Phonegap contact sort order on ios

Does开发者_C百科 anyone know how to sort the contact data that phonegap liberates from iOS to javascript. The order at the moment is nothing to do with alphabetical sorting. I want to sort on last name.

Here is my contact code:

function init_contacts() {
     var fields = [ "name","phoneNumbers"];
     navigator.service.contacts.find(fields, contactSuccess, contactError, '');
}
function contactSuccess(contacts) {
    for (n = 0; n < contacts.length; n++) {
        if (contacts[n].phoneNumbers) {
            for (m = 0; m < contacts[n].phoneNumbers.length; m++) {
                addToMyContacts(contacts[n].name.formatted, contacts[n].phoneNumbers[m].value);
                console.log('Found ' + contacts[n].name.formatted + ' ' + contacts[n].phoneNumbers[m].value);
            }
        }
}
$("#my_contacts").listview("refresh"); 
};

function contactError() {
    navigator.notification.alerter('contactError!');
};

You can do this sort by hand in Javascript.

var cSort = function(a, b) {
  var aName = a.lastName + ' ' + a.firstName;
  var bName = b.lastName + ' ' + b.firstName;
  return aName < bName ? -1 : (aName == bName ? 0 : 1);
};

function contactSuccess(contacts) {
  contacts = contacts.sort(cSort);
  ...
};

For more fun and cleaner code you may consider using lodash

contacts = _.sortBy(contacts, ['last_name', 'first_name']);

sorting in js

function sortByitemName(a, b) { var x = a.displayName.toLowerCase(); var y = b.displayName.toLowerCase(); return ((x < y) ? -1 : ((x > y) ? 1 : 0)); }

function onSuccess(contacts) {

contacts.sort(sortByitemName);

 }

I am using this method, which is far more efficient (compared to the accepted answer)

var cSort=function(a,b){ 
        var an=a.name.formatted.toUpperCase();
        var bn=b.name.formatted.toUpperCase();
        return (an<bn)?-1:(an==bn)?0:1;
    };

function contactSuccess(contacts) {
  contacts = contacts.sort(cSort);
  ...
};

1. Contact.name.formatted is more consistent across platforms
2. All names starting with the same letter will be grouped together irregardless of the case. (you can also try it to see).