Merge cells after row insert #1377
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@curtcommander @Siemienik does this also cover a case where merged cells below rows which have been inserted also exhibit the same behaviour (value of merged cell gets applied to all cells)? As this is a bit of a blocker currently - using pre-existing excel files as a template and editing them using excelJS, but the data preservation goes out the window on merged cells when I do :( |
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@calumpeak Which version of exceljs are you using? The current latest version (4.2.0) preserves merges below rows that have been inserted, whereas 4.1.0 does not. I just tested this. |
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Summary
Merges aren't preserved when cells containing merges get overwritten after row inserts. Instead, the value of a merged cell gets applied to all cells in the merge separately.
becomes
This is because the values for the previously merged cells are pulled from the source row (
rSrc.valuesinspliceRows). The source row's values repeat the merged value for each cell in the merge. For example, the source row values for the row in the first table would be["merged cell text", "merged cell text"]. These values are what gets applied to the cells in the destination row (rDst), and the merge is lost.The extra lines I wrote in
spliceRowsto fix this reapply merges to cells while accounting for the offset caused by a row insert.Test plan
I added a test to spec/unit/doc/worksheet.merge.spec for this issue and verified that it passes with the changes I made.