Question

Set an image to background / foreground .

Asked by: vb_elmar

Hello,

the script below is a drag and drop script. It has two images (crocodile and viking).

When dragging the viking image, the crocodile image
(unfortunately) is in the foreground.

How can i change the script, so that
- - the currently moved - -
image is in the foreground?

-It should be like this :

Example 1:
When dragging the viking image, the viking image should be
in the foreground, and the crocodile should be in the background.

Example 2:
When dragging the alligator image, the alligator image should be
in foreground, and the viking should be in the background.


<html>
<head>
<title></title>
</head>
<script>

xm = 0;
ym = 0;
M  = false;
window.onload = function(){
     document.onmousedown= function(e){
          if (!e) e = window.event;
          tg = (e.target) ? e.target : e.srcElement
          if(tg.className =="d" && e.button==1){
               M = tg;
               with(M.style){
                    xZ = pixelLeft-xm;
                    yZ = pixelTop-ym;          
               }
               return false;    
          }
               
     }
     document.onmouseup= function(){
          if(M){M = false;}
     }
     document.onmousemove=function(e){          
          if (!e) e = window.event;
          tg = (e.target) ? e.target : e.srcElement
               xm = (e.x || e.clientX);
               ym = (e.y || e.clientY);
               if(M){
                    M.style.pixelLeft=xm+xZ;
                    M.style.pixelTop=ym+yZ;          
                    return false
               }              
     }    
}

</script>


<body oncontextmenu="return false">

<p>
<img src="http://files.opera-info.de/bilder/forum/user/viking.gif" class="d" title="image 1" style="position:absolute;top:150px">
<img src="http://www.walterzorn.de/images/dragdrop/ddalligator.jpg" class="d" title="image 2" style="position:absolute">
</p>
</body>
</html>

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Asked On
2006-02-15 at 06:53:25ID21737638
Tags

background

,

set

,

image

Topic

JavaScript

Participating Experts
1
Points
500
Comments
7

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Answers

 

by: pD_EOPosted on 2006-02-15 at 07:17:46ID: 15960893

For onmousedown and onmousemove, give the element a zIndex of 100...

obj.zIndex = 100;

:)

 

by: pD_EOPosted on 2006-02-15 at 07:19:53ID: 15960924

So...

<html>
<head>
<title></title>
</head>
<script>

xm = 0;
ym = 0;
M  = false;
window.onload = function(){
     document.onmousedown= function(e){
          if (!e) e = window.event;
          tg = (e.target) ? e.target : e.srcElement
          if(tg.className =="d" && e.button==1){
               M = tg;
               with(M.style){
                    xZ = pixelLeft-xm;
                    yZ = pixelTop-ym;
                    zIndex = 100;          
               }
               return false;    
          }
               
     }
     document.onmouseup= function(){
          if(M){M = false;}
     }
     document.onmousemove=function(e){          
          if (!e) e = window.event;
          tg = (e.target) ? e.target : e.srcElement
               xm = (e.x || e.clientX);
               ym = (e.y || e.clientY);
               if(M){
                    M.style.pixelLeft=xm+xZ;
                    M.style.pixelTop=ym+yZ;
                    M.style.zIndex = 100;  
                    return false
               }              
     }    
}

</script>


<body oncontextmenu="return false">

<p>
<img src="http://files.opera-info.de/bilder/forum/user/viking.gif" class="d" title="image 1" style="position:absolute;top:150px">
<img src="http://www.walterzorn.de/images/dragdrop/ddalligator.jpg" class="d" title="image 2" style="position:absolute">
</p>
</body>
</html>

 

by: vb_elmarPosted on 2006-02-15 at 08:05:56ID: 15961475

@ pD_EO

I tried your sample. It doesn't help.

-Unfortunately, the crocodile image
remains in the foreground at all times.

 

by: pD_EOPosted on 2006-02-15 at 09:05:26ID: 15962312

Your code needs to be tweaked to work in Firefox, but playing around with the zIndex of the element you are dragging, it can be done.

pixelTop, pixelLeft are IE only.

Also, you are checking if the left mouse button is being used, in Firefox, it will report it as 0, but in IE it reports it as 1.

Maybe have a look at an API...

http://www.youngpup.net/2001/domdrag

 

by: vb_elmarPosted on 2006-02-15 at 10:37:54ID: 15963226

I tried your sample in IE.

-The sample did not work.

 

by: pD_EOPosted on 2006-02-15 at 14:07:56ID: 15965559

No, i'm talking about your script.  I was just pointing out to you that you need to set the zIndex for the image that is being dragged.

 

by: vb_elmarPosted on 2006-02-15 at 21:24:44ID: 15968300

I modified your suggestion.

-Now, the following sample works :



<html>
<head>
<title></title>
</head>
<script>

xm = 0;
ym = 0;
count = 0;
M  = false;
window.onload = function(){
     document.onmousedown= function(e){
          if (!e) e = window.event;
          tg = (e.target) ? e.target : e.srcElement
          if(tg.className =="d" && e.button==1){
               M = tg;
               count=count+1;
               with(M.style){
                    xZ = pixelLeft-xm;
                    yZ = pixelTop-ym;
                    zIndex = count;          
               }
               return false;    
          }
               
     }
     document.onmouseup= function(){
          if(M){M = false;}
     }
     document.onmousemove=function(e){          
          if (!e) e = window.event;
          tg = (e.target) ? e.target : e.srcElement
               xm = (e.x || e.clientX);
               ym = (e.y || e.clientY);
               if(M){
                    M.style.pixelLeft=xm+xZ;
                    M.style.pixelTop=ym+yZ;
                    return false
               }              
     }    
}

</script>


<body oncontextmenu="return false">

<p>
<img src="http://files.opera-info.de/bilder/forum/user/viking.gif" class="d" title="image 1" style="position:absolute;top:150px">
<img src="http://www.walterzorn.de/images/dragdrop/ddalligator.jpg" class="d" title="image 2" style="position:absolute"> </p>
</body>
</html>

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