i need help with a div opacity fading script.

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I need help trimming and correcting my failing div fading script.
Please help.

XML

<html>
<script>
function fader1() {
document.getElementById("myid").style.opacity= a;
}
var a = 100;
do
{
fader1()
}
while (--a);
</script>

<div id="myid">
This is text.
</div>
</html>

Posted 4-Dec-13 16:55pm

Member 10390921

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enhzflep · Answer 1 · 2013-12-06T22:59:00

Here's the contents of my fadeElem.js file.

Usage:

JavaScript

mFadeIn(document.getElementById('idOfElementToFade'), nameOfFunctionToCallWhenFadeComplete);

or, if you dont want to do anything when fading is complete, dont supply a callback

JavaScript

mFadeIn( document.getElementById('idOfElementToFade') );

mFadeOut has the same syntax, it just fades in the opposite direction.

JavaScript

var totalTime = 100;        // time in ms
var ANIMATION_STEPS = 10;   // num steps to go from 0% to 100% or 100% to 0%
var ANIMATION_DELAY = totalTime / ANIMATION_STEPS;  // number of ms between steps

function mFadeIn(element, callback)
{
    element.style.opacity = "0.0";
    element.style.display = "block";
    var stepSize = 1 / ANIMATION_STEPS;
    setTimeout(function(){mAnimStep(element,0,stepSize, true, callback)},ANIMATION_DELAY);
}
function mFadeOut(element, callback)
{
    element.style.opacity = "1.0";
    element.style.display = "block";
    var stepSize = 1 / ANIMATION_STEPS;
    setTimeout(function(){mAnimStep(element,0,stepSize, false, callback)},ANIMATION_DELAY);
}

function mAnimStep(element, iteration, stepSize, boolIsFadeIn, callback)
{
    if (iteration < ANIMATION_STEPS)
    {
        if (boolIsFadeIn == true)
            element.style.opacity = (iteration * stepSize);
        else
            element.style.opacity = (ANIMATION_STEPS - iteration) * stepSize;

        iteration++;
        setTimeout(function(){mAnimStep(element,iteration,stepSize,boolIsFadeIn, callback)}, ANIMATION_DELAY);
    }
    else
    {
        element.style.opacity = "";
        if (boolIsFadeIn == false)
            element.style.display = 'none';
        if (!((callback==null)||(callback==undefined)))
        {
            callback();
        }
    }
}

Peter Leow · Answer 2 · 2013-12-04T17:16:00

Solution 1

Try using jQuery, some example here:

http://www.w3schools.com/jquery/tryit.asp?filename=tryjquery_fadeout[^]

http://www.w3schools.com/jquery/jquery_fade.asp[^]

Posted 4-Dec-13 17:16pm

Peter Leow

Updated 4-Dec-13 17:17pm

v2

Member 10390921 · Answer 3 · 2013-12-06T21:27:00

Solution 2

I prefer not using the third-party jQuery plugin. Are there Any ways to do this with normal JavaScript?

Posted 6-Dec-13 21:27pm

Member 10390921

Comments

enhzflep 7-Dec-13 4:50am

Please dont post comments as answers. Use the 'Have a Question or Comment' button that follows a solution instead. In the case of a comment, hover over the comment and click the reply button.