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1 Fading Elements with JQuery The fade effect is when an element fades out by becoming increasingly transparent over time until it disappears or fades in by becoming decreasingly opaque over time until it become completely visible. JQuery also allows you to partially fade an element, making it semitransparent. Fading in To make an element fade in, it should be hidden first. this can be done by Setting the style attribute of the element to display=none. To follow along with these exercises, you need an image in the images directory that you are using to test your code. Name this image big.gif. To make an element appear to fade in, follow these steps: 1. Create a Web page containing the following code: html head title My Test Page / title script src ="jquery min.js" type

2 ="text/javascript"/ script script type ="text/javascript" document).ready( / script / head body div style =" display : none"

3 img src ="kis.jpg" // div input value ="Fade In" type ="submit" / body / html This code contains a button and an image inside a hidden div element. 2. Save the file, and then view it in your browser. The image doesn t appear

4 3. Add the following JQuery for fadein effect ':submit' ).click( 'div').fadein(); The code says, when the button is clicked, everything in the div should fade in. 4. Save this file, and then view it in your browser. Click the button again. The image in the hidden div element fades in

5 5. Setting the speed of the fade-in effect 'div' ).fadein( "fast" ); With any jquery effect, we can use one of three speeds: slow, normal, and fast. Using. fadein ('slow') would make the fadein effect complete in.6 seconds,. fadein ('normal') in.4 seconds, and. fadein ('fast') in.2 seconds. Now when you save and reload this file in your browser and click the button, the fade in

6 effect occurs more quickly. Fading out The fade out effect takes a visible element and hides it by making it appear to fade out. To make an element disappear on a page using the fade out effect, follow these steps: 6. Add the code for the fadeout effect as follows: ':submit' ).click( 'div' ).fadeout(); The code says, when the button is clicked, everything in the div should fade out. 7. Save this file, and then reload it in your browser. Click the button. The image in the div element fades out Partial fading JQuery also allows an element to fade partially and become partially transparent. The syntax is: fadeto(speed, percent, [callback]); The percent is expressed as a decimal and is used to control how much to fade out the element. For example, if you want to make something fade out 25 percent, you use.25

7 to denote 25 percent 8. Add the following jquery code for faedto effect '#FadeTo' ).click( 'div' ).fadeto( 'slow',.25); The code says, When the button with id FadeTo is clicked, everything in the div element should be faded out 25 percent. 9. Save this file, and then view it in your browser. Click the button. The image in the div element appears to 25 percent transparent.

8 So, in this demo, we have seen different fading s of jquery 10. We can also have callback to the Fadein, Fadeout or FadeTo events. Callback s are s which will be executed when the events have completed. For Ex: we can have a callback to alert the user that hiding event is completed. '#FadeTo' ).click( 'div' ).fadeto( 'slow',.25,

9 alert( 'Div Element is faded to 25 Percent'); So, three different effects s be summarized as follows: Function fadeout (speed, callback) Parameter speed (Number String) Specifies the duration of the effect as a num milliseconds or as one of the predefined strings: slow, normal, or fa omitted, the default is normal. callback (Function) An optional the animation completes. No parameters are passed to this, but the context (this) is set to the element that was animated. fadein (speed, callback) Same as above fadeto (speed, callback) Same as above here

HTML5 and CSS3 The jquery Library Page 1

HTML5 and CSS3 The jquery Library Page 1 1 HTML5 and CSS3 THE JQUERY LIBRARY 8 4 5 7 10 11 12 jquery1.htm Browser Compatibility jquery should work on all browsers The solution to cross-browser issues is