onchange client script, oldValue is not coming in the alert.

[Community Alums]

Hi All,

Its a Yes/No catalog variable. I have written a onchange client script. The requirement is something like "if the particular field changes from Yes to No, do the logic". 

So i wrote like below, if (oldValue is Yes & newValue is No) but its not working. Even the alert in the 5th line is empty for oldValue, newValue alert is coming.

[Ankur Bawiskar]

@Sirraj 

So if the form loads and the none option is by default then it would be empty as

oldValue will be None

None -> means empty

If you don't want None and by default it should be Yes then don't include None

Regards
Ankur

[Community Alums]

Ya Ankur, none will be empty only.

But consider this scenario,

a) Form loads default value is none, now i change the value to yes.

So my oldValue is empty and newValue is Yes.

b) Now i change the value from Yes to No. In this case it should be

oldValue is Yes and newValue will be No. 

Correct? This is the expected behaviour right?

[Mark Roethof]

No this is not correct. newValue does not work this way. That's why I was asking for more details on your case. What you are describing will not work with using oldValue. oldValue is the original value, this is not the value from before an onchange, its the original value from the form load.

Kind regards,
Mark
2020, 2021 ServiceNow Community MVP
2020, 2021 ServiceNow Developer MVP

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[Ankur Bawiskar]

Hi,

please check these points

1) oldValue: value of the field when the form loaded and prior to the change.

So it means oldValue is always None

2) the oldValue is the original value of the field when the page first loads, so doing a comparison against the oldValue is always  comparing with the original field value.

Regards
Ankur

[Community Alums]

Thanks Ankur, for the screenshot. But do you have any other idea how we can implement this, only when value changes from Yes to No.