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HTML5 drag and drop demonstration in an XPage
MarkyRoden    

I saw an article on HTML5 drag and drop and wondered how hard it would be in XPages.

Demonstration

Here is a link to the working demo of HTML5 drag and drop in an XPage – this is FF and Chrome only as drag/drop is not supported until IE10

How does it work?

I created an XPage and added a simple data table

Data Table

XPages Data Table

 

Going off the text in the article I tried to add the events to the Fruit label column – unfortunately you cannot add custom attributes to an xp:text

Cannot add custom attributes to an <xp:text

Cannot add custom attributes to an <xp:text

 

So once again – back to using dojo selectors to get what we want.

The HTML generated by the XPage creates all the fruit labels (Oranges, Bananas, Apples) with an id=blah:_1blah ending in “someFruit”

<tr><td class="xspColumn"><span id="view:_id1:_id2:_id31:viewPanel1:0:column3:someFruit" class="xspTextComputedField">Oranges</span></td>
<td class="xspColumn"><span id="view:_id1:_id2:_id31:viewPanel1:0:column1:computedField2" class="xspTextComputedField">2.0</span></td>
<td class="xspColumn"><span id="view:_id1:_id2:_id31:viewPanel1:0:column2:computedField3" class="xspTextComputedField">4</span></td>
</tr>
<tr><td class="xspColumn"><span id="view:_id1:_id2:_id31:viewPanel1:1:column3:someFruit" class="xspTextComputedField">Bananas</span></td>
<td class="xspColumn"><span id="view:_id1:_id2:_id31:viewPanel1:1:column1:computedField2" class="xspTextComputedField">1.0</span></td>
<td class="xspColumn"><span id="view:_id1:_id2:_id31:viewPanel1:1:column2:computedField3" class="xspTextComputedField">2</span></td>
</tr>

We can get a handle on these labels using dojo.query(“[id$=someFruit]“) which will get all elements with an id attribute ending in “someFruit”

Once we have all of those elements we can add a draggable and ondragstart attribute to them easily using dojo.attr

			dojo.query("[id$=someFruit]").forEach( function(node){
				 dojo.attr(node, "draggable", "true");
				 dojo.attr(node, "ondragstart", "dragIt(event);");
			});

Then we just need somewhere to drop them…
I added the same DIV elements from the example to the XPage

				<xp:td>
					<div id="place1" ondrop="dropIt(event);"
						ondragover="event.preventDefault();">
					</div>
				</xp:td>
				<xp:td>
					<div id="place2" ondrop="dropIt(event, true);"
						ondragover="event.preventDefault();">
					</div>
				</xp:td>

and added the javascript functions to a scriptblock at the bottom of the page

	//function called when drag starts
		function dragIt(theEvent) {
			//tell the browser what to drag
			theEvent.dataTransfer.setData("Text", theEvent.target.id);
		}

		//function called when element drops
		function dropIt(theEvent, keepMe) {
			//get a reference to the element being dragged
			var theData = theEvent.dataTransfer.getData("Text");
			//get the element
			var theDraggedElement = document.getElementById(theData);

			//add it to the drop element
			if (keepMe){
				//Add a clone of the element to the field - rather than move it
				var newObj=dojo.clone(theDraggedElement)
				theEvent.target.appendChild(newObj);
			} else {
				theEvent.target.appendChild(theDraggedElement);
			}
			//Add a new line for visual line up
			var theBR=document.createElement("br")
			theEvent.target.appendChild(theBR);
			//instruct the browser to allow the drop
			theEvent.preventDefault();
		}

I changed the example slightly to add a clone capability rather than just drag and drop

Drag and Drop example 1

Drag and Drop example 1 (Move)

 

Dragging to the first box “moves” the label

Drag and Drop example 2 (Clone)

Drag and Drop example 2 (Clone)

 

Dragging the label to the second box create a copy of it using dojo.clone(node)

Conclusion

This is merely a prototype but demonstrates nicely the new and exiting capabilities of HTML5 without having the need for a dojo or jQuery library to do the drag/drop for you

Demonstration (again)

Here is a link to the working demo of HTML5 drag and drop in an XPage

 




---------------------
http://xomino.com/2012/03/27/html5-drag-and-drop-demonstration-in-an-xpage/
Mar 27, 2012
100 hits



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