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Animating the thumbnail filmstrip backgrounds

From: Create Animated Rollovers with jQuery and Dreamweaver

Video: Animating the thumbnail filmstrip backgrounds

Now we want to add a conditional statement inside of the animateThumbnail before we set the new thumbnail position. So inside of the brackets for animateThumbnail let's add a few lines. We're going to type if, beginning and ending parentheses, beginning and ending bracket. Let's split that open. Inside of the parentheses for if, we're going to type window.thumbnailPosition < 800 pixels which means we're at -800 plus the 200.

Animating the thumbnail filmstrip backgrounds

Now we want to add a conditional statement inside of the animateThumbnail before we set the new thumbnail position. So inside of the brackets for animateThumbnail let's add a few lines. We're going to type if, beginning and ending parentheses, beginning and ending bracket. Let's split that open. Inside of the parentheses for if, we're going to type window.thumbnailPosition < 800 pixels which means we're at -800 plus the 200.

So it's going to be 1,000 since we're concerned about the leftmost edge of the thumbnails. I'm going to select and copy window.thumbnail += 200. Since each width of the thumbnail screens we have inside of those large thumbnail filmstrips is 200 pixels, we're going to add 200 to the thumbnailPosition variable. Then on the bracket we're going to type else, beginning and ending bracket. So if the window.thumbnailPosition is not less than 800, we're going to paste window.thumbnailPosition.

We're going to set that = 0. At this point let's choose File>Save All. Let's click on design view and then let's hit Live view and watch the debugging area and we should see the thumbnails count up. When they get to -800, they go back to 0, and that's running twice every second. So now that we can watch that run, we know that this is working exactly as expected. Let's click out of Live view, let's go back to Code view for the video_gallery.js.

Now inside of our animateThumbnail function after the debug update, let's hit a Return, let's type a dollar sign, beginning and ending parentheses, two tick marks for string literal, a.videoLink.hover. So if our videoLink class has a hover state what we're going to do is change the CSS property. We're going to set css, beginning and ending parentheses, semicolon. Inside of the CSS, we're going to type two tick marks for string literal.

We're going to type background- position, then a comma, two more tick marks for string literal. Inside of the string literal we're going to type another tick mark, two plus signs, and another tick mark. So we're going to concatenate a variable inside of here. We're going to come up and grab the variable newPosition. We're going to copy that, paste it right here outside of the first tick mark, but inside of the second.

We're going to type px 0px. So what we're doing here is we're setting the X position to whatever that value is, which is going to be a negative number and we're going to keep the Y on the 0 px. Now we are only targeting video links with the hover class. This is because we only want the one we're hovering over to animate. So the last thing we're going to need to set is to come down into the hover function we created earlier. What we're going to do inside of here is when we roll over these individual video links, we're going to start with a dollar sign, (this).addClass beginning and ending parentheses, semicolon, two tick marks.

We're going to add the hover class to the item we're rolled over. Let's copy this, and when we roll out we're going to remove the hover class. So instead of addClass, we're going to come in and type remove. This way when we roll over the individual anchor tags with the videoLink class we're going to add the hover state, our set intervals are going to be running the whole time setting the background position of any item that has the hover class, and when we roll out, we're going to remove the hover class. This way again, only the item we're rolled over will have the background animated.

At this point let's choose File>Save All, back to Design view, and let's go to Live view and test it. Now with Live view on I can roll over the individual items. I can see the background graphics are now shifting. So now when these get to -800, which I can see down in the debugging area, they set back to 0. So this gives me a continuous loop through those large thumbnail graphics we created to act like filmstrips. Well, at this point we've completed both options for the animated rollovers, the standard animated rollovers which just move individual elements on a page which you can use with any web pages that you're currently working with.

This one here which adds the additional interval running at 500 milliseconds and then changing the background graphics into filmstrips and then moving those in the background of the CSS for the individual thumbnail graphics. Now in the next movie we'll talk about where you might want to go from here with this particular technique.

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