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COMPATABILITY: Tested successfully with IE 6.x, Netscape 6.2, 7.x, and
Mozilla 1.3. Since this script uses IFRAME objects and DHTML heavily,
cross-browser compatability is a goal but there may be some quirks in
various browser versions.
USAGE:
1) Include the source file in your main document which contains the IFRAME
tags. Make sure each iframe has a unique "ID" attribute. For best browser
compatability, also include a "NAME" attribute in the IFRAME tag that
has the same value as the "ID" attribute.
2) In the document content of each IFRAME which will be draggable, , do two
things:
a) Include the dragiframe.js file in the source
b) add this code to the <BODY> tag:
onLoad="addHandle(document.getElementById('toolbar'), window);"
Where 'toolbar' is the ID of an element on the page which should be the 'handle'
by which the IFRAME should be dragged (like a toolbar at the top).
If you want the IFRAME to be draggable by clicking anywhere in the IFRAME
document, use:
onLoad="addHandle(document.getElementsByTagName('body').item(0), window);"
NOTE: The code will automatically look up the window.parent tree to find a
parent document with draggable iframes enabled. It will attach itself to the
first document it finds, allowing it to work within a framed environment.
In your parent document (containing the IFRAMEs), you may set a couple of options:
// Set to true to always bring the selected IFRAME to the "top" of the zIndex.
// Defaults to false
bringSelectedIframeToTop(true|false);
// Set to true to allow IFRAME objects to be dragged off the screen. This may
// make the handle be no longer reachable by the mouse, causing the IFRAME to
// be stranded.
// Defaults to false
allowDragOffScreen(true|false);
// You may manually set this variable to define the highest zIndex used in
// your main document. This is used to determine what zIndex to give an IFRAME
// if it is selected and "bringSelectedIframeToTop" is set to true.
// Defaults to 99.
DIF_highestZIndex=4;
NOTES:
1) If you have defined onmousedown or onmouseup event handlers for your "handle"
object in the IFRAME, they will be over-written.
2) If you have defined an onmousemove handler in either the main document or
the IFRAME document, they will be over-written.
3) All <IFRAME> objects must have an ID!
*/
// iframe 屬性參考 :http://www.phpx.com/man/dhtmlcn/objects/IFRAME.html
// http://www.mattkruse.com/javascript/dragiframe/
// Variables used for "Draggable IFrame" (DIF) functions
var DIF_dragging=false;
var DIF_iframeBeingDragged="";
var DIF_iframeObjects=new Object();
var DIF_iframeWindows=new Object();
var DIF_iframeMouseDownLeft = new Object();
var DIF_iframeMouseDownTop = new Object();
var DIF_pageMouseDownLeft = new Object();
var DIF_pageMouseDownTop = new Object();
var DIF_handles = new Object();
var DIF_highestZIndex=99;
var DIF_raiseSelectedIframe=false;
var DIF_allowDragOffScreen=false;
// Set to true to always raise the dragged iframe to top zIndex
function bringSelectedIframeToTop(val) {
DIF_raiseSelectedIframe = val;
}
// Set to try to allow iframes to be dragged off the top/left of the document
function allowDragOffScreen(val) {
DIF_allowDragOffScreen=val;
}
// Method to be used by iframe content document to specify what object can be draggable in the window
function addHandle(o, win) {
if (arguments.length==2 && win==window) {
// JS is included in the iframe who has a handle, search up the chain to find a parent window that this one is dragged in
var p = win;
while (p=p.parent) {
if (p.addHandle) { p.addHandle(o,win,true); return; }
if (p==win.top) { return; } // Already reached the top, stop looking
}
return; // If it reaches here, there is no parent with the addHandle function defined, so this frame can't be dragged!
}
var topRef=win;
var topRefStr = "window";
while (topRef.parent && topRef.parent!=window) {
topRef = topRef.parent;
topRefStr = topRefStr + ".parent";
}
// Add handlers to child window
if (typeof(win.DIF_mainHandlersAdded)=="undefined" || !win.DIF_mainHandlersAdded) {
// This is done in a funky way to make Netscape happy
with (win) {
eval("function OnMouseDownHandler(evt) { if(typeof(evt)=='undefined'){evt=event;}"+topRefStr+".parent.DIF_begindrag(evt, "+topRefStr+") }");
eval("document.onmousedown = OnMouseDownHandler;");
eval("function OnMouseUpHandler(evt) { if(typeof(evt)=='undefined'){evt=event;}"+topRefStr+".parent.DIF_enddrag(evt, "+topRefStr+") }");
eval("document.onmouseup = OnMouseUpHandler;");
eval("function OnMouseMoveHandler(evt) { if(typeof(evt)=='undefined'){evt=event;}"+topRefStr+".parent.DIF_iframemove(evt, "+topRefStr+") }");
eval("document.onmousemove = OnMouseMoveHandler;");
win.DIF_handlersAdded = true;
win.DIF_mainHandlersAdded = true;
}
}
// Add handler to this window
if (typeof(window.DIF_handlersAdded)!="undefined" || !window.DIF_handlersAdded) {
eval("function OnMouseMoveHandler(evt) { if(typeof(evt)=='undefined'){evt=event;}DIF_mouseMove(evt, window) }");
eval("document.onmousemove = OnMouseMoveHandler;");
window.DIF_handlersAdded=true;
}
o.style.cursor="";
var name = DIF_getIframeId(topRef);
if (DIF_handles[name]==null) {
// Initialize relative positions for mouse down events
DIF_handles[name] = new Array();
DIF_iframeMouseDownLeft[name] = 0;
DIF_iframeMouseDownTop[name] = 0;
DIF_pageMouseDownLeft[name] = 0;
DIF_pageMouseDownTop[name] = 0;
}
DIF_handles[name][DIF_handles[name].length] = o;
}
// Generalized function to get position of an event (like mousedown, mousemove, etc)
function DIF_getEventPosition(evt) {
var pos=new Object();
pos.x=0;
pos.y=0;
if (!evt) {
evt = window.event;
}
if (typeof(evt.pageX) == 'number') {
pos.x = evt.pageX;
pos.y = evt.pageY;
}
else {
pos.x = evt.clientX;
pos.y = evt.clientY;
if (!top.opera) {
if ((!window.document.compatMode) || (window.document.compatMode == 'BackCompat')) {
pos.x += window.document.body.scrollLeft;
pos.y += window.document.body.scrollTop;
}
else {
pos.x += window.document.documentElement.scrollLeft;
pos.y += window.document.documentElement.scrollTop;
}
}
}
return pos;
}
// Gets the ID of a frame given a reference to a window object.
