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       
(Showing Draft Content)

General Slicer

You can create a general slicer with the GeneralSlicerData class. A general slicer is used to process data for a two-dimensional array and provides properties and methods that you can use to filter the data and get the filtered result. You can attach multiple slicers to a general slicer. Each slicer can filter one column of data. After the filter is complete, the other slicers are notified by the GeneralSlicerData class. The slicers then can get the filtered result from GeneralSlicerData and update their UI.

Note: To work with general slicers in a SpreadJS worksheet, you need to reference the gc.spread.sheets.all.js plugin.

The slicer works with the GeneralSlicerData class based on the following steps:

  1. Create a new GeneralSlicerData with your data.

  2. Create a new custom slicer and attach it to GeneralSlicerData.

  3. Get the column data from GeneralSlicerData and build the slicer UI.

  4. Respond to the UI events and invoke the GeneralSlicerData doFilter method.

  5. Get the filtered result from GeneralSlicerData and update the slicer UI.

The GeneralSlicerData class provides the following methods to help control general slicers.

  • Get all the data for a specific column with the getData method.

  • Get exclusive (non-repeating data) with the getExclusiveData method.

  • Filter a column with the doFilter method.

  • Clear the filter information with the doUnfilter method.

For a complete list of methods, see the GeneralSlicerData class.

You can attach a listener to GeneralSlicerData with the attachListener function and detach it with the detachListener function.

The following image displays a custom slicer.


The following code sample creates a general slicer.

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <script src="https://code.jquery.com/jquery-2.1.1.min.js" type="text/javascript"></script>
    <!--CSS files-->
    <link href="scripts/gc.spread.sheets.excel2013white.x.x.x.css" rel="stylesheet" />
    <!--Script files-->
    <script type="text/javascript" src="scripts/gc.spread.sheets.all.x.x.x.min.js"></script>
    <script type="text/javascript">
        //Define data source.
        columnNames = ["Name", "City", "Birthday"];
        data = [
            ["Bob", "NewYork", "1968/6/8"],
            ["Betty", "Washington", "1972/7/3"],
            ["Alice", "NewYork", "1964/3/2"]];
        //Define custom slicer.
        function MySlicer(container) {
            this.container = container;
            this.slicerData = null;
            this.columnName = null;
        }
        MySlicer.prototype.setData = function (slicerData, columnName) {
            this.slicerData = slicerData;
            this.columnName = columnName;
            this.slicerData.attachListener(this);
            this.onDataLoaded();
        }
        MySlicer.prototype.onDataLoaded = function () {
            //create slicer dom tree.
            var columnName = this.columnName,
                exclusiveData = this.slicerData.getExclusiveData(columnName);
            $(this.container).append($('<span>' + this.columnName + ':</span>' + '<br />'));
            var domString = "";
            for (var i = 0; i < exclusiveData.length; i++) {
                domString += '<input type="checkbox" name="' + columnName + '" value="' + exclusiveData[i] + '">';
                domString += '<span>' + exclusiveData[i] + '</span>';
                domString += '<br />';
            }
            $(this.container).append($(domString));
            //attach events to dom.
            var self = this;
            $("[name='" + self.columnName + "']").change(function () {
                var slicer = self,
                    exclusiveData = slicer.slicerData.getExclusiveData(slicer.columnName),
                    parent = $(this).parent(),
                    items = parent.children(),
                    indexes = [];
                for (var i = 0, length = items.length; i < length; i++) {
                    if (items[i].checked) {
                        var value = items[i].value;
                        if (!isNaN(parseInt(value))) {
                            value = parseInt(value);
                        }
                        indexes.push(exclusiveData.indexOf(value))
                    }
                }
                if (indexes.length === 0) {
                    slicer.slicerData.doUnfilter(slicer.columnName);
                } else {
                    slicer.slicerData.doFilter(slicer.columnName, { exclusiveRowIndexes: indexes });
                }
            });
        };
        MySlicer.prototype.onFiltered = function () {
            //The following is an example of showing the filtered result.
            var slicerdata = this.slicerData;
            var filteredRowIndexs = slicerdata.getFilteredRowIndexes();
            var trs = $listTable.find("tr");
            for (var i = 0; i < slicerdata.data.length; i++) {
                if (filteredRowIndexs.indexOf(i) !== -1) {
                    $(trs[i + 1]).show();
                } else {
                    $(trs[i + 1]).hide();
                }
            }
        }
        //Define the show filtered result method.
        function initFilteredResultList() {
            var tableStr = "<table border='1' cellpadding='0' cellspacing='0'><tr>";
            for (var i = 0; i < columnNames.length; i++) {
                tableStr += "<th>" + columnNames[i] + "</th>";
            }
            tableStr += "</tr>";
            for (var i = 0; i < data.length; i++) {
                tableStr += "<tr>";
                for (var j = 0; j < data[i].length; j++) {
                    tableStr += "<td>" + data[i][j] + "</td>";
                }
                tableStr += "</tr>";
            }
            tableStr += "</table>";
            $listTable = $(tableStr);
            $("#list").append($listTable);
        }
        $(document).ready(function () {
            //init filtered result list.
            initFilteredResultList();
            //create a custom slicer and add this slicer to the "slicerContainer" div.
            var slicer = new MySlicer($("#slicerContainer")[0]);
            var slicerData = new GC.Spread.Slicers.GeneralSlicerData(data, columnNames);
            slicer.setData(slicerData, "Name");
        });
    </script>
</head>
<body>
    <div id="slicerContainer" style="border:1px solid gray;width:190px"></div>
    <hr />
    <div id="list" style="width:300px;float:left"></div>
</body>
</html>

Note: To upgrade to the new slicers, see Breaking Changes.