Also, you're not cluttering the global namespace so much.
The bigger the application, the bigger that problem will become.
Danny
On 5/12/06, Simon Bull <[EMAIL PROTECTED]> wrote:
Hi Christian,
With an ObjectRegistry you can use code to iteratively create and register
instances. E.g.; you couldn't do this and maintain global references to
each instance:
for (name in propertySheet) {
var instance = createProperty(name);
}
Simon
Christian Boulanger <[EMAIL PROTECTED]> wrote:
Hello Dann,
what would be the advantage of the object registry over just using
global variables? If you omit the "var" before the variable declaration,
you can access your widget from anywhere...
function foo()
{
globalWidget = new QxWindow;
}
function bar()
{
globalWidget.open();
}
C.
Danny Adair schrieb:
> Hello,
>
> If you want to access objects by a user-defined name from anywhere,
> use the code below (ObjectRegistry.js).
>
> Yesterday, I wanted to access a qooxdoo object from a function which
> hadn't created it.
> Unfortunately, qooxdoo doesn't seem to support that at this stage (and
> iterating through children and checking, e.g., their label/value is
> certainly not a real option).
>
> Google led me to QxObjectDatabase, and that's what this code is based
> on: User-defined strings are mapped to qooxdoo "unique id"s (the
> hashcodes in QxDatabase). I'm not into Javascript (excuse my Python
> indentation style) so I'm sure this can be improved. I didn't do any
> error handling.
>
> Hope this will help others.
>
> Cheers,
> Danny
> [EMAIL PROTECTED]
>
> /*
> Object Registry
>
> Usage:
> 1. Create a global registry object, e.g.
> var object_registry = new ObjectRegistry();
> 2. To register an object under a name, use
> object_registry.set(some_object, 'some object')
> 3. To access an object under its registered name (from anywhere), use
> obj = object_registry.get('some object')
>
> Advanced Usage:
> You can register ObjectRegistry objects to create "sub registries":
> 1. Create a new ObjectRegistry object (does not need to be global), e.g.
> var sub_registry = new ObjectRegistry();
> 2. Register the new sub registry with the global registry, e.g.
> object_registry.set(sub_registry, 'my sub registry')
> 3. To register objects with the sub registry, use
> sub_registry.set(other_object, 'other object')
> 4. If you don't have the sub registry in your scope and want to register
> an object with it, access it through the global registry first:
> object_registry.get('my sub registry').set(other_object, 'other
> object')
> 5. Correspondigly, to access an object registered in the sub registry,
> use
> obj = object_registry.get('sub_registry').get('other
object')
> */
>
> function ObjectRegistry()
> {
> this._mapping = {};
> };
>
> ObjectRegistry.prototype.set = function(obj, id)
> {
> if (obj instanceof ObjectRegistry)
> {
> this._mapping[id] = obj;
> }
> else
> {
> this._mapping[id] = obj.toHashCode();
> };
> };
>
> ObjectRegistry.prototype.get = function(id)
> {
> var entry = this._mapping[id];
> if (entry instanceof ObjectRegistry)
> {
> return entry;
> }
> else
> {
> return QxObjectDataBase[entry];
> };
> };
>
>
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>
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