Having trouble with a cascading dropdown. Basically, I have an editable grid tha

RE: Having trouble with a cascading dropdown. Basically, I have an editable grid tha

sikhivahans — Fri, 02 Oct 2015 01:10:17 GMT

@judym Happens some times with most of us.! Glad to hear that the problem is resolved. :)

RE: Having trouble with a cascading dropdown. Basically, I have an editable grid tha

judym598 — Fri, 02 Oct 2015 01:07:25 GMT

That was it! I knew it had to be a simple thing. I'm so used to saving the 'id' that I didn't pick up on that. Thank you SO much!

RE: Having trouble with a cascading dropdown. Basically, I have an editable grid tha

sikhivahans — Fri, 02 Oct 2015 00:59:27 GMT

@judym Got it, very simple. You are trying to use a field which is not present in your data structure.

So let' see the below line which is of "Area of Expertise" dropdown:
choiceValues: index(local!expertise.data,"id",{})
Here we are trying to access a column by name 'id' in the queried data. As it isn't present, you are not able to obtain any values for 'choiceValues' attribute.

So your actual code should look like this I guess:
choiceValues: index(local!expertise.data,"expertiseId",{})

If my assumption is correct, please try the attached file once again and have a keen look at "Area of Expertise" dropdown.

RE: Having trouble with a cascading dropdown. Basically, I have an editable grid tha

judym598 — Fri, 02 Oct 2015 00:48:22 GMT

Column Names are: expertiseLinkId (int), userId (int), lastName(text), firstName(text), expertiseId (int), expertise(text). rule!ips_getExpertiseByUserId() is a query rule with input being 'userId' and query conditions userId = userId, sort by expertise.
I'm not sure I tested the code above correctly. I created an expression rule and put
=with(
local!expertise: rule!ips_getExpertiseByUserId(ri!userId),
local!expertise_datasubset: todatasubset(local!expertise),
index(local!expertise_datasubset,"id",{})
)
with one input (userId[int]), assigned a test value of '6' that should bring back results and got {}
Attached is a screen shot.

RE: Having trouble with a cascading dropdown. Basically, I have an editable grid tha

sikhivahans — Fri, 02 Oct 2015 00:38:44 GMT

@judym Some more information please - May I know the column names exactly and also if rule!ips_getExpertiseByUserId() is a query rule?

Meanwhile could you please test the following code in an expression rule separately and do let me know the outcome?

with(
\ tlocal!expertise: rule!ips_getExpertiseByUserId(),
\ tlocal!expertise_datasubset: todatasubset(local!expertise),
\ tindex(local!expertise_datasubset,"id",{})
\t )

RE: Having trouble with a cascading dropdown. Basically, I have an editable grid tha

judym598 — Fri, 02 Oct 2015 00:26:59 GMT

You are correct with your assumption. expertiseId is of type integer and expertise is of type text. The query rule basically gets all data where 'userId = userId' and sorts by expertise. The actual data type has an id (a/I), userId, expertiseId, and expertise. So userId 4 may have 3 records (areas of expertise) in the table whereas userId 6 may have 2 areas of expertise. All users have at least 1 record in the table. Does that help?

RE: Having trouble with a cascading dropdown. Basically, I have an editable grid tha

sikhivahans — Fri, 02 Oct 2015 00:20:52 GMT

@judym As I said earlier, it's not a valid version because I am explicitly saving null value into expertiseId. Because I guess expertiseId is of type integer and local!expertise.data.expertise might evaluate to a string and trying to store string into integer will create a new error. So I have just changed the display and also saving null value into expertiseId explicitly. Please take a keen look below:
a!dropdownField(
label: "Area of Expertise",
choiceLabels: local!expertise.data.expertise,
choiceValues: local!expertise.data.expertise,
placeholderLabel: "---Assign Area of Expertise---",
\ t/*Null handling being done for value attribute*/
value: if(rule!APN_isEmpty(ri!newTeamLink_cdt[ri!index]),null,if(rule!APN_isBlank(ri!newTeamLink_cdt[ri!index].expertiseId),null,ri!newTeamLink_cdt[ri!index].expertiseId)),
saveInto: {
\ ta!save(ri!newTeamLink_cdt[ri!index].expertiseId,null)
\ t},
required: true(),
readOnly: false()
)

If you could let me know the data structure of expertise and the definition of rule!ips_getExpertiseByUserId() I could try to help you debug the issue.

