<div class="intro">
<p>This example shows a simple drag interaction that doesn't require a drop interaction.</p>
</div>
<div class="example">
{{>groups-drag-source}}
</div>
<h3>Setting up the Work Area</h3>
<p>First we need to create the work area, players (drags) and slots (drops).</p>
```
{{>groups-drag-source-html}}
```
<p>Now we give them some CSS to make them visible.</p>
```
{{>groups-drag-source-css}}
```
<h4>Setting up the YUI Instance</h4>
<p>Now we need to create our YUI instance and tell it to load the `dd-drop`, `dd-proxy` and `dd-constrain` modules.</p>
```
YUI().use('dd-drop', 'dd-proxy', 'dd-constrain');
```
<h4>Setting up the Drop Targets</h4>
<p>Now that we have a YUI instance with the requested modules, we are going to create our Drop Targets.</p>
```
YUI().use('dd-drop', 'dd-proxy', 'dd-constrain', function(Y) {
//Get all the nodes with the class of .slot under #workarea
var slots = Y.one('#workarea').all('.slot');
//Loop through them
Y.each(slots, function(v, k) {
var id = v.get('id'), groups = ['two'];
//Assign them to different groups
switch (id) {
case 't1':
case 't2':
groups = ['one'];
break;
}
//Create the Drop object
var drop = new Y.DD.Drop({
node: v,
//With the new groups array as a config option
groups: groups
});
});
});
```
<h4>Setting up the Drag Nodes</h4>
<p>Now we need to create the Drag Nodes and assign them to the proper group.</p>
```
YUI().use('dd-drop', 'dd-proxy', 'dd-constrain', function(Y) {
//Snipped
var players = Y.one('#workarea').all('.player');
Y.each(players, function(v, k) {
var id = v.get('id'), groups = ['one', 'two'];
switch (id) {
case 'pt1':
case 'pt2':
groups = ['one'];
break;
case 'pb1':
case 'pb2':
groups = ['two'];
break;
}
var drag = new Y.DD.Drag({
node: v,
//Assign the Groups
groups: groups,
//Use Intersect Mode for the Target Calculations
dragMode: 'intersect',
}).plug(Y.Plugin.DDProxy, {
//We don't want the node to move on end drag
moveOnEnd: false
}).plug(Y.Plugin.DDConstrained, {
//Keep me inside the workarea
constrain2node: '#workarea'
});
});
```
<h4>Handling the Drops and Moments</h4>
<p>Now we are going to listen for the following Drag Events: `drag:start, drag:end, drag:drophit, drag:dropmiss`</p>
```
drag.on('drag:start', function() {
//In this event we setup some styles to make the nodes look pretty
var p = this.get('dragNode'),
n = this.get('node');
n.setStyle('opacity', .25);
if (!this._playerStart) {
this._playerStart = this.nodeXY;
}
//Put the Drag's HTML inside the proxy
//set some styles on the proxy
backgroundColor: n.getStyle('backgroundColor'),
color: n.getStyle('color'),
opacity: .65
});
});
drag.on('drag:end', function() {
//Undo some of the styles from the start
var n = this.get('node');
n.setStyle('opacity', '1');
});
drag.on('drag:drophit', function(e) {
//If we drop on a target, move to its position
var xy = e.drop.get('node').getXY();
this.get('node').setXY(xy);
});
drag.on('drag:dropmiss', function(e) {
//If we miss a target, move back to our start position
if (this._playerStart) {
this.get('node').setXY(this._playerStart);
this._playerStart = null;
}
});
```
<h4>Full Javascript Code</h4>
```
{{>groups-drag-source-js}}
```