How to apply validations on a!pickerfieldrecord?

Question

Hello there, 
 I am using a!pickerfieldrecord function under search filters to return data. I am applying this on integer field where user can apply multiple filter like 123456,5746875,59867578695,948647 etc at a time. 
 I want to apply a condition while searching that, user should enter 9 digits or atleast 9 digits in order for the search to work. 
 How can i achieve that, i dont want to apply queryfilter as that is not helping the requirement. 
 Added sample code, please suggest if that can be customized!! 
 a!localVariables(
 local!number:{},
 local!isLoanNoValid: if(
 len(local!number) < 9,
 true,
 false
 ),
 a!columnLayout(
 contents:{
 a!pickerFieldRecords(
 label: "Number",
 labelPosition: "COLLAPSED",
 maxSelections: 10,
 /*placeholder: "Please enter 9 digits inorder to start search",*/
 recordType:cons!PAA_record_type,
 value: local!number,
 validations: if(isnull(local!number),
 null,
 if(local!isLoanNoValid,"Please sprovide 9 digit number",{})
 ),
 saveInto:{}
 )
 }
 )
 )

Mike Schmitt · Answer

AFAIK this is not how a record picker field works - it will always start displaying matches basically whenever anything is entered.

GopalK · Answer

Hi, I am not sure if you have tried custom picker field , but you can achieve your requirement using this . while configuring the rule for suggest function you can add a condition. your query will execute only when user types 9 characters. This way you can enhance your performance . I had worked on this kind of requirement long back. I think it can help you too.