Knockoutjs.com - Contacts Editor

http://stackoverflow.com/questions/11812925/inserting-values-into-knockout-viewmodel

HTML

<script src="http://github.com/downloads/SteveSanderson/knockout/knockout-2.1.0.js"></script>
<div class="liveExample"> 
   
    <div>
        <input type="text" placeholder="question" data-bind="value:inputQ.question">
         <input type="text" placeholder="type" data-bind="value:inputQ.qtype">
          <button data-bind="click: addQuestion">Add a question</button>
        </div>
    <div id="questionList">
            <ul data-bind="foreach: questions" id="sortable" class="ui-sortable">
                    <li>
                        <label data-bind="text: question">Question 1</label></li>
            
                   
            </ul>
    </div>
    <p>
        <button data-bind="click: save, enable: questions().length &gt; 0">Save to JSON</button>
    </p>
    <textarea data-bind="value: lastSavedJson" rows="5" cols="60" disabled="disabled"> </textarea>    
</div>

CSS

body { font-family: arial; font-size: 14px; }

.liveExample { padding: 1em; background-color: #EEEEDD; border: 1px solid #CCC; max-width: 655px; }
.liveExample input { font-family: Arial; }
.liveExample b { font-weight: bold; }
.liveExample p { margin-top: 0.9em; margin-bottom: 0.9em; }
.liveExample select[multiple] { width: 100%; height: 8em; }
.liveExample h2 { margin-top: 0.4em; font-weight: bold; font-size: 1.2em; }

.liveExample TR { vertical-align: top; }
.liveExample TABLE, .liveExample TD, .liveExample TH { padding: 0.2em; border-width: 0; margin: 0; }
.liveExample TD A { font-size: 0.8em; text-decoration: none; }
.liveExample table.contactsEditor > tbody > TR { border-bottom: 1px solid silver; }
.liveExample td input { width: 8em; }

li { list-style-type: disc; margin-left: 20px;font-size:1.2em }

JavaScript

var initialData = [
    {
    question: "Question 1",
    qtype: "Feedback"},
{
    question: "Question 2",
    qtype: "Rating"}
];

var Question = function(q, t) {
    var self = this;
    self.question = ko.observable(q);
    self.qtype = ko.observable(t);
    return self;
};

var ViewModel = function(questions) {
    var self = this;
    self.questions = ko.observableArray(ko.utils.arrayMap(questions, function(question) {
        return new Question(question.question, question.qtype);
    }));

    self.inputQ = new Question();

    self.addQuestion = function() {
        self.questions.push(new Question(self.inputQ.question(), self.inputQ.qtype()));
    };

    self.removeQuestion = function(question) {
        self.questions.remove(question);
    };

    self.save = function() {
        self.lastSavedJson(JSON.stringify(ko.toJS(self.questions), null, 2));
    };

    self.lastSavedJson = ko.observable("");
};

var view_model = new ViewModel(initialData);

ko.applyBindings(view_model);

$(function() {
    $( "#sortable" ).sortable({
        revert: true,
        stop: function(event, ui) { console.log("stop event")},
        
        
        start : function ( event, ui ) {

            ui.item.data( 'previous_index', ui.item.index() );
        
        },
        // start
        
        
        update : function ( event, ui ) {
        
            var question = view_model.questions.splice(
            
              ui.item.data( 'previous_index' ), 1
              
            )[0];
            
            view_model.questions.splice( ui.item.index(), 0, question );
            
            ui.item.removeData( 'previous_index' );
        
        }
        // update
        
    });
});