Issue mapping Json string with ko.mapping

Question

On the server side I have a Asp.Net Web application, a WebMethod returns a Json string serialized just like this one:

Object { d= "[{"Id":"1","Name":"COMERCIAL BANK"},
 {"Id":"2","Name":"AZTEC BANK"},
 {"Id":"3","Name":"EL SALVADOR BANK"}]" }

When I try mapping that result using var mappedBanks = ko.mapping.fromJSON(data.d), and then use console.log(mappedBanks) all I get printed is c() and is like that mappedBanks, that should be an array, has no elements because I can iterate on it and when I try to print the first element, the console says undefined. Is there a problem with the Json? or I´m not mapping it right.

JavaScript string can't have double quotes inside double quotes. You need either escape them (\") or use single quotes (') inside/outside. — Pavlo
– Pavlo, Commented Oct 12, 2013 at 17:06

Rango · Accepted Answer · 2013-10-12 17:32:35Z

2

ko.mapping.toJSON requires first argument to be an object, not an array. Your option is to make your JSON-encoded array to be property value.

var mappedBanks = ko.mapping.fromJS({ items: JSON.parse(data.d) });
console.log(mappedBanks.items);

answered Oct 12, 2013 at 17:32

Rango

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3 Comments

Guillermo Oramas R. Over a year ago

I did what you told me to, but i´m still getting the "c()" when I print "mappedBanks.Items"

Guillermo Oramas R. Over a year ago

actually it works but I changed it for this "var mappedBanks = { items: JSON.parse(data.d) };" ..

Rango Over a year ago

Your code is the same excepting that items will be plain array, not observableArray.

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