RE: Having trouble with a cascading dropdown. Basically, I have an editable grid tha

judym598 — Fri, 02 Oct 2015 00:15:18 GMT

What you sent DID allow me to see the correct values (filtered based on userId) in the dropdown. It's just not saving them now. I think I'm close now!

RE: Having trouble with a cascading dropdown. Basically, I have an editable grid tha

sikhivahans — Fri, 02 Oct 2015 00:14:10 GMT

@judym Great, please keep posted here if you have further issues. Still if you are not able to spot out the issue, Appian practitioners are here to help you always.

RE: Having trouble with a cascading dropdown. Basically, I have an editable grid tha

judym598 — Fri, 02 Oct 2015 00:10:38 GMT

I wondered the same thing so I just created an expression rule to test my query rule and it does bring back values. I'll take a look at what you've sent. Thank you again.

RE: Having trouble with a cascading dropdown. Basically, I have an editable grid tha

sikhivahans — Fri, 02 Oct 2015 00:06:01 GMT

@judym No problem at all. Now everything looks good to me so far.

Are you sure that the value configured by you - index(local!expertise.data,"id",{}) for 'choiceValues' for "Area of Expertise" is returning valid values? I doubt this, because the error is clearly saying that choiceLabels are perfectly populated where as the choiceValues aren't.

Just in case if you aren't sure about the above question, I am sending you an other version(please find attached the code snippet), which is not valid but will help you skip the error and load the interface and then you can start debugging.

RE: Having trouble with a cascading dropdown. Basically, I have an editable grid tha

judym598 — Thu, 01 Oct 2015 23:54:44 GMT

Argh! I really appreciate your help @sikhivahans...Unfortunately, I'm still getting an error.
Expression evaluation error in rule 'ips_assignuserrolesgrid' (called by rule 'ips_assignuserrolesmain') at function a!applyComponents [line 100]: A dropdown component [label=“Area of Expertise”] has an invalid value for “choiceValues”. The choiceLabels and choiceValues arrays must be the same length, but choiceLabels was length 4 and choiceValues was length 0.

RE: Having trouble with a cascading dropdown. Basically, I have an editable grid tha

sikhivahans — Thu, 01 Oct 2015 23:45:44 GMT

@judym I have just made one more change. Please find attached the code snippet. Do let me know if there are any issues again.

Actually there is some confusion because of the todatasubset() conversions which were being done in the interface and they aren't actually needed as said by me earlier in the post. Let's remove these conversions when you get the interface up and working. Coming to if conditions, they are needed because your interface fails if null values aren't handled properly. But you could test the interface rigorously and remove them if needed at a later point.

RE: Having trouble with a cascading dropdown. Basically, I have an editable grid tha

judym598 — Thu, 01 Oct 2015 23:40:24 GMT

I just found in the documentation that you need to initialize the local variable to a null integer because local variables have no type. In the example they did the following:
local!make: tointeger(null) I'm going to try doing that to the 'null' values in the initial local variable.

RE: Having trouble with a cascading dropdown. Basically, I have an editable grid tha

judym598 — Thu, 01 Oct 2015 23:31:35 GMT

Just realized you changed something else, so I made that change and now the error I'm getting (before I select a user now): Expression evaluation error in rule 'ips_assignuserrolesgrid' (called by rule 'ips_assignuserrolesmain') at function a!applyComponents [line 100]: Cannot compare incompatible operands of type Null and type Number (Integer).

RE: Having trouble with a cascading dropdown. Basically, I have an editable grid tha

judym598 — Thu, 01 Oct 2015 23:27:56 GMT

Actually, it is up there. There are so many 'if' statements in this rule, it's confusing.

RE: Having trouble with a cascading dropdown. Basically, I have an editable grid tha

judym598 — Thu, 01 Oct 2015 23:26:12 GMT

Still not working. I got this error: Expression evaluation error in rule 'ips_assignuserrolesgrid' (called by rule 'ips_assignuserrolesmain') at function a!applyComponents [line 100]: A dropdown component [label=“Area of Expertise”] has an invalid value for “choiceValues”. The choiceLabels and choiceValues arrays must be the same length, but choiceLabels was length 4 and choiceValues was length 0.

