Learn About the Ext GWT Library

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1 FAQ

FAQ

Where can I find any documentation?

Javadocs API can be found on-line here -> http://extjs.com/deploy/gxtdocs/

A beginers guide to Ext GWT can be found here -> http://extjs.com/helpcenter/index.jsp

How to refresh a tree?

Use TreeStore.add(M parent, M item, boolean addChildren), TreeLoader.loadChildren(parent) or TreeLoader.load()

Why cannot I only add Fields to a FormPanel?

FormPanel has a FormLayout which only renders Fields. If you want to use other widgets, use AdapterField

How to handle selection events on a Tree?

Use TreeBinder.addSelectionChangedListener(..)

How to build a simple Tree with strings?

Just manually add the items, using TreeItem.add(TreeItem), starting with tree.getRootItem().

I have different behaviours in Internet Explorer and Firefox, is it a Ext GWT bug?

First, check that you have the good doctype declaration in your HTML main file : <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Final//EN">

Second, make sure no other stylesheets are loaded that might conflict with Ext GWT - ie only have css/ext-all.css

How do I explicitly listen for mouse clicks on a widget?

     widget.el().addEventsSunk(Event.ONCLICK);
     widget.addListener(Events.OnClick, new Listener<DomEvent>() {
       public void handleEvent(DomEvent be) {
         System.out.println("Clicked!");
       }
     });

In some cases, you can add a selection listener to a widget instead of listening for mouse clicks.

How can I stop an event from continuing (ie beforeXXXX event)?

     event.doit=false;

How do I stop a window from closing and ask "Are you sure"?

Use the event.doit=false in a window listener and then add/remove that listener depending on the answer.

Can I use GWT widgets in GXT?

Yes you can.

I've add widgets to a panel, but they don't show up - why?

Call layout() on the panel.

How to create custom components?

You can extend Component, BoxComponent for a sized component, Container for a "layouted" component when you don't want to expose the layout and LayoutContainer for a "layouted" component when you want to expose the layout.

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