Applying Filters and Transition in DHTML _ Future for You Network!

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Applying Filters and Transition in DHTMLD H T M L D H T M L S C R I P T I N G I N T E R N E T P R O G R A M M I N G

FILTERS & TRANSITION!

Filters and Transition are two

features of DHTML that enable the

programmer to achieve a great variety

of effects, such as:

1. Transitioning between pages

with random dissolves and

horizontal and vertical blinds

2. Converting colored images to

gray in response to a user

action for disabling purpose

3. Glowing some letters for

emphasis

4. Displaying text in three-dimensional appearance using drop shadow effect

Among these two features (filters and transitions), applying filters will result in changes that are

persistent, but transitions are temporary. Transitions allow a user to transfer from one page to another

with a pleasant visual effect such as a random dissolve.

Filters and Transitions are Microsoft Technologies available only in Windows-based versions of

IE 5.5, and are not available in any other browsers. They can be applied to block-level elements such as

div orp, and to in-line elements such as strong orem ifthe element has its height or width CSS

properties set.

Flip Filters: FlipV and FlipH:

The flipv and fliph filters mirror text or images vertically

and horizontally, respectively. Apply these filters to an element by

setting its filterproperty of the style attribute to any one of these

wo filter (flipv or fliph) or both to get the mirror effect. The coding is

as follows:

A Mirrored Text

Fully Mirred

Transparency with the Chroma Filter:

Chroma filter is a filter which is applied to an

image, to make a part of the image transparent to its

background. This filter applies transparency effect to a part

of the image having the color specified in the filter.

Chroma effect can be applied to an element of a

web page using the two properties of the chroma filter:

colorand enabled. The color property specifies the color

of the image for which we apply transparency effect and

he property enabled specifies whether to apply the effect

o the element or not. This effect can be applied to an

image of a web page as follows:

chromaImg.filters(chroma).color = blue;

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chromaImg.filters(chroma) = true;

In this example, if the picture named trans.gif has a portion with a color blue, then that part of

he image will be made transparent so that the element at the back of the image will be visible through

hat image.

Mask Filter:

Mask filter allows an element of a web page to be displayed with a solid background and a

ransparent foreground. Mask filter has a property called color, which specifies the color of the solid

background to the masked image or text. The foreground will have the transparency effect.

Example for the code that applies mask effect to a text displayed on an image using

element is as follows:

Mask Filters

This is a text displayed with the mask effect

Adding Shadow to a Text:

Shadow filter adds depth to your text in order to create a shadowing effect that gives a three-

dimensional appearance to the text. To apply shadowing effect to some text in a

web page, apply the shadow filter to the text with values assigned to its

direction and colorproperties.

The direction property of the shadow filter determines in which direction

he shadow effect is applied this can be set to one of eight directions

expressed in angular notation 0 (up), 45 (above-right), 90 (right), 135 (below-right), 180 (below), 225

(below-right), 270 (left) and 315 (above-right). The color property specifies the color of the shadow of the

ext.

To get the shadowing effect fully, we need to set another style called padding. Increasing the

padding value from 0 to 100 provides greater distance between the text and the border of the element,

allowing the full effect to be displayed. The following is an example code for applying shadowing effect to

a header element in a web page:

A Heading with Shadow

Creating Gradients with Alpha filter:

Gradient is an effect that can

be applied to an image to make it

ransparent to its background in three

different styles: Linear, CircularandTriangular. Linear gradient applies

ransparency effect to an image

gradually from one end to the other

horizontally. Circular gradient gives the

ransparency effect from the centre of

he image as a circle which gradually

fades away as it enlarges.

Triangular gradient gives the

ransparency effect in triangular form. A picture is considered as a rectangle formed using four triangles.

Each triangular area has transparency effect which is very less at the top and gradually increases more

owards bottom. This kind of effect can be applied with the help of three properties of the alpha filter.

They are: Style, Opacity and FinishOpacity.

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About Me

David Livingston J

A software professional turned

academician. Is an assistant

professor in computer science

engineering, teaching egineering

students in colleges affiliated to Anna University.

Has expertise in client server programming,web

programming and enterprise computing. Has been

guiding students to real time projects. This is a

platform through which he shares his knowledge

gained over the years to benefit students who want
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Data Binding with Tabular Data Cot rol (TDC) A Course on Internet Programming

Alpha filter can be applied to the div element, which acts as a container to an image in a web

page. The style property determines in what style the opacity is applied: a value of0 applies uniform

opacity, a value of1 applies a linear gradient, a value of2 applies a circular gradient and a value of3

applies a rectangular gradient.

The Opacity and FinishOpacity properties are both percentages that determine at what

percentage the specified gradient starts and finishes, respectively. The following lines of code illustrate

he application of this filter to an image placed on a div element of a web page:

Creating Motion with Blur:

The blur filter creates an illusion of motion by blurring text or images in a certain direction. It has

hree properties: add, direction and strength, the values of which specify the attributes of the blurring

effect. The add property, when set to tree adds a copy of the original image over the blurred image,

creating a more clear blurring effect.

The direction property determines in which direction the blur filter is applied. This is expressed

in any one of the eight angular vales (0, 45, 90, 135, 180, 225, 270 and 315). The strength property

determines how strong the blurring effect is. The following code implements such effects to a header lineplaced in a div element (block):

This is a header with Blurred effect

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