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0 C O M M E N T S
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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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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