Question

Fading IN and OUT from JS function

Asked by: hankknight

Hello,

I use the following script to have the contents of a table slowly fade out.

It works great, but now I would like a little more control over it.

It works great for fading out, but I want to be able to fade in and out, and control the speed.


Like this:

    fadeMyTable (NAME_OF_ID,CURRENT_OPACITY,FINAL_OPACTITY,SPEED)

For example:

    fadeMyTable ('myTable',100,30,10)
     - This should start at 100% opacity and fade to 30% slowly

    fadeMyTable ('myTable',100,30,1)
     - This should start at 30% opacity and return to 100% QUICKLY


Any ideas?

Thanks!


<script>
// Thanks, brunobear
fade = {
    speed : 5,
    finalOpacity : 30,
    currentOpacity : 100,
    elID : null,
    init : function(el) {
        fade.elID = el;
        if (!document.getElementById(el)) return;
            fadeInterval = setInterval('fade.doFade()',fade.speed);
    },
    doFade : function(obj) {
        obj = document.getElementById(fade.elID);
        if (fade.currentOpacity>fade.finalOpacity) {
            var newOpacity = fade.currentOpacity - 1;
            obj.style.opacity = "."+(newOpacity);
            obj.style.filter = "alpha(opacity="+newOpacity+")";
            fade.currentOpacity = newOpacity;
        } else {
            clearInterval(fadeInterval);
        }
    }
}
</script>

<a href=#" onclick="fade.init('myTable');return false">fade table</a>

<table id="myTable" width=550 class="mytableclass" background="http://www.google.com/images/logo.gif"><tr><td height=210>cell 1</td><td>cell 2</td><td>cell 3</td></tr></table>

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Asked On
2006-07-05 at 23:14:27ID21909621
Tags

fade

,

function

Topic

JavaScript

Participating Experts
2
Points
500
Comments
6

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Answers

 

by: ed987Posted on 2006-07-06 at 05:40:30ID: 17050110

<script>
// Thanks, brunobear
fade = {
    step: 18,
    speed : 0.1,
    finalOpacity : 30,
    currentOpacity : 100,
    elID : null,
    init : function(el) {
        fade.elID = el;
      if(arguments.length>1)
      {
         fade.currentOpacity=arguments[1];
         fade.finalOpacity=arguments[2];
         fade.speed=arguments[3];
         if(fade.currentOpacity<fade.finalOpacity)fade.step*=-1;
      }
      if(arguments.length>4)fade.step=arguments[4];
        if (!document.getElementById(el)) return;
            fadeInterval = setInterval('fade.doFade()',fade.speed);
    },
    doFade : function(obj) {
        obj = document.getElementById(fade.elID);
        if (fade.step>0&&(fade.currentOpacity-fade.step>fade.finalOpacity)) {
            var newOpacity = fade.currentOpacity - fade.step;
          if(newOpacity<10)newOpacity='0'+newOpacity;
            obj.style.opacity = "."+(newOpacity);
            obj.style.filter = "alpha(opacity="+newOpacity+")";
            fade.currentOpacity = newOpacity;
        }
        else if (fade.step<0&&(fade.currentOpacity-fade.step<fade.finalOpacity)) {
            var newOpacity = fade.currentOpacity - fade.step;
          if(newOpacity<10)newOpacity='0'+newOpacity;
            obj.style.opacity = "."+(newOpacity);
            obj.style.filter = "alpha(opacity="+newOpacity+")";
            fade.currentOpacity = newOpacity;
        }
      else {
          var newOpacity = fade.finalOpacity;
          if(newOpacity<10)newOpacity='0'+newOpacity;
            obj.style.opacity = "."+(newOpacity);
            obj.style.filter = "alpha(opacity="+newOpacity+")";
            fade.currentOpacity = newOpacity;
            clearInterval(fadeInterval);
        }
    }
}
</script>

 

by: ed987Posted on 2006-07-06 at 06:05:20ID: 17050275

a few corrections, and extra optional parameter step
(NAME_OF_ID,CURRENT_OPACITY,FINAL_OPACTITY,SPEED,   STEP)
which could make transition faster, but less smooth

<script>
// Thanks, brunobear
fade = {
    step: 5,
    speed : 0.1,
    finalOpacity : 30,
    currentOpacity : 100,
    elID : null,
    init : function(el) {
        fade.elID = el;
      if(arguments.length>1)
      {
         fade.currentOpacity=arguments[1];
         fade.finalOpacity=arguments[2];
         fade.speed=arguments[3];
         if(fade.currentOpacity<fade.finalOpacity&&fade.step>0)fade.step*=-1;
      }
      if(arguments.length>4)fade.step=arguments[4];
        if (!document.getElementById(el)) return;
      fade.setOP(fade.currentOpacity);
        fadeInterval = setInterval('fade.doFade()',fade.speed);
    },
    setOP : function(newOpacity) {
      obj = document.getElementById(fade.elID);
      if(newOpacity<10)newOpacity='0'+newOpacity;
        if(newOpacity<100)obj.style.opacity = "."+(newOpacity);else obj.style.opacity = 1;
        obj.style.filter = "alpha(opacity="+newOpacity+")";
        fade.currentOpacity = newOpacity;
    },
    doFade : function(obj) {        
        if (fade.step>0&&(fade.currentOpacity-fade.step>fade.finalOpacity)) {
          fade.setOP(fade.currentOpacity - fade.step);
        }
        else if (fade.step<0&&(fade.currentOpacity-fade.step<fade.finalOpacity)) {
          fade.setOP(fade.currentOpacity - fade.step);
        }
      else {
          fade.setOP(fade.finalOpacity);
            clearInterval(fadeInterval);
        }
    }
}
</script>

 

by: brunobearPosted on 2006-07-06 at 11:50:57ID: 17053073

step in a nice addition, as setInterval seems to have limits on the speed it can handle

 

by: ed987Posted on 2006-07-06 at 14:05:42ID: 17054133

btw " speed : 0.1," is a mistake, i just set it initially as
i was surprised fade with initial settings was quite slow and didn't yet read source code.
might be best if you didn't use speed values below 20, try to increase step instead.

 

by: hankknightPosted on 2006-07-07 at 08:09:21ID: 17059139

Thank you!

The fading out works, but the fading back in does not:

<a href=#" onclick="fade.init('myTable','100','20','20','2');return false">Fade Out</a>
<a href=#" onclick="fade.init('myTable','20','100','20','2');return false">Fade Back In</a>

<table id="myTable" width=550 background="http://www.google.com/images/logo.gif"><tr><td height=210>cell 1</td><td>cell 2</td><td>cell 3</td></tr></table>

 

by: hankknightPosted on 2006-07-07 at 11:36:10ID: 17060935

Hello,

Thanks for the answer!

I have decided that my above comment is actually another separate question, so I have posted it here.
http://www.experts-exchange.com/Web/Web_Languages/JavaScript/Q_21911851.html

20120131-EE-VQP-002

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