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: Generating the photo lineup

Now, the next thing we need to do is write the image tags that are going to be inside of the marquee_photos div. So if we bring the sketch back up real quick, what we'll see is we have that main container that holds all the photos. In each photo, inside of its parent is going to have to be positioned at each of those 700 marks, because the width of each photo is 700. So again, we're going to go 0, 700, 1,400, and 2,100 and then the width of 700 multiplied out will give us a full width of 2,800.

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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

Generating the photo lineup

Now, the next thing we need to do is write the image tags that are going to be inside of the marquee_photos div. So if we bring the sketch back up real quick, what we'll see is we have that main container that holds all the photos. In each photo, inside of its parent is going to have to be positioned at each of those 700 marks, because the width of each photo is 700. So again, we're going to go 0, 700, 1,400, and 2,100 and then the width of 700 multiplied out will give us a full width of 2,800.

So back in our JavaScript file, what we're going to do here, now that we have our two variables set up, is we're going to actually write in the HTML and add it to the marquee photos div. So to start that, let's go on the next line. Inside of our script, let's start with a $('.marquee_photos'). Inside of that div, we are going to come out into the parentheses and type 'append'.

This is jQuery's function for adding in HTML into an object, ();. Inside of the append we're basically going to write an image tag. I'll put two tick marks. I am also going to move my text editor up here a little bit. Inside of the string literal inside of append, I'm going to type 'img class='.

Let's give it our CSS class, marquee_photo, space, add style attribute, style=' '. Let's just put an x in there for the moment, src=' '. We'll put an x, alt=' '. We'll put an x, width=' '.

We'll put an x, height= '350'. [00:02147.47] Next, we'll do a /> to close the tag. So basically, we are just writing out an image tag. Now we want to go back and change these Xs for actual variable values up here. So under style, we want to set the left attribute of the style to be whatever the photo position is. So again, the first one that runs, index is 0, times 700 will be 0.

So we're going to want to set a left, put a colon, and then inside here, we need to put a variable. So we're going to put a tick mark, two Plus signs and then another tick mark. So we're basically ending the first string literal from here to here and then adding in a variable. So let's come up here and grab photoPosition, Command+C or Ctrl+C to copy, Command+V or Ctrl+V to paste. So style="left is going to equal whatever photoPosition is.

The source, the actual file name path that to the JPEG that we're going to be using, we're going to go get that from the actual element that we just found, which is found under this each statement. So I've set to the x here, let's have a '++'. And we're going to put a jQuery statement in here, $ (). This, which is the object that's been found while we're running through this looping statement of the each .attr().

Inside of there, we're going to put the string literal to search. We're going to search for the attribute called src. So when it finds each photo, it will find the source of the photo it found. So in this case src= "image/photos/london will be found and replaced into here as well. For the alt text, '++'. We're going to do the same thing '$(this).attr(' '). We are going to go grab the alt text as well.

So each time we write in these images, we will get an alt text and the image source. For the width '++'. We're going to add photoWidth as the variable here. The last thing we need to do on the next line, we need to set the overall width of the marquee_photos, so that it's wide enough to hold the absolute position of all of the different elements, and our marquee will know how many photos and how wide the whole marquee_photo now is.

We've just added four pictures in there. So let's add a $('.marquee_photos').css. We're going to add CSS attributes, ();, inside ('width', photoPosition+photoWidth).

So photoPosition is 2100, but that last photo is 700 pixels wide, so we're going to add the photoWidth, and this is going to give us a total of 2800. So now jQuery knows the marquee_photos now has to be 2800 pixels wide to hold the four images inside that are absolute positioned from 0 up to 2100. At this point, we're finished generating the photo lineup. Let's get rid of some of this negative space, and then in next movie we'll generate the navigation links.

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