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Taken From The Forum: Help & Support for DHTML Menu Version 5+
Forum Topic: Click to view post
Last Updated: Thursday February 8 2018 - 06:02:18

Setting Alpha filters for a menu item? and manipulating them


Poster: cubefree
Dated: Saturday November 29 2003 - 15:58:53 GMT

I know about the overfilter attribute, however that controls the alpha filters for an entire menu.

Is there a way to control alpha filters for a single menu item cell?

Is there a way to set it from the get-go without using onfunction/offfunction attibutes?


I am experimenting with the following code for opacity changes...

Code: Select all

function changeOpacity( objID, opacity )
 {
  document.all[objID].style.filter = "progid:DXImageTransform.Microsoft.Alpha(opacity=" + opacity + ");";
 }


but the question remains how to identify the cell of the menu.

I have some other code I've got working to manipulate a table cell, but it needs some work.

Code: Select all


var apl = new Array();
apl[0] = new Array(65,"");
apl[1] = new Array(65,"");
apl[2] = new Array(65,"");
apl[3] = new Array(65,"");

// Opacity variables and function
nOpac = 50
nPlus = 2
nMin = 1
speed = 30
timer = null;
timer2 = null;

function topfadein(teller)
{
 apl[teller][1] = "Up";
 topchanges();
}

function topfadeout(teller)
{
 apl[teller][1] = "Down";
 setTimeout("topchanges()",50);
}

function topchanges()
{
 next_loop = true;
 for (i=0;i<apl.length;i++)
 {
  obj = main.rows[0].cells[i];
  opacity = apl[i][0]
  if (apl[i][1] == "Up")
  {
     opacity += nPlus;
     apl[i][0] = opacity;
     if (apl[i][0] > 105)
      {apl[i][1] = "";}
     else
     {next_loop = false;}
    nOpac = opacity;
  }
  else
  {
  if (apl[i][1] == "Down")
  {
     opacity -= nMin;
     apl[i][0] = opacity;
     if (apl[i][0] < 65)
      {apl[i][1] = "";}
     else
     {next_loop = false;}
    nOpac = opacity;
  }
  }
  if(ie5){
   obj.style.filter="alpha(opacity="+opacity+")";
    }
  if(ns6){
      obj.style.MozOpacity = opacity + '%';
   }
 }
 if (next_loop == false)
  {
   timer = setTimeout("topchanges()",speed);
  }
  else
  {
   clearTimeout(timer);
  }
}


You can see that code in action at http://www.cubefree.com ( the milonic menu is not yet activated on this site tho)[/b]


Poster: cubefree
Dated: Monday December 15 2003 - 19:06:14 GMT

Sorry to reply to my own post... but the length of my message requires a new post.

You can see my acceptable solution here: http://www.cubefree.com/menu.htm


Here's a reply from Andy:
> Yes, the variable _itemRef is the currently selected item id and is global. Take a look at http://www.milonic.com/menusample.php?sampleid=15

AND

Try this.

function changeOpacity( objID, opacity )
{
var obj = gmobj("el"+objID);
obj.style.filter =
"progid:DXImageTransform.Microsoft.Alpha(opacity=" + opacity + ");";
}


I was still getting the following error trying to manipulate the opacity of an entire cell:

> Line: 17
> Char: 8672
> Error:'_m[...].23' is null or not an object

So, I manipulated the image only in the horizontial nav.

Here's the code I used:

Code: Select all

// Opacity variables and function
var nPlus   = 2;
var nMin    = 3;
var speed   = 10;
var timer   = null;
var timer2  = null;

function changeOpacityUp( objID, zOpacity )   
{
   nOpac   = 65;
   upObj   = gmobj(objID);
   direction = "Up";
   fadeUp();
}

function changeOpacityDown( objID, zOpacity )
{
   dOpac = 65;
   downObj   = gmobj(objID);
   direction = "Down";
   setTimeout("fadeDown()", 50);
}

function fadeUp()
{
   //alert(nOpac);
   next_loop = true;
   opacity = nOpac;
   if (direction == "Up")
   {
   opacity += nPlus;
   nOpac = opacity;
   if (nOpac > 105)
      {direction = "";}
   else
      {next_loop = false;}
   nOpac = opacity;
   }
   
   if(document.all && document.getElementById){
      upObj.filters.item("DXImageTransform.Microsoft.Alpha").opacity = opacity;
   }
   if(document.getElementById && !document.all){
      //obj.style.MozOpacity = opacity + '%';
   }
   
   if (next_loop == false)
   {
      timer = setTimeout("fadeUp()",speed);
   }
   else
   {
   //   alert("timer cleared");    
      clearTimeout(timer);
   }
}

function fadeDown()
{
   next_loop = true;
   opacity = dOpac;
   if (direction == "Down")
   {
      opacity -= nMin;
      dOpac = opacity;
      if (dOpac < 65)
      { direction = ""; }
      else
      { next_loop = false; }
      dOpac = opacity;
   }

     if(document.all && document.getElementById){
       downObj.filters.item("DXImageTransform.Microsoft.Alpha").opacity = opacity;
      }
     if(document.getElementById && !document.all){
      //obj.style.MozOpacity = opacity + '%';
      }

    if (next_loop == false)
     {
      timer2 = setTimeout("fadeDown()",speed);
     }
     else
     {
        //alert("timer2 cleared and loop = " + next_loop);
      
      clearTimeout(timer2);
     }
}


Ok, hope someone else has some ideas on how to manipulate the cell itself.

Thx
Cubeman