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SpreadJS supports text decoration. You can specify a line below, above, or through the text using the textDecoration method.
The following code sample adds a line above the text in cell (0,0), a line below and above the text in cell (1,0), and a line above, below, and through the text in cell (0,1).
activeSheet.getCell(0, 0, GC.Spread.Sheets.SheetArea.viewport).textDecoration(GC.Spread.Sheets.TextDecorationType.Underline);
activeSheet.getRange(1, -1, 1, -1, GC.Spread.Sheets.SheetArea.viewport).textDecoration(GC.Spread.Sheets.TextDecorationType.Overline | GC.Spread.Sheets.TextDecorationType.Underline);
activeSheet.getRange(-1, 1, -1, 1, GC.Spread.Sheets.SheetArea.viewport).textDecoration(GC.Spread.Sheets.TextDecorationType.Overline | GC.Spread.Sheets.TextDecorationType.LineThrough | GC.Spread.Sheets.TextDecorationType.Underline);
var style = new GC.Spread.Sheets.Style();
style.textDecoration = GC.Spread.Sheets.TextDecorationType.Overline | GC.Spread.Sheets.TextDecorationType.Underline;
activeSheet.setStyle(1, 1, style, GC.Spread.Sheets.SheetArea.viewport);
activeSheet.getCell(0, 0, GC.Spread.Sheets.SheetArea.viewport).value("Test");
activeSheet.getCell(1, 0, GC.Spread.Sheets.SheetArea.viewport).value("Test");
activeSheet.getCell(0, 1, GC.Spread.Sheets.SheetArea.viewport).value("Test");
While setting text-decoration, you can also use the double underline feature to display text as shown in the below image:
The following example code shows how to use the double underline feature while setting text-decoration.
var style = new GC.Spread.Sheets.Style();
style.textDecoration = GC.Spread.Sheets.TextDecorationType.doubleUnderline;
sheet.setStyle(2,1,style);