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交替行样式

问题：如何用条件规则实现交替行样式效果

背景：

表格中默认存在交替行样式显示，需求在非表格（table）区域也希望实现此效果。

解决方案：

一行一行添加添加是一种解决方案，另外我们可以通过添加公式条件规则实现这个需求。

image

想要实现这种效果则需要两个公式。一个是ISODD，一个是ROW。ISODD用于判断数字是否是奇数，ROW用于返回引用的行号。具体代码如下：

var style = new GC.Spread.Sheets.Style();
style.backColor = "red";
var ranges = [new GC.Spread.Sheets.Range(0, 0, 10, 5)];
sheet.conditionalFormats.addFormulaRule("=ISODD(ROW(A1))", style, ranges);

下面是实现效果，供参考：

image


问题：如何在SpreadJS中实现过滤后始终显示交替行样式

背景：

在Gird或者Sheet表格中如果需要展示大量的行数据时，往往需要拖动垂直滚动条。

如果每条行数据本身又比较类似，每行的背景色相同，使用人员很容易找不到数据对应的具体是哪一行。

交替行样式在这个时候可以让表格变的更加易读，因此很多Gird或者Sheet类的表格控件大都支持交替行样式设置。

在SpreadJS中如何实现呢交替行效果呢？

解决方案：

Table 表格本身提供了交替行样式，通过设置 table.bandRows(true);即可给 Table 设置交替行样式，且在过滤后样式仍然可以保持。

有时候，我们需要在非表格区域也实现交替行样式，可以通过上面介绍的添加公式条件规则实现这个需求，也可以采用一行一行添加的方式去设置。

下面代码是在初始化事件中给非表格区域设置交替行样式：

let sheet = spread.getSheet(0);
for(var r = 0;r < sheet.getRowCount();r++){

    if(sheet.getRowVisible(r)) {
        i++;
        if(i % 2 == 0)
            sheet.getRange(r, -1, 1, -1).backColor('#EEEEF8');
        else
            sheet.getRange(r, -1, 1, -1).backColor('white');
    }
}

设置后的效果如下：

image

但是如果我们添加了行过滤器，在过滤后此前设置的交替行样式可能就没法保持了。

093721pe2ve9h21zyfeetb


此时，可以通过RangeFiltered事件，在每次筛选后重新设置样式，即可保持交替行样式。

参考代码如下：

sheet.bind(GC.Spread.Sheets.Events.RangeFiltered, function (e, info) {
  let i = 0;
  for (r = 0; r < sheet.getRowCount(); r++) {
    console.log(sheet.getRowVisible(r));
    if (sheet.getRowVisible(r)) {
      i++;
      if (i % 2 == 0) sheet.getRange(r, -1, 1, -1).backColor("lightseagreen");
      else sheet.getRange(r, -1, 1, -1).backColor("white");
    }
  }
});

设置后的效果：

093924nvn4knxvlv6skpkv

值得注意的是，交替行样式实质上是直接设置的单元格背景色，因此如果是载入了带单元格样式的workbook，再设置上述代码，会覆盖原有的单元格背景色。

作者: Grapecity.China | 审核：Clark.Pan | 更新时间：2023.09.26