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Introduction to jQuery fadeOut()

The fadeOut() method of jQuery is used to gradually hide an element in the DOM by fading it to transparency. This is a very straightforward method. If the element is visible and the fadeOut() method is called on that element, the element slowly turns transparent until it becomes invisible.

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Syntax for jQuery fadeOut()

NOTE: jQuery methods are case sensitive. Be careful to capitalize the letter ‘O’ in the fadeOut() method.

Syntax #1

The basic and the most elementary syntax is as follows:

This method will fade the element in 400 milliseconds. The value 400 is the default value of the duration parameter.

Syntax #2

Here duration is the time in milliseconds for the fading animation effect. If this argument is not supplied, the default value of 400 milliseconds is applied. The complete is a callback function that is called once the fading-out animation is complete. A very important point to note here is that the callback function is called once for each element.

Syntax #3

The jQuery v1.4.3 introduced another variation of the fadeOut method. It expected another string-typed parameter that would define the type of transition during the animation. The possible values are ‘swing’ or ‘linear’, the former being the default.

So, how does the fadeOut method achieve its goal? Simple answer, it plays with the CSS opacity and displays properties of the element. Over the duration of the fading out activity, the opacity of the element is gradually decreased. Once it reaches zero, the display property is set to none. The higher the duration, the slower is the fading animation.

Examples of jQuery fadeOut()

Let us look at some of the examples of the fadeOut() method.

NOTE: Throughout the examples in this article, we would be using the browsers’ developer console. Simply open the browser developer tools (Ctrl/Cmd + Shift + C) and go to the Console tab in the developer tools window.

The window will look like the below screen in Chrome:

Next, we identify the element we would like to fade. Let’s fade out the jQuery logo. From the Elements tab in the developer window, you would see that the element is this:

This element is uniquely defined through a class logo. We would use this class as a selector.

NOTE: When using a class as a selector, all the elements to which the class is applied are selected. To select a single element, use the id attribute.

Next, go to the console tab and type the following command:

$('.logo').fadeOut();

As you press enter, notice that the jQuery logo slowly disappears from the page.

Next, go back to the Elements tab and search for the logo element again. Notice the addition of CSS display property to the element now. It has now changed to this:

But wait, we couldn’t see the opacity property in action. Let’s do that. Go back to the console tab and type the following command:

$('.logo').fadeOut(10000);

We are giving a duration of 10 seconds for the fading animation. As you press enter, be quick to go back to the Elements tab. You would notice that the jQuery logo disappears on the page with the CSS opacity property in action.

Implementation of jQuery fadeOut()

Step 1 –  Open Notepad and Paste the Following Code in it.

$(document).ready(function () { $(“#para”).fadeOut(); }); $(“#para”).fadeOut(5000); }); $(“#pic1”).fadeOut(8000, “linear”, function () { window.alert(“Yayy!!! Pic 1 faded out”); }); $(“#pic2”).fadeOut(8000, “swing”, function () { window.alert(“Yayy!!! Pic 2 faded out”); }); }); $(“.ele”).fadeIn(0); }); });

Step 2 – Save the File as an HTML File

Save the file with the extension .html. This will save the file as an HTML file.

Step 3 – Open the Browser and Open the File You Just Saved

The rendered HTML page would look like this:

Conclusion

So, we have covered the fadeOut() function of jQuery in this article. We have understood how the fadeOut function works behind the scenes. In addition, we implemented our own working fadeOut model. Also, once the concept is familiarised, you would play around more with various other optional parameters supported by the fadeOut method.

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C++ Program To Implement Multiset In Stl

A multiset is a type of associative container in which has multiple elements can have same values.

