Adding Animation to Web Page Part-2: jQuery Effects

JQuery library have all the effects for adding animation as discussed in earlier article. How to show or hide an element, sliding effects on an element or perform any custom animation on web-page have been discussed in my previous discussion.

Wherever these function didn’t work on the page then there may be some script error or you are defining the function with wrong syntax. Whatever the error be, jQuery library is there for help any type of definition, syntaxes or any example.

User can apply fading on an element, and make that element out of visibility, by using below functions specially created for this functionality. Reading an element’s description and do some practical with them are two different tasks. So just read and perform practical to clarify all these effects.

• fadeIn(): used to fade in a hidden element on the web-page.
• fadeOut(): used to fade out a hidden element on the web-page.
• fadeTo(): allows fading to a given opacity.
• fadeToggle(): used to toggle between fadeIn() and fadeOut() methods alternatively.

These methods have some parameters like speed, callback and opacity as per their requirements. Below are the examples for above methods:

$(".divEmployee").fadeIn(“slow”); or $(".divEmployee").fadeIn(4500);
$(".divEmployee").fadeOut(“slow”); or $(".divEmployee").fadeOut(4500);
$(".divEmployee"). fadeToggle (“slow”); or $(".divEmployee"). fadeToggle (4500);
$(".divEmployee"). fadeTo("slow",0.5);

Stop()

This method is used to stop all the effects before it is finished and revert back to the previous stage. It can work with all effects function e.g. hide/show, slideDown/slideUp, fadeIn/fadeOut or any custom animation.

$(".divEmployee").stop();

This function will stop the effect applied on specified element and revert back. If the element is hidden and perform a show() function then it will stop and make that hidden back.

Stop() function may take two parameters stopAll (to clear animation queue, default it will only stop the active animation) and goToEnd (to specify whether complete the current animation or not).

We will discuss about callback feature of these functions means what to do after animation has finished.

Adding Animation to Web Page: jQuery Effects

JQuery library have all the effects for adding animation user can imagine/think about like to animate, fade, toggle, show, hide and etc. All these animation have their own functions according to their job.

jQuery methods allow users to easily use these effects with minimum configuration. In other context we can show or hide any element on the page by using these effects to make better UI. These animation can be done in any event of an existing element. I have listed some of these methods including a brief description:

• hide(): will hide the related element.
• show(): will show related element.
• toggle(): show of hide related element. (If element is shown then it will hide)
• slideDown()/slideUp(): show or hide related element with sliding motion.
• slideToggle(): show of hide related element with sliding motion.
• animate(): this method is used for custom animation.

These methods have also some parameter to be used with e.g. speed (represents predefined speed among slow, normal and fast) and callback (optional - represent a function to be executed after animation completion). Whether the parameter is required or optional is function dependent, may be change in other definition.

$(“#button”).hide(1000); will hide the button as per the given speed
$(“#button”).show(1000); will show the button as per the given speed

Consider following code:

$(".divEmployee").toggle('slow', function(){
             $(".txtMessage").text(successfully done');
          });

It will show/hide the whole div tag and after completion given message will show on the element provided. Following are some examples about how to use these animation methods. Write these according to element on you page and look out the effects.

$(".divEmployee").slideDown('slow');
$(".divEmployee").slideUp('slow');
$(".divEmployee").slideToggle('slow');

The custom animation animate() method will require all the specified parameters to complete the animation. Lookout the following example of custom animation:

  $( "#divEmployee" ).animate({
    opacity: .25,
    height: "toggle"
  }, 4500, function() {
  });

Run this jQuery code and check the animation, don’t forget to confirm the element id on your page. This code will shrinks the height of div to hide it. We will learn more about these effects and how this can stop by using jQuery function.

