JavaScript DHTML/Ajax Layer/Image Drag Drop
Drag and drop images in a list
<source lang="html4strict">
<html><head>
<title>DragList - Javascript Drag and Drop Ordered Lists in Javascript</title>
<script language="JavaScript" type="text/javascript"> /**************************************************
* dom-drag.js * 09.25.2001 * www.youngpup.net ************************************************** * 10.28.2001 - fixed minor bug where events * sometimes fired off the handle, not the root. ************************************************** * 05.30.2005 - added a workaround for firefox * activating links when finished dragging. * mmosier@astrolabe.ru **************************************************/
var Drag = {
obj : null,
init : function(o, oRoot, minX, maxX, minY, maxY, bSwapHorzRef, bSwapVertRef, fXMapper, fYMapper)
{
o.onmousedown = Drag.start;
o.hmode = bSwapHorzRef ? false : true ;
o.vmode = bSwapVertRef ? false : true ;
o.root = oRoot && oRoot != null ? oRoot : o ;
if (o.hmode && isNaN(parseInt(o.root.style.left ))) o.root.style.left = "0px";
if (o.vmode && isNaN(parseInt(o.root.style.top ))) o.root.style.top = "0px";
if (!o.hmode && isNaN(parseInt(o.root.style.right ))) o.root.style.right = "0px";
if (!o.vmode && isNaN(parseInt(o.root.style.bottom))) o.root.style.bottom = "0px";
o.minX = typeof minX != "undefined" ? minX : null;
o.minY = typeof minY != "undefined" ? minY : null;
o.maxX = typeof maxX != "undefined" ? maxX : null;
o.maxY = typeof maxY != "undefined" ? maxY : null;
o.xMapper = fXMapper ? fXMapper : null;
o.yMapper = fYMapper ? fYMapper : null;
o.root.onDragStart = new Function();
o.root.onDragEnd = new Function();
o.root.onDrag = new Function();
},
start : function(e)
{
var o = Drag.obj = this;
e = Drag.fixE(e);
var y = parseInt(o.vmode ? o.root.style.top : o.root.style.bottom);
var x = parseInt(o.hmode ? o.root.style.left : o.root.style.right );
o.root.onDragStart(x, y);
o.startX = x;
o.startY = y;
o.lastMouseX = e.clientX;
o.lastMouseY = e.clientY;
if (o.hmode) {
if (o.minX != null) o.minMouseX = e.clientX - x + o.minX;
if (o.maxX != null) o.maxMouseX = o.minMouseX + o.maxX - o.minX;
} else {
if (o.minX != null) o.maxMouseX = -o.minX + e.clientX + x;
if (o.maxX != null) o.minMouseX = -o.maxX + e.clientX + x;
}
if (o.vmode) {
if (o.minY != null) o.minMouseY = e.clientY - y + o.minY;
if (o.maxY != null) o.maxMouseY = o.minMouseY + o.maxY - o.minY;
} else {
if (o.minY != null) o.maxMouseY = -o.minY + e.clientY + y;
if (o.maxY != null) o.minMouseY = -o.maxY + e.clientY + y;
}
document.onmousemove = Drag.drag;
document.onmouseup = Drag.end;
if (o.linkDisabled) {
var hrefs = o.root.getElementsByTagName("a");
for (var i = 0; i < hrefs.length; i++) {
hrefs[i].onclick = hrefs[i].prevOnclick;
hrefs[i].prevOnclick = null;
}
o.linkDisabled = false;
}
return false;
},
drag : function(e)
{
e = Drag.fixE(e);
var o = Drag.obj;
var ey = e.clientY;
var ex = e.clientX;
var y = parseInt(o.vmode ? o.root.style.top : o.root.style.bottom);
var x = parseInt(o.hmode ? o.root.style.left : o.root.style.right );
var nx, ny;
if (o.minX != null) ex = o.hmode ? Math.max(ex, o.minMouseX) : Math.min(ex, o.maxMouseX);
if (o.maxX != null) ex = o.hmode ? Math.min(ex, o.maxMouseX) : Math.max(ex, o.minMouseX);
if (o.minY != null) ey = o.vmode ? Math.max(ey, o.minMouseY) : Math.min(ey, o.maxMouseY);
if (o.maxY != null) ey = o.vmode ? Math.min(ey, o.maxMouseY) : Math.max(ey, o.minMouseY);
nx = x + ((ex - o.lastMouseX) * (o.hmode ? 1 : -1));
ny = y + ((ey - o.lastMouseY) * (o.vmode ? 1 : -1));
if (o.xMapper) nx = o.xMapper(y)
else if (o.yMapper) ny = o.yMapper(x)
Drag.obj.root.style[o.hmode ? "left" : "right"] = nx + "px";
Drag.obj.root.style[o.vmode ? "top" : "bottom"] = ny + "px";
Drag.obj.lastMouseX = ex;
Drag.obj.lastMouseY = ey;
var threshold = 4;
if (!o.linkDisabled) {
if (Math.abs(nx - o.startX) > threshold || Math.abs(ny - o.startY) > threshold) {
var hrefs = o.root.getElementsByTagName("a");
for (var i = 0; i < hrefs.length; i++) {
hrefs[i].prevOnclick = hrefs[i].onclick;
hrefs[i].onclick = function() { return false; };
}
o.linkDisabled = true;
}
}
