In general it seems it would be preferable to validate user input on the
client side... if you did this you could use the errorString of the
itemEditorInstance to show the error to the user without having to wait
for the back end, etc. When you do this the error is shown in the cell
where the invalid value was entered (it's a pretty nice feedback mechanism).
The following is a code snippet from a DataGrid itemEditEnd event
handler where check with a CurrencyValidator to see if user input is
valid... if not the errorString is set.
var valueStr:String =
event.currentTarget.itemEditorInstance.text;
var result:ValidationResultEvent =
this.currencyValidator.validate(valueStr, true);
if(result.results != null && result.results.length > 0)
{
event.currentTarget.itemEditorInstance.errorString =
"Value must be valid currency. ($ddd.cc) dollar sign is optional.";
event.preventDefault();
}
else
{
//commit the user edited value...
}
hth
Scott
grantdotcox wrote:
I have a datagrid with editable cells. When the user changes a value
this is saved to the server. When the server identifies a validation
error on the new data, their change is undone, and a warning message
is shown outside of the grid.
Unfortunately, showing this warning message outside of the grid
(updating the text attribute of a Label), will always cause the
currently editing cell to lose focus. In fact, anything that updates
the screen will do this. This can be annoying, as I want other screen
elements to update etc (without becoming focussed themselves), but not
taking the focus away from what the user is currently editing.
Any ideas?
