Setting a watch event

[bob9145]

Is there a way to set a watch event on a control in a UX? The closest I can come is the onChange event however a refresh of the controls trigger this event even if the control has no value.

for example:
if Textbox1 > 1
then
{dialog.object}.submit();

[Davidk]

Re: Setting a watch event

Search for "UX Component - Define Custom Watch Events" in http://aadocuments.s3.amazonaws.com/...easeNotes.Html

I couldn't find any other doc on this. Looks like the online documentation has been abandoned. I tried to find some information about a videoplayer control and found multiple 'under construction' pages dating back over a year.

[bob9145]

Re: Setting a watch event

Thanks Dave,
Could I do something like this in the onChange event? Tried this but didn't work.

var control = {Dialog.object}.getControl('Textbox')

if (control > '1') {{dialog.object}.submit();}

[Davidk]

Re: Setting a watch event

I'll assume you want to run onChange code in the 'Textbox' control.

You're using .getControl which gives you a pointer to the control object... not the value of that control. Instead, you'd normally use the .getValue() method.

However, if you're running code in the onChange event of 'Textbox' and you want the value of 'Textbox' then you can reference that value with this.value. For example...

var ctrlValue = parseInt(this.value);
if(ctrlValue > 1){
	{dialog.object}.submit();
}

To ensure you're testing against a number, use parseInt to convert the incoming "string number" to an integer. If you're dealing with decimals, use parseFloat().

[bob9145]

Re: Setting a watch event

Gotcha!

[bob9145]

Re: Setting a watch event

One limitation of the onChange event seems to be that if the field changes programmatic ly the event is not triggered. So say the field is populated using a javascript function
say {dialog.Object}.setValue('Textbox','2'); When this function is run and the control is set (changed) the event is not triggered. Also tried to trigger the event by making textbox a calculated field and changing the associated field that changes the value of textbox. This does not trigger the event. The only way I've found to trigger the event is for the user to change the value and then leave the textbox field. Can not find a work around to this limitation. Any ideas?

[Davidk]

Re: Setting a watch event

I don't know what build of Alpha you're using, but I'm not seeing what you're reporting in the latest official release and pre-release.

onChange of a Textbox Control fires if...

A .setValue() is performed against that control
A value is entered into the control which is different from it's prior value
The control is a Calculated Field Expression and the control value changes (if that change is not a direct input)

onChange of a Textbox Control will not fire if...

You enter a value directly into the control... and that value is equal to that control's prior value

In a sense, .setValue() and Calculated Field Expression are not as smart as direct input. Direct input knows if the value has actually changed... and therefore selectively fires. .setValue and Calculated Field Expression only know that a change occurred... and always fire.

If you're getting different results... and you're using a current build... you should post a sample UX showing the behaviour.

[bob9145]

Re: Setting a watch event

Thanks. That helps clarify things. May be mistaken on this. Did get it to work. Think I have a timing problem.

[Garry Flanigan]

Re: Setting a watch event

Don't know what you want to do but have you looked at the onTimer event?
I use the onTimer event to "click" a button that the executes an ajax callback for an InternalXbasicFunction. This is where the "watching" is done, i.e. you run code to detect if what you are interested in has changed and then do stuff as required.
It means I can also manually click the button to execute on demand.