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POError: Unable to set value of the property 'src': object is null or undefined and CSS Error: Error in parsing value for 'top', Declaration dropped
 

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  1. POError: Unable to set value of the property 'src': object is null or undefined and CSS Error: Error in parsing value for 'top', Declaration dropped
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    <p>This is the JavaScript portion of my assignment website - it should display a dating ad and on interval move it around the screen, and at each interval it loads a new image</p> <p>It will randomly move horizontally, but won't move vertically. This problem happens in Firefox - in IE it has no problem.</p> <p>However in IE it won't iterate over the images, but it does in Firefox.</p> <p>Could anyone tell me what's going on?</p> <pre><code>&lt;script type="text/javascript"&gt; var rotatingAd = new Array(3); var curPosition = 1; var screenWidth = 0; var screenHeight = 0; for(var i = 0; i &lt; 4; ++i) { rotatingAd[i] = new Image(); rotatingAd[i].src = "AdDate" + i + ".gif"; } function openOrderForm() { window.open("order.html"); } function moveAd(){ var leftPos = getRandomLeft(); var topPos = getRandomTop(); document.getElementById("AdDate").style.top = topPos; + "px";//this is where firefox says the css error is document.getElementById("AdDate").style.left = leftPos + "px"; if(curPosition == 3) { curPosition = 0; } document.AdDatePic.src = rotatingAd[curPosition].src;//this is where IE gets its null error from curPosition++; } function start(){ screenWidth = document.body.clientWidth; screenHeight= document.body.clientHeight; //alert("width="+screenWidth + "height="+screenHeight) //setTimeout("moveAd()", 3000); setInterval("moveAd()", 2000); } function getRandomLeft(){ var lpos; lpos = Math.floor(Math.random()*(screenWidth -400)); return lpos; } function getRandomTop(){ tpos = Math.floor(Math.random()*(screenHeight - 135)); return tpos; } &lt;/script&gt; &lt;body onload="start();"&gt; &lt;span id="AdDate" style="position:absolute; left:300px; top:300px;" &gt; &lt;img id="AdDatePic" src="AdDate0.gif" alt="picture of gopher" /&gt; &lt;/span&gt; &lt;/body&gt; </code></pre>
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    1. USJosephK
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    1. COIs this an exact copy and paste of your source? You have a syntax error on the line with the comment about FireFox: `topPos; + "px"`
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      1. UScimmanon
    2. COyeah its a paste we have to use notepad++ so theres no syntax checking. however without the + px; i couldn't get the image to move at all
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      1. USJosephK
    3. COIn addition to the syntax error, IE can act quite differently when running in `standards` or `quirks` mode. What is your DOCTYPE and is it the very first line?
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      1. USJeremy J Starcher
 

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