Vaadin grid, additional header renders other headers invisible

Question

Situation: Assume you have a simple grid, with only 2 columns. First column is frozen. You're trying to join the 2nd column with additional header.

Problem: after joining the column, the column captions (in the header cells) of all columns disappear.

Code to reproduce:

Grid table = new Grid();
HeaderRow header = table.addHeaderRowAt(0);

Column c1 = table.addColumn("C1", String.class);
table.setFrozenColumnCount(1);
Column d1 = table.addColumn("D1", Short.class);

c1.setHeaderCaption("Frozen col");
d1.setHeaderCaption("1/10");

header.join("D1");
table.addRow("Example name", (short)25);

Without join:

With join:

Am I doing something wrong or this is a Vaadin bug?

Vaadin version: 7.7.0

Regards

Answer 1

您需要加入两个列：

header.join("C1", "D1");

来自.join(Object... propertyIds)功能：

assert propertyIds.length > 1 : "You need to merge at least 2 properties";

Answer 2

我遇到了同样的问题（Vaadin 8.5.0）。如果只有一列，则无需调用header.join(...)。而是通过调用HeaderCell headerCell = headerRow.getCell("D1")获取标头单元。您仍然可以设置headerCell的组成部分或文本。