Create an Interactive Homepage Marquee with jQuery and Dreamweaver
Illustration by John Hersey

Create an Interactive Homepage Marquee with jQuery and Dreamweaver

with Chris Converse

Video: Setting the marquee state based on first panel data in the HTML

Now to initialize our marquee when the page loads, we're going to do two things: We're going to put an image preloader on there to make sure that all of the images are loaded. so that when we initiate the marquee and all the transitions happen, we know the images have been downloaded. Then we're going to create a separate initialization function that we can call once the images are preloaded. So to start, let's scroll back up in our JavaScript file and let's go inside of our (document).ready. We'll just put this right at the top. We'll put a comment, //Preload.

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Watch the Online Video Course Create an Interactive Homepage Marquee with jQuery and Dreamweaver
1h 34m Intermediate May 26, 2011

Viewers: in countries Watching now:

Discover how to build a visually rich, interactive marquee in order to aggregate and display content on a web site homepage. Author Chris Converse shows how to prepare the artwork in Photoshop and Illustrator, create HTML and CSS layouts, and dynamically generate marquee elements with the open-source JavaScript framework jQuery. Tutorials on animating between content panels are also included.

Topics include:
  • Linking the HTML and CSS layouts
  • Preparing images with the Slice tool and Smart Objects
  • Adding CSS rules for the captions and navigation
  • Producing the photo lineup
  • Creating the navigation links based on the HTML
  • Setting click events for the navigation
  • Animating between photos
  • Initializing the gallery on page load
Subject:
Web
Software:
Dreamweaver jQuery
Author:
Chris Converse

Setting the marquee state based on first panel data in the HTML

Now to initialize our marquee when the page loads, we're going to do two things: We're going to put an image preloader on there to make sure that all of the images are loaded. so that when we initiate the marquee and all the transitions happen, we know the images have been downloaded. Then we're going to create a separate initialization function that we can call once the images are preloaded. So to start, let's scroll back up in our JavaScript file and let's go inside of our (document).ready. We'll just put this right at the top. We'll put a comment, //Preload.

And here we're going to make use of the image preload from farinspace that we downloaded earlier. So we're going to choose Dollar sign, beginning and ending parentheses, two tick marks for a string literal. We're going to target marquee_panels. That's the div that's actually hidden with CSS that has all of our content in it. Inside of marquee_panels, inside of the string literal, do a space img. So we're going to go through and search for all the images, which is going to include all the photos and all the flags.

We're going to make sure all of those are loaded. Outside of the parentheses, we're going to type 'imgpreload'. That's the name of the plug-in function that farinspace is adding ();. Inside of the parentheses, type 'function', beginning and ending parentheses, beginning and ending brackets. This is going to act as a callback. So once all the images are loaded, we're going to run the instructions inside of this particular function.

We're going to type initializeMarquee. This is a function name we're making up. So let's copy this function name, scroll down to the bottom of our page. After set caption, we're going to write a custom function. Let's Command+V or Ctrl+V to paste initializeMarquee. (), {}, split that open.

Now inside of this function, we basically want to set the initial state of the marquee. So we want to take the first photograph and the first caption, set them, and animate them as if somebody had clicked on the very first button. So let's start with a $('marquee_caption_content').html.

We want to set the HTML and the marquee captioning content, ();. Let's get inside of there, inside the parentheses, let's split that open, so it's easier to read, $('.marquee_panels .marquee_panel:first .marquee_panel_caption').

So basically what this is doing is it's going into marquee_panels, finding the first marquee panel, which is the individual panel inside of the panels, and it's finding the panel_caption inside of there. Outside of the parentheses .html();. Also on the first line, make sure we put a period before marquee_ captioning)_content on line 57. So what we're basically doing here is we're setting the marquee_panel_caption up here, the content of this, inside of the marquee_container to the first marquee panel.

On the next line $('.marquee_nav a. marquee_nav_item:first'). So if it's the first marquee_nav item in the list, we're going to addClass('selected');, so we're going to take the first navigation item and add the selected class.

Next line, $('.marquee_photos').fadeIn, a built-in jQuery function to animate the opacity, ();, inside fadeIn(1500). This will take a second and a half. And then we're going to run the setCaption function.

Let's come up here and just copy, Ctrl+C or Command+C, down here Command+V or Ctrl+V, paste, run the setCaption. Before we test this, I did make one error. Let's come up here and take off the semicolon on line 58 after html. This is happening inside of a parentheses already with the semicolon statement, so we don't need the semicolon at the end of this. Choose File > Save. Let's go out to our browser. Let's open the index file in the browser, and we should see right away the very first item gets highlighted, the captioning gets set, animated up, and the photo fades in over a second and a half.

Well, that ends everything what we need to do for the interactive marquee. In the introduction movie, we actually went in and added a little bit of content to some of the captions to show how this can vary on different heights, so I want to encourage you to try adding and removing panels and adding and removing content inside of the caption area. In the next movie, we'll talk about some things you might want do to extend the capabilities of this particular marquee.

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