Program to check for leap year in C

Before writing the program let us see "What is a leap year?"
Definition: A year which satisfies one of the following two cases:

• It is divisible by 4 and should not be divisibly by 100 
• Divisible by 400

If one of the condition is true, it is a leap year. But, if both condition are false, the year is not a leap year. The following table shows whether a year is a leap year or not along with the reasons:

The partial code for this can be written as follows:

if(year % 4 == 0 && year % 100 !=0) || (year % 400 == 0)

printf ("%d is a leap year \n",year);
else
printf("%d is not a leap year \n");

The complete program is shown below:

Program
#include<stdio.h>
void main( )
{
int year;
printf("Enter the year");
scanf("%d",&year);
if((year %4==0 && year %100!=0 ) !! (year %400 == 0))
printf("%d is a leap year ",year);
else
printf("%d is not a leap year",year);
}

HTML applet tag and their attributes

Applet is a tag in html that is used to create an applet window or applet in an html document.
  Example
<!DOCTYPE html>
<html>
<head>
<title>HTML applet Tags and their attributes</title>
</head>
<body>
<applet code="classname.class" width="300" height="200">
</applet>
</body>
</html>

  Applet tag has following attributes

  Code : This attribute takes the class name of the applet code that is to be displayed . Class is the compiled code for applet
  e.g.   <applet code="abc.class" width="200" height="200" />

  Height : This attribute takes values in pixels to define the height of the applet.

  Width : This attribute takes values in pixels to define the width of the applet.

  Vspace : This attribute takes values in pixels to specify how much space is to be left above and below the object.

  Hspace : This attribute takes values in pixels to specify how much space is to be left to the right and left of the object.

  Align  : This attribute is used to align the object in the applet.

  Title : This attribute takes a string in input which is a title name or short information about the applet. This information is shown as a tooltip which pops when the move is brought over the applet.


Example
<!DOCTYPE html>
<html>
<head>
<title>Example of Line in the applet</title>
</head>
<body>
<applet code="designline.class" width="300" height="200">
</applet>
</body>
</html>

Here is the designline.java file:
import java.applet.*;
import java.awt.*;

public class designline extends Applet
{
 public void paint (Graphics gh)
   {
      gh.drawLine(10,10,200,200);
   }
}

How to retrieve images from database table in ASP.NET

Database is a storage system, through which we can store data permanently into the secondary storage device. Similar to programming languages, database also take some data types for categorize data. like int, Text, DateTime etc. Now, we will discussed on image. In this example we will retrieve images from database. First we store images into database, actually images is not stored directly, so for that path of the images is stored into the database. Now, bind the GridView with the image field.  

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Default2" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
 
    </div>
        <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="Id" DataSourceID="SqlDataSource1" Width="280px">
            <Columns>
                <asp:BoundField DataField="Id" HeaderText="Id" InsertVisible="False" ReadOnly="True" SortExpression="Id" />
                <asp:BoundField DataField="name" HeaderText="name" SortExpression="name" />
                <asp:ImageField DataImageUrlField="imagepath" HeaderText="Image">
                    <ControlStyle Height="200px" Width="200px" />
                </asp:ImageField>
            </Columns>
        </asp:GridView>
        <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:ConnectionString %>" SelectCommand="SELECT * FROM [imagetable]"></asp:SqlDataSource>
    </form>
</body>
</html>

Code Generate the following output

Program to find the larger of two numbers using ternary operator

larger = (a>b)? a:b;
The simple logic behind the program is, when a(variable) is greater than b, the value of a is assigned to larger(variable). Otherwise, the value of b is assigned to larger. The program to find the larger of two numbers using ternary operator is shown below:
#include<conio.h>
#include<stdio.h>
void main()
{
int a,b,larger;
clrscr();
printf("Enter a and b:\n");
scanf("%d%d",&a,&b);
/*The larger of a and b is stored in larger*/
larger=(a>b)?a:b;
printf("Larger=%d\n",larger);
getch();
}

Code generate the Following output

Debugging C program

Debugging is the process of isolating and correcting the errors. One simple method of debugging is to place printf( ) statements throughout the program to display the values of variables. It displays the dynamics of a C program and allows the programmer to examine and compare the data at various points. Once the location of an error is identified and corrected, the debugging statements should be removed. We can use the conditional compilation statements to switch on or off the debugging statements.

Another approach is to use the process of deduction. Here, we arrive at the errors, using the process of elimination and refinement. This is done using a list of possible causes of the error.
The third error-locating method is to backtrack the incorrect results through the logic of the program until the mistake are located. The program is traced backward until the error is located.