************************************************************
Future ComputingAs I mentioned last week, today finds me in a hotel room in Las Vegas.
It
’
s
great to be here, and if you have never been here I would highly recommend
that you add it to your
"
to visit
"
list
—
somewhere near the top (right
after Central Florida, perhaps!!)
I went last night to see one the Cirque
Du Soleil shows here and you have never seen one of these sensory
spectaculars then that
’
s another thing to add to your to do list!!
Amazing!!
Apart from the fun, I am actually here for the Citrix iForum conference.
Last week I also talked about the future of the web and how it could be used
to deliver information in ever more complex, complete and convenient ways.
Citrix is all about access
–
access to information and to software.
They
talk about access anywhere, on any device
—
and they can deliver it!
Take
a look at
http://www.citrix.comif you
’
d
like to know more about their product lines.
In his Keynote speech, Citrix CEO Marc Templeton talked about the increase
in the use of web applications versus traditional client-server application
for delivering information in the corporate world.
He cited a report that
predicts that by 2008 more people in that world will be relying on web
applications than client-server applications.
And what does that mean for
you?
It means that if you are studying the skills of web development, you
are studying one of the most in-demand areas of the programming world!
That
means you
’
re on the right track
—
and we at HTML Goodies will be here to
help you in that endeavor.
One of Citrix
’
products is Go To My PC, which they acquired a couple of
years or so ago.
The have developed this into a highly secure, easy to use
remote access solution.
It has quite a wide variety of applications, but
one which stands out as a possibly very useful tool for you is the simple
ability to connect to and take control of your computer from just about
anywhere.
No big deal, you might say, there are lots of solutions for
that.
Consider, however, that Go To My PC works without requiring any
special software to be installed on the computer you are using to access
your machine, and it will work just fine even if your computer is behind a
firewall/router which in turn is sitting on a dynamic IP address connection
(such as most broadband connections.)
Add to that all the security Citrix
has built in and you can start to see what sets this product apart.
I will be writing some more about some of the tools I have seen here
—
Ill
keep you posted!
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
I
’
m stuck on having a page containing a drop-down with options, but I want
to click on my option and go to that place.
A.Here is an example that you can use,
<
html
>
<
head
>
<
title
>
Drop Down
<
/title
>
<
script language=
"
JavaScript
"
>
function LinkUp(selopt)
{
if(selopt!=
"
"
) // if variable is not empty (they selected the first
option)
{
location.href=selopt
}
}
<
/script
>
<
/head
>
<
body
>
<
form name=
"
DropDown
"
>
<
select name=
"
DDlinks
"
onchange=
"
LinkUp(this.options
[
this.selectedIndex
]
.value)
"
>
<
option value=
"
"
>
Select One
<
/option
>
<
option value=
"
http://www.siteone.com
"
>
Site
One
<
/option
>
<
option value=
"
http://www.sitetwo.com
"
>
Site
Two
<
/option
>
<
option value=
"
http://www.sitethree.com
"
>
Site
Three
<
/option
>
<
/select
>
<
/form
>
<
/body
>
<
/html
>
When I have a user enter a number to be used for math it is treated as a
string.
Then when I do math with it the number is added to the end which
makes the answer incorrect.
Can you please give me a method for the user to
be able to enter a number and have it treated like a value instead of a
string?
Or if not, is there a way to convert strings into values?
A.JavaScript interprets a default value given to a text area as a string.
The workaround is to use the eval() function when processing that value as a
number.
If your user inputs a number to a text area in a form, and that
number is to be added, subtracted, mutiplied,
…
etc, process the number
within the eval() function. From your previous example, suppose the user
inputs to the variables a and b via text boxes in a form, you can then add a
to b to return c with this:
c = eval(a+b)
This way, the values in both a and b will be treated as numbers instead of
strings.
I have one more problem with JavaScript programs.
A lot of times I
create variables and then when I try to use them I get an error saying that
they are undefined.
Why is this?
Here is an example of when this happens:
<
SCRIPT LANGUAGE=
"
JavaScript
"
>
function part1()
{
var a = 1;
}
function part2()
{
if (a == 1)
{
document.form.textbox.value =
"
The variable worked, finally!!!
"
;
}
}
<
/SCRIPT
>
<
/HEAD
>
<
BODY
>
<
FORM NAME=
"
form
"
>
<
INPUT TYPE=
"
RADIO
"
NAME=
"
why_doesnt
"
VALUE=
"
the_variable_work
"
onClick=
"
part1();
"
>
<
INPUT TYPE=
"
BUTTON
"
VALUE=
"
Variable work?
"
onClick=
"
part2();
"
>
<
INPUT TYPE=
"
TEXT
"
NAME=
"
textbox
"
VALUE=
"
If the variable worked, a message
would appear here.
"
>
<
/FORM
>
If I write this in a document and click the button, an error message comes
up saying that it is undefined.
