set the label text when a response is returned as "undefined"

[Lau]

How can I set the label text when a response is returned as "undefined" ?
What should I configure on the component Completed event to recognize if the result is "undefined" so I can change the label accordingly?

[Alena Prykhodko]

Hello!

Do you mean when Service failes?

[Lau]

No, I mean the service returns as Completed with a response of "undefined"

[maxkatz]

You can use the service callback events to set the value of a label component on a page: http://docs.appery.io/documentation/r...

[Lau]

Hi Max,

Yes I understand the error events and that is what I am trying to use.

The service returns "success" and the label is set to "undefined" since there is no return text.

How can I check that IF the return is success with value undefined to set label to something else?

[maxkatz]

if (myValue == 'undefined') {
do something
}

this is just an example.. 'myValue' is the response that you get.

[Lau]

how can I reference the response?
the response is nil I think, so it sets the label to undefined

[maxkatz]

The 'data' parameter in the 'success' callback has the response. The callbacks are standard jQuery events. You can always refer to jQuery docs to learn more.

[Michael2210441]

Is there a simpler solution to preventing the label from displaying "undefined" when the response item mapped to the label returns null?

[Alena Prykhodko]

You can check this statement with JavaScript and set appropriate value according to your need.