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Will explain the code in fragments

I will explain the code for this Flex application in fragments. A complete listing of the application is provided in Listing 6 near the end of thelesson.

Beginning of XML code for SliderChangeEvent01

The primary purpose of this application is to illustrate the use of inline event handling for Flex 3 slider change events.

The application begins in Listing 2 which shows the beginning of the Application element and the two complete Label elements shown at the top of Figure 1.

Beginning of xml code for sliderchangeevent01.

<?xml version="1.0" encoding="utf-8"?><mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"><mx:Label text="Put your name here" fontSize="16" fontWeight="bold"/><mx:Label text="Image Height in Pixels" fontWeight="bold" fontSize="14"/>

Make it easy - drag and drop

The two Label elements were created by dragging Label controls from the Components tab shown in Figure 4 onto the Design tab shown in Figure 5. Then the attribute values were set using the Flex Properties tab shown in Figure 6.

The attributes shown in Listing 2 represent common properties of a text label and shouldn't require further explanation.

Create and condition the slider

Listing 3 adds a horizontal slider (HSlider) control to the application and sets the attributes that control both its appearance and itsbehavior.

Create and condition the slider.

<mx:HSlider minimum="100" maximum="250" value="250" toolTip="Height"change="myimg.height=event.currentTarget.value" liveDragging="true" />

The slider is a little more complicated than a label and deserves a more thorough explanation.

The numeric properties

Recall that a slider represents a range of numeric values. The position of the thumb at any instant in time selects a value from that range. Thefollowing three attributes shown in Listing 3 deal with the slider and its numeric range:

  • minimum - the numeric value represented by the left end of a horizontal slider.
  • maximum - the value represented by the right end of a horizontal slider.
  • value - the value that specifies the initial position of the thumb when the slider is constructed and first presented in the application'swindow.

The toolTip property

As you have probably already guessed, the value of the toolTip property specifies the text that appears in the tool tip when it is visible as shown in Figure 2.

The change property

This is where thing get a little more interesting. As the user moves the thumb to the left or right, the slider fires a continuous stream of change events. You might think of this as the slider yelling out "Hey, the position of my thumb has been changed." over and over as the thumb is being moved. (Also see the discussion of the liveDragging property later.)

An event handler

The value that is assigned to the change attribute in Listing 3 is often referred to as an event handler . This value specifies what the application will do each time the slider fires a change event.

Three ways to handle events in Flex

Questions & Answers

can someone help me with some logarithmic and exponential equations.
Jeffrey Reply
sure. what is your question?
ninjadapaul
20/(×-6^2)
Salomon
okay, so you have 6 raised to the power of 2. what is that part of your answer
ninjadapaul
I don't understand what the A with approx sign and the boxed x mean
ninjadapaul
it think it's written 20/(X-6)^2 so it's 20 divided by X-6 squared
Salomon
I'm not sure why it wrote it the other way
Salomon
I got X =-6
Salomon
ok. so take the square root of both sides, now you have plus or minus the square root of 20= x-6
ninjadapaul
oops. ignore that.
ninjadapaul
so you not have an equal sign anywhere in the original equation?
ninjadapaul
Commplementary angles
Idrissa Reply
hello
Sherica
im all ears I need to learn
Sherica
right! what he said ⤴⤴⤴
Tamia
what is a good calculator for all algebra; would a Casio fx 260 work with all algebra equations? please name the cheapest, thanks.
Kevin Reply
a perfect square v²+2v+_
Dearan Reply
kkk nice
Abdirahman Reply
algebra 2 Inequalities:If equation 2 = 0 it is an open set?
Kim Reply
or infinite solutions?
Kim
The answer is neither. The function, 2 = 0 cannot exist. Hence, the function is undefined.
Al
y=10×
Embra Reply
if |A| not equal to 0 and order of A is n prove that adj (adj A = |A|
Nancy Reply
rolling four fair dice and getting an even number an all four dice
ramon Reply
Kristine 2*2*2=8
Bridget Reply
Differences Between Laspeyres and Paasche Indices
Emedobi Reply
No. 7x -4y is simplified from 4x + (3y + 3x) -7y
Mary Reply
is it 3×y ?
Joan Reply
J, combine like terms 7x-4y
Bridget Reply
im not good at math so would this help me
Rachael Reply
yes
Asali
I'm not good at math so would you help me
Samantha
what is the problem that i will help you to self with?
Asali
how do you translate this in Algebraic Expressions
linda Reply
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
bamidele Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Introduction to xml. OpenStax CNX. Dec 02, 2014 Download for free at https://legacy.cnx.org/content/col11207/1.18
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