DX Custom Rule

[DerickO-Nedbank]

Hi guys,

I'm writing a Vue app with a form containing 3 fields (ID, Profile, Account). All 3 are number fields.

I need to write a validation rule that checks that at least one of the 3 is populated.

From what I understood - I could do this with a custom rule.

I have 2 questions:

1. Is there a way to debug dx expressions? I'm happy to figure them out - but find it hard without being able to see them evaluate.
2. My idea was to use a rule like the example below on each of the 3 fields and to tell each one to fire the other 2 rules, so that they all update at roughly the same time.

Can you please see if I'm on the right track? I've tried various expressions, but I can't seem to hit the right one and I also don't see the two other rules fire when the first one evaluates....

This is the rule on the "id" field:

"rules":{
"customRule": [{
"script": "dx: !{{$root.Victim.identityNumber}} && !{{$root.Victim.profileNumber}} && !{{$root.Victim.accountNumber}} ",
"errMsg": "You need to specify at least one of the following: an ID Number or Profile number or Account number",
"linkItems": [
{
"fieldPath": "profileNumber",
"customRuleIdx": 0
},
{
"fieldPath": "accountNumber",
"customRuleIdx": 0
}
]
}]
}

Many thanks,
D

[daniel-dx]

1. Q：Is there a way to debug dx expressions? I'm happy to figure them out - but find it hard without being able to see them evaluate.
   A: You can use function style of dx to debug the value, refer to https://github.com/ncform/ncform#dx-expression

2. Q: My idea was to use a rule like the example below on each of the 3 fields and to tell each one to fire the other 2 rules, so that they all update at roughly the same time.
   A: Refer to this example: https://codepen.io/daniel-dx/pen/eYBKXVL. But there has some problems:

   1. you must hide the "*" symbol by yourself (may be by overriding the style)
   2. there is a bug that when the required message show and the filed's rule become no required, the required message cannot hide automatically(this i will fix it as soon as possble)

[DerickO-Nedbank]

Thanks Daniel!

I totally missed the note about function-style dx expressions - that's really brilliant. Does this mean that the dx-syntax is just there to enable a shorter form for writing very simple expressions or is there a performance penalty in choosing one style over the other? I would imagine the dx-expressions must be slightly slower - since they need to be parsed/processed? (probably not even measurable for most common situations).

I'll leave this issue open until the bug is fixed. If you have another issue tracking the bug - please feel free to close this one.

[daniel-dx]

If you want to pass the schema to server, you can only use the string-style dx.
And if you just write the schema in the code, you can feel free to use the function-style