自定义筛选器

Spread.Sheets 提供了筛选前和筛选后的接口，你可以自定义筛选器在筛选前和筛选后的行为。

如果要自定义筛选器的行为，你需要做如下事情：

从 RowFilterBase 派生一个类
重写 onFilter 方法，并处理筛选时候的事件。

如果要自定义取消筛选时的行为，你需要做以下事情：

从 RowFilterBase 派生一个类
重写 onFilter 方法，并处理 unfilter 事件。

你可以使用筛选器来改变筛选后行的颜色，如下图：

示例代码

以下代码扩展了 RowFilterBase 类，并且将 onFilter 方法重写了：

JavaScript

$(function () {
            var spread = new GC.Spread.Sheets.Workbook($("#ss")[0]);
            var activeSheet = spread.getActiveSheet();
            spread.suspendPaint();
            activeSheet.setColumnWidth(0, 100);
            activeSheet.setColumnWidth(1, 200);
            activeSheet.addSpan(0, 0, 1, 2);
            activeSheet.getCell(0, 0).value("Students' Math Scores").hAlign(GC.Spread.Sheets.HorizontalAlign.center);
            activeSheet.setValue(1, 0, "Name");
            activeSheet.setValue(1, 1, "SCORE");
            var score = [
                {name: "Simon", score: 59},
                {name: "Jack", score: 70},
                {name: "Lily", score: 86},
                {name: "Bob", score: 54},
                {name: "Lucy", score: 84},
                {name: "John", score: 99}
            ];
            for (var i = 0, len = score.length; i < len; i++) {
                var student = score[i];
                activeSheet.setValue(i + 2, 0, student.name);
                activeSheet.setValue(i + 2, 1, student.score);
            }
            var b1 = new GC.Spread.Sheets.CellTypes.Button();
            b1.text("Filter Score < 60");
            activeSheet.setCellType(8, 1, b1);
            var b2 = new GC.Spread.Sheets.CellTypes.Button();
            b2.text("Unfilter this column");
            activeSheet.setCellType(9, 1, b2);

            function HighLightFilter(range) {
                GC.Spread.Sheets.Filter.RowFilterBase.call(this, range);
            }
            HighLightFilter.prototype = new GC.Spread.Sheets.Filter.RowFilterBase();
            HighLightFilter.prototype.onFilter = function (args) {
                if (!args) {
                    return;
                }
                var sheet = args.sheet, range = args.range, filterRows = args.filteredRows, filterActionType = args.action;
                if (filterActionType === GC.Spread.Sheets.Filter.FilterActionType.Filter) {
                    if (range.col < 0) {
                        range.col = 0;
                        range.colCount = sheet.getColumnCount();
                    }
                    for (var i = 0, len = filterRows.length; i < len; i++) {
                        var r = filterRows[i];
                        for (var c = range.col, len1 = range.col + range.colCount; c < len1; c++) {
                            sheet.getCell(r, c).backColor("red");
                        }
                    }
                    sheet.setValue(9, 1, "Highlight the score less than 60");
                } else if (filterActionType === GC.Spread.Sheets.Filter.FilterActionType.Unfilter) {
                    if (range.col < 0) {
                        range.col = 0;
                        range.colCount = sheet.getColumnCount();
                    }
                    for (var i = 0, len = filterRows.length; i < len; i++) {
                        var r = filterRows[i];
                        for (var c = range.col, len1 = range.col + range.colCount; c < len1; c++) {
                            sheet.getCell(r, c).backColor(undefined);
                        }
                    }
                }
            }
            var hlf = new HighLightFilter(new GC.Spread.Sheets.Range(2, 1, 6, 1));
            activeSheet.rowFilter(hlf);
            var condition = new GC.Spread.Sheets.ConditionalFormatting.Condition(GC.Spread.Sheets.ConditionalFormatting.ConditionType.NumberCondition,
                    {
                        compareType: GC.Spread.Sheets.ConditionalFormatting.GeneralComparisonOperators.LessThan,
                        expected: 60
                    });
            hlf.addFilterItem(1, condition);
            hlf.filterButtonVisible(false);
            spread.bind(GC.Spread.Sheets.Events.ButtonClicked, function (e, args) {
                if (args.row === 8) {
                    if (args.col !== undefined) {
                        hlf.filter(args.col);
                    }
                } else if (args.row === 9) {
                    if (args.col !== undefined) {
                        hlf.unfilter(args.col);
                    }
                }
            });
            spread.resumePaint();  
        });

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自定义筛选器