Drag.obj.root.onDrag(nx, ny, Drag.obj.root);
return false;
},
end : function()
{
document.onmousemove = null;
document.onmouseup = null;
Drag.obj.root.onDragEnd( parseInt(Drag.obj.root.style[Drag.obj.hmode ? "left" : "right"]),
parseInt(Drag.obj.root.style[Drag.obj.vmode
? "top" : "bottom"]), Drag.obj.root);
Drag.obj = null;
},
fixE : function(e)
{
if (typeof e == "undefined") e = window.event;
if (typeof e.layerX == "undefined") e.layerX = e.offsetX;
if (typeof e.layerY == "undefined") e.layerY = e.offsetY;
return e;
}
}; </script>
<script language="JavaScript" type="text/javascript"> // ---------------------------------------------------------------------------- // (c) Copyright, DTLink, LLC 1997-2005 // http://www.dtlink.ru // // DragList - Drag and Drop Ordered Lists // // Javascript Support file for formVista <draglist> fvml tag. // // For more information please see: // // http://www.formvista.ru/otherprojects/draglist.html // // For questions or comments please contact us at: // // http://www.formvista.ru/contact.html // // LICENSE: This file is governed by the new BSD license. For more information // please see the LICENSE.txt file accompanying this package. // // REVISION HISTORY: // // 2004-11-12 YmL: // . initial revision. // // 2005-05-28 YmL: // . pulled out of formVista, relicensed and packaged as a standalone implementation. // // 2005-06-02 mtmosier: // . added horizontal dragging support. // // ------------------------ /**
- constructor for dragList class
- /
function fv_dragList( name )
{
// name of this dragList. Must match the id of the root DIV tag.
this.dragListRootId = name;
// array of item offsets
this.offsetsX = new Array();
this.offsetsY = new Array();
}
// ---------------------------------------------- /**
- setup the draglist prior to use
- @param string orientation defaults to vert. if set to "horz" renders horizontally.
- @param string itemTagName. if null defaults to "div". Can be "span".
- /
fv_dragList.prototype.setup = function( orientation, itemTagName )
{
var horizontal;
if ( orientation == "horz" )
horizontal = true;
else
horizontal = false;
this.listRoot = document.getElementById( this.dragListRootId );
this.listItems = this.getListItems( itemTagName );
for (var i = 0; i < this.listItems.length; i++)
{
if ( this.listItems[i] == undefined )
continue;
if ( horizontal )
{
Drag.init(this.listItems[i], null, null, null, 0, 0);
}
else
{
Drag.init(this.listItems[i], null, 0, 0, null, null);
}
// ---------------------------------------------------
// on drag method
this.listItems[i].onDrag = function( x, y, thisElem )
{
x = thisElem.offsetLeft;
y = thisElem.offsetTop;
// this is a callback from the dom-drag code. From within this
// function "this" does not refer to the fv_draglist function.
draglist = getDragList( thisElem );
draglist.recalcOffsets( itemTagName );
var pos = draglist.getCurrentOffset( thisElem, itemTagName );
//var listItems = this.getListItems( itemTagName );
// if bottom edge is below top of lower item.
var testMoveUp;
var testMoveDown;
if ( horizontal )
{
testMoveUp = (x + draglist.getDivWidth(thisElem) > draglist.offsetsX[pos + 1] + draglist.getDivWidth( draglist.listItems[pos + 1] ));
testMoveDown = x < draglist.offsetsX[pos - 1];
}
else
{
testMoveUp = (y + draglist.getDivHeight(thisElem) > draglist.offsetsY[pos + 1] + draglist.getDivHeight( draglist.listItems[pos + 1] ));
testMoveDown = y < draglist.offsetsY[pos - 1];
}
if (( pos != draglist.listItems.length - 1) && testMoveUp )
{
draglist.listRoot.removeChild(thisElem);
if ( pos + 1 == draglist.listItems.length )
{
draglist.listRoot.appendChild( thisElem );
}
else
{
draglist.listRoot.insertBefore(thisElem, draglist.listItems[pos+1]);
}
thisElem.style["top"] = "0px";
thisElem.style["left"] = "0px";
}
else if ( pos != 0 && testMoveDown )
{
draglist.listRoot.removeChild(thisElem);
draglist.listRoot.insertBefore(thisElem, draglist.listItems[pos-1]);
thisElem.style["top"] = "0px";
thisElem.style["left"] = "0px";
}
};
this.listItems[i].onDragEnd = function(x,y,thisElem)
{
thisElem.style["top"] = "0px";
thisElem.style["left"] = "0px";
}
} // end of for loop.
