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: Searching all the photos in the data region

So, before we start writing our JavaScript in Dreamweaver, I want to come over to the index file. Switch into Code view. I want to scroll up here, so that we can see the marquee_panel div, so I can see all the HTML markup inside of here. I am going to come back to the operating system, and I am going to open the marquee.js file up in Coda, which is a separate text editor. I want to be able to see the text we writing and have Dreamweaver show me the HTML code in the background. So inside of our JavaScript document, the first thing we are going to do is set up the document ready inside of jQuery.

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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

Searching all the photos in the data region

So, before we start writing our JavaScript in Dreamweaver, I want to come over to the index file. Switch into Code view. I want to scroll up here, so that we can see the marquee_panel div, so I can see all the HTML markup inside of here. I am going to come back to the operating system, and I am going to open the marquee.js file up in Coda, which is a separate text editor. I want to be able to see the text we writing and have Dreamweaver show me the HTML code in the background. So inside of our JavaScript document, the first thing we are going to do is set up the document ready inside of jQuery.

So I'll hit a few lines returns, type a Dollar sign, beginning and ending parentheses. Inside there we will type 'document', and outside of the parentheses we'll put '.ready' beginning and ending parentheses and a semicolon. This is the ready statement for jQuery which will go through and make sure all of the HTML has been downloaded. Inside of ready, type function(){}.

This function is going to execute once everything has been loaded, so everything in between this line here, will now get executed once all of the code's been downloaded. So the first thing we are going to do is to create a photo lineup. So I want to put two forward slashes for a comment. I can type 'Generate Photo Lineup'. So the first thing we want to do in here is go through all of the marquee panels and find all of the photography and pull out the different values from that. So we are going to start by typing in a Dollar sign, beginning and ending parentheses.

Inside of the parentheses, we will add two tick marks and inside of the tick marks, for the string literal, we are going to type 'img.marquee_panel_photo' And we can see that up here in HTML code we are going to go through all the marquee panels and we are going to find any image tag that has marquee_panel_photo assigned to it. It's going to search and find all of these. After the parentheses, we are going to type '.each', so each time it finds one of these, we are going to run a function. Beginning and ending parentheses, a semicolon.

Inside of each, we are going to type function() {}. Let's split the function open, and inside of the parentheses after function, we are going to type 'Index'. So we are going to have jQuery count every time it finds one of these items, and it will start from zero for the first one it finds, because computer start counting at zero. So we have four photos here, so they will be numbered 0, 1, 2, and 3.

Each time we find one of these, let's set two variables. Let's set a variable called photoWidth. We are going to set photoWidth equal to the width of the overall marquee, so $('.marquee_container').width();. This is jQuery's way of targeting the marquee container and checking out how wide it is.

Now we know it's 700 pixels because we set it with CSS, but this is a really nice technique because if we ever changed our CSS to a different width value, we wouldn't have to come in here and modify the JavaScript. It would go back and check the CSS setting on that particular HTML element. So let's create one more variable. This is going to be photoPosition, and the photo positions are basically going to line up. So we want to have the very first one start at 00. Then we want to have each one be every 700 pixels, and we are going to use absolute positioning to position the line of photographs.

So we are going to calculate that is we are going to take the index value. I am going to use an asterisk, which is a multiplication symbol, and we are going to multiply index times the photoWidth. So the very first one, 0 times 700 will be 0, 1 times 700 will be 700, 2 times 700 will be 1,400, and 3 times 700 will be 2,100. That will give us each of those X positions all the way across.

So the full width of our photographs four images at 700 will be 2,800 with the leftmost area being 0, 700, 1,400, and 2,100. Now, in the next movie, we'll take these variables, use them to create some HTML, and populate that into the main container.

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