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Set a Marquee to Autoplay with jQuery and Dreamweaver

Modifying existing JavaScript


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Set a Marquee to Autoplay with jQuery and Dreamweaver

with Chris Converse

Video: Modifying existing JavaScript

Now that we've got the global variable set up, what we want to do now is set the totalPanels based on the total number of panels that the marquee has. Now we do that already in the navigation links when we generate the navigation links from the previous course. So inside of here we have a jQuery statement under the Generate Navigation links comment. That goes through and find every time there's a individual panel inside of the marquee_panels container and we generate a navigation item. We're going to come into this same function inside up here after we generate the navigation item.

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Set a Marquee to Autoplay with jQuery and Dreamweaver
38m 22s Intermediate Jun 21, 2011

Viewers: in countries Watching now:

This course, which builds on the foundations of Create an Interactive Homepage Marquee with jQuery and Dreamweaver, enhances the marquee with an auto-play feature that automatically advances through the slide images when the page is loaded. Working in a Dreamweaver environment, Chris Converse shows how to add auto play using a combination of HTML, CSS, and JavaScript, plus the implementation of hover states in jQuery. This course also covers adding play/pause functionality, as well as an interaction timeout, which will restart the marquee after a specified period of idle time.

Topics include:
  • Previewing a project across browsers and devices
  • Updating CSS and HTML in Dreamweaver
  • Adding debugging code
  • Declaring variables in JavaScript
  • Using setInterval
  • Stopping auto play during user interaction
Subjects:
Web Web Design Projects
Software:
Dreamweaver jQuery
Author:
Chris Converse

Modifying existing JavaScript

Now that we've got the global variable set up, what we want to do now is set the totalPanels based on the total number of panels that the marquee has. Now we do that already in the navigation links when we generate the navigation links from the previous course. So inside of here we have a jQuery statement under the Generate Navigation links comment. That goes through and find every time there's a individual panel inside of the marquee_panels container and we generate a navigation item. We're going to come into this same function inside up here after we generate the navigation item.

We're going to hit Return, we're going to type window.totalPanels, and we're going to set that equal to the index+1;. The index is the number of times this item is running based on how many times it finds each of the marquee panels, and we're going to add one to it since the index automatically starts at zero. So we want to take the zero and add 1 to it and then we're going to add all the numbers. So four items, instead of going from 0 to 3, we'll go from 1 to 4.

Next we're going to update the debugger within the same function. So let's come up to one of the lines above. Copy one of these debugger statements. Command+C or Ctrl+C to copy, Command+V or Ctrl+V to paste, and we're going to replace totalPanels into the item that's being modified here. So we're going to set totalPanels. html equal to the string literal of totalPanels plus the value of window.totalPanels. Next we're going to scroll down to the script and look for the setup navigation links. This is where we control what happens when some actually clicks on these links.

We have a whole bunch of variables that we've setup inside up here, again from the previous course. So after newCaption we're going to come in here, we're going to hit Return, and then here we're going to set the window.currentPanel, and we are going to set this equal to, and we're going to lock onto a previous variable that we already set. We've up here navClicked. Let me just double-click and copy that. So navClicked equals this index. So when this script actually runs, we know which navigation item was clicked on.

So we're going to use the navClicked variable. So let's comedown under window.currentPanel= navClicked and let's add 1 to this as well. Let's hit Return. Let's scroll up and grab one of those debug lines of code, copy that to the clipboard, and let's come down to the next line and hit Paste. Let's double-click currentPanel and let's replace that into the debugger line on all three spots.

So now each time a navigation item is clicked, we're going to be modifying the currentPanel as well. Let's choose File > Save All to make sure we've saved all of the HTML, CSS, and JavaScript files. Let's click over to Index and then let's choose File > Preview in Browser. I'll hit Reload. We can see all the debugger code showing up here, the autoPlay variable, currentPanel, totalPanels, timePassed, and timeToChange. The autoPlay is set to True and currentPanel is on 1.

If I come up to the navigation and click on another panel, notice that currentPanel is now switched to 2. So as I interact now with the navigation, that variable is being sent over to that currentPanel variable. Now that we have all our global variables in place, in the next movie we'll create some custom functions to make the marquee play by itself.

Find answers to the most frequently asked questions about Set a Marquee to Autoplay with jQuery and Dreamweaver.


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Q: This course was updated in April, 2013. What changed?
A: Since the release of this course, Chrome conflicts with jQuery 1.6, and browsers run the autoplay when the windows is not in focus. To remedy these issues, the author has added a movie to Chapter 5 that will show you how to:
- Update the version of jQuery
- Detect the focus state of a web window
- Create a compound conditional JavaScript statement
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