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展开/折叠按钮

在报告表中的显示/折叠按钮允许您展开或折叠特定单元格。请注意，报告表仅允许在预览渲染模式下进行单元格显示/折叠操作。

通过将IReportTemplateCell接口的showCollapseButton属性设置为true，您可以在报表模板中添加显示/折叠按钮。

这个showCollapseButton属性控制是否显示可以折叠报告中单元格子项的按钮。

// Configure the Show/Collapse button in the TemplateSheet. 
const columns = ['shipCountry', 'shipCity'];
templateSheet.setTemplateCell(0, 0, {
     type: 'Group',
     binding: 'Orders[shipCountry]',
     showCollapseButton: true,
});
templateSheet.setTemplateCell(0, 1, {
      type: 'List',
      binding: 'Orders[shipCity]',
});
reportSheet.refresh();

下图显示了在运输国家选项中添加了显示/折叠按钮。

注意：此外，SpreadJS 在 ReportSheet 类中还有另外两个方法，getCollapseState 和 toggleCollapseState，用来确定单元格当前是折叠还是展开的，以及切换指定单元格的折叠状态。