Hi all,
I'm diving right now into Qooxdoo data binding; really nice
implementation ! I've got some questions though.
I'm trying to implement a bi-directional binding between a textfield and
some value object that has a "value" property with an associated
"changeValue" event. So I use a qx.data.controller.Object around my
value object and bind the textfield bi-directionally as a target :
modelController.addTarget(textField, "value", "value", true);
So far, so good.
The problem comes from the fact that qx.ui.form.TextField doesn't allow
for null value (only empty string, right ?), and my value object does...
Is there any reasoning behind preventing handling textfield null value
as empty string behind the scene, cause it seems to me a quite common
use-case.
Anyway, I then leveraged binding options and reversOptions to add a
"converter" that transforms null into "" and vice versa. Now the problem
comes from the fact that the qx.ui.form.TextField value is not a real
Qooxdoo property. It only has accessors and event. Then, at runtime it
complains that there is no "resetValue()" method on textfield when my
value object "value" property is null. I checked the source and the
converter functions are not used when testing for null value and
triggering the reset property. So the final workaround was to add a
resetValue method (not very clean...) :
textField["resetValue"] = function() {textField.setValue("");}
What would make sense to me is :
- support target properties that are not actual Qooxdoo properties, i.e.
only have accessors (and even only a setter if it's a one-way binding
?). This would imply testing for the presence of all the derived
property methods like "resetXXX" before execution.
- use the converter functions, if any, before testing for model "null"
property value and then triggering the "resetXXX" method.
- allow for null values in qx.ui.form.AbstractField derived classes that
should be handled as the empty string.
Would it make sense ?
Regards,
Vincent
--
Vincent Vandenschrick
Jspresso Framework
http://www.jspresso.org
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