Functions and descriptions: Functions are used here:    ms.size() = Returns the size of multiset.    ms.insert) = It is used to insert elements to the multiset.    ms.erase() = Removes the value from the multiset.    ms.find() = Returns an iterator to the search element in the multiset if found,    else returns the iterator to end.    ms.count() = Returns the number of matches element in the multiset.    ms.begin() = Returns an iterator to the first element in the multiset. using namespace std; int main() {    int c, i;    while (1) {       cout<<"1.Size of the Multiset"<<endl;       cout<<"2.Insert Element into the Multiset"<<endl;       cout<<"3.Delete Element from the Multiset"<<endl;       cout<<"4.Find Element in a Multiset"<<endl;       cout<<"5.Count Elements with a specific key"<<endl;       cout<<"6.Display Multiset"<<endl;       cout<<"7.Exit"<<endl;       cout<<"Enter your Choice: ";       switch(c) {          case 1:             cout<<"Size of the Multiset: "<<ms.size()<<endl;          break;          case 2:             cout<<"Enter value to be inserted: ";             if (ms.empty())                it1 = ms.insert(i);             else                it1 = ms.insert(it1, i);          break;          case 3:             cout<<"Enter value to be deleted: ";             ms.erase(i);          break;          case 4:             cout<<"Enter element to find ";             it = ms.find(i);             if (it != ms.end())                cout<<"Element found"<<endl;             else                cout<<"Element not found"<<endl;          break;          case 5:             cout<<"Enter element to be counted: ";             cout<<i<<" appears "<<ms.count(i)<<" times."<<endl;          break;          case 6:             cout<<"Elements of the Multiset: ";             for (it = ms.begin(); it != ms.end(); it++)                cout<<*it<<" ";             cout<<endl;          break;          case 7:             exit(1);          break;          default:             cout<<"Wrong Choice"<<endl;       }    }    return 0; } Output 1.Size of the Multiset 2.Insert Element into the Multiset 3.Delete Element from the Multiset 4.Find Element in a Multiset 5.Count Elements with a specific key 6.Display Multiset 7.Exit Enter your Choice: 1 Size of the Multiset: 0 1.Size of the Multiset 2.Insert Element into the Multiset 3.Delete Element from the Multiset 4.Find Element in a Multiset 5.Count Elements with a specific key 6.Display Multiset 7.Exit Enter your Choice: 2 Enter value to be inserted: 1 1.Size of the Multiset 2.Insert Element into the Multiset 3.Delete Element from the Multiset 4.Find Element in a Multiset 5.Count Elements with a specific key 6.Display Multiset 7.Exit Enter your Choice: 2 Enter value to be inserted: 2 1.Size of the Multiset 2.Insert Element into the Multiset 3.Delete Element from the Multiset 4.Find Element in a Multiset 5.Count Elements with a specific key 6.Display Multiset 7.Exit Enter your Choice: 2 Enter value to be inserted: 3 1.Size of the Multiset 2.Insert Element into the Multiset 3.Delete Element from the Multiset 4.Find Element in a Multiset 5.Count Elements with a specific key 6.Display Multiset 7.Exit Enter your Choice: 2 Enter value to be inserted: 4 1.Size of the Multiset 2.Insert Element into the Multiset 3.Delete Element from the Multiset 4.Find Element in a Multiset 5.Count Elements with a specific key 6.Display Multiset 7.Exit Enter your Choice: 6 Elements of the Multiset: 1 2 3 4 1.Size of the Multiset 2.Insert Element into the Multiset 3.Delete Element from the Multiset 4.Find Element in a Multiset 5.Count Elements with a specific key 6.Display Multiset 7.Exit Enter your Choice: 3 Enter value to be deleted: 4 1.Size of the Multiset 2.Insert Element into the Multiset 3.Delete Element from the Multiset 4.Find Element in a Multiset 5.Count Elements with a specific key 6.Display Multiset 7.Exit Enter your Choice: 4 Enter element to find 1 Element found 1.Size of the Multiset 2.Insert Element into the Multiset 3.Delete Element from the Multiset 4.Find Element in a Multiset 5.Count Elements with a specific key 6.Display Multiset 7.Exit Enter your Choice: 5 Enter element to be counted: 2 2 appears 1 times. 1.Size of the Multiset 2.Insert Element into the Multiset 3.Delete Element from the Multiset 4.Find Element in a Multiset 5.Count Elements with a specific key 6.Display Multiset 7.Exit Enter your Choice: 7 Exit code: 1

