Java-Script/pratice3.html at main · 26312/Java-Script · GitHub

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<!DOCTYPE html>
<head>
    <title>Animation In JavaScript</title>
</head>
<body>
        <button id="btn1" onclick="fadeOut()">FADE OUT</button>
        <br>
        <br>
        <img id="img" src="images/heart.jpg" width= "500px">
        <br>
        <br>
        <button id="btn2" onclick="fadeIn()">FADE IN</button>

</body>
<script type="text/javascript">
    var opacity = 0;
    var intervalID = 0;

    function fadeOut(){

        intervalID = setInterval(hide,100);
    }
    function hide()
    {
        var img = document.getElementById("img");
        opacity = Number(window.getComputedStyle(img).getPropertyValue("opacity"));

        if(opacity>0){

            opacity = opacity-0.1;
            img.style.opacity = opacity;
        }
        else{

            clearInterval(intervalID);
        }
    }
    // End of Fadeout Function

    function fadeIn(){

        intervalID = setInterval(show,200);
    }
    function show(){

        var img = document.getElementById("img");
        opacity = Number(window.getComputedStyle(img).getPropertyValue("opacity"));
        if(opacity<1){
            opacity = opacity + 0.1;
            img.style.opacity = opacity;
        }
        else{
            clearInterval(intervalID);
        }
    }


</script>

</html>