问题
Expected output is the same as in the preview, with labels that indicate the specified blocks.
I run this in standard mode and I am using GWT 2.1.1
Below is the expected output:
Actual output:
<html><head>
<!-- The DOCTYPE declaration above will set the -->
<!-- browser's rendering engine into -->
<!-- "Standards Mode". Replacing this declaration -->
<!-- with a "Quirks Mode" doctype may lead to some -->
<!-- differences in layout. -->
<meta content="text/html; charset=UTF-8" http-equiv="content-type">
<!-- -->
<!-- Consider inlining CSS to reduce the number of requested files -->
<!-- -->
<link href="DucWMP.css" rel="stylesheet" type="text/css">
<!-- -->
<!-- Any title is fine -->
<!-- -->
<title>Web Application Starter Project</title>
<!-- -->
<!-- This script loads your compiled module. -->
<!-- If you add any GWT meta tags, they must -->
<!-- be added before this line. -->
<!-- -->
<script src="ducwmp/ducwmp.nocache.js" language="javascript" type="text/javascript"></script><script defer="defer">ducwmp.onInjectionDone('ducwmp')</script>
<!-- -->
<!-- The body can have arbitrary html, or -->
<!-- you can leave the body empty if you want -->
<!-- to create a completely dynamic UI. -->
<!-- -->
<link rel="stylesheet" href="http://127.0.0.1:8888/ducwmp/gwt/standard/standard.css"><style>.GC3DVSKBA{background-color:ivory;}</style></head><body>
<!-- OPTIONAL: include this if you want history support -->
<iframe style="position: absolute; width: 0pt; height: 0pt; border: 0pt none;" tabindex="-1" id="__gwt_historyFrame" src="javascript:''"></iframe>
<!-- RECOMMENDED if your web app will not function without JavaScript enabled -->
<noscript>
<div style="width: 22em; position: absolute; left: 50%; margin-left: -11em; color: red; background-color: white; border: 1px solid red; padding: 4px; font-family: sans-serif">
Your web browser must have JavaScript enabled
in order for this application to display correctly.
</div>
</noscript>
<iframe src="javascript:''" id="ducwmp" style="position: absolute; width: 0pt; height: 0pt; border: medium none;" tabindex="-1"></iframe><div style="position: absolute; z-index: -32767; top: -20cm; width: 10cm; height: 10cm;"> </div><div style="position: relative;" class="GC3DVSKBA"><div style="position: absolute; z-index: -32767; top: -20ex; width: 10em; height: 10ex;"> </div><div style="position: absolute; overflow: hidden; left: 0em; top: 0em; right: 0em; height: 4em;"><div class="gwt-Label" style="position: absolute; left: 0px; top: 0px; right: 0px; bottom: 0px;">Header + Navigation</div></div><div style="position: absolute; overflow: hidden; left: 0em; right: 0em; bottom: 0em; height: 2em;"><table cellspacing="0" cellpadding="0" style="position: absolute; left: 0px; top: 0px; right: 0px; bottom: 0px;"><tbody><tr><td align="left" style="vertical-align: top;"><div class="gwt-Label">Group control</div></td></tr></tbody></table></div><div style="position: absolute; overflow: hidden; left: 0em; top: 4em; right: 0em; bottom: 2em;"><div style="position: absolute; left: 0px; top: 0px; right: 0px; bottom: 0px;" class="gwt-SplitLayoutPanel"><div style="position: absolute; z-index: -32767; top: -20ex; width: 10em; height: 10ex;"> </div><div style="position: absolute; overflow: hidden; top: 0px; right: 0px; bottom: 0px; width: 128px;"><div class="gwt-Label" style="position: absolute; left: 0px; top: 0px; right: 0px; bottom: 0px;">Right Sidebar</div></div><div style="position: absolute; overflow: hidden; top: 0px; right: 128px; bottom: 0px; width: 8px;"><div style="width: 8px; position: absolute; left: 0px; top: 0px; right: 0px; bottom: 0px;" class="gwt-SplitLayoutPanel-HDragger"></div></div><div style="position: absolute; overflow: hidden; left: 0px; top: 0px; right: 136px; bottom: 0px;"><div style="overflow: auto; position: absolute; left: 0px; top: 0px; right: 0px; bottom: 0px;"><div style="position: relative;"><div class="gwt-Label">Component Box</div></div></div></div></div></div></div></body></html>
回答1:
In Java code make sure you do
RootLayoutPanel.get().add(appWidget);
Instead of
RootPanel.get().add(appWidget);
来源：https://stackoverflow.com/questions/4841957/gwt-docklayout-panel-not-showing