Wednesday, June 29, 2011

Making a button fire inside a custom AbstractCell


First off, the sample I'm describing here is just a trimmed down version of what I'm really going for.  What I'm really trying to do is put a FileUpload widget (gwtupload) inside a Cell so for each row within the table, the user can select one or more files and upload them.  I know one wouldn't typically do what I'm describing here because there are other Cell widgets available that cover it.  I've just trimmed it down to this to try and make sure I understand what I can/can't do in an AbstractCell.  When I saw this behavior as I was trying to use the file upload widget from gwtupload, I simplified it to try and get an idea as to where the issue might be.  The bottom line is it appears as though when creating an AbstractCell that contains a button, I am unable to get the button to fire it's click handler.  Here's some sample code that should demonstrate what I'm trying to do in this narrowed down case:

My AbstractCell:

private static class AbstractButtonCell extends AbstractCell<String> {


public void render( context,

final String value, SafeHtmlBuilder sb) {

if (value == null) {



VerticalPanel buttonPanel = new VerticalPanel();

Button addLinkButton = new Button("Click " + value);

addLinkButton.addClickHandler(new ClickHandler() {

public void onClick(ClickEvent event) {

Window.alert("You clicked " + value);







My column that's using the AbstractCell above:

AbstractButtonCell buttonCell = new AbstractButtonCell();

Column<SimilarApplication, String> buttonColumn = 

new Column<SimilarApplication, String> (buttonCell) {


public String getValue(SimilarApplication object) {

return object.getName();



 _cellTable.addColumn(buttonColumn, "A Button");

So, when the cell renders, it's got a button in it that says "Click <whatever comes from object.getName()".  However, when I click the button, it's onClick handler doesn't seem to fire.  I've looked through several other posts that discuss AbstractCells but I haven't been able to find one that describes quite what I'm seeing.

Any thoughts or suggestions would be greatly appreciated.  Thanks. 

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