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Thread: Help with DIVs

  1. #1
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    Need help with event listeners

    Hi

    I am using DOM-Drag (from young-pup.net, allows you to drag objects). The DOM-Drag.js looks like this:

    Code:
    /**************************************************
     * dom-drag.js
     * 09.25.2001
     * www.youngpup.net
     **************************************************
     * 10.28.2001 - fixed minor bug where events
     * sometimes fired off the handle, not the root.
     **************************************************/
    
    var Drag = {
    
    	obj : null,
    
    	init : function(o, oRoot, minX, maxX, minY, maxY, bSwapHorzRef, bSwapVertRef, fXMapper, fYMapper)
    	{
    		o.onmousedown	= Drag.start;
    
    		o.hmode			= bSwapHorzRef ? false : true ;
    		o.vmode			= bSwapVertRef ? false : true ;
    
    		o.root = oRoot && oRoot != null ? oRoot : o ;
    
    		if (o.hmode  && isNaN(parseInt(o.root.style.left  ))) o.root.style.left   = "0px";
    		if (o.vmode  && isNaN(parseInt(o.root.style.top   ))) o.root.style.top    = "0px";
    		if (!o.hmode && isNaN(parseInt(o.root.style.right ))) o.root.style.right  = "0px";
    		if (!o.vmode && isNaN(parseInt(o.root.style.bottom))) o.root.style.bottom = "0px";
    
    		o.minX	= typeof minX != 'undefined' ? minX : null;
    		o.minY	= typeof minY != 'undefined' ? minY : null;
    		o.maxX	= typeof maxX != 'undefined' ? maxX : null;
    		o.maxY	= typeof maxY != 'undefined' ? maxY : null;
    
    		o.xMapper = fXMapper ? fXMapper : null;
    		o.yMapper = fYMapper ? fYMapper : null;
    
    		o.root.onDragStart	= new Function();
    		o.root.onDragEnd	= new Function();
    		o.root.onDrag		= new Function();
    	},
    
    	start : function(e)
    	{
    
    		var o = Drag.obj = this;
    
    		if(o.root.cancelDrag) return false;
    
    		e = Drag.fixE(e);
    		var y = parseInt(o.vmode ? o.root.style.top  : o.root.style.bottom);
    		var x = parseInt(o.hmode ? o.root.style.left : o.root.style.right );
    		o.root.onDragStart(x, y);
    
    		o.lastMouseX	= e.clientX;
    		o.lastMouseY	= e.clientY;
    
    		if (o.hmode) {
    			if (o.minX != null)	o.minMouseX	= e.clientX - x + o.minX;
    			if (o.maxX != null)	o.maxMouseX	= o.minMouseX + o.maxX - o.minX;
    		} else {
    			if (o.minX != null) o.maxMouseX = -o.minX + e.clientX + x;
    			if (o.maxX != null) o.minMouseX = -o.maxX + e.clientX + x;
    		}
    
    		if (o.vmode) {
    			if (o.minY != null)	o.minMouseY	= e.clientY - y + o.minY;
    			if (o.maxY != null)	o.maxMouseY	= o.minMouseY + o.maxY - o.minY;
    		} else {
    			if (o.minY != null) o.maxMouseY = -o.minY + e.clientY + y;
    			if (o.maxY != null) o.minMouseY = -o.maxY + e.clientY + y;
    		}
    
    		document.onmousemove	= Drag.drag;
    		document.onmouseup		= Drag.end;
    
    		return false;
    	},
    
    	drag : function(e)
    	{
    		e = Drag.fixE(e);
    		var o = Drag.obj;
    
    		var ey	= e.clientY;
    		var ex	= e.clientX;
    		var y = parseInt(o.vmode ? o.root.style.top  : o.root.style.bottom);
    		var x = parseInt(o.hmode ? o.root.style.left : o.root.style.right );
    		var nx, ny;
    
    		if (o.minX != null) ex = o.hmode ? Math.max(ex, o.minMouseX) : Math.min(ex, o.maxMouseX);
    		if (o.maxX != null) ex = o.hmode ? Math.min(ex, o.maxMouseX) : Math.max(ex, o.minMouseX);
    		if (o.minY != null) ey = o.vmode ? Math.max(ey, o.minMouseY) : Math.min(ey, o.maxMouseY);
    		if (o.maxY != null) ey = o.vmode ? Math.min(ey, o.maxMouseY) : Math.max(ey, o.minMouseY);
    
    		nx = x + ((ex - o.lastMouseX) * (o.hmode ? 1 : -1));
    		ny = y + ((ey - o.lastMouseY) * (o.vmode ? 1 : -1));
    
    		if (o.xMapper)		nx = o.xMapper(y)
    		else if (o.yMapper)	ny = o.yMapper(x)
    
    		Drag.obj.root.style[o.hmode ? "left" : "right"] = nx + "px";
    		Drag.obj.root.style[o.vmode ? "top" : "bottom"] = ny + "px";
    		Drag.obj.lastMouseX	= ex;
    		Drag.obj.lastMouseY	= ey;
    
    		Drag.obj.root.onDrag(nx, ny);
    		return false;
    	},
    
    	end : function()
    	{
    		document.onmousemove = null;
    		document.onmouseup   = null;
    		Drag.obj.root.onDragEnd(	parseInt(Drag.obj.root.style[Drag.obj.hmode ? "left" : "right"]), 
    									parseInt(Drag.obj.root.style[Drag.obj.vmode ? "top" : "bottom"]));
    		Drag.obj = null;
    	},
    
    	fixE : function(e)
    	{
    		if (typeof e == 'undefined') e = window.event;
    		if (typeof e.layerX == 'undefined') e.layerX = e.offsetX;
    		if (typeof e.layerY == 'undefined') e.layerY = e.offsetY;
    		return e;
    	}
    };
    So basically you can say:
    Drag.init(myElement);
    and that element will be draggable. The element will start dragging when the onmousedown event is fired in the element.

    However, I want it so that I can start the element dragging when something else happens: when the element is first created with createElement and appendChild.

    Is it possible to do this? Do I need to create a new event listener - if so, how? I know I am asking a lot, but I have been trying for days now! Perhaps you could just point me towards a tutorial or something that will help me out?

    Thanks so much,

    Shai
    Last edited by shaiphp; Nov 27, 2005 at 13:26.


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