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Overriding the browser's default link behavior

From: Create an Interactive Photo Gallery with jQuery and Dreamweaver

Video: Overriding the browser's default link behavior

Now, I am going to want to edit my JavaScript file in a separate window, in a separate text editor, so we can see Dreamweaver in the background. So I am going to close that. In the index file, I am going to switch over to Code view. I am going to move my anchor tag code up here to the very top, so I can see it. I am going to switch back out into my OS, and I am going to open gallery.js in the text editor. My text editor of choice is Coda, and you can edit this JavaScript file in any HTML editor, or in Dreamweaver.

Overriding the browser's default link behavior

Now, I am going to want to edit my JavaScript file in a separate window, in a separate text editor, so we can see Dreamweaver in the background. So I am going to close that. In the index file, I am going to switch over to Code view. I am going to move my anchor tag code up here to the very top, so I can see it. I am going to switch back out into my OS, and I am going to open gallery.js in the text editor. My text editor of choice is Coda, and you can edit this JavaScript file in any HTML editor, or in Dreamweaver.

So, I want to edit my script in a separate window in a separate application, so I can see the code in the background of what I'm actually going to be targeting with my JavaScript and jQuery statements. So, inside of our JavaScript document, let's start by adding our document ready function. We will start with a Dollar sign, which is jQuery's way of initiating the functions in the jQuery file we downloaded. Type document. Outside of the parentheses, we will type ready. Beginning and ending parentheses, semicolon.

Inside the ready, we're going to type function, beginning and ending parentheses, beginning and ending bracket. Then we are going to split the brackets. Anything happening inside of here is going to run after jQuery has downloaded all of the HTML code in the page. So, the first thing we want to do is start by targeting all of the anchor tags that are inside of the gallery thumbnails div. Start with the Dollar sign, beginning and ending parentheses, two tick marks for string literal.

I am going to type gallery_thumbnails space a, come outside of the parentheses .click, beginning and ending parentheses here, semicolon. Now, we are adding a click event to all of the anchor tags. Inside of here, we are going to type function, beginning and ending parentheses. Inside of the parentheses, we are going to put a lowercase e.

This is going to capture the event that actually started the click. Beginning and ending bracket and let's split this function. The first instruction inside of the function on the click event for every one of the anchor tags, we are going to type e.preventDefault, beginning and ending parentheses, and a semicolon. This tells the browser to ignore the default behavior that it would do on an anchor link, which in this case so far has been when we click on a thumbnail, the entire page shifts over to the high-resolution thumbnail.

So we are going to tell the browser to not do its basic function on an anchor tag. And then what we want to do is let's set the states of the thumbnails. So, let's start by copying the statement, come down here, Command+V or Ctrl+V to paste, so gallery_thumbnails a. We are going to go through all of these. I am going to type 'removeClass' and put a string literal inside of the parentheses, called selected.

We are going to make sure that none of the anchor tags have the selected class assigned to them. On the next line, let's paste that same statement again. We are going to say all of the anchor tags .children.CSS, beginning and ending parentheses, semicolon. Inside of here, we are going to do one string literal. We are going to type 'opacity' then a comma, then a second string literal and the number 1.

So, we are basically going to add CSS properties to all of the thumbnails, setting the children, the image tag inside of the anchor tag, with an opacity of 1. Add a few more lines. Then we are going to say Dollar sign parentheses, this, which is whatever the item is that was actually clicked on. We are going to say addClass, string literal, selected, and hit Return, Dollar sign this .Children.CSS, beginning and ending parentheses, semicolon, two tick marks for string literal opacity, two tick marks .4, for 40% opacity.

Let's say File > Save. Let's make sure all of our files are saved in Dreamweaver. Choose Save All. Then we are going to come out to the OS. We are going to grab this index file and open it up in a browser. Hit Reload. Now, when I roll over these items, I see the rollover state. When I click on them, whatever item I click on, the border turns white from the selected class we created earlier, and the image inside gets 40% transparent.

Now, with our thumbnails fully functional, let's start on the preview area.

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This video is part of

Expand all | Collapse all
  1. 7m 51s
    1. Previewing the project across browsers and devices
      5m 32s
    2. About the exercise files
      2m 19s
  2. 9m 49s
    1. Renaming a series of files in Adobe Bridge
      3m 7s
    2. Using GREP for more intricate file renaming
      6m 42s
  3. 29m 5s
    1. Creating and linking HTML and CSS files
      1m 32s
    2. Save For Web & Devices in Photoshop
      7m 2s
    3. Creating empty CSS rules
      3m 55s
    4. Create, nest, and class DIV tags
      6m 0s
    5. Adding CSS properties for main container
      4m 0s
    6. Adding CSS properties for content area
      4m 28s
    7. Adding CSS properties for headings
      2m 8s
  4. 15m 55s
    1. Adding and linking the thumbnail images
      2m 32s
    2. Styling the thumbnail links with CSS
      5m 15s
    3. Downloading and adding jQuery to your project
      2m 42s
    4. Overriding the browser's default link behavior
      5m 26s
  5. 11m 10s
    1. Creating preview images from anchor links
      1m 52s
    2. Changing the preview when clicking thumbnails
      5m 59s
    3. Changing the caption when clicking thumbnails
      3m 19s
  6. 12m 0s
    1. Adding an image preload plug-in for jQuery
      2m 22s
    2. Setting a dissolve transition between previews
      4m 31s
    3. Implementing the preload functionality
      5m 7s
  7. 15m 20s
    1. Adding a lightbox plug-in for jQuery
      2m 2s
    2. Creating a custom function for lightbox properties
      7m 38s
    3. Setting links to activate the lightbox feature
      5m 40s
  8. 3m 40s
    1. Initializing the gallery on page load
      3m 40s
  9. 5m 11s
    1. Adding icons and styles to the zoom and contact links
      5m 11s
  10. 2m 41s
    1. Activating a gallery automatically in IE9 and IE10
      2m 41s
  11. 2m 43s
    1. Some ideas for further enhancements
      2m 43s

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