Extract data from a LIST component from OUTSIDE THE LIST

[parkjammer]

When I use an action such as "onClick" within a LIST, I am able to retrieve
data from the list using constructs like this:

Result	Action
Works	var MyValue = this.selectionData[0].FIELD_XYZ;

However, if I am outside the LIST and attempting to pick up data using any
object (e.g., BUTTON "onClick" event) then I am unable to get a value.

MyPanel

MySimpleList Row FIELD_ABC FIELD_XYZ 1 Red Chair 2 Blue Knob 3 Green Lever BUTTON

I've watched A5 videos, searched the forum, ensured my field-name capitalization is correct,
checked the in-developer samples and tips and still only manage to get errors or undefined values.

Here's what I've tried:

Result	Action
ERROR	var MyValue = {dialog.object}.getValue('list::MySimpleList::FIELD_XYZ'); Error: "Object doesn't support property or method 'getValue' "
Returns "undefined"	var MyValue = {dialog.object}.listGetValue('MySimpleList','FIELD_XYZ',0)
ERROR	var MyList_ID = {dialog.object}.getControl('MySimpleList'); var MyValue = MyList_ID.getValue(0).FIELD_XYZ; Error: "Object doesn't support property or method 'getValue' "

I've tried a dozen variations on the theme. I've done exactly what has been done in the
videos.

To no avail thus far.

Any input, examples, or direction will be appreciated.

[Selwyn Rabins]

Re: Extract data from a LIST component from OUTSIDE THE LIST

perhaps this video will clear things up for you

http://screencast.com/t/MUCghmmxl

[parkjammer]

Re: Extract data from a LIST component from OUTSIDE THE LIST

Selwyn's video demonstrates a working "button gets LIST-data".

Having already tried several forms of the same thing, I was at least able to
determine that I'm not completely nuts and that I had been doing the right
things.

So... it had to be something else.

I separated the "populate LIST" and "get data" actions into two buttons
and... the same exact commands were able to work!

The answer was timing. The LIST was populating too late and the button's
request for data was too early.

So simply checking the box on the option "Run actions synchronously" fixed the problem.

Thanks for your help Selwyn.

Onwards!

[kiwibruce]

Re: Extract data from a LIST component from OUTSIDE THE LIST

Selwyn, good video, thanks

This would be a great video / example to add to the video list / documentation as I am sure Allan will not be the last person to need to do this.

B

[gregincolumbus]

Re: Extract data from a LIST component from OUTSIDE THE LIST

Good video..definitely helped me as well.....thanks Selwyn

[Selwyn Rabins]

Re: Extract data from a LIST component from OUTSIDE THE LIST

Selwyn's video demonstrates a working "button gets LIST-data".

Having already tried several forms of the same thing, I was at least able to
determine that I'm not completely nuts and that I had been doing the right
things.

So... it had to be something else.

I separated the "populate LIST" and "get data" actions into two buttons
and... the same exact commands were able to work!

The answer was timing. The LIST was populating too late and the button's
request for data was too early.

So simply checking the box on the option "Run actions synchronously" fixed the problem.

Thanks for your help Selwyn.

Onwards!

it is critically important for any developer of ajax applications (regardless of whether you are using alpha, php, asp.net, ruby, whatever) to understand the nature of ajax callbacks: they are asynchronous. that's the "A" in "AJAX". so you can't simply chain javascript commands together and expect then to operate in a nice sequential order.

one of the major additions to v12 was the addition of the 'run actions synchronously' checkbox to the action javascript editor to turn a set of synchronous actions into a set of synchronous actions.