you have to make sure that your ID is already there before calling getElementById. In other words make sure that your widget is attached to the document before calling this method.
On Mon, Jan 26, 2009 at 5:41 PM, SoMa <[email protected]> wrote: > > hi guys, > > I would like to get some help about getElementById() method. My > problem is that getElementById method return with null in my case. > > I have a "header" section in my index.htm file. When my web > application starts, at first I load header content in this frame. This > header contains two important labels for show full name of user and > company. > > Before login procedure content of these two label are empty (""). > After login procedure is success, I want to update content of fullname > and companyname fields but when I try to get references to fields (I > use getElementById method) I get null value. > > Here are my snippets of codes. > > I have an index.html with some frame: > <body> > <div id="myapp-frame-header"></div> > <div id="myapp-frame-menu"></div> > <div id="myapp-frame-main"></div> > <div id="myapp-frame-statusBar"></div> > ... > > And I made a HeaderPage.java composite class: > public class HeaderPage extends Composite > { > private HorizontalPanel mainPanel = new HorizontalPanel(); > private Label fullnameLabel = new Label(); > private Label companyLabel = new Label(); > ... > > public HeaderPage() > {...} > > public void render() > { > ... > fullnameLabel.getElement().setId("headerPage_fullnameLabel"); > ... > companyLabel.getElement().setId("headerPage_companyLabel"); > ... > mainPanel.add(fullnameLabel); > mainPanel.add(companyLabel); > > // all composites must call initWidget() in their constructors > initWidget(mainPanel); > } > > > content of MyAppEntryPoint.java: > public void onModuleLoad() > { > HeaderPage headerPage = new HeaderPage(); > headerPage.render(); > RootPanel.get("myapp-frame-header").add(headerPage); > ... > } > > After login procedure I use this code in another composite class > (example in LoginPage.java): > String id = "headerPage_fullnameLabel"; > Element element = DOM.getElementById(id); > //Element element = Document.get().getElementById(id); > > element.setInnerText(fullName); > > > but value of element is always null. I do not know what is wrong in my > code. > > Please help me. > > thx, Arnold > > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/Google-Web-Toolkit?hl=en -~----------~----~----~----~------~----~------~--~---
