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Adding an image preload plug-in for jQuery

From: Create an Interactive Photo Gallery with jQuery and Dreamweaver

Video: Adding an image preload plug-in for jQuery

Now, when we first started our JavaScript file and hooking jQuery into here, we used this feature called the document ready. But the document ready makes sure that all scripts and all HTML and text are downloaded from a particular web page. What it doesn't do is download images. There are a few ways that we can actually preload images. There's lot of free plug-ins up on line. So the one that I really like is one called far IN space. So in the Final Project folder, in the include, there is a directory called farinspace. And there is a README file in here, and the README file will give you a link to the web site where you can download a copy of this.

Adding an image preload plug-in for jQuery

Now, when we first started our JavaScript file and hooking jQuery into here, we used this feature called the document ready. But the document ready makes sure that all scripts and all HTML and text are downloaded from a particular web page. What it doesn't do is download images. There are a few ways that we can actually preload images. There's lot of free plug-ins up on line. So the one that I really like is one called far IN space. So in the Final Project folder, in the include, there is a directory called farinspace. And there is a README file in here, and the README file will give you a link to the web site where you can download a copy of this.

You can also read about its usage. What I really like about this is it is a plug-in, so that means we simply link to one JavaScript file and we can use a very simple statement, such as .image preload, point to an image or a div containing images, and this script will automatically preload all the images that it sees, and when it's done, it can give us a callback function to tell us that they are all preloaded. So I am going to close this in the browser. So I am simply going to grab the farinspace, I am going to grab the whole folder, and I am just going to drag a copy over to our includes directory in our project.

Once I have done that, let's come over to Dreamweaver. Let's go to the main index page. Let's go into Code view. Let's scroll to the top. Now, this is a jQuery plug-in, so we are going to insert this after the jQuery statement but before our JavaScript statement, since our JavaScript is now going to require jQuery and the image preload. Let's come up to Common. Let's choose Insert Script. Let's go to our myGallery folder > includes > farinspace.

We will grab imgpreload.js. Actually, I am going to grab the minified version. It's a little bit smaller. Click Choose and say OK. Switch back to Design view. File > Save All. Now that we have the preload image in place, I want to add a special effect so that every time you click an image, I want to fade up the picture. But the picture can only fade up if it's already been downloaded, so we are going to add in the preloader, then add in the special effects as well, and we will start all that in the next movie.

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  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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