C++ Program To Implement Stack Using Array

using namespace std; int stack[100], n=100, top=-1; void push(int val) {    cout<<“Stack Overflow”<<endl;    else {       top++;       stack[top]=val;    } } void pop() {    if(top<=-1)    cout<<“Stack Underflow”<<endl;    else {       cout<<“The popped element is “<< stack[top] <<endl;       top–;    } } void display() {       cout<<“Stack elements are:”;       cout<<stack[i]<<” “;       cout<<endl;    } else    cout<<“Stack is empty”; } int main() {    int ch, val;    cout<<“1) Push in stack”<<endl;    cout<<“2) Pop from stack”<<endl;    cout<<“3) Display stack”<<endl;    cout<<“4) Exit”<<endl;    do {       cout<<“Enter choice: “<<endl;       switch(ch) {          case 1: {             cout<<“Enter value to be pushed:”<<endl;             push(val);             break;          }          case 2: {             pop();             break;          }          case 3: {             display();             break;          }          case 4: {             cout<<“Exit”<<endl;             break;          }          default: {             cout<<“Invalid Choice”<<endl;          }       }    }while(ch!=4);    return 0; }

Output 1) Push in stack 2) Pop from stack 3) Display stack 4) Exit Enter choice: 1 Enter value to be pushed: 2 Enter choice: 1 Enter value to be pushed: 6 Enter choice: 1 Enter value to be pushed: 8 Enter choice: 1 Enter value to be pushed: 7 Enter choice: 2 The popped element is 7 Enter choice: 3 Stack elements are:8 6 2 Enter choice: 5 Invalid Choice Enter choice: 4 Exit

In the above program, the push() function takes argument val i.e. value to be pushed into the stack. If a top is greater than or equal to n, there is no space in a stack and overflow is printed. Otherwise, val is pushed into the stack. The code snippet for this is as follows.

void push(int val) {    cout<<"Stack Overflow"<<endl;    else {       top++;       stack[top]=val;    } }

The pop() function pops the topmost value of the stack, if there is any value. If the stack is empty then underflow is printed. This is given as follows.

void pop() {    if(top<=-1)    cout<<"Stack Underflow"<<endl;    else {       cout<<"The popped element is "<< stack[top] <<endl;       top--;    } }

The display() function displays all the elements in the stack. It uses a for loop to do so. If there are no elements in the stack, then Stack is empty is printed. This is given below.

void display() {       cout<<"Stack elements are:";       cout<<stack[i]<<" ";       cout<<endl;    }else    cout<<"Stack is empty"; }

The function main() provides a choice to the user if they want to push, pop or display the stack. According to the user response, the appropriate function is called using switch. If the user enters an invalid response, then that is printed. The code snippet for this is given below.

int main() {    int ch, val;    cout<<"1) Push in stack"<<endl;    cout<<"2) Pop from stack"<<endl;    cout<<"3) Display stack"<<endl;    cout<<"4) Exit"<<endl;    do {       cout<<"Enter choice: "<<endl;       switch(ch) {          case 1: {             cout<<"Enter value to be pushed:"<<endl;             push(val);             break;          }          case 2: {             pop();             break;          }          case 3: {             display();             break;          }          case 4: {             cout<<"Exit"<<endl;             break;          }          default: {             cout<<"Invalid Choice"<<endl;          }       }    }while(ch!=4);    return 0; }

Overview And Various Examples Of Jquery Keydown()

Overview of jQuery keydown()

The jQuery keydown() method is used to handle the key down event which is generated by pressing the keyboard button. This is a built-in method in jQuery. This method is used to handle the keydown event which is generated by pressing the key on the keyboard and the keydown() method handle the event by executing associated function.

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Keypress() event: This event is generated when the key is pressed down.

Keyup() event: This event is generated when the key is released.