this.recalcOffsets( itemTagName );
} // end of setup.
// ----------------------------------------------
/**
- update the order value fields and submit the form.
- /
fv_dragList.prototype.do_submit = function( formName, dragListRootId )
{
var listOrderItems = this.listRoot.getElementsByTagName("input");
for (var i = 0; i < listOrderItems.length; i++)
{
listOrderItems[i].value = i;
}
expr = "document." + formName + ".submit()";
eval( expr );
}
// ---------------------------------------------- // "Private" methods. // ---------------------------------------------- fv_dragList.prototype.recalcOffsets = function( itemTagName )
{
var listItems = this.getListItems( itemTagName );
for (var i = 0; i < listItems.length; i++)
{
this.offsetsX[i] = listItems[i].offsetLeft;
this.offsetsY[i] = listItems[i].offsetTop;
}
}
fv_dragList.prototype.getCurrentOffset = function(elem, itemTagName)
{
var listItems = this.getListItems( itemTagName );
for (var i = 0; i < listItems.length; i++)
{
if (listItems[i] == elem)
{
return i;
}
}
}
fv_dragList.prototype.getDivWidth = function(elem)
{
if (( elem == undefined) || ( elem.offsetWidth == undefined ))
return( 0 );
value = elem.offsetWidth;
if (isNaN(value))
{
value = 0;
}
return( value );
}
fv_dragList.prototype.getDivHeight = function(elem)
{
if (( elem == undefined) || ( elem.offsetHeight == undefined ))
return( 0 );
value = elem.offsetHeight;
if (isNaN(value))
{
value = 25;
}
return( value );
}
/**
- return list of draggable items
- /
fv_dragList.prototype.getListItems = function( itemTagName )
{
if ( itemTagName == undefined )
{
itemTagName = "div";
}
var listItems = this.listRoot.getElementsByTagName( itemTagName );
return( listItems );
}
// end of draglist class definition. // ------------------------------------- /**
- add a new dragList to the list of draglists on this page
- This implementatoin supports multiple managed draglists on
- a single page. The index is contained in a global dragListIndex
- array that must be declared in the page.
- /
function addDragList( draglist )
{
dragListIndex[ draglist.dragListRootId ] = draglist;
}
// ------------------------------------------------------- /**
- given a draggable div element, return the draglist it belongs to
- @see fv_draglist.prototype.setup
- @todo this should probably be a method inside the draglist class.
- /
function getDragList( elem )
{
// given a list item return the drag list it belongs to.
var draglistContainer = elem.parentNode;
var draglist = dragListIndex[ draglistContainer.id ];
return( draglist );
}
// END </script> </head> <body leftmargin="0" topmargin="0" bgcolor="#ffffff" marginheight="0" marginwidth="0">
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draglist - Drag and Drop Ordered Lists in Javascript |
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This is a demonstration of the draglist Drag and Drop Ordered list implementation used
in the <a href="http://www.formVista.ru">formVista</a> business component framework
by <a href="http://www.dtlink.ru">DTLink Software</a>.
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Logos for AnswerTool, NeoPhoto, PersonalStockStreamer and formVista are trademarks of DTLink, LLC.
<a href="http://www.formvista.ru/otherprojects/draglist.html">Back to Drag List Page</a>
<script language="JavaScript"> // a bit ugly. draglist.js assumes the existence of a global // dragListIndex array. var dragListIndex = new Array(); // manager classes. draglist_manager = new fv_dragList( "draglist_container" ); draglist_manager_horz = new fv_dragList( "draglist_container_horz" ); // queries all top level <divs> under the draglist_container // div and sets up dragging. draglist_manager.setup(); // queries all top level "s under the draglist_container_horz // div and sets up horizontal dragging. draglist_manager_horz.setup( "horz", "span"); // addes the newly created dragList to the list of draglists on // the page (i.e. we can have more than one on a page) addDragList( draglist_manager ); addDragList( draglist_manager_horz ); </script>
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