Question

I am trying to have the functionality of the jQuery selectable list when using KnockoutJS, but can’t get it to work.

Using Custom Bindings I was successful in transforming ul element in a selectable one and creating events handlers for the selected and unselected events. But what do I pass to my ViewModel functions which maintain the selected elements?

Here is my code so far: http://jsfiddle.net/QCmJt/

I am new to all this, so maybe I am approaching this the wrong way…

Answer 1

Ok, I figured a way to pass the data bound to the selected item:

$(ui.selected).tmplItem().data when selecting and
$(ui.selected).tmplItem().data when unselecting.

Here the updated fiddle: http://jsfiddle.net/8RnxC/

Custom binding looks like:

ko.bindingHandlers.selectable = {
        init: function(element, valueAccessor) {
            $(element).attr("id", "selectable").selectable({
                selected: function(event, ui) {
                    vm.selectRequest($(ui.selected).tmplItem().data);
                },
                unselected: function(event, ui) {
                    vm.unselectRequest($(ui.unselected).tmplItem().data);
                }
            });
        }
    };

And my view model:

function viewModel() {
        // Data
        this.requests = ko.observableArray([]);
        this.selectedRequests = ko.observableArray([]);

        // Behaviours
        this.selectRequest = function(request) {
            this.name = "othername";
            // Add to array if not already there.
            if ($.inArray(request, this.selectedRequests()) === -1) {
                this.selectedRequests().push(request);
            }
            var self = this;

        };
        this.unselectRequest = function(request) {
            // Remove from the array.
            this.selectedRequests().splice($.inArray(request, this.selectedRequests()), 1);
        };
    };