I
’
ve tried creating the variable directly
from the event handler, renaming the variable, using checkboxes instead of
radio buttons, and nothing works.
I have tried putting an alert box in the
function and it comes up so I know the function is executing.
It just won
’
t
remember the variable.
A.You are declaring a as a variable from within a function. This makes it a
local variable that is only accessable by that function.
You can make it a
global variable that is accessable by any function by declaring it from
outside any functions, but still between the script tags. Usually global
variables are declared before the first function for the sake of clarity,
but they can be declared from anywhere between the script tags, just not
inside a function. Here
’
s your script with a as a global variable:
<
SCRIPT LANGUAGE=
"
JavaScript
"
>
var a = 0; // declares a as a global variable and initializes it to 0
function part1()
{
a = 1; // the function sets the global variable a to equal 1
}
function part2()
{
if (a == 1)
{
document.form.textbox.value =
"
The variable worked, finally!!!
"
;
}
}
<
/SCRIPT
>
<
/HEAD
>
<
BODY
>
<
FORM NAME=
"
form
"
>
<
INPUT TYPE=
"
RADIO
"
NAME=
"
why_doesnt
"
VALUE=
"
the_variable_work
"
onClick=
"
part1();
"
>
<
INPUT TYPE=
"
BUTTON
"
VALUE=
"
Variable work?
"
onClick=
"
part2();
"
>
<
INPUT TYPE=
"
TEXT
"
NAME=
"
textbox
"
VALUE=
"
If the variable worked, a message
would appear here.
"
>
<
/FORM
>
I
’
m making a website with a
"
fixed
"
background.
I can
’
t figure out how
to make the picture fit the browser perfectly on everybody
’
s system.
Is
there a code I can place inside my document to alter the fixed background to
fit the browser?
My site content will go into a smaller screen/box within
the background so there is no need for scrollers on my outside browser and
my background image doesn
’
t need to be tiled because it basically is my
site.
A.You can use Cascading Style Sheets to fix a background image. The code
would have to be edited for your particular situation and image but here is
the code:
<
style type=
"
text/css
"
>
body {
background-image: url(
"
/images/your_image_name.gif
"
);
background-repeat: no-repeat;
background-attachment: fixed
}
<
/style
>
I am trying to figure out how to make a check box on an HTML form checked
by default.
A.If you want a check box to be checked when the page opens you can do it
without JavaScript like this:
<
input type=
"
checkbox
"
id=
"
ckbox
"
checked
>
With JavaScript you can set the checked property to true when the page loads
like this:
<
script type=
"
text/javascript
"
>
document.form_name.check_box_name.checked=true
<
/script
>
The above will work if there is only one checkbox.
If you have multiple
checkbox
’
s with the same name then you have to specify itslocation in the
array like this:
<
script type=
"
text/javascript
"
>
document.form_name.check_box_name
[
0
]
.checked=true
<
/script
>
The above would set the first checkbox
’
s checked property to true.
I am looking for JavaScript help in order to pre-select a option in a
select field inside a form.
I am using server-side scripting (PHP) in order
to provide the selected value.
A.You could use PHP to create your option tag and select the option you
want that way.
I have a small Help Desk application written in PHP that I
have set up dropdowns to select the date.
I have them default to the
current date.
Here is an example of the dropdown for the
month:
<
select name=
"
beg_req_month
"
>
<
?php
for($i=1;$i
<
=12;$i++)
{
if($i==$prob_month)
"
<
option value=
’
"
. $i .
"
’
selected
>
"
. $i .
"
<
/option
>
n
"
;}
else
"
<
option value=
’
"
. $i .
"
’
>
"
. $i .
"
<
/option
>
n
"
;}
}
?
>
<
/select
>
The variable $prob_month is set to the current month in some previous code.
For Javascript to set the selected option you would use a statement like
this (which sets the first option tag to selected):
document.form_name.select_name.options
[
0
]
.selected=true
[
Beware of the period following the less than symbol in the
"
for
"
statement
above
—
this is one of the periods inserted as a part of the technique
mentioned in the note at the beginning of this section
&
does not belong in
the code you execute
—
Ed.
]
***********************************
Microsoft, RealNetworks End Legal Battle[
October 11, 2005
]
One of the most bitter legal battles in the technology
industry is ending today.
Read the article:
[
October 11, 2005
]
The company releases three critical, four important and
two moderate security bulletins, including one held from last month.
Read the article:
[
October 11, 2005
]
You get loosely coupled data services, according to
Microsoft officials during the VSLive keynote.
Read the article:
[
October 11, 2005
]
A new study claims 80 percent of SMBs think SSL-VPN is
too expensive for them.
Read the article:
[
October 11, 2005
]
UPDATED: The company will build business processes based
on ConnecTerra
’
s RFID offerings.
