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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<title>Reordering a List</title>
<style type="text/css">
/*margin and padding on body element
can introduce errors in determining
element position and are not recommended;
we turn them off as a foundation for YUI
CSS treatments. */
body {
margin:0;
padding:0;
}
</style>
<link rel="stylesheet" type="text/css" href="../../build/fonts/fonts-min.css" />
<script type="text/javascript" src="../../build/yahoo-dom-event/yahoo-dom-event.js"></script>
<script type="text/javascript" src="../../build/animation/animation-min.js"></script>
<script type="text/javascript" src="../../build/dragdrop/dragdrop-min.js"></script>
<!--begin custom header content for this example-->
<style type="text/css">
div.workarea { padding:10px; float:left }
ul.draglist {
position: relative;
width: 200px;
height:240px;
background: #f7f7f7;
border: 1px solid gray;
list-style: none;
margin:0;
padding:0;
}
ul.draglist li {
margin: 1px;
cursor: move;
zoom: 1;
}
ul.draglist_alt {
position: relative;
width: 200px;
list-style: none;
margin:0;
padding:0;
/*
The bottom padding provides the cushion that makes the empty
list targetable. Alternatively, we could leave the padding
off by default, adding it when we detect that the list is empty.
*/
padding-bottom:20px;
}
ul.draglist_alt li {
margin: 1px;
cursor: move;
}
li.list1 {
background-color: #D1E6EC;
border:1px solid #7EA6B2;
}
li.list2 {
background-color: #D8D4E2;
border:1px solid #6B4C86;
}
#user_actions { float: right; }
</style>
<!--end custom header content for this example-->
</head>
<body class="yui-skin-sam">
<h1>Reordering a List</h1>
<div class="exampleIntro">
<p>This example demonstrates how to create a list that can have the order changed with the <a href="http://developer.yahoo.com/yui/dragdrop/">Drag & Drop Utility</a>.</p>
</div>
<!--BEGIN SOURCE CODE FOR EXAMPLE =============================== -->
<div class="workarea">
<h3>List 1</h3>
<ul id="ul1" class="draglist">
<li class="list1" id="li1_1">list 1, item 1</li>
<li class="list1" id="li1_2">list 1, item 2</li>
<li class="list1" id="li1_3">list 1, item 3</li>
</ul>
</div>
<div class="workarea">
<h3>List 2</h3>
<ul id="ul2" class="draglist">
<li class="list2" id="li2_1">list 2, item 1</li>
<li class="list2" id="li2_2">list 2, item 2</li>
<li class="list2" id="li2_3">list 2, item 3</li>
</ul>
</div>
<div id="user_actions">
<input type="button" id="showButton" value="Show Current Order" />
<input type="button" id="switchButton" value="Remove List Background" />
</div>
<script type="text/javascript">
(function() {
var Dom = YAHOO.util.Dom;
var Event = YAHOO.util.Event;
var DDM = YAHOO.util.DragDropMgr;
//////////////////////////////////////////////////////////////////////////////
// example app
//////////////////////////////////////////////////////////////////////////////
YAHOO.example.DDApp = {
init: function() {
var rows=3,cols=2,i,j;
for (i=1;i<cols+1;i=i+1) {
new YAHOO.util.DDTarget("ul"+i);
}
for (i=1;i<cols+1;i=i+1) {
for (j=1;j<rows+1;j=j+1) {
new YAHOO.example.DDList("li" + i + "_" + j);
}
}
Event.on("showButton", "click", this.showOrder);
Event.on("switchButton", "click", this.switchStyles);
},
showOrder: function() {
var parseList = function(ul, title) {
var items = ul.getElementsByTagName("li");
var out = title + ": ";
for (i=0;i<items.length;i=i+1) {
out += items[i].id + " ";
}
return out;
};
var ul1=Dom.get("ul1"), ul2=Dom.get("ul2");
alert(parseList(ul1, "List 1") + "\n" + parseList(ul2, "List 2"));
},
switchStyles: function() {
Dom.get("ul1").className = "draglist_alt";
Dom.get("ul2").className = "draglist_alt";
}
};
//////////////////////////////////////////////////////////////////////////////
// custom drag and drop implementation
//////////////////////////////////////////////////////////////////////////////
YAHOO.example.DDList = function(id, sGroup, config) {
YAHOO.example.DDList.superclass.constructor.call(this, id, sGroup, config);
this.logger = this.logger || YAHOO;
var el = this.getDragEl();
Dom.setStyle(el, "opacity", 0.67); // The proxy is slightly transparent
this.goingUp = false;
this.lastY = 0;
};
YAHOO.extend(YAHOO.example.DDList, YAHOO.util.DDProxy, {
startDrag: function(x, y) {
this.logger.log(this.id + " startDrag");
// make the proxy look like the source element
var dragEl = this.getDragEl();
var clickEl = this.getEl();
Dom.setStyle(clickEl, "visibility", "hidden");
dragEl.innerHTML = clickEl.innerHTML;
Dom.setStyle(dragEl, "color", Dom.getStyle(clickEl, "color"));
Dom.setStyle(dragEl, "backgroundColor", Dom.getStyle(clickEl, "backgroundColor"));
Dom.setStyle(dragEl, "border", "2px solid gray");
},
endDrag: function(e) {
var srcEl = this.getEl();
var proxy = this.getDragEl();
// Show the proxy element and animate it to the src element's location
Dom.setStyle(proxy, "visibility", "");
var a = new YAHOO.util.Motion(
proxy, {
points: {
to: Dom.getXY(srcEl)
}
},
0.2,
YAHOO.util.Easing.easeOut
);
var proxyid = proxy.id;
var thisid = this.id;
// Hide the proxy and show the source element when finished with the animation
a.onComplete.subscribe(function() {
Dom.setStyle(proxyid, "visibility", "hidden");
Dom.setStyle(thisid, "visibility", "");
});
a.animate();
},
onDragDrop: function(e, id) {
// If there is one drop interaction, the li was dropped either on the list,
// or it was dropped on the current location of the source element.
if (DDM.interactionInfo.drop.length === 1) {
// The position of the cursor at the time of the drop (YAHOO.util.Point)
var pt = DDM.interactionInfo.point;
// The region occupied by the source element at the time of the drop
var region = DDM.interactionInfo.sourceRegion;
// Check to see if we are over the source element's location. We will
// append to the bottom of the list once we are sure it was a drop in
// the negative space (the area of the list without any list items)
if (!region.intersect(pt)) {
var destEl = Dom.get(id);
var destDD = DDM.getDDById(id);
destEl.appendChild(this.getEl());
destDD.isEmpty = false;
DDM.refreshCache();
}
}
},
onDrag: function(e) {
// Keep track of the direction of the drag for use during onDragOver
var y = Event.getPageY(e);
if (y < this.lastY) {
this.goingUp = true;
} else if (y > this.lastY) {
this.goingUp = false;
}
this.lastY = y;
},
onDragOver: function(e, id) {
var srcEl = this.getEl();
var destEl = Dom.get(id);
// We are only concerned with list items, we ignore the dragover
// notifications for the list.
if (destEl.nodeName.toLowerCase() == "li") {
var orig_p = srcEl.parentNode;
var p = destEl.parentNode;
if (this.goingUp) {
p.insertBefore(srcEl, destEl); // insert above
} else {
p.insertBefore(srcEl, destEl.nextSibling); // insert below
}
DDM.refreshCache();
}
}
});
Event.onDOMReady(YAHOO.example.DDApp.init, YAHOO.example.DDApp, true);
})();
</script>
<!--END SOURCE CODE FOR EXAMPLE =============================== -->
</body>
</html>
|
