slice(), self.select().ColumnTypes().slice());
self.filters.push(newFilter);
if (self.statistics()) {
self.statistics().Inputs([newFilter.Id]);
self.statistics().OnInputsUpdated(self);
}
};
self.removeFilter = function (index) {
if (0 <= index && index < self.filters().length) {
var prev = null;
if (0 <= index - 1 && index - 1 < self.filters().length) {
prev = self.filters()[index - 1];
} else {
prev = self.select();
}
var next = null;
if (0 <= index + 1 && index + 1 < self.filters().length) {
next = self.filters()[index + 1];
} else {
next = self.statistics();
}
if (prev && next) {
// make sure settings aren't lost
var settings = next.GetSaveSettings();
settings.Inputs[0] = prev.Id;
next.Inputs([prev.Id]);
next.OnInputsUpdated(self);
next.LoadSettings(settings, self);
}
self.filters.splice(index, 1);
self.filterError(null);
}
};
self.goToNextSection = function () {
self.section(self.section() + 1);
if (self.section() == 2) {
self.filtersAllowed(true);
}
if (self.section() == 3) {
self.statisticsAllowed(true);
}
};
self.filteredRowCount = ko.observable();
self.filterError = ko.observable();
self.applyFilters = function () {
var ids = [];
$.each(self.filters(), function(i, filter) {
if (filter.ShowFilterCompareValue1() && !filter.FilterValue1()) {
ids.push(i + 1);
} else if (filter.ShowFilterCompareNumeric() && !$.isNumeric(filter.FilterValue1())) {
ids.push(i + 1);
} else if (filter.ShowFilterCompareDatetime() && (!filter.FilterDateValue1() || !filter.FilterTimeValue1())) {
ids.push(i + 1);
}
});
if (ids.length == 1) {
if (ids.length == self.filters().length) {
self.filterError('Please enter a value for your filter');
} else {
self.filterError('Please enter a value for filter ' + ids[0]);
}
} else if (ids.length > 1) {
self.filterError('Please enter a value for filters: ' + ids.join(', '));
} else {
self.filterError(null);
self.refresh(0, function (success) {
if (success) {
self.goToNextSection();
}
});
}
};
self.statistics = ko.observable();
self.addStatistic = function (settings) {
if (self.statistics()) {
self.statistics().AddStatistic();
}
if (!self.statistics()) {
var statistics = new nodes.Summarize({ Name: "Statistics", Tool: statsTool });
var input = null;
if (self.filters().length > 0) {
input = self.filters()[self.filters().length - 1];
} else {
input = self.select();
}
statistics.Inputs([input.Id]);
statistics.OnInputsUpdated(self);
if (settings) {
// do not try to load input ids as we know what it will be
settings.Inputs[0] = input.Id;
}
if (settings) {
statistics.LoadSettings(settings, self);
}
statistics.rowCount = ko.observable();
self.statistics(statistics);
}
};
self.removeStatistics = function () {
self.statistics(null);
};
self.applyStatistics = function() {
self.refresh(0, function (success) {
if (success) {
self.goToNextSection();
}
});
}
self.changeDataSource = function () {
self.loadJoinStructure();
}
self.loadJoinStructure = function (settings, callback) {
self.dataTables.removeAll();
self.joins.removeAll();
self.filters.removeAll();
self.filteredRowCount(null);
self.statistics(null);
var settingNode = settings;
backend.GetJoins(self.dataTable().Table(), function (data) {
self.dataTable().SetColumns(data.columns, data.columnTypes);
var cols = [];
$.each(data.columns, function (i, col) {
var checked = data.showColumns[i];
if (settingNode) {
checked = settingNode.selectedColumns.indexOf(col) >= 0;
}
cols.push({
name: ko.observable(col),
show: ko.observable(data.showColumns[i]),
checked: ko.observable(checked)
});
});
self.dataTable().selectedColumns(cols);
if (settingNode) {
settingNode = settingNode.next;
}
var depthFirstSearch = function (joinStructure, curr, children) {
$.each(joinStructure.parents, function (i, parent) {
var joinSettings = null;
if (settingNode && settingNode.Type == 'Join' && settingNode.dataSource && settingNode.dataSource.Table == parent.displayName) {
joinSettings = settingNode;
}
// add data table
var newJoinDataTable = new nodes.DatabaseTable({ Name: 'Join Table ' + joinSeed, Tool: databaseTableTool });
newJoinDataTable.Tables(self.dataTable().Tables());
newJoinDataTable.Table(parent.displayName);
