Home > Articles > Graphics & Web Design > Dreamweaver & Flash

  • Print
  • + Share This
This chapter is from the book

This chapter is from the book

How the Preloader Works

The Preloader is contained in the Home Page movie, which contains three distinct segments. From the CH03-files/CH03-Originals folder on the CD, copy the movie titled homepage.fla to the appropriate folder on your hard drive. Open the movie in the Flash application and test it.

The Preloader exists in the first few frames of the movie inside of the scene titled Preloader. Its job is to make sure all of your content is downloaded before the main section plays. The Preloader employs a script that continually checks to see if all the content in the frames of the main Timeline are present. It also contains a script that moves the green loader graphic to the right as the frames load and sends the value of the percentage of frames loaded to a dynamic text field. When all of the frames are loaded, the play head will go to the Introduction. While the preloading process is taking place, your viewer will see a green load bar graphic fill up its outline and a text field that is updated to read "100%" when all of the frames of your movie have been downloaded. Since you're playing this movie from your hard drive, all of the frames are immediately available and this section will zoom by you in the blink of an eye.

Take a look at the main Timeline of homepage.fla in Flash, and make sure you're in the Preloader scene. You'll see a green graphic load bar and a text message enclosed in a light blue boarder on a gray background. You'll see several layers, but for the purposes of explaining the Preloader, we're only concerned with three of these layers. The top layer is titled Actions and the first keyframe has a stop() action. The layer Loading MC contains the Movie Clip with the Preloader script as well as the green bar and text graphic you see on the Stage. The bottom Temp Background layer contains a graphic symbol that is filled in with gray.

The real action takes place in the Loading MC layer, so lock down all of the others and double-click the green load bar graphic. You'll be in the Timeline for the Loader Main Movie Clip.

This Clip has four layers with two keyframes per layer. The top layer is titled Scripts. The second keyframe contains the code that checks to see if the all of the frames are loaded and gives the play head to go ahead to play the rest of the movie.

Figure 3.14 The Timeline of the Loader Main Movie Clip illustrates the layer structure.

Open the ActionScript panel and click the second keyframe of the top layer. You'll see the following script:

/*
This line of code figures out how many frames 
have loaded out of the total number of frames.
Then it multiplies that number by 100, to get an accurate percentage.
*/

loaded = int((_root._framesloaded/_root._totalframes)*100);

/*
This line of code puts the variable "loaded" and "%" into the field
named "percentage".
*/

percentage = loaded add "%";

/*
This line of code sets the x scale of the movie clip "Bar" to the current number
in the variable, "loaded". This is so the loading bar will accuratly represent 
the total percentage loaded.
*/

setProperty ("Bar", _xscale, loaded);

/*
This code sends the play head on the main timeline to the frame labled,"loadDone", 
if the movie has completly loaded.
Or if the movie has not loaded yet, it sends the play head to back to the
previus frame, based on its current position.
*/

if (Number(loaded) == 100) {
	_root.gotoAndPlay ("loadDone");
} else {
	_root.gotoAndPlay (_currentframe -1);
}

While you won't need to alter this code, it's good to know what it does so that you understand what you can and can't safely alter in the preloader section. In simple terms, this is an if-then statement. When you invoke the statement, Flash checks to see whether all the frames are loaded. If they aren't, the Clip loops back to the first frame and waits to see whether the "all frames loaded" condition is true the next time around. While Flash is performing the frames loaded function, another script is feeding the variable named percentage to the dynamic text field. There is also a script that is tweening an instance of the Movie Clip SliderMax (named Bar) on the X axis so that as the frames load the green load bar will move to the right and fill the black outline. These scripts refer to specific variable and instance names so you must make sure that you don't alter an instance of a symbol on the Stage in a way that will interfere with the script doing it's job, such as deleting an instance and replacing it with one of your own. If you're familiar with the intricacies of ActionScripting, you can alter the code to reflect an alternate design; if not, it's best to follow the instructions as to how to alter the elements listed in the sections titled Background, Text Fields and Green Load Bar Graphic.

  • + Share This
  • 🔖 Save To Your Account

InformIT Promotional Mailings & Special Offers

I would like to receive exclusive offers and hear about products from InformIT and its family of brands. I can unsubscribe at any time.

Overview


Pearson Education, Inc., 221 River Street, Hoboken, New Jersey 07030, (Pearson) presents this site to provide information about products and services that can be purchased through this site.

This privacy notice provides an overview of our commitment to privacy and describes how we collect, protect, use and share personal information collected through this site. Please note that other Pearson websites and online products and services have their own separate privacy policies.

Collection and Use of Information


To conduct business and deliver products and services, Pearson collects and uses personal information in several ways in connection with this site, including:

Questions and Inquiries

For inquiries and questions, we collect the inquiry or question, together with name, contact details (email address, phone number and mailing address) and any other additional information voluntarily submitted to us through a Contact Us form or an email. We use this information to address the inquiry and respond to the question.

Online Store

For orders and purchases placed through our online store on this site, we collect order details, name, institution name and address (if applicable), email address, phone number, shipping and billing addresses, credit/debit card information, shipping options and any instructions. We use this information to complete transactions, fulfill orders, communicate with individuals placing orders or visiting the online store, and for related purposes.

Surveys

Pearson may offer opportunities to provide feedback or participate in surveys, including surveys evaluating Pearson products, services or sites. Participation is voluntary. Pearson collects information requested in the survey questions and uses the information to evaluate, support, maintain and improve products, services or sites, develop new products and services, conduct educational research and for other purposes specified in the survey.

