GWT creates a hidden iframe with an id equal to whatever your module is
renamed to. In your case, you had a div with id="Hangman", and GWT inserted
an iframe with *the exact same id*. This caused the problem you were facing.
Renaming the div got rid of the duplicate id, and that's why the application
works.
Its frustrating, I know.
--Sri
On 24 May 2010 20:42, rudolf michael <roud...@gmail.com> wrote:
> The Id of the DIV always matter whenever you are doing
> RootPanel.get(myDivId) and it is case sensitive also.
> this is applicable since GWT beta releases/
>
> best regards,
> Rudolf Michael
>
>
> On Sat, May 22, 2010 at 2:51 PM, googling1000 <googling1...@gmail.com>wrote:
>
>> Hi,
>>
>> This is my first attempt at GWT. Hope it will be a joyful experience.
>>
>> I'm trying out a hangman example from this one book called Google Web
>> Toolkit Applications.
>> And, I spent the last two days trying to figure out why I couldn't see
>> anything on the screen, rather than the word "Hangman"
>>
>> Finally, I noticed that the problem was caused by the name of a <div>
>> inside hangman.html
>>
>>
>> Right now, I'm displaying two buttons and a label.
>>
>> /**********************************************
>> This is what I have under hangman.java:
>> **********************************************/
>> public class HangMan implements EntryPoint {
>> public void onModuleLoad(){
>> final Button button = new Button("Click me");
>> final Label label = new Label();
>>
>> //to display a button with a letter "A"
>> final char letter = 'A';
>> final Button alphabutton = new
>> Button(Character.toString(letter));
>> RootPanel.get("mydiv").add(alphabutton); //Please notice
>> that I
>> named the div "mydiv" and the program works. Had I named the div
>> "hangman", I would not have seen anything on the screen, except the
>> word "Hangman"
>>
>> button.addClickHandler(new ClickHandler() {
>> @Override
>> public void onClick(ClickEvent event) {
>> if (label.getText().equals(""))
>> label.setText("Hello World!");
>> else
>> label.setText("");
>> }
>> });
>> //to display a button with the word "Click me"
>> RootPanel.get("slot1").add(button);
>> //to display a label
>> RootPanel.get("slot2").add(label);
>> }
>> }
>>
>>
>> /**********************************************
>> This is what I have under hangman.html:
>> **********************************************/
>> <!doctype html>
>> <html>
>> <head>
>> <meta http-equiv="content-type" content="text/html;
>> charset=UTF-8">
>> <link type="text/css" rel="stylesheet" href="HangMan.css">
>>
>> <title>Hangman</title>
>> <style>
>> body,td,a,div, .p{font-family:arial, sans-serif}
>> div,td{color:#000000}
>> a:link,.w,.w a:linnk{color:#0000cc}
>> a:visited{color: #551a8b}
>> a:active{color: #ff0000}
>> </style>
>> <script type="text/javascript" language="javascript" src="hangman/
>> hangman.nocache.js"></script>
>> </head>
>>
>> <body>
>> <iframe src="javascript:''" id="__gwt_historyFrame" tabIndex='-1'
>> style="position:absolute;width:0;height:0;border:0"></iframe>
>> <h1>Hangman</h1>
>> <div id="mydiv"></div> <!-- NOTE: when I named this div
>> "hangman", nothing appeared on the screen -->
>>
>> <table align="center">
>> <tr>
>> <td id="slot1"></td><td id="slot2"></td>
>> </tr>
>> </table>
>> </body>
>> </html>
>>
>> I would really like someone to help shed some light no this.
>> What is the explanation behind this?
>> And, the Google Web Toolkit Applications book named the <div>
>> "hangman" and I believe that means it must have worked fine for the
>> author. Does this mean that maybe the name of the <div> didn't matter
>> in the earlier versions of GWT?
>>
>> Thank you in advance for any input!
>> Fran
>>
>> --
>> You received this message because you are subscribed to the Google Groups
>> "Google Web Toolkit" group.
>> To post to this group, send email to google-web-tool...@googlegroups.com.
>> To unsubscribe from this group, send email to
>> google-web-toolkit+unsubscr...@googlegroups.com<google-web-toolkit%2bunsubscr...@googlegroups.com>
>> .
>> For more options, visit this group at
>> http://groups.google.com/group/google-web-toolkit?hl=en.
>>
>>
> --
> You received this message because you are subscribed to the Google Groups
> "Google Web Toolkit" group.
> To post to this group, send email to google-web-tool...@googlegroups.com.
> To unsubscribe from this group, send email to
> google-web-toolkit+unsubscr...@googlegroups.com<google-web-toolkit%2bunsubscr...@googlegroups.com>
> .
> For more options, visit this group at
> http://groups.google.com/group/google-web-toolkit?hl=en.
>
--
You received this message because you are subscribed to the Google Groups
"Google Web Toolkit" group.
To post to this group, send email to google-web-tool...@googlegroups.com.
To unsubscribe from this group, send email to
google-web-toolkit+unsubscr...@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/google-web-toolkit?hl=en.
