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POJava script - Keep buttons hidden until page load
 

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  1. POJava script - Keep buttons hidden until page load
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    <p>I have built a horizontal scrolling website. I don't really know much about Java Script, but I downloaded this script called Horizontal Tiny Scroller that lets you scroll the website horizontally, without using the scroll bar.</p> <p>Everything works perfectly except the script only loads once everything else on the page has finished loading. As my site has a high number of graphics, this creates a usability as the scroller buttons do not immediately work. I'm guessing most the users will assume that the buttons are broken.</p> <p>After a bit of research I have found that there is no solution to making the buttons load before the graphic, so I will just have to hide the buttons until the page has loaded.</p> <p>The Tiny Scroller script uses a document.writeln command to make the buttons appear on the page:</p> <pre><code>document.writeln('&lt;a href="javascript://" id="left-arrow"&gt;&lt;/a&gt;\n&lt;a href="javascript://" id="right-arrow"&gt;&lt;/a&gt;'); </code></pre> <p>Using online tutorials, I created two CSS classes: <code>.visible {display:block;}</code> <code>&amp; .hidden {display:none;}.</code> I rewrote the <code>document.writeln</code> command so the buttons were assigned the <code>.hidden</code> class by default:</p> <pre><code>document.writeln('&lt;a href="javascript://" id="left-arrow" class="hidden"&gt;&lt;/a&gt;\n&lt;a href="javascript://" id="right-arrow" class="hidden"&gt;&lt;/a&gt;'); </code></pre> <p>Finally, I wrote an <code>onload=function</code> to swap the <code>.hidden</code> class with the <code>.visible</code> class:</p> <pre><code>onload=function() { document.getElementById('left-arrow').className='visible'; document.getElementById('right-arrow').className='visible'; } </code></pre> <p>The finished script can be seen <a href="http://olo.uk.com/sites/all/themes/olotheme/scripts/body-scroller.js" rel="nofollow noreferrer">here</a></p> <p>Everything works fine, and the buttons only appear when the page has loaded. HOWEVER, the scrolling function doesn't work any more! If I delete the <code>onload=function</code> everything works again (but then of course the buttons appear before the page has finished loading).</p> <p>Does anyone have any pointers as to what I'm doing wrong?</p>
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