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Building `Drag-and-Drop` DIVs: Polishing the Look and Feel


This is the last tutorial of the series “Building drag-and-drop DIVs.” Welcome back. In three parts, this series introduces the key points for creating dragging DIV elements, for quick inclusion in web pages, emulating the behavior of many user interfaces found in current desktop applications.

Author Info:
By: Alejandro Gervasio
Rating: 5 stars5 stars5 stars5 stars5 stars / 15
December 21, 2005
TABLE OF CONTENTS:
  1. · Building `Drag-and-Drop` DIVs: Polishing the Look and Feel
  2. · Adding elements on the fly: building DIV elements with the DOM
  3. · Nesting and styling DIV elements: defining the “DOMWindow()” function
  4. · Turning DOM-based DIVS into dragging elements: using the X library
  5. · Putting the pieces together: listing the full code for DOM-based dragging DIVs

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Building `Drag-and-Drop` DIVs: Polishing the Look and Feel - Putting the pieces together: listing the full code for DOM-based dragging DIVs
(Page 5 of 5 )

To summarize, here’s the full source code for building DOM-based dragging DIV elements:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>DRAG-AND-DROP DOM-BASED WINDOWS</title>
<script type="text/javascript" src="path-to-
library/x_core.js"></script>
<script type="text/javascript" src="path-to-
library/x_event.js"></script>
<script type="text/javascript" src="path-to-
library/x_drag.js"></script>
<script type="text/javascript">
// create div element
function DOMDiv(x,y,w,h,col){
 var div=document.createElement('div');
   div.style.position='absolute';
   div.style.left=x+'px';
   div.style.top=y+'px';
   div.style.width=w+'px';
   div.style.height=h+'px';
   div.style.backgroundColor=col;
   div.style.padding='0';
   return div
}
// create DOM window
function DOMWindow(x,y,w,h,title,content){
 // create window structure
 var winBody=new DOMDiv(x,y,w,h,'#ccc');
 // assign ID attribute
 winBody.setAttribute('id','domdiv');
 winBody.style.border='2px outset #aaa';
 winBody.style.cursor='default';
 // create window title bar
 var titleBar=new DOMDiv(4,4,w-14,18,'#00c');
 titleBar.style.font='bold 10pt Arial';
 titleBar.style.color='#fff';
 titleBar.style.paddingLeft='4px';
 // create window 'content area'
 var contentArea=new DOMDiv(4,26,w-10,h-40,'#fff');
 contentArea.style.width=document.all?(parseInt
(contentArea.style.width)-4)+'px':(parseInt
(contentArea.style.width)-7)+'px';
 contentArea.style.border='1px inset #ccc';
 contentArea.style.overflow='auto';
 contentArea.style.padding='0px 2px 0px 4px';
 contentArea.style.font='normal 10pt Arial';
 // append title to title bar
   titleBar.appendChild(document.createTextNode(title));
 // append text to content area
 contentArea.appendChild(document.createTextNode(content));
 // append title bar
 winBody.appendChild(titleBar);
 // append content area
   winBody.appendChild(contentArea);
 // append window to document tree
 document.getElementsByTagName('body')[0].appendChild(winBody);
}
// create 'domdiv' element and assign events
function initDomDiv(){
 var domdiv=xGetElementById('domdiv');
   xMoveTo(domdiv,100,100);
   xEnableDrag(domdiv,domdivOnDragStart,domdivOnDrag);
   xShow(domdiv);
}
function domdivOnDragStart(){}
// move 'domdiv' element
function domdivOnDrag(ele,mdx,mdy){
   xMoveTo(ele,xLeft(ele)+mdx,xTop(ele)+mdy);
}
// display drag-and-drop div when page is loaded
window.onload=function(){
 if(document.createElement&&document.
getElementById&&document.getElementsByTagName){
  // display 'domdiv'
     domWin=new DOMWindow(100,100,250,200,'Drag-and-drop DOM
Div','This dragging DIV element has been created with the DOM.');
  // make 'domdiv' a dragging element
  initDomDiv();
 }
}
</script>
</head>
<body>
</body>
</html>

Bottom line

Before I wrap up this tutorial, a final note: the example I wrote earlier uses presentational JavaScript for styling each dragging DIV element, something that was discussed at the beginning of the article. However, you may want to utilize a CSS-based approach, in order to make your design stick a little closer to Web standards. The result will be nearly identical.

Now, it’s time to say goodbye. In this three-part series, I progressively went through the process for building drag-and-drop DIVs, ranging from writing a rather basic script to coding an advanced approach, by using the robust X library that  Michael Foster allowed me to include in the corresponding examples. Thus, you have the knowledge and the tools for spicing up your web-based user interfaces utilizing true drag-and-drop DIVs. Wait are you waiting for? Go for it!


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