CODEWITHSUNDEEP
jqueryvalidationknockout.js
super cool
super cool

Reputation: 6045

How to do a validation to find duplicate entries ? knockout

I have a scenario when i dynamically add multiple rows using template way i need to write down a validation if CountryCode (which should be unique) having same value in two or more dynamically generated rows .

working fiddle : http://jsfiddle.net/JL26Z/73/

Well i am thinking can this be possible using custom validation code but i am not sure how to proceed i mean how to compare in validator function inside validation .

And the same can be done on click of submit in save function like we run a foreach each aganist every row code and do it but is it a good practice .

My view model:

 function Phone() {
        var self = this;
        self.Code = ko.observable(""); // this should be unique 
        self.Date = ko.observable("");
        self.PhoneNumber = ko.observable("");

        self.Validation = ko.validatedObservable([
            self.Code.extend({ required: true }),
            self.Date.extend({ required: true }),
            self.PhoneNumber.extend({ required: true })
        ]);
         } 

    function PhoneViewModel() {
        var self = this;
        self.PhoneList = ko.observableArray([new Phone()]);
        self.remove = function () {
            self.PhoneList.remove(this);
        };
        self.add = function () {

            self.PhoneList.push(new Phone()); // i add on click of add button 
        };
    }

    ko.applyBindings(new PhoneViewModel());

Any suggestions are appreciated .

Upvotes: 0

Views: 1453

Answers (2)

Nikunj Madhogaria
Nikunj Madhogaria

Reputation: 2307

Add the following jQuery in $(document).ready(function(){});, and it will show you the repeated text fields:

$(document).ready(function () {
    $("input:submit").click(function () {
        $("input:text").each(function(){
            var index = $(this).index("input:text") % 3;
            var value = $(this).val();
            $("input:text").not(this).each(function(){
                if($(this).index("input:text") % 3 == index && $(this).val() == value && $(this).val()!="")
                    $(this).next().show().text("Repeated");
            });
        });
    });
});

DEMO (with your fiddle).

Upvotes: 1

Tomalak
Tomalak

Reputation: 338326

First, in your set-up:

// straight from https://github.com/Knockout-Contrib/Knockout-Validation
ko.validation.rules['mustEqual'] = {
    validator: function (val, otherVal) {
        return val === otherVal;
    },
    message: 'The field must equal {0}'
};

Later, in PhoneViewModel:

self.codesAreUniuqe = ko.computed(function () {
    var codes = {}, 
        valid = true;

    // group by code, count occurrences
    ko.utils.arrayForEach(self.PhoneList(), function (phone) {
        var code = phone.Code();
        codes[code] = codes[code] ? codes[code] + 1 : 1;
        valid = valid && codes[code] === 1;
    });

    return valid;
}).extend({ mustEqual: true });

Upvotes: 1

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