newJoinDataTable.SetColumns(parent.columns, parent.columnTypes);
var cols = [];
$.each(parent.columns, function (i, col) {
var checked = false;
if (joinSettings) {
checked = joinSettings.dataSource.selectedColumns.indexOf(col) >= 0;
}
cols.push({
name: ko.observable(col),
show: ko.observable(parent.showColumns[i]),
checked: ko.observable(checked)
});
});
newJoinDataTable.selectedColumns = ko.observableArray(cols);
newJoinDataTable.selectedColumnCount = ko.pureComputed(function () {
return newJoinDataTable.selectedColumns().filter(function (col) { return col.checked() }).length;
}, newJoinDataTable);
newJoinDataTable.checked = ko.pureComputed({
read: function () {
return newJoinDataTable.selectedColumnCount() > 0;
},
write: function (value) {
$.each(newJoinDataTable.selectedColumns(), function (i, col) {
if (value) {
col.checked(col.show());
} else {
col.checked(false);
}
});
},
owner: newJoinDataTable
});
self.dataTables.push(newJoinDataTable);
// add join
var newJoin = new nodes.Join({ Name: 'Join ' + joinSeed, Tool: joinTool });
newJoin.children = children;
var lastInput = null;
if (self.joins().length > 0) {
lastInput = self.joins()[self.joins().length - 1];
} else {
lastInput = self.dataTable();
}
newJoin.Inputs([lastInput.Id, newJoinDataTable.Id]);
newJoin.OnInputsUpdated(self);
newJoin.JoinType("LeftOuter"); // left join
newJoin.Table1Column(parent.childJoinColumn);
newJoin.Table2Column(parent.parentJoinColumn);
newJoin.CalculateColumns();
self.joins.push(newJoin);
joinSeed += 1;
if (joinSettings) {
settingNode = joinSettings.next;
}
depthFirstSearch(parent, newJoin, children.concat([newJoin.Id]));
});
};
depthFirstSearch(data, self.dataTable(), [self.dataTable().Id]);
var lastInput = null;
if (self.joins().length > 0) {
lastInput = self.joins()[self.joins().length - 1];
} else {
lastInput = self.dataTable();
}
self.select().Inputs([lastInput.Id]);
self.select().OnInputsUpdated(self);
var includedIndexes = [];
var index = 0;
if (self.dataTable().selectedColumns().some(function (item) { return item.checked(); })) {
$.each(self.dataTable().selectedColumns(), function (j, column) {
if (column.checked()) {
includedIndexes.push(index);
}
index++;
});
}
$.each(self.dataTables(), function (i, table) {
$.each(table.selectedColumns(), function (j, column) {
if (column.checked()) {
includedIndexes.push(index);
}
index++;
});
});
self.select().IncludedColumnIndexes(includedIndexes);
self.select().CalculateColumns();
$.each(self.filters(), function (j, filter) {
filter.SetColumns(self.select().Columns(), self.select().ColumnTypes());
});
if (callback) {
callback();
} else {
self.refresh(0);
}
})
};
self.getSaveSettings = function () {
var data = {
Nodes: []
}
var joinIds = [];
$.each(self.joins(), function (i, joinNode) {
if (joinNode.InputRefs()) {
var tableNode = joinNode.InputRefs()[1];
if (tableNode.selectedColumnCount() > 0) {
if ($.inArray(joinNode.Id, joinIds) < 0) {
joinIds.push(joinNode.Id);
}
$.each(joinNode.children, function (j, nodeId) {
if ($.inArray(nodeId, joinIds) < 0) {
joinIds.push(nodeId);
}
})
}
}
})
var includedIndexes = [];
var index = 0;
$.each(self.dataTable().selectedColumns(), function (j, column) {
if (column.checked()) {
includedIndexes.push(index);
}
index++;
});
$.each(self.joins(), function (i, joinNode) {
if ($.inArray(joinNode.Id, joinIds) >= 0 && joinNode.InputRefs()) {
var tableNode = joinNode.InputRefs()[1];
$.each(tableNode.selectedColumns(), function (j, column) {
if (column.checked()) {
includedIndexes.push(index);
}
index++;
});
}
})
var populateNodeSettings = function (curr, top, left) {
var settings = curr.GetSaveSettings();
if (curr.Tool.Name == "Select") {
settings.IncludedColumnIndexes = includedIndexes;
}
settings.Top = top;
settings.Left = left;
data.Nodes.unshift(settings);
if (curr.Tool.Name != "Data Table") {
// rebuild columns to account for joins that have been removed
if (curr.Tool.Name != "Join") {
settings.Columns = [];
settings.ColumnTypes = [];
}
$.each(curr.InputRefs().slice(0).reverse(), function (i, inputNode) {
// if this child is a join to a table with no columns selected we need to ignore it.
