CODEWITHSUNDEEP
javascriptvalidationknockout.jsknockout-3.0
laskdjf
laskdjf

Reputation: 1183

How to validate in knockout js for at least one field must be filled

I have 4 fields, each have their own custom validation but non are required. How would I put a validation so that at least one of the field must be filled. 

self = this;

self.acc = ko.observable().extend({ acc: true });
self.Id = ko.observable().extend({ id: true });
self.Name= ko.observable().extend({ name: true });
self.Number = ko.observable().extend({ number: true});

I know that there is onlyIf for the required extender but im not sure if that is the correct way to handle this type of validation.

Upvotes: 2

Views: 485

Answers (1)

dfperry
dfperry

Reputation: 2258

In a situation like this, I just make a separate computed that does special validation like that. This computed can be used to enable/disable the ability to submit a form, or what have you.

self.atLeastOneFilled = ko.computed(function(){
    // note: number will need a different validation if zero is allowed (null check, for example)
    return self.acc() || self.Id() || self.Name() || self.Number();

});

Upvotes: 2

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