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Editorial Team
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Asked: 2026-05-29T22:47:39+00:00

I use GWT to build a mobile webapp. When I call the app on

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I use GWT to build a mobile webapp.

When I call the app on a mobile browser with a mobile internet connection, the loading of the javascript, generated by GWT, takes a long time.

So, I want to change it that way, that I first send a Start HTML-page to the client and load the GWT-javascript at background.

Is this possible?

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1 Answer

  1. Editorial Team

    I don’t really know about mobile apps but in a GWT app, the javascript is loaded into a html page inside a script tag:

    <!--                                           -->
<!-- This script loads your compiled module.   -->
<!-- If you add any GWT meta tags, they must   -->
<!-- be added before this line.                -->
<!--                                           -->
<script type="text/javascript" language="javascript" src="application/application.nocache.js"></script>

    If you want anything to appear before the loading of the javascript is done, just put it on that page as html.
    example: 

    <!--                                           -->
<!-- The body can have arbitrary html, or      -->
<!-- you can leave the body empty if you want  -->
<!-- to create a completely dynamic UI.        -->
<!--                                           -->
<body>

<!-- OPTIONAL: include this if you want history support -->
<iframe src="javascript:''" id="__gwt_historyFrame" tabIndex='-1' style="position:absolute;width:0;height:0;border:0"></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>

<!-- Loading indicator -->
<div id="loading">
  <div class="loading-indicator">
  <img src="images/loadingStar.gif" width="40" height="40" />Application Name<br />
<span id="loading-msg">Loading...</span></div>
</div>

<!--                                           -->
<!-- This script loads your compiled module.   -->
<!-- If you add any GWT meta tags, they must   -->
<!-- be added before this line.                -->
<!--                                           -->
<script type="text/javascript" language="javascript" src="application/application.nocache.js"></script>

    Here, a div tag puts a loading gif on the page that appears until all the gwt javascript has been loaded. You can put anything you want on that page before loading the javascript.

    Then in your application, (on module load) replace the content of the rootpanel with your application !!

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