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View Full Version : Limiting drop zone to one image



funkysoulbrotha
05-21-2012, 11:19 PM
Hi I am wondering how I would limit the drop zones to just one image per drop zone?



<ul id="images">
<li><a id="1" draggable="true"><img src="images/1.jpg" value = "flower"></a></li>
<li><a id="2" draggable="true"><img src="images/2.jpg" value = "boy"></a></li>
<li><a id="3" draggable="true"><img src="images/3.jpg" value = "girl"></a></li>
</ul>

<form name = "objects" id="form" action = "form.php" method = "post">

<div class="drop_zones">
<div class="drop_zone" id="drop_zone1" droppable="true" type = "text" name = "drop_zone1">
</div>

<div class="drop_zone" id="drop_zone2" droppable="true" type = "text" name = "drop_zone2">
</div>

<div class="drop_zone" id="drop_zone3" droppable="true" type = "text" type = "file" name = "drop_zone3">
</div>
</div>




var addEvent = (function () {
if (document.addEventListener) {
return function (el, type, fn) {
if (el && el.nodeName || el === window) {
el.addEventListener(type, fn, false);
} else if (el && el.length) {
for (var i = 0; i < el.length; i++) {
addEvent(el[i], type, fn);
}
}
};
} else {
return function (el, type, fn) {
if (el && el.nodeName || el === window) {
el.attachEvent('on' + type, function () { return fn.call(el, window.event); });
} else if (el && el.length) {
for (var i = 0; i < el.length; i++) {
addEvent(el[i], type, fn);
}
}
};
}
})();


var dragItems;
updateDataTransfer();
var dropAreas = document.querySelectorAll('[droppable=true]');


function cancel(e) {
if (e.preventDefault) {
e.preventDefault();
}
return false;
}


function updateDataTransfer() {
dragItems = document.querySelectorAll('[draggable=true]');
for (var i = 0; i < dragItems.length; i++) {
addEvent(dragItems[i], 'dragstart', function (event) {
event.dataTransfer.setData('obj_id', this.id);
return false;
});
}
}


addEvent(dropAreas, 'dragover', function (event) {
if (event.preventDefault) event.preventDefault();


this.style.borderColor = "#000";
return false;
});


addEvent(dropAreas, 'dragleave', function (event) {
if (event.preventDefault) event.preventDefault();


this.style.borderColor = "#ccc";
return false;
});


addEvent(dropAreas, 'dragenter', cancel);

// drop event handler
addEvent(dropAreas, 'drop', function (event) {
if (event.preventDefault) event.preventDefault();

// get dropped object
var iObj = event.dataTransfer.getData('obj_id');
var oldObj = document.getElementById(iObj);

// get its image src
var oldSrc = oldObj.childNodes[0].src;
oldObj.className += 'hidden';

var oldThis = this;

setTimeout(function() {
oldObj.parentNode.removeChild(oldObj); // remove object from DOM

// add similar object in another place
oldThis.innerHTML += '<a id="'+iObj+'" draggable="true"><img src="'+oldSrc+'" /> </a>';

// and update event handlers
updateDataTransfer();

// little customization
oldThis.style.borderColor = "#ccc";
}, 500);

return false;
});

Anyone know?

funkysoulbrotha
05-23-2012, 03:21 PM
Anyone have any idea please?:)

vwphillips
05-23-2012, 05:38 PM
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">

<head>
<title></title>
<style type="text/css">
/*<![CDATA[*/
.draggable {
width:100px;
}

.drop_zone {
width:200px;height:200px;border:solid red 1px;float:left
}

/*]]>*/
</style>

</head>

<body>

<ul id="images">
<li><a ><img class="draggable" src="http://www.vicsjavascripts.org.uk/StdImages/Egypt5.jpg" title = "flower"></a></li>
<li><a><img class="draggable" src="http://www.vicsjavascripts.org.uk/StdImages/Egypt6.jpg" title = "flower"></a></li>
<li><a><img class="draggable" src="http://www.vicsjavascripts.org.uk/StdImages/Egypt7.jpg" title = "flower"></a></li>
</ul>


<div class="drop_zones">
<div class="drop_zone" id="drop_zone1">
</div>

<div class="drop_zone" id="drop_zone2">
</div>

<div class="drop_zone" id="drop_zone3">
</div>
</div>

<script type="text/javascript">
/*<![CDATA[*/
// Drag Dock (23-May-2012)
// by Vic Phillips http://www.vicsjavascripts.org.uk/


var zxcDragDock={

init:function(o){
var drag=this.bycls(o.DragClass,document),docks=this.bycls(o.DockClass,document),obj,z0=0
obj={
docks:docks
}
for (;z0<drag.length;z0++){
this.addevt(drag[z0],'mousedown','down',obj,drag[z0]);
}
this.addevt(document,'mousemove','move',obj);
this.addevt(document,'mouseup','up',obj);
},

down:function(e,o,img){
var p=this.pos(img);
o.drag=document.createElement('IMG');
o.drag.src=img.src;
o.drag.style.position='absolute';
o.drag.style.zIndex='101';
o.drag.style.left=p[0]+'px';
o.drag.style.top=p[1]+'px';
o.drag.style.width=img.width+'px';
o.drag.style.height=img.height+'px';
document.body.appendChild(o.drag);
o.mse=[e.clientX,e.clientY];
this.rtn(e);
},

move:function(e,o){
if (o.drag){
var mse=[e.clientX,e.clientY];
o.drag.style.left=parseInt(o.drag.style.left)+mse[0]-o.mse[0]+'px';
o.drag.style.top=parseInt(o.drag.style.top)+mse[1]-o.mse[1]+'px';
o.mse=mse;
this.rtn(e);
}
},

up:function(e,o){
if (o.drag){
var lft=parseInt(o.drag.style.left),top=parseInt(o.drag.style.top),p,z0=0;
for (;z0<o.docks.length;z0++){
p=this.pos(o.docks[z0]);
if (!o.docks[z0].getElementsByTagName('IMG')[0]&&lft>p[0]&&lft+o.drag.width<p[0]+o.docks[z0].offsetWidth&&top>p[1]&&top+o.drag.height<p[1]+o.docks[z0].offsetHeight){
o.drag.style.position='static';
o.docks[z0].appendChild(o.drag);
o.drag=false;
return;
}
}
document.body.removeChild(o.drag);
o.drag=false;
this.rtn(e);
}
},

rtn:function(e){
if(e.stopPropagation){
e.stopPropagation();
}
if (!window.event){
e.preventDefault();
}
e.cancelBubble=true;
e.cancel=true;
e.returnValue=false;
return false;
},

pos:function(obj){
var rtn=[0,0];
while(obj){
rtn[0]+=obj.offsetLeft;
rtn[1]+=obj.offsetTop;
obj=obj.offsetParent;
}
return rtn;
},

addevt:function(o,t,f,p,p1){
var oop=this;
if (o.addEventListener) o.addEventListener(t,function(e){ return oop[f](e,p,p1);}, false);
else if (o.attachEvent) o.attachEvent('on'+t,function(e){ return oop[f](e,p,p1); });
},

bycls:function (nme,el){
for (var reg=new RegExp('\\b'+nme+'\\b'),els=el.getElementsByTagName('*'),ary=[],z0=0; z0<els.length;z0++){
if(reg.test(els[z0].className)){
ary.push(els[z0]);
}
}
return ary;
}

}

zxcDragDock.init({
DragClass:'draggable',
DockClass:'drop_zone'
});

/*]]>*/
</script>

</body>

</html>



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