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Thread: onload

  1. #1
    Join Date
    Dec 2012
    Posts
    2

    onload

    A Javascript newbie here. I forked this code and cannot get it to run outside of JSFiddle or Codepen. From what I read, I should try putting the Script after the page info and it still will not work for me. The error in Debug mode console: Uncaught TypeError: Cannot set property 'onmousemove' of null

    Not sure what I am doing wrong. I have had the same issue with a few other things I forked.. I just can't seem to get the logic down as to when/where the Javascript loads.

    Thank you for any help :-)

    <!DOCTYPE html>
    <html lang="en">
    <head>
    <meta charset="utf-8">
    <title>
    </title>
    <link rel="stylesheet" type="text/css" href="css/shadow.css" />
    </head>

    <body>
    <div class="wall">
    <p id="tsb-text">Cool Shadow
    </p>
    <div>
    </div>
    </div>
    <div id="tsb-spot">
    </div>
    </div>

    <script type="text/javascript">


    var text;
    var spot;
    //window.onload = init;
    init();
    function init() {
    text = document.getElementById('tsb-text');
    spot = document.getElementById('tsb-spot');

    document.getElementById('text-shadow-box').onmousemove = onMouseMove;
    document.getElementById('text-shadow-box').ontouchmove = function (e) {e.preventDefault(); e.stopPropagation(); onMouseMove({clientX: e.touches[0].clientX, clientY: e.touches[0].clientY});};

    onMouseMove({clientX: 300, clientY: 200});
    }
    function onMouseMove(e) {
    var xm = e.clientX - 300;
    var ym = e.clientY - 175;
    var d = Math.sqrt(xm*xm + ym*ym);
    text.style.textShadow = -xm + 'px ' + -ym + 'px ' + (d / 5 + 10) + 'px black';

    xm = e.clientX - 600;
    ym = e.clientY - 450;
    spot.style.backgroundPosition = xm + 'px ' + ym + 'px';
    }

    </script>

    </body>
    </html>

    +++++++++++++++++++++++

    The CSS

    body{
    background: url(http://iweb.uz/wp-content/uploads/20...ml5webbg.png);
    }
    #text-shadow-box {
    position: relative;
    width: 598px;
    height: 406px;
    background: #666;
    overflow: hidden;
    cursor: none;
    border: 1px solid #333;
    -webkit-tap-highlight-color: rgba(0,0,0,0);
    -webkit-user-select: none;
    }

    #text-shadow-box div.wall {
    position: absolute;
    top: 175px;
    left: 0;
    width: 100%;
    }

    #tsb-text {
    margin: 0;
    color: #fff;
    font-family: Helvetica, Arial, sans-serif;
    font-size: 80px;
    line-height: 0.1em;
    height: 1px;
    font-weight: bold;
    text-align: center;
    }

    div.wall div {
    position: absolute;
    background: #999;
    top: 42px;
    left: 0;
    height: 300px;
    width: 100%;
    }

    #tsb-spot {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url(http://iweb.uz/wp-content/uploads/2012/06/spotlight.png) top center;

  2. #2
    Join Date
    Aug 2008
    Location
    Sweden
    Posts
    227
    You don't have an element with the ID "text-shadow-box", thus document.getElementById('text-shadow-box') returns null.

  3. #3
    Join Date
    Dec 2012
    Posts
    2

    Red face Thank you

    Thank you, refreezed! I am not sure how I missed that.

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HTML5 Development Center

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