/introduction/newsletter_archive/goodiestogo/article.php/3607241/Goodies-to-Go-Newsletter-389.htm Goodies to Go! Newsletter #389

Goodies to Go! Newsletter #389

By Vince Barnes

                      Goodies to Go (tm)
               May 16, 2006 -- Newsletter # 389
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Featured this week: a
*   Goodies Thoughts - A Little Web History
*   Q & A Goodies
*   Discussion Goodies
*   News Goodies
*   Feedback Goodies
*   Windows Tech Goodie of the Week 
*   And Remember This...

A Little Web History

Have you ever wanted to provide a couple of buttons that would allow a visitor to browse a little around the history of the web pages they visit in your site?  If so, did you know how that could be done?  If not, perhaps you'd be interested in taking a look at JavaScript's history object.

When you open your browser and surf through a few sites, the browser keeps track of where you have been so that you can go back there by using either the "back" button or other navigation techniques the browser may provide.  To keep track, the browser builds a history file.  This file is just a series of links to the URLs you have visited.  In the Internet Explorer (I'm looking at version 6) you can view the contents of the history file either by clicking the history button on the toolbar, by pressing ctrl-h, by selecting View/Explorer Bar/History from the menu hierarchy or by clicking the little down arrow to the right of the "Back" button.  Once you have the history displayed, you can click on any link the revisit that page.

Wouldn't it be nice if you could provide some access to your visitor's history from within your page?  With JavaScript, you can!  JavaScript includes a "history" object.  You can use this object to replicate the functions of the browser's "Back" and "Forward" buttons.  Here's an example (see the note in the Q&A section below about code included in this newsletter):

<.script language="javascript"><./script>
<.form name="form1">
<.input type="button" name="button1"
        value="Go Back 2 Pages"

In this example, I have created a form which contains a single button.  I have set the "onclick" event to use the "go()" method of the "history" object to move back two pages.

The history object also includes "back()" and "forward()" methods to move back and forward single pages.  Of course, before you could move forward, you would have to have moved at least one page backwards.  The "go()' method accepts a number parameter which can be either positive or negative and moves you forward or backward (respectively) the specified number of  pages, as shown in the above example.  You can use the history object's "length" property to find the length of the history list in the browser.

It's easiest to think of uses for the back method, but with some thought you could develop some interesting navigation techniques in your site by using a combination of these methods.

There are also a couple of interesting tricks using the history object.  If the index (the number parameter) of the "go()" method is set to zero like this:
then the current page would be reloaded.  You could also set the index by using something typed in by the user.  The following would use a text field they enter a value into:

If you want to do something like this you would have to be mindful of the types of things a user could enter into the text box.  Some of them may not be too useful for your go() instruction!  You could use a selection list to limit the choices -- as a programmer you always have to be on your toes!

Thanks for reading!

- Vince Barnes


Q & A Goodies
Questions are taken from submissions to our Community
Mentors. You can ask a Mentor a question by going to

X                        X
X   Please take note:    X
X                        X

We have had a number of people indicate that their email client programs are interpreting code examples in this newsletter as actual HTML code instead of text.  To overcome this problem and to enable everyone to read the newsletter, there is a period after the "<" in each tag.  If you cut and paste to try out code examples, please remember to remove the periods.  Wherever we intend you to use "<." in your code, the example will show "<..".  In this way, you will be safely able to use a global edit to change "<." to "<".  Thanks to all of you for your patience with this; if this technique creates an undue problem for you however, please let us know via our feedback address (see Feedback, below).

*** This question was submitted to our Mentor Community.
    The answer was provided by one of our Mentor Volunteers
Q. I would like to be able to create clickable buttons at the top of my page to link to different places further down the page.

A. Add this link code to your button image:
<.a href="#link1"><img src="yourbuttonname.gif"><./a>
Then where you want it to link to, add this anchor code:
<.a name="link1"><./a>
When you click the button it will jump down on the same page to the anchor.

*** This question was submitted to our Mentor Community.
     The answer was provided by one of our Mentor Volunteers
Q. How do I move stuff where I want it on my website? I put the html in the scripts area but when I go to my site everything is in the top left corner.

A. By default, text and images will be placed at the top and to the left. There are tags for positioning, and stylesheets give more control. Sometimes tables are used for precise layout. I suspect tables would be the most useful thing for you right now, so have a look at the tables tutorials. http://www.htmlgoodies.com/tutors/tbl.html

*** This question was submitted to our Mentor Community.
     The answer was provided by one of our Mentor Volunteers
Q. How do I make animated GIFs?.

A. Basically, you make each frame as a separate image, and your graphics application combines them into one file. Imageready can do this. Shareware sites may have Microsoft GIF Animator, which I've used and works adequately. There will be other applications for animating GIFs. Probably shareware sites like Nonags and Tucows are your best bet. If you're willing to learn Flash or Livemotion, they make animations which are smoother and smaller. 

*** This question was submitted to our Mentor Community.
    The answer was provided by one of our Mentor Volunteers

Q. I would like to know the proper approach to run simultaneous javasrcipts such as in the following scenario. I would like a "rain effect" script (called from a .js file) over top my entire web page with underlying rotating images scripts, sliding texts scripts, other animation scripts, etc. ie. items that appear to be rained on. On top of the raining effect, I would to place other javascripts (scripts within or outside of the page coding), animated gifs, picutres, etc. that are "dry" i.e. ...kind of a layering wet/dry senario.

