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Draggable IFRAME Windows



Source Type:Fully formatted code - Best for understanding and editing
Source File:dragiframe.js (Right-click and "save as")
File size:8k


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/**
 * Copyright (c)2005-2009 Matt Kruse (javascripttoolbox.com)
 * 
 * Dual licensed under the MIT and GPL licenses. 
 * This basically means you can use this code however you want for
 * free, but don't claim to have written it yourself!
 * Donations always accepted: http://www.JavascriptToolbox.com/donate/
 * 
 * Please do not link to the .js files on javascripttoolbox.com from
 * your site. Copy the files locally to your server instead.
 * 
 */
// 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;");
    eval("function OnMouseUpHandler(evt) { if(typeof(evt)=='undefined'){evt=event;}DIF_enddrag(evt, window) }");
    eval("document.onmouseup = OnMouseUpHandler;");
    window.DIF_handlersAdded=true;
    }
  o.style.cursor="move";
  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;
  }