ko-sortable - drag between lists

https://github.com/rniemeyer/knockout-sortable

by Asle Gundersby

HTML

<script src="http://knockoutjs.com/downloads/knockout-2.2.1.js"></script>
<script src="https://rawgithub.com/rniemeyer/knockout-sortable/master/build/knockout-sortable.js"></script>
<div id="allocationable-texts" class="menupanel">
    <h4 class="select">Text(s) to allocate:</h4>
    <div class="tb-table">
        <div class="tb-list" data-bind="sortable:{template:'textbatchAllocTmpl',data:$root.allocationableTextbatches,allowDrop:true,beforeMove: $root.preprocessDraggedTexts, afterMove:$root.postprocessDraggedTexts}"></div>
    </div>
    <span>Add text by dragging onto accordion or by pushing the button.</span>
</div>

<hr />
<div id="chosen-texts" class="menupanel">
    <h4 class="select">Text(s) on scene:</h4>
    <div class="tb-table"> 
        <div class="tb-list" data-bind="sortable:{template:'textbatchSceneTmpl',data:$root.thisScenesTextbatches, allowDrop:true, beforeMove: $root.preprocessDraggedTexts, afterMove:$root.postprocessDraggedTexts, options:{update:$root.onUpdate}}"></div>     
    </div>
</div>


<script id="textbatchSceneTmpl" type="text/html"><div class="textbatch scene" data-bind="attr: {'title': title},click: $root.selectedText">
        <span class="sequenceno" data-bind="text: $root.selectedScene().chapterNo() + '.' + sequenceNoInProject() + ' '"></span>
        <span class="tb-title" data-bind="text: title"></span>
        <a class="undo-textallocation" data-bind="click: function(){$root.undoTextAllocation($data)}"><span>x</span></a>
</div></script>


<script id="textbatchAllocTmpl" type="text/html"><div class="textbatch alloc" data-bind="attr: {'title': title},click: $root.selectedText">
        <span class="sequenceno" data-bind="text: $root.selectedScene().chapterNo() + '.' + sequenceNoInProject() + ' '"></span>
        <span class="tb-title" data-bind="text: title"></span>
        <button class="btn btn-success btn-xs wysTextbatchAddButton right" title="Add text to selected scene" data-bind="click: $root.addTextbatchToScene"...

CSS

body {
    font-family: arial;
    background: lightgrey;
}
p, a, input {
    font-size: .8em;
}

#allocationable-texts, #chosen-texts{
  width: 300px;
}

span.title {
    font-size: 10px;
    vertical-align: text-top;
    line-height: 9px;
    display: block;
    margin-bottom: 1px;
    word-break:normal;    /* when showing group description we want this - also with long email-adresses. breaks on words and hyphen*/
}
span.title {
    margin-top: 1px;
    margin-bottom: 0px;
}
.tb-table {
    float: left;
    margin-right: 5px;
    width: 100%;
}
.tb-table span {
    font-size: 0.75em;
    padding: 2px;
}
.tb-list {
    border: 3px solid #666;
    height: 100px;
    background-color: #777;
    margin: 2px 0px 3px;
    padding: 1px;
    border-radius: 3px;
    box-shadow: 0px 0px 0px #999;
    /*overflow-y: auto;*/    /* perfectScrollbar applied */
}
.textbatch {
    background-color: #333;
    color: #FFF;
    border-radius: 3px;
    margin: 1px;
    padding: 1px 0px 1px 8px;
    cursor: move;
    min-height: 20px;
    display: inline-flex;
}
.textbatch.tb-title {
    padding-left: 0px;
}
.undo-textallocation {
    float: right;
    width: 12px;
    height: 12px;
    cursor: pointer;
    text-align: center;
    margin: 0px 6px;
}
.undo-textallocation span {
    vertical-align: text-top;
    color: #F00;
    font-size: 11px;
    font-weight: 600;
}

JavaScript

// Wys utils
wys = {
  utils : {}
};
    
wys.utils.getCStextbatches = function (sceneid, textbatches) {
    return ko.computed(function () {
        return ko.utils.arrayFilter(textbatches(), function (t) {
            return ko.utils.unwrapObservable(t.sceneID) === sceneid;   // sceneID is an observable for 'textbatch'!
        });
    });
};

Scene = function(data){
    var self = this;
    self.sceneID = data.sceneID;
    self.title = ko.observable(data.title);
    self.sequenceNo = ko.observable(data.sequenceNo);
    self.chapterNo = ko.observable(data.chapterNo);
};

Textbatch = function(data){
    var self = this;
    self.textbatchID = data.textbatchID;
    self.sceneID = ko.observable(data.sceneID);
    self.title = ko.observable(data.title);
    self.sequenceNo = ko.observable(data.sequenceNo);
    self.sequenceNoInProject = ko.observable(data.sequenceNoInProject);
};


ViewModel = function(myscenes,mytexts){
		var self = this;

    // scenes
    self.Scenes = ko.observableArray(
         ko.utils.arrayMap(myscenes, function (item) {
             return new Scene(item);
         }));
    self.selectedScene = ko.observable(self.Scenes()[0]);


    // textbatches
    self.Textbatches = ko.observableArray(
         ko.utils.arrayMap(mytexts, function (item) {
             return new Textbatch(item);
         }));
    self.selectedText = ko.observable();
    
   
    // texts to allocate
    self.allocationableTextbatches = ko.observableArray();

    ko.computed(function () {
        var notallocated = ko.utils.arrayFilter(self.Textbatches(), function (batch) {
            return batch.sceneID() === null;
        });
        self.allocationableTextbatches(notallocated); // could we do a read-write computable for this?
        // cannot use solely koFiltered as ko.sortable needs an array to write to.
    });

		// texts on scene
    self.getCStextbatches = function (scene) { return wys.utils.getCStextbatches(scene.sceneID, self.Textbatches) };
    
   ...