Read the article:
[
October 11, 2005
]
Firewall vendor Imperva is set to roll out a hardware
solution to a database problem: policing database queries.
Read the article:
[
October 10, 2005
]
Some thirty OEMs plan systems based on latest Intel
dual-core offering, but next year
’
s Bensley platform is more significant
rollout.
Read the article:
[
October 10, 2005
]
A new vendor consortium hopes to ram through its own
high-speed Wi-Fi standard, maybe in less than a year
…
and perhaps at the
cost of the open standards process.
Read the article:
[
October 11, 2005
]
Audio discovery tool comes as study shows RSS becoming
mainstream.
Read the article:
[
October 10, 2005
]
The companies release service offerings for small
businesses.
Read the article:
***********************************
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:
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We already receive a lot of email every day.
This address helps us sort out
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When you
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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
Thanks for all your feedback!
***********************************
Displaying Browser-Friendly RSS FeedsOver the past several years the popularity of website syndication through
XML syndication standards like RSS and ATOM has flourished.
Unfortunately,
the raw XML feeds aren
’
t the most visually appealing things and, when
clicked on by the less tech-savvy user, they can be confusing.
Fortunately
this confusion can be alleviated through the simple use of an XSL stylesheet.
Have you ever wanted to deploy a WinForms application to the web or wished
you could build fancy Flash-based user interfaces easily?
If so, then
Xamlon Web might just be the product for you.
Xamlon Web allows you to
create WinForms applications in C# or VB.NET and deploy them anywhere on the
web using Macromedia Flash without any previous Flash experience.
Basic authentication has gotten a bad reputation over the years.
So it
’
s
not as flexible as forms authentication and not as secure as NT Challenge
Response, it has something going for it that neither of these does
–
it
’
s
basic
–
as in simple!
***********************************
1899Boer War Began
On this day in 1899 war began between the British Empire and the Boers, also
known as Afrikaners, in the Transvaal and Orange Free State in South
Africa.
During the Napoleonic wars, in 1806, Britain took possession of the
Dutch Cape colony of Afrikaners, who were the descendants of the original
Dutch settlers of the area.
The Boers objected to the Anglicization of
South Africa and to Britain
’
s anti-slavery policy, and began to move out
into tribal territories, where they created the Transvaal and the Orange
Free State and for a while, lived in peace with the British.
In 1867 the
discovery of gold and diamonds in the area sparked conflicts.
In 1899 full
scale war began.
For some time the Boers, using Guerilla tactics,
frustrated British efforts.
In 1901 the British began a search and capture
campaign, gathering the families of Boer soldiers into concentration camps.
By 1902 the Boer resistance was defeated and on May 31, 1902, the Peace of
Vereeniging was signed.
In 1910, the British created the autonomous Union
of South Africa, which included the province of the Transvaal, the Orange
Free State, the Cape of Good Hope, and Natal.
Today was also the day that in:
1737300,000 were killed by an
earthquake in Calcutta, India;
1890the Daughters of the American
Revolution was founded;
1923the German Mark fell to 4 billion per
US$ (the paper was more expensive than its face value);
1945the
Chinese Civil War started (Chiang Kai-Shek v Mao Tse-Tung);
1975"
Saturday Night Live
"
premiered with guest host George Carlin;
1981an unknown rocker known only as Prince opened for the Rolling Stones at LA
’
s
Coliseum; 1
983Last hand-cranked telephones US went out of service as
440 telephone customers in Bryant Pond, Maine, were switched over to
direct-dial;
1986Reagan
&
Gorbachev opened talks at a summit in
Reykjavik, Iceland;
1987200,000 gays marched for civil rights in
Washington DC;
1990Center for Urban archaeology opened in NYC at the
South Street Seaport Museum;
1991Anita Hill testified that Clarence
Thomas sexually harassed her;
Born today were: in
1821YMCA founder Sir George Williams (England);
food company founder Henry John Heinz;
1884US First Lady
Eleanor Roosevelt;
1925actress Nancy Guild;
1946actor Felton
Perry;
1948musician Daryl Hall;
1950actress Catlin Adams;
actor David Morse;
1962comedienne Joan Cusak;
1962Leslie Landon;
1971actor Luke Perry;
1975actress Kellie
Martin;
The original home of HTML tutorials. HTMLGoodies is a website dedicated to publishing tutorials that cover every aspect of being a web developer. We cover programming and web development tutorials on languages and technologies such as HTML, JavaScript, and CSS. In addition, our articles cover web frameworks like Angular and React.JS, as well as popular Content Management Systems (CMS) that include WordPress, Drupal, and Joomla. Website development platforms like Shopify, Squarespace, and Wix are also featured. Topics related to solid web design and Internet Marketing also find a home on HTMLGoodies, as we discuss UX/UI Design, Search Engine Optimization (SEO), and web dev best practices.
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