Confiform "Set expression" does not work when field is updated by backspace

[Alice Liu]

Hi Team,

I have set below structure for users to input several fields, and provide a total using Field Definition Rules with "set expression" to calculate total. The total can be successfully calculated in the beginning.

However, the problem is that if user updates any field with "backspace" instead of input "0," the "set expression" rule seems can not work and will return below message:

"COM.VERTUNA.CONFLUENCE.PLUGINS.CONFIFORMS.UTIL.EXPRESSION$EXPRESSIONEXCEPTION: TOO MANY OPERATORS OR FUNCTIONS AT: +"

It is weird because if user input "0," then the total can be calculated correctly. I have tested multiple times, and seems only "backspace" would cause the calculation fail.

Could you advise?

Ps. The structure:

- Field A: $user input amount

- Field B: $user input amount

- Fied C: read-only to display calculated result

- Rule 1 for Field A (calculate total when there is input):

condition = empty

action = set expression

value = Field C = [entry.Field A] + [entry.Field B]

- Rule 2 for Field A (put "0" when there is no input):

condition = empty

action = set value if empty

value = Field A = 0

Rules on Field B is similar to on Field A.

[Alex Medved _ConfiForms_ · Accepted solution]

Hi @Alice Liu and welcome to this community

Fix your expression to handle the empty value

FieldC=ZEROIFEMPTY("[entry.FieldA]") + ZEROIFEMPTY("[entry.FieldB]")

Alex 

[Alice Liu]

Hi Alex,

Thanks for the greeting and prompt reply!

I may not express my question clearly, but I did not set empty value rule on Field C.

The empty value "0" rule is set on Field A and Field B.

And my problem is that if in the beginning user input:

Field A = 100

Field B = 100

Then Field C can correctly display total 200.

But if then user use "backspace" to eliminate Field A's or Field B's value, then Field C will show the COM.VERTUNA message stated in my above post.

i.e. if afterwards user input:

Field A = 100 >> empty  (using "backspace" instead of input "0")

Field B = 100

Field C = COM.VERTUNA.CONFLUENCE.PLUGINS.CONFIFORMS.UTIL.EXPRESSION$EXPRESSIONEXCEPTION: TOO MANY OPERATORS OR FUNCTIONS AT: +

But if user input Field A = 100 >> 0, then Field C will show 200.

Hope this example explain better. Could you help to see what I can change to solve this problem?

[Alex Medved _ConfiForms_]

OK, and that is exactly what I was trying to help you with...

Let me try with the demo this time, I hope it helps

http://recordit.co/nAxvkpVRpp

Alex

[Alice Liu]

Hi Alex,

The demo is very clear and helpful. I tried on my case and the problem is solved.

Thank you!