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数据扩展时复制公式

问题：如何在表格绑定时复制公式

背景

目前 SpreadJS 在数据绑定中，暂时不支持公式绑定。以下表为例：

这种表，其实是一个典型的表格绑定，但比较麻烦的是，总工时这一列等于工时分解下区域的总和。总工时这里不是一个单纯的值，而是一个公式。本文针对这种情况提供一种解决方案。

实现思路

1. 设计模板结构：

表中2，3，4行其实是一个多行表头，这里建议直接用设计就可以了，不要用表格。

从第五行开始，其实是一个表格绑定，但是这里将表头隐藏起来了。表格绑定中总工时这一列绑定字段要设置为空，然后写上sum函数。

具体的空模板参考demo中的bindfile.js。

2. 绑定数据：

let sheet = spread.getActiveSheet()
let source = new GC.Spread.Sheets.Bindings.CellBindingSource(datas)
sheet.setDataSource(source)
let table = sheet.tables.findByName('details')
copyTableFormula(sheet,table)

3. 完成复制表格区域公式的函数：

function copyTableFormula(sheet, table) {
  var range = table.dataRange();
  for (var i = 0; i < range.rowCount - 1; i++) {
    //总工时这一列可以打个tag做一下标记
    sheet.copyTo(
      range.row + i,
      5,
      range.row + i + 1,
      5,
      1,
      1,
      GC.Spread.Sheets.CopyToOptions.formula
    );
  }
}

4. 监听表格行变化事件，行变化时复制公式。

sheet.bind(GC.Spread.Sheets.Events.TableRowsChanged,function(e,data){
    copyTableFormula(data.sheet,data.table)
})

完整版Demo可以参考附件：

吉利-数据绑定_2023-08-22.zip

作者: GrapeCity China | 审核：AlexZ | 更新时间：2023.09.24