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Switching to a global variable for animation calculations

From: Add a Wraparound Effect for a Marquee with jQuery and Dreamweaver

Video: Switching to a global variable for animation calculations

Now to begin modifying our marquee, let's go into the myMarquee project folder, let's open up the includes directory, and let's open up marquee.js up in Dreamweaver. Now if you prefer to take this course in a more code-only tool, we offer the same course in the lynda.com library using Aptana Studio instead of Dreamweaver. Now inside this JavaScript file, one of the first things we want to do is turn off our autoplay. So let's come over here to line 17 in the JS file and put two forward slashes before the set interval. This way the marquee won't automatically play, and will give us a chance to sort of test out and see how our script is evolving.

Switching to a global variable for animation calculations

Now to begin modifying our marquee, let's go into the myMarquee project folder, let's open up the includes directory, and let's open up marquee.js up in Dreamweaver. Now if you prefer to take this course in a more code-only tool, we offer the same course in the lynda.com library using Aptana Studio instead of Dreamweaver. Now inside this JavaScript file, one of the first things we want to do is turn off our autoplay. So let's come over here to line 17 in the JS file and put two forward slashes before the set interval. This way the marquee won't automatically play, and will give us a chance to sort of test out and see how our script is evolving.

Once our script is complete, we'll come back here and take out this comment. Now at the top of the script, we have a bunch of variables that we've declared. Let's hit a Return and let's declare one more variable, var photoWidth. We are going to set that equal to 0. Now we do use a variable later on in the script called marqueeWidth. We're going to be replacing that with this more global variable so that we can actually use this in a couple calculations that we are going to need to get this wraparound effect to work. So now that we've declared a variable called photoWidth, let's scroll down and inside of the document-ready function, let's hit a few returns after the setinterval, and what we want to do here is set the width of that based on the actual width of the marquee container.

So let's type window.photoWidth. We are going to set that equal to dollar sign, parentheses, tick marks inside for a string literal. We are going to do .marquee_container. Outside of the parentheses, .width, beginning and ending parentheses, then semicolon. So once the jQuery document-ready is done running, we're going to take the global variable photoWidth and set it to the width of the marquee container.

So now that we've disabled autoplay by commenting outset interval, we've set a new variable called photoWidth and set the value of that using jQuery to determine the marquee container width. In the next movie, we are going to go into the photo lineup statements and actually rearrange the photography.

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