Contests and Drawings

Occasionally, we may sponsor a contest or drawing. Participation is optional. Pearson collects name, contact information and other information specified on the entry form for the contest or drawing to conduct the contest or drawing. Pearson may collect additional personal information from the winners of a contest or drawing in order to award the prize and for tax reporting purposes, as required by law.

Newsletters

If you have elected to receive email newsletters or promotional mailings and special offers but want to unsubscribe, simply email information@informit.com.

Service Announcements

On rare occasions it is necessary to send out a strictly service related announcement. For instance, if our service is temporarily suspended for maintenance we might send users an email. Generally, users may not opt-out of these communications, though they can deactivate their account information. However, these communications are not promotional in nature.

Customer Service

We communicate with users on a regular basis to provide requested services and in regard to issues relating to their account we reply via email or phone in accordance with the users' wishes when a user submits their information through our Contact Us form.

Other Collection and Use of Information


Application and System Logs

Pearson automatically collects log data to help ensure the delivery, availability and security of this site. Log data may include technical information about how a user or visitor connected to this site, such as browser type, type of computer/device, operating system, internet service provider and IP address. We use this information for support purposes and to monitor the health of the site, identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents and appropriately scale computing resources.

Web Analytics

Pearson may use third party web trend analytical services, including Google Analytics, to collect visitor information, such as IP addresses, browser types, referring pages, pages visited and time spent on a particular site. While these analytical services collect and report information on an anonymous basis, they may use cookies to gather web trend information. The information gathered may enable Pearson (but not the third party web trend services) to link information with application and system log data. Pearson uses this information for system administration and to identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents, appropriately scale computing resources and otherwise support and deliver this site and its services.

Cookies and Related Technologies

This site uses cookies and similar technologies to personalize content, measure traffic patterns, control security, track use and access of information on this site, and provide interest-based messages and advertising. Users can manage and block the use of cookies through their browser. Disabling or blocking certain cookies may limit the functionality of this site.

Do Not Track

This site currently does not respond to Do Not Track signals.

Security


Pearson uses appropriate physical, administrative and technical security measures to protect personal information from unauthorized access, use and disclosure.

Children


This site is not directed to children under the age of 13.

Marketing


Pearson may send or direct marketing communications to users, provided that

  • Pearson will not use personal information collected or processed as a K-12 school service provider for the purpose of directed or targeted advertising.
  • Such marketing is consistent with applicable law and Pearson's legal obligations.
  • Pearson will not knowingly direct or send marketing communications to an individual who has expressed a preference not to receive marketing.
  • Where required by applicable law, express or implied consent to marketing exists and has not been withdrawn.

Pearson may provide personal information to a third party service provider on a restricted basis to provide marketing solely on behalf of Pearson or an affiliate or customer for whom Pearson is a service provider. Marketing preferences may be changed at any time.

Correcting/Updating Personal Information


If a user's personally identifiable information changes (such as your postal address or email address), we provide a way to correct or update that user's personal data provided to us. This can be done on the Account page. If a user no longer desires our service and desires to delete his or her account, please contact us at customer-service@informit.com and we will process the deletion of a user's account.

Choice/Opt-out


Users can always make an informed choice as to whether they should proceed with certain services offered by InformIT. If you choose to remove yourself from our mailing list(s) simply visit the following page and uncheck any communication you no longer want to receive: www.informit.com/u.aspx.

Sale of Personal Information


Pearson does not rent or sell personal information in exchange for any payment of money.

While Pearson does not sell personal information, as defined in Nevada law, Nevada residents may email a request for no sale of their personal information to NevadaDesignatedRequest@pearson.com.

Supplemental Privacy Statement for California Residents


California residents should read our Supplemental privacy statement for California residents in conjunction with this Privacy Notice. The Supplemental privacy statement for California residents explains Pearson's commitment to comply with California law and applies to personal information of California residents collected in connection with this site and the Services.

Sharing and Disclosure


Pearson may disclose personal information, as follows:

  • As required by law.
  • With the consent of the individual (or their parent, if the individual is a minor)
  • In response to a subpoena, court order or legal process, to the extent permitted or required by law
  • To protect the security and safety of individuals, data, assets and systems, consistent with applicable law
  • In connection the sale, joint venture or other transfer of some or all of its company or assets, subject to the provisions of this Privacy Notice
  • To investigate or address actual or suspected fraud or other illegal activities
  • To exercise its legal rights, including enforcement of the Terms of Use for this site or another contract
  • To affiliated Pearson companies and other companies and organizations who perform work for Pearson and are obligated to protect the privacy of personal information consistent with this Privacy Notice
  • To a school, organization, company or government agency, where Pearson collects or processes the personal information in a school setting or on behalf of such organization, company or government agency.

Links


This web site contains links to other sites. Please be aware that we are not responsible for the privacy practices of such other sites. We encourage our users to be aware when they leave our site and to read the privacy statements of each and every web site that collects Personal Information. This privacy statement applies solely to information collected by this web site.

Requests and Contact


Please contact us about this Privacy Notice or if you have any requests or questions relating to the privacy of your personal information.

Changes to this Privacy Notice


We may revise this Privacy Notice through an updated posting. We will identify the effective date of the revision in the posting. Often, updates are made to provide greater clarity or to comply with changes in regulatory requirements. If the updates involve material changes to the collection, protection, use or disclosure of Personal Information, Pearson will provide notice of the change through a conspicuous notice on this site or other appropriate way. Continued use of the site after the effective date of a posted revision evidences acceptance. Please contact us if you have questions or concerns about the Privacy Notice or any objection to any revisions.

Last Update: November 17, 2020