var next = inputNode;
var canIgnore = function (node) {
if (node.Tool.Name == "Join") {
return $.inArray(node.Id, joinIds) < 0;
} else {
return false;
}
};
while (canIgnore(next)) {
next = next.InputRefs()[0];
}
settings.Inputs[settings.Inputs.length - 1 - i] = next.Id;
var parentSettings;
if (curr.Tool.Name == "Join" && i == 0) {
parentSettings = populateNodeSettings(next, top + 45, left - 120);
} else {
parentSettings = populateNodeSettings(next, top - 45, left - 120);
}
// rebuild columns to account for joins that have been removed
if (curr.Tool.Name != "Join") {
settings.Columns = settings.Columns.concat(parentSettings.Columns);
settings.ColumnTypes = settings.ColumnTypes.concat(parentSettings.ColumnTypes);
}
});
}
else
{
settings.selectedColumns = curr.selectedColumns()
.filter(function (item) { return item.checked(); })
.map(function (item) { return item.name(); });
}
return settings;
}
if (self.selectedNode() != null) {
populateNodeSettings(self.selectedNode(), 0, 0);
var dataTableNode = data.Nodes.filter(function (node) { return node.Id == self.dataTable().Id; })[0];
var topOffset = 30 - dataTableNode.Top,
leftOffset = 30 - dataTableNode.Left;
$.each(data.Nodes, function(i, node) {
node.Top += topOffset;
node.Left += leftOffset;
});
if (self.HasChart()) {
data.Nodes.push({
"Type": self.GraphType(),
"Id": self.ChartGuid(),
"Inputs": [self.selectedNode().Id],
"HorizontalAxis": self.selectedNode().Columns()[self.XAxis()],
"DataSeriesColumnIndexes": [self.YAxis()],
"Name": "Line Chart 1",
"Top": 500,
"Left": 500,
"Columns": [],
"ColumnTypes": []
});
data.SelectedNodeId = self.ChartGuid();
} else {
data.SelectedNodeId = self.selectedNode().Id;
}
}
return data;
}
self.exportUrl = ko.pureComputed(function () {
if (self.serverQueryKey()) {
return backend.baseUri + "/api/cache/" + self.serverQueryKey() + "/" + self.selectedNode().Id + "/export/";
} else {
return null;
}
});
var refreshNode = function (start, node, rowCount, success, failure) {
var nodeSettings = [];
var joinIds = [];
$.each(self.joins(), function (i, joinNode) {
if (joinNode.InputRefs()) {
var tableNode = joinNode.InputRefs()[1];
if (tableNode.selectedColumnCount() > 0) {
if ($.inArray(joinNode.Id, joinIds) < 0) {
joinIds.push(joinNode.Id);
}
$.each(joinNode.children, function (j, nodeId) {
if ($.inArray(nodeId, joinIds) < 0) {
joinIds.push(nodeId);
}
})
}
}
})
var includedIndexes = [];
var index = 0;
$.each(self.dataTable().selectedColumns(), function (j, column) {
if (column.checked()) {
includedIndexes.push(index);
}
index++;
});
$.each(self.joins(), function (i, joinNode) {
if ($.inArray(joinNode.Id, joinIds) >= 0 && joinNode.InputRefs()) {
var tableNode = joinNode.InputRefs()[1];
$.each(tableNode.selectedColumns(), function (j, column) {
if (column.checked()) {
includedIndexes.push(index);
}
index++;
});
}
})
var populateNodeSettings = function (curr) {
var settings = curr.GetCoreSettings();
if (curr.Tool.Name == "Select") {
settings.IncludedColumnIndexes = includedIndexes;
}
nodeSettings.push(settings);
if (typeof curr.InputRefs === "function") {
$.each(curr.InputRefs().slice(0).reverse(), function (i, inputNode) {
// if this child is a join to a table with no columns selected we need to ignore it.
var next = inputNode;
var canIgnore = function (node) {
if (node.Tool.Name == "Join") {
return $.inArray(node.Id, joinIds) < 0;
} else {
return false;
}
};
while (canIgnore(next)) {
next = next.InputRefs()[0];
}
settings.Inputs[settings.Inputs.length - 1 - i] = next.Id;
populateNodeSettings(next);
});
}
}
populateNodeSettings(node);
backend.SaveQuery(self.serverQueryKey, nodeSettings, function () {
backend.LoadData(self.serverQueryKey, nodeSettings, node.Id, start, self.dataPageSize(), "JSON", null, function (data) {
if (data.status) {
node.SetColumns(data.columns, data.columnTypes);
if (data.status === "ok" || data.status === "no_data") {
if (rowCount) {
rowCount(data.rowCount);
}
if (node.Id == self.selectedNode().Id) {
self.currentDataColumns(data.columns);
self.currentData(data.rows);
self.currentRowStart(start + 1);
self.currentRowEnd(start + data.rows.length);
self.currentRowsTotal(data.rowCount);
var headerCategories = self.dataTables()
.filter(function (item) { return item.selectedColumnCount() > 0; })
.map(function (item) {
return {
name: item.Table(),
columnCount: item.selectedColumnCount()
};
});
if (!self.statistics() && headerCategories.length > 0) {
if (self.dataTable().selectedColumnCount() > 0) {
headerCategories.unshift({
name: self.dataTable().Table(),
columnCount: self.dataTable().selectedColumnCount()
});
}
self.headerCategories(headerCategories);
}
}
if (success) {
success();
}
} else {
if (rowCount) {
rowCount(null);
}
node.ErrorText("Something went wrong while trying to fetch the data. Please contact an administrator.");
if (failure) {
failure();
}
}
} else if (failure) {
failure();
}
});
});
};
self.loading = ko.observable(false);
self.headerCategories = ko.observableArray();
self.refresh = function (start, callback) {
if (self.filters().length == 0) {
self.filteredRowCount(null);
}
self.loading(true);
self.currentDataColumns([]);
self.currentData([]);
self.currentRowStart(0);