Ciao a tutti,
ho un piccolo (per me immenso) problema con un drag & drop che ho utilizzato.
Per prima cosa premetto che ho utilizzato il seguente script:
dragDrop = {
keyHTML: '<a href="#" class="keyLink">#</a>',
keySpeed: 10, // pixels per keypress event
initialMouseX: undefined,
initialMouseY: undefined,
startX: undefined,
startY: undefined,
dXKeys: undefined,
dYKeys: undefined,
draggedObject: undefined,
initElement: function (element) {
if (typeof element == 'string')
element = document.getElementById(element);
element.onmousedown = dragDrop.startDragMouse;
element.innerHTML += dragDrop.keyHTML;
var links = element.getElementsByTagName('a');
var lastLink = links[links.length-1];
lastLink.relatedElement = element;
lastLink.onclick = dragDrop.startDragKeys;
},
startDragMouse: function (e) {
dragDrop.startDrag(this);
var evt = e || window.event;
dragDrop.initialMouseX = evt.clientX;
dragDrop.initialMouseY = evt.clientY;
addEventSimple(document,'mousemove',dragDrop.dragMouse);
addEventSimple(document,'mouseup',dragDrop.releaseElement);
return false;
},
startDragKeys: function () {
dragDrop.startDrag(this.relatedElement);
dragDrop.dXKeys = dragDrop.dYKeys = 0;
addEventSimple(document,'keydown',dragDrop.dragKeys);
addEventSimple(document,'keypress',dragDrop.switchKeyEvents);
this.blur();
return false;
},
startDrag: function (obj) {
if (dragDrop.draggedObject)
dragDrop.releaseElement();
dragDrop.startX = obj.offsetLeft;
dragDrop.startY = obj.offsetTop;
dragDrop.draggedObject = obj;
obj.className += ' dragged';
},
dragMouse: function (e) {
var evt = e || window.event;
var dX = evt.clientX - dragDrop.initialMouseX;
var dY = evt.clientY - dragDrop.initialMouseY;
dragDrop.setPosition(dX,dY);
return false;
},
dragKeys: function(e) {
var evt = e || window.event;
var key = evt.keyCode;
switch (key) {
case 37: // left
case 63234:
dragDrop.dXKeys -= dragDrop.keySpeed;
break;
case 38: // up
case 63232:
dragDrop.dYKeys -= dragDrop.keySpeed;
break;
case 39: // right
case 63235:
dragDrop.dXKeys += dragDrop.keySpeed;
break;
case 40: // down
case 63233:
dragDrop.dYKeys += dragDrop.keySpeed;
break;
case 13: // enter
case 27: // escape
dragDrop.releaseElement();
return false;
default:
return true;
}
dragDrop.setPosition(dragDrop.dXKeys,dragDrop.dYKeys);
if (evt.preventDefault)
evt.preventDefault();
return false;
},
setPosition: function (dx,dy) {
dragDrop.draggedObject.style.left = dragDrop.startX + dx + 'px';
dragDrop.draggedObject.style.top = dragDrop.startY + dy + 'px';
},
switchKeyEvents: function () {
// for Opera and Safari 1.3
removeEventSimple(document,'keydown',dragDrop.dragKeys);
removeEventSimple(document,'keypress',dragDrop.switchKeyEvents);
addEventSimple(document,'keypress',dragDrop.dragKeys);
},
releaseElement: function() {
removeEventSimple(document,'mousemove',dragDrop.dragMouse);
removeEventSimple(document,'mouseup',dragDrop.releaseElement);
removeEventSimple(document,'keypress',dragDrop.dragKeys);
removeEventSimple(document,'keypress',dragDrop.switchKeyEvents);
removeEventSimple(document,'keydown',dragDrop.dragKeys);
dragDrop.draggedObject.className = dragDrop.draggedObject.className.replace(/dragged/,'');
dragDrop.draggedObject = null;
}
}
che funziona perfettamente, ma mi crea un piccolo problema.
Devo attivare un div a seguito di un click del mouse su un punto preciso della pagina, e fin qui tutto bene. Il problema si pone quando, rilasciando il bottone del mouse, l'oggetto continua ad essere trascinato in qualsiasi punto del div io tenga premuto.
Riassumendo, dovrei semplicemente "eliminare" il trascinamento al rilascio del mouse, o al mouseout... solo che non ci riesco!
Grazie mille a chi mi saprà aiutare!!!
