knockout.js - Knockout validation message based set in the validation function -

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i want set message display in validation function of knockout similar whats going on here: knockout validation plugin custom error message without async.

heres ive tried, no validation message displayed.

this.name = ko.observable().extend({     validation: {         validator: function (val) {             return { isvalid:val === 'a', message: 'the value ' + val + ' not a' };         },         message: 'i dont want default message'     } });

jsfiddle

is there way this?

close, validator should returning true/false if rule passed. couldn't message: display value (even setting function had undefined arguments) can inline error message if want display value user.

this.name = ko.observable().extend({     validation: {         validator: function (val) {             if (val !== 'a') {                 this.message = 'the value ' + val + ' not a';                 return false;             }             return true;         }     } });

http://jsfiddle.net/gewex/10/


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