JavaScript global variable not functioning properly when linked to external JavaScript file

After encountering issues with my slideshow, I decided to declare a variable outside of an external JS file due to part of it being generated server-side.

<script type="text/javascript">
     var images=new Array(<%= Master.slideshowArray %>);
</script>

I noticed that removing this code from the external JS file caused the slideshow to stop working. I suspect that I may have incorrectly declared it as a global variable or there could be another global declaration needed. Any suggestions?

var nextimage=0;

doSlideshow();

function doSlideshow()
{
    if($('.backgroundImage').length!=0)
    {
        $('.backgroundImage').fadeOut(500,function(){slideshowFadeIn();$(this).remove();});
    }
    else
    {
        slideshowFadeIn();
    }
}

function slideshowFadeIn()
{
    if(nextimage>=images.length) 
        nextimage=0;

    $('.homeLeadContent').prepend($('<img class="backgroundImage" src="'+images[nextimage++]+'" style="display:none;">').fadeIn(500,function() {
        setTimeout(doSlideshow,1000);
    }));
}

Answer №1

Is it crucial that the script tag for the external js file appears before the var images=... inline script tag?

In the realm of web browsers, code execution follows the order in which it is encountered. Therefore, if the external js file takes precedence, the doSlideShow() function will be triggered ahead of time, potentially invoking slideshowFadeIn() and attempting to access an images variable that hasn't been defined yet.

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