// Also stores a reference to the IFRAME object and it's window object
function DIF_getIframeId(win) {
// Loop through the window's IFRAME objects looking for a matching window object
var iframes = document.getElementsByTagName("IFRAME");
for (var i=0; i<iframes.length; i++) {
var o = iframes.item(i);
var w = null;
if (o.contentWindow) {
// For IE5.5 and IE6
w = o.contentWindow;
}
else if (window.frames && window.frames[o.id].window) {
w = window.frames[o.id];
}
if (w == win) {
DIF_iframeWindows[o.id] = win;
DIF_iframeObjects[o.id] = o;
return o.id;
}
}
return null;
}
// Gets the page x, y coordinates of the iframe (or any object)
function DIF_getObjectXY(o) {
var res = new Object();
res.x=0; res.y=0;
if (o != null) {
res.x = o.style.left.substring(0,o.style.left.indexOf("px"));
res.y = o.style.top.substring(0,o.style.top.indexOf("px"));
}
return res;
}
// Function to get the src element clicked for non-IE browsers
function getSrcElement(e) {
var tgt = e.target;
while (tgt.nodeType != 1) { tgt = tgt.parentNode; }
return tgt;
}
// Check if object clicked is a 'handle' - walk up the node tree if required
function isHandleClicked(handle, objectClicked) {
if (handle==objectClicked) { return true; }
while (objectClicked.parentNode != null) {
if (objectClicked==handle) {
return true;
}
objectClicked = objectClicked.parentNode;
}
return false;
}
// Called when user clicks an iframe that has a handle in it to begin dragging
function DIF_begindrag(e, win) {
// Get the IFRAME ID that was clicked on
var iframename = DIF_getIframeId(win);
if (iframename==null) { return; }
// Make sure that this IFRAME has a handle and that the handle was clicked
if (DIF_handles[iframename]==null || DIF_handles[iframename].length<1) {
return;
}
var isHandle = false;
var t = e.srcElement || getSrcElement(e);
for (var i=0; i<DIF_handles[iframename].length; i++) {
if (isHandleClicked(DIF_handles[iframename][i],t)) {
isHandle=true;
break;
}
}
if (!isHandle) { return false; }
DIF_iframeBeingDragged = iframename;
if (DIF_raiseSelectedIframe) {
DIF_iframeObjects[DIF_iframeBeingDragged].style.zIndex=DIF_highestZIndex++;
}
DIF_dragging=true;
var pos=DIF_getEventPosition(e);
DIF_iframeMouseDownLeft[DIF_iframeBeingDragged] = pos.x;
DIF_iframeMouseDownTop[DIF_iframeBeingDragged] = pos.y;
var o = DIF_getObjectXY(DIF_iframeObjects[DIF_iframeBeingDragged]);
DIF_pageMouseDownLeft[DIF_iframeBeingDragged] = o.x - 0 + pos.x;
DIF_pageMouseDownTop[DIF_iframeBeingDragged] = o.y -0 + pos.y;
}
// Called when mouse button is released after dragging an iframe
function DIF_enddrag(e) {
DIF_dragging=false;
DIF_iframeBeingDragged="";
}
// Called when mouse moves in the main window
function DIF_mouseMove(e) {
if (DIF_dragging) {
var pos = DIF_getEventPosition(e);
DIF_drag(pos.x - DIF_pageMouseDownLeft[DIF_iframeBeingDragged] , pos.y - DIF_pageMouseDownTop[DIF_iframeBeingDragged]);
}
}
// Called when mouse moves in the IFRAME window
function DIF_iframemove(e) {
if (DIF_dragging) {
var pos = DIF_getEventPosition(e);
DIF_drag(pos.x - DIF_iframeMouseDownLeft[DIF_iframeBeingDragged] , pos.y - DIF_iframeMouseDownTop[DIF_iframeBeingDragged]);
}
}
// Function which actually moves of the iframe object on the screen
function DIF_drag(x,y) {
var o = DIF_getObjectXY(DIF_iframeObjects[DIF_iframeBeingDragged]);
// Don't drag it off the top or left of the screen?
var newPositionX = o.x-0+x;
var newPositionY = o.y-0+y;
if (!DIF_allowDragOffScreen) {
if (newPositionX < 0) { newPositionX=0; }
if (newPositionY < 0) { newPositionY=0; }
}
DIF_iframeObjects[DIF_iframeBeingDragged].style.left = newPositionX + "px";
DIF_iframeObjects[DIF_iframeBeingDragged].style.top = newPositionY + "px";
DIF_pageMouseDownLeft[DIF_iframeBeingDragged] += x;
DIF_pageMouseDownTop[DIF_iframeBeingDragged] += y;
}
線上示範http://img.jb51.net/online/IFRAMEWindows/index.html
打包下載IFRAMEWindows.rar
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