Re: How to avoid freezing with CellTable?

2-3 minutes ? There must be something seriously wrong because there is no way it should take so long to populate a CellTable. 

1.) Profile your web-app. What does take so long (serialization or rendering)? use Chrome Dev Tools to do that. 

2.) Use paging. From a UX point of view it doesn't make sense to show all rows at once. 

3.) Transfer chunks of data (using AsyncDataProvider) because as of point 2 the user doesn't need to see all rows at once. 

On Monday, July 1, 2013 7:58:02 PM UTC+2, sebastie...@isen-lille.fr wrote:

Hi everybody,

I'm creating a website with GWT. I want to add CellTable into my project. The problem is that I have a lot of data to put into the tables. So, my website freeze and show my table after 2-3 minutes. 

I find on internet that multi-threads are impossible with GWT. So, what is the solution? Even if the user have to wait 2-3 minutes, I want to avoid the fact that it's freezing.

Any Ideas?

Thank you.

My code, maybe I can optimize it simply?

public void refreshTable(final ArrayList<String> arrListFilters, final ArrayList<String> arrListAll, String url) {

// Get the CQ result

RequestBuilder builder = new RequestBuilder(RequestBuilder.GET, url);

try {

Request response = builder.sendRequest(null, new RequestCallback() {

public void onError(Request request, Throwable exception) {

}

public void onResponseReceived(Request request, Response response) {

final json json = JsonUtils.unsafeEval(response.getText());

int i = 0;

int j = 0;

int tot;

// If there are too many results

if (json.getResultslength() > 10000) {

tot = 10000;

} else {

tot = json.getResultslength();

}

// Fill the list of rows

while (j < tot) {

i = 1;

List<String> rowTemp = new ArrayList<String>();

rowTemp.add(json.getDate(j));

// Get the data to get a price result for a specific

// customer query

arrListLnNb.add(json.getLineNb(j));

arrListId.add(json.getId(j));

arrListCqid.add(json.getCqid(j));

while (i < arrListFilters.size()) {

rowTemp.add(json.getResults(j, arrListAll.indexOf(arrListFilters.get(i))));

i = i + 1;

}

rowTemp.add("");

rows.add(rowTemp);

j = j + 1;

}

// Provide rows to the table

table.setRowCount(rows.size(), true);

table.setRowData(0, rows);

final ListDataProvider<List<String>> provider = new ListDataProvider<List<String>>(rows);

provider.addDataDisplay(table);

// Handler to sort the columns

List<List<String>> list1 = provider.getList();

ListHandler<List<String>> columnSortHandler = new ListHandler<List<String>>(list1);

i = 0;

while (i < table.getColumnCount()) {

final int columnIndex = i;

columnSortHandler.setComparator(table.getColumn(i), new Comparator<List<String>>() {

public int compare(List<String> o1, List<String> o2) {

if (o1 == o2) {

return 0;

}

// Compare the name columns.

if (o1 != null) {

return (o2 != null) ? o1.get(columnIndex).compareTo(o2.get(columnIndex)) : 1;

}

return -1;

}

});

i = i + 1;

}

table.addColumnSortHandler(columnSortHandler);

i = 0;

while (i < table.getColumnCount()) {

table.getColumnSortList().push(table.getColumn(i));

i = i + 1;

}

}

});

} catch (RequestException e) {

}

}

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