Removing all Records from a ListGrid (Client Only)

[RobertS.]

Hi,

i'am using a ListGrid with client use only. Adding of Records works well but i don't get "removing of all records" implemented.

Here the definition of the ListGrid and DataSource

//ListGrid stuff
ListGrid listGridLayout = new ListGrid();
ListGridField fieldName = new ListGridField("name", "Name");
ListGridField fieldUrl = new ListGridField("url", "Url");
ListGridField fieldMultiContent = new ListGridField("multicontent", "Multi content");
ListGridField fieldMultiTitle = new ListGridField("multititle", "Multi title");

DataSource listGridLayoutDataSource = new DataSource();
DataSourceTextField nameDataSource = new DataSourceTextField("name");
DataSourceTextField urlDataSource = new DataSourceTextField("url");
DataSourceTextField multiContentDataSource = new DataSourceTextField("multicontent");
DataSourceTextField multiTitleDataSource = new DataSourceTextField("multititle");

listGridLayout.setShowAllRecords(true);
listGridLayout.setAutoFetchData(true);
listGridLayout.setFields(fieldName, fieldUrl, fieldMultiContent, fieldMultiTitle);

listGridLayoutDataSource.setClientOnly(true);
listGridLayoutDataSource.setID("LayoutGrid");
listGridLayoutDataSource.setFields(nameDataSource, urlDataSource, multiContentDataSource, multiTitleDataSource);
listGridLayout.setDataSource(listGridLayoutDataSource);

That is the method which adds records to ListGrid, this works well and with out problems...

    public void addRecordsToTreeGrid(ListGridRecord records[]) {
        for (int i = 0; i < records.length; i++) {
            listGridLayoutDataSource.addData(records[i]);
        }
    }

And that is the method which should remove all records from the ListGrid, that works completly not ;) and is my problem

    public void clearRecordList() {
        ListGridRecord[] tst = listGridLayout.getRecords();
        for(int i = 0; i < tst.length; i++) {
            listGridLayoutDataSource.removeData(tst[i]);
            listGridLayout.refreshRow(i);
        }
    }

Knows some one what is wrong? Or what i have to do diffrent to get it to work?
Thanks for help :)

[AndreiK]

I believe its because the grid is designed to be data-bound and data would ever rarely change so much that all data must be removed.

However this is something that does work:

grid.selectAllRecords();
grid.removeSelectedData();

It will be a little slower , since all records will need to be highlighted (you may be able to tweak this with disabling highlighting / css )

[RobertS.]

I believe its because the grid is designed to be data-bound and data would ever rarely change so much that all data must be removed.

However this is something that does work:

grid.selectAllRecords();
grid.removeSelectedData();

It will be a little slower , since all records will need to be highlighted (you may be able to tweak this with disabling highlighting / css )

At first thanks for repling. I tried it but it doesn't work

when i call

        listGridLayout.selectAllRecords();
        listGridLayout.removeSelectedData();

the rows will be selected but they are not removed... that's strange ^^

[AndreiK]

Maybe try a

grid.redraw(); right after?

I have this in my code and it works and I do have clientOnly as well

[RobertS.]

Maybe try a

grid.redraw(); right after?

I have this in my code and it works and I do have clientOnly as well

no, does not work as well :/

[AndreiK]

I also disable the grid prior to this so try

disable
selectall
removeselected
enable
redraw

[RobertS.]

I also disable the grid prior to this so try

disable
selectall
removeselected
enable
redraw

I tried it with

        listGridLayout.disable();
        listGridLayout.selectAllRecords();
        listGridLayout.removeSelectedData();
        listGridLayout.enable();
        listGridLayout.redraw();

but does not work to. Are maybe some of the attributes of the DataSource wrong?

[smartgwt.dev]

Try adding listGridLayout.removeSelectedData(); to a DeferredCommand, or get the RecordList from the ListGrid and call API's on it.

[RobertS.]

Try adding listGridLayout.removeSelectedData(); to a DeferredCommand, or get the RecordList from the ListGrid and call API's on it.

what do you mean with "DeferredCommand"?

[smartgwt.dev]

Look for it in the GWT javadocs.

[RobertS.]

Try adding listGridLayout.removeSelectedData(); to a DeferredCommand, or get the RecordList from the ListGrid and call API's on it.

Hi,

i tried it now on this way:

        try {
            listGridLayout.disable();
            listGridLayout.selectAllRecords();
            
            Command cmd = new Command() {

                public void execute() {
                    listGridLayout.removeSelectedData();
                    listGridLayout.enable();
                    listGridLayout.redraw();
                }
            };
            
            DeferredCommand.addCommand(cmd);

            //listGridLayout.fetchData();
            //listGridLayoutDataSource.fetchData();
        }
        catch(Exception e) {
            Window.alert(e.getMessage());
        }

... and it does not work...

...the second idea from you i tried at first (look at my first post) but does not work to

[RobertS.]

Now i tried it this way:

    public void clearRecordList() {
        try {
            Command cmd = new Command() {
                public void execute() {
                    ListGridRecord[] tst = listGridLayout.getRecords();
                    for(int i = 0; i < tst.length; i++) {
                        listGridLayoutDataSource.removeData(tst[i]);
                        listGridLayout.removeData(tst[i]);
                        listGridLayout.fetchData();
                    }
                }
            };
            DeferredCommand.addCommand(cmd);
        }
        catch(Exception e) {
            Window.alert(e.getMessage());
        }
    }

but does not work... it looks more and more like a realy horrible bug in smartGWT :/

[RobertS.]

I found a "work a round" for the problem!!!!!

And here is the "solution"!!!:

        try {
            DeferredCommand.addCommand(new Command() {

                public void execute() {
                    listGridLayoutDataSource.destroy();
                }
            });

            DeferredCommand.addCommand(new Command() {

                public void execute() {
                    listGridLayoutDataSource = new DataSource();
                    listGridLayoutDataSource.setClientOnly(true);
                    listGridLayoutDataSource.setID("LayoutGrid");
                    listGridLayoutDataSource.setFields(nameDataSource, urlDataSource, multiContentDataSource, multiTitleDataSource);
                    listGridLayout.setDataSource(listGridLayoutDataSource);
                }
            });
        } catch (Exception e) {
            Window.alert(e.getMessage());
        }

But anyway, it is in my opinion a smartGWT bug... and it sould be fixed... is somewhere a bugtrack for smartGWT? Than i could post it as ticket :)

[Isomorphic]

You're the only one experiencing this "bug" while others are reporting that it works.

Don't file a ticket. Try producing a standalone test case instead.

[RobertS.]

You're the only one experiencing this "bug" while others are reporting that it works.

Don't file a ticket. Try producing a standalone test case instead.

Little coment: to get the "work around" to work:

listGridLayout.setAutoFetchData(true);

need to be false:

listGridLayout.setAutoFetchData(false);

If that is false you have to call

        listGridLayout.fetchData();
        listGridLayoutDataSource.fetchData();

for adding rows.

I googled the problem and i found a lot post with the same problem and no one could fix it or get it to work. Every one with the same problem used a other work around for it. So in my opinion it is a bug.
The most people worked around with not using of DataSource to provide the grid with datas...