A. When running multiple scripts on one page you need to insure that the different scripts do not use the same variable and/or function names.  If they do then you will have to change those that conflict.  If you need to have multiple scripts start when the page loads the best way I have found is to use
the onLoad event in the BODY tag to call both of them making sure you separate them with a semicolon.
Like this:
<.BODY onLoad="function_one();function_two()">

*** This question was submitted to our Mentor Community.
    The answer was provided by one of our Mentor Volunteers

Q. Do you know of any commands that will not display the password as you type it, or put in a series of asterisks, while still keeping the data so that it can be compared to the values in a database?

A. HTML has a password form field that displays asterisks.
<.input type="password" name="var name" size="40" maxlength="80" value="default value">

Discussion Goodies

Have you seen the discussion forums on the HTML Goodies website?  It's a great place to get help from others who, just like you, are developing web pages.  Many different topics appear in the forum, and a new one will appear if you create it!  Here's a sample of recent topics:

Novice Needs Feedback on Site Implementation:

News Goodies

The Metrics on Blogs
[May 16, 2006] Top blogger Steve Rubel encourages companies to engage the blogosphere but warns that hard metrics are still a work in progress.  
Read the article:

Creative Seeks Bite from Apple's iPod
[May 16, 2006] Rival music player maker wants iPod imports and sales stopped.
Read the article:

Wachovia SOA Married to The Process
[May 16, 2006] The senior vice president described the bank's objectives to a few hundred SOA enthusiasts in New York.
Read the article:

BellSouth Denies NSA Involvement
[May 16, 2006] Telecom giant claims it hasn't turned over phone records in wake of more lawsuits.
Read the article:

W3C Turns Up 'Dial' For Mobile Content
[May 16, 2006] DIAL is a new language to help content creators write mobile software for myriad handheld devices.
Read the article:

IBM Shatters Tape Density Mark
[May 16, 2006] Big Blue finds a way to pack 6.67 billion bits per square inch.
Read the article:

Sun Releases Java EE 5, More Open Source Projects
[May 16, 2006] Among the new open source code is interoperability between Java and Microsoft's .Net framework.
Read the article:

HP's Networking 'Single Pane of Glass'
[May 16, 2006] The company extends ProCurve and adds control over wired and wireless system.
Read the article:

High Court Bounces Buy It Now Injunction
[May 15, 2006] Justices rule eBay may continue to offer service; orders new review of permanent injunction sought by MercExchange.
Read the article:

New Firefox 2.0 Features Line Up For Release
[May 15, 2006] Firefox is delving into features for its new version to keep the browser wars going.
Read the article:

Feedback Goodies

Did you ever wish your newsletter was an easy two way communications medium?  Ploof! It now is!
If you would like to comment on the newsletter or expand/improve on something you have seen in here, you can now send your input to:

We already receive a lot of email every day.  This address helps us sort out those relating specifically to this newsletter from all the rest.  When you send email to this address it may wind up being included in this section of the newsletter, to be shared with your fellow readers.  Please don't send your questions to this address.  They should be sent to our mentors: see http://www.htmlgoodies.com/mentors/

Thanks for all your feedback!

Windows Tech Goodie of the Week 

Visual Studio 2005 Hands-On Tutorial - Part 3

This is the third part in a series of hands-on tutorials that will take you through all the steps to build a complete application using the new Visual Studio 2005 and SQL Server 2005. This part will focus on building a Web interface to the application.

*** AND ***

Dynamically Setting the Page's Title in ASP.NET 2.0

Ths article, by Scott Mitchell, examines how to programmatically set the title of an ASP.NET 2.0 web page; this article also looks at how to automatically set the title based upon the page being visited in the site map.

*** AND ***

Don't Retrieve Data When Using Recordset.AddNew

If the only reason you're creating a Recordset is to add new rows, then why would you retrieve all the existing data first? It seems perfectly logical that doing so is a waste of time, yet I see it done all the time.

And Remember This ...

On this day in...

1092 Lincoln Cathedral (England) was consecrated; 1671 Colonel Thomas Blood attempted to steal the British Crown Jewels; 1899 the lawn mower was patented; 1901 Australia opened its first Parliament, in Melbourne; 1927 the Australian Parliament first convened in its new capitol, Canberra; 1932 Picadilly Circus in London was first lit by electricity; 1949 Prince Rainier III became leader of Monaco; 1962 The Beatles signed their first contract, with EMI Parlophone; 1971 Friends of the Earth returned 1,500 non-returnable bottles to Schweppes; 1977 Patty Hearst was released from jail; 1980 35 motorists died when a Liberian freighter rammed a bridge in Tampa Bay; 1995 Kinshasa, Zaire was quarantined following an outbreak of the Ebola virus;

Born today were: in 1800 abolishionist who led the attack on Harpers Ferry, John Brown; 1860 Scottish novelist Sir James Matthew Barrie (Peter Pan); 1873 English archeologist/Egyptologist Howard Carter (found Tutankhamen's tomb); English dog training expert Barbara Woodhouse; 1913 Admiral John Hayes; 1930 English actress Joan Sims; 1936 actor Albert Finney; 1936 English actress Glenda Jackson; 1946 actress Candace Bergen; 1949 musician Billy Joel; 1962 actor John Corbet;

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