knockout.js - KO data-binding "text:" to a function with a parameter -


is possible in way following without have pass through temporary observables / computed observables? have common data used lookups display data:

<span data-bind="text: lookupcontactname(31)"></span>

result: function exectuded, parameter found, logic ok, , computed full name returned, not displayed (probably since no observable)

<span data-bind="text: lookupcontactname(contactid)"></span>

result: contactid not parsed correct parameter value not visible.

i suppose work correctly need create custom bindings?

in general: started doubting bit whether or not approach load data once , try match id's approach. views? i'm better of creating joined db tables / views / sp's?

thanks, j.

here, relevant code pieces i'm using... learn jsfiddle future help.

all alert's returning expected values... still text data-binding doesn't receive value

a common data library:

customers.contact = function () {     var self = this;      id = ko.observable();     title = ko.observable();     givenname = ko.observable();     surname = ko.observable();     fullname = ko.computed(function () {         return title()+". "+givenname()+" "+surname();     });      return {         id: id,         title: title,         givenname: givenname,         surname: surname,         fullname: fullname     }; }; customers.contactlist = function () {      var self = this;      contactlist = ko.observablearray([]); //.publishon("contactlist");      loadcontactdata = function () {         var self = this;          customers.helperdataservice.getcontactdata(loadcontactdatacallback);     };      loadcontactdatacallback = function (json) {         var self = this;          $.each(json, function (i, p) {              var contact = new customers.contact().id(p.id)                                                   .title(p.title)                                                   .givenname(p.name)                                                   .surname(p.surname);              contactlist.push(contact);         });      };      lookupcontactname = function (id) {         var self = this;         alert("value found: "+id);          ko.utils.arrayforeach(contactlist(), function (contact) {             alert("search:  contactid: " + contact.id() + " - " + "id: " + id);             if (contact.id() === id) {                 alert("found: contactid: " + contact.id() + " - " + "id: " + id);                 alert("value:" + contact.fullname());                 return contact.fullname();             }         });     };      return {         loadcontactdata: loadcontactdata,         lookupcontactname: lookupcontactname     }; };

which called here... (i changed contactid() , passes correct value function)

<div>creator: <span data-bind="text: lookupcontactname(contactid())"></span></div>

if <span data-bind="text: lookupcontactname(contactid())"></span> in foreach loop need prepend method $root or else "lookupcontactname" within array looping trough.

try: 

<div>creator: <span data-bind="text: $root.lookupcontactname(contactid())"></span></div>

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