Shouldn't I have the todatasubset text at the top where I have it for the other dropdowns?

RE: Having trouble with a cascading dropdown. Basically, I have an editable grid tha

sikhivahans — Thu, 01 Oct 2015 23:18:15 GMT

@judym Please try the attached code snippet. FYI, I have just wrapped the query rules in todatasubset(). I hope that choiceLabels and choiceValues of "Area of Expertise" gives a valid set of values.

ips_assignUserRolesGrid_new3.txt

RE: Having trouble with a cascading dropdown. Basically, I have an editable grid tha

judym598 — Thu, 01 Oct 2015 23:07:09 GMT

I got the error after I tried to select a value from the 3rd dropdown. The first two worked.

ips_assignUserRolesGrid_new3.txt

RE: Having trouble with a cascading dropdown. Basically, I have an editable grid tha

sikhivahans — Thu, 01 Oct 2015 23:01:01 GMT

@judym Could you upload the code snippet again which you are using as it would help me to see the correct 100th line? Also if possible I would like to suggest to check the logs as they might give you a clear idea of where the error is. Also are you not able to see the interface initially or are you experiencing the error after after the selection of Employee Role?

RE: Having trouble with a cascading dropdown. Basically, I have an editable grid tha

judym598 — Thu, 01 Oct 2015 22:51:31 GMT

Nope - didn't work. Still no values in the dropdown and now I'm getting this error:Expression evaluation error in rule 'ips_assignuserrolesgrid' (called by rule 'ips_assignuserrolesmain') at function a!applyComponents [line 100]: (which basically points to the grid rule.

RE: Having trouble with a cascading dropdown. Basically, I have an editable grid tha

sikhivahans — Thu, 01 Oct 2015 22:39:11 GMT

@judy We missed populating the local!expertise when the value of the userId is set via 'Active Employees' Dropdown. Trying the below dropdown for 'Active Employees' might be worth.

a!dropdownField(
label: "Active Employees",
choiceLabels: apply(rule!ips_formatUserName, local!users.data),
choiceValues: index(
local!users.data,
"id",
{}
),
placeholderLabel: "---Select User---",
value: if(rule!APN_isEmpty(ri!newTeamLink_cdt[ri!index]),null,if(rule!APN_isBlank(ri!newTeamLink_cdt[ri!index].userId),null,ri!newTeamLink_cdt[ri!index].userId)),
saveInto: {
ri!newTeamLink_cdt[ri!index].userId,
\ t /*Populate the local!expertise based on the value set for userId*/
\ t a!save(
\ tlocal!expertise,
\ tif(
\ trule!APN_isBlank(ri!newTeamLink_cdt[ri!index].userId),
\ tnull,
\ trule!ips_getExpertiseByUserId(ri!newTeamLink_cdt[ri!index].userId)
\ t)
\ t )
\ t /*Always set expertiseId to null because expertise dropdown data changes upon the change in the value of userId. So you should also set expertiseId to null.*/
\ t a!save(ri!newTeamLink_cdt[ri!index].expertiseId,null)
},
required: true(),
readOnly: false()
)

RE: Having trouble with a cascading dropdown. Basically, I have an editable grid tha

judym598 — Thu, 01 Oct 2015 22:33:21 GMT

Found the missing parenthesis and now I'm not getting any errors but there are no values displayed for the last dropdown.

RE: Having trouble with a cascading dropdown. Basically, I have an editable grid tha

sikhivahans — Thu, 01 Oct 2015 22:30:54 GMT

@judym Great, no worries. By the way I haven't checked the syntax as I just wanted to put forward my idea. You could let me know if you are struck again.

RE: Having trouble with a cascading dropdown. Basically, I have an editable grid tha

judym598 — Thu, 01 Oct 2015 22:27:53 GMT

Thanks @sikhivahans. I understand what you did. I'm testing this now but there seems to be an unmatched open parenthesis....I'll let you know how it goes once I find it.