dotJ Software

Sorting is one critical item when it comes to using grids to display your data. By default, our library can sort the rows of a grid using a generic algorithm. This suffices for most basic needs. However, sometimes you may wish to perform the row sorting on your own and just have the grid render accordingly.

This is now possible in version 2.0 by way of the IGridCommandEventArgs and IGridListener interfaces. In this example, we let the database do the row sorting using the standard ORDER BY SQL clause. The sort parameters are posted to the server and can be extracted out via the IGridCommandEventArgs interface. The sort parameters can then be translated into SQL. The last part is to inform the grid that the rows are already sorted. This can be done using the doCustomSort callback method.

public boolean doCustomSort(ISortContext sortContext) {
	// Tell the grid we are sorting upon the first display of the grid.
	if (isPost == false) {
           sortContext.setSortColumnNumber(sortColumn);
           sortContext.setSortType(sortType);
	}

	return true;
}

By returning true, you are telling the grid not to sort the rows. In the above example, the two setter calls are necessary since we are showing the grid as sorted when it first displays (isPost == false).

Messages

Id	Last Name	First Name	Gender	Zip
6	AAAAAAAAAA		Female	04101
9	Parding		Male	04105
3	arpei	bag11	Male	22151
13	Fellows	Bill	Male	04qwqw
14	Warren1	danesh	Male	42844
12	Test	Data	Male	78723
1	ppp	gh	n	6083
8	vjvjv	hjvhjv	Male	fghff
7	Hogan	jeff	Male	04105
4	Gardner	matt	Male	90210
5	º3º	matt	Female	1234
11	Grant1	paul123	Male	04106
16	Jeyaðððð	Prabhuððð	Male
10	Danns	Sam	Male	04105
2	das	sonia	Female	3456
15	Prabhufdsfsd	Test2	Male	321

The above grid contains 16 records.

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CustomSortAction.java

MyGridListenerCustomSort.java

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