On Feb 24, 1:40 pm, John Denley <[email protected]> wrote:
> Thanks for this Thomas this has helped me narrow down my problem, but Im
> still not sure why Im getting the error heres my HTML code:
>
> <body>
> <iframe src="javascript:''" id="__gwt_historyFrame" tabIndex='-1'
> style="position:absolute;width:0;height:0;border:0"></iframe>
> TEST HARNESS<br>
> <table id="registration_page">
> <tbody>
> <tr>
> <td id="loadingcontainer">
> Loading the Application, Please wait.....<br>
> </td>
> </tr>
> <tr>
> <td id="logincontainer">
> </td>
> </tr>
> </tbody>
> </table>
> TEST HARNESS END
> </body>
>
> Heres my onmoduleLoad():
> {
> RootPanel.get("registration_page").setVisible(true);
> RootPanel.get("logincontainer").add(new HTML(""+"LOGIN SCREEN"));
>
> }
>
> If I comment out the first line it works fine, and if I leave it as above I
> get the error on the second line.
>
> From what you have said, Im guessing that the very act of using the
> "setVisible" is making GWT think that the "registration_page" is now a GWT
> widget
No, RootPanel.get(...) creates a RootPanel widget that wraps the
element, whether you call setVisible or not.
> and so it now wont let me add the new HTML to the "logincontainer"
> which is a child of "registration_page", presumably because there is a
> possibility that I could "setVisible(false)" and that would effectively
> "kill" the "logincontainer"?!
Possibly because you could do weird things with the
"registration_page" that would somehow put "logincontainer" in such a
state that GWT would correctly "clean up" after itself on page unload,
leading to memory leaks.
As I said on issue 3511 a while ago:
"""If all you want to do with "rightTopTable" is make it visible/
invisible, use
Document.get().getElementById("rightTopTable") and then
getStyle().setProperty("display", "none") or UIObject.setVisible(e,
false); you don't
need a Widget here."""
http://code.google.com/p/google-web-toolkit/issues/detail?id=3511
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