The order of an execution of the jQuery event methods is:

keydown() event

Keypress() event

Keyup() event

The syntax of the keydown() method:

$(selector).keydown(): This method triggers the keydown event for selected html elements.

$(selector).keydown( function ): This method triggers a function to the keydown event for selected html element.

Parameter:

Function: This is an optional parameter. It specifies the name of the method which is to be executed when the keydown event is generated.

Examples of jQuery keydown()

Example of jQuery keydown ( ) method with parameters are as follows –

Example #1

Next, we write the html code to understand this method more clearly with the following example where we apply the keydown() method to the first input text box element

Code:

$(document).ready( function(){ $( “input” ).keydown( function(){ $( “input” ).css( “background-color”, ” red “); }); });

Output:

Once we press the key in the text box, the output is –

Example #2

Next, we rewrite the html code to understand the jQuery keydown() and jQuery keyup() method more clearly with the following example where we apply the keydown() method and jQuery keyup() method to the first input text box element –

Code:

$(document).ready( function(){ $( “input”).keydown( function(){ $( “input”).css( “background-color”, ” red “); }); $( “input”).keyup( function(){ $( “input”).css( “background-color”, ” yellow “); }); });

Output:

Once we press the key in the text box, the output is –

As in the above output, the keydown() method triggers the event and handle the keydown event of the selected elements in the jQuery collection, If we write something in the text box then the text box colour changes red on keydown and yellow on keyup events, as showing in the above output.

Example #3

Code:

$(document).ready(function(){ $( “input” ).keydown( function(){ $( “input”).css( “background-color”, ” red “); }); $(“input”).keyup(function(){ $( “input”).css( “background-color”, ” yellow “); }); $(“input”).keypress(function(){ $( “input”).css( “background-color”, ” black “); }); });

Output:

Once we press the key in the text box the background colour change to black and key release the background colour change to yellow, the output is –

When we press the backspace key in the text box then only the jQuery keydown() method is executing, otherwise, on keypress, the jQuery keypress() method is executing and the output is –

Conclusion

The jQuery keydown() method used to handle the key down event.

The keydown event is generated by pressing any keyboard button.

It is a built-in method in jQuery.

The method is used to handles the keydown by executing an associated function.

The keydown() event is usually used with other two events, which are Keypress() event ( generated when the key is pressed down) and Keyup() event ( generated when the key is released).

The syntax of the keydown() method is $(selector).keydown() and $(selector).keydown( function ), the parameter function is an optional parameter. It specifies the name of the function which is to be executed when the keydown event is generated.

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How To Call A Method In Java

How to call a method in Java – the basics

To call a method in Java, you type the method’s name, followed by brackets.

For example, the following will call a method called “helloMethod()”:

Code

helloMethod();

In order for this to work though, we first need to create our helloMethod() method. We can see what helloMethod might look like, here:

Code

public static void helloMethod() {     System.out.println("Hello world!"); How to create methods in Java

Let’s rewind a moment and take a closer look at the method we created. Why does it look the way it does?

To build a method, we use a number of statements to define that method. In the previous example:

Public – Means that the method is accessible to other classes outside of this one

Static – Means that the method belongs to the class and not the instance of the class

Void – Means that the method does not return a value

If none of that makes any sense to you, don’t worry! Most new developers will be able to use “public static void” for the majority of their methods and won’t have to worry. That said, we’ll address two of these phrases in the coming sections.

It is considered good practice to name Java methods using “camel case.” As we aren’t allowed spaces, camel case gets around this by capitalizing every word except the first one. Methods should generally be verbs (though I have bent that rule here!).

How to use arguments when calling a method in Java

As mentioned, we can place arguments inside of the brackets when defining our methods. This allows us to pass variables, and therefore values, between methods.

For example, a “String” is a type of variable that holds alphanumeric characters. We create a string by using the word “String” followed by the name.

Now, whenever we call that method, we need to add the value we want to use in the brackets.

Code

helloClass.helloMethod("Hello there!"); public static void helloMethod(String helloMessage) {     System.out.println(helloMessage);   } How to call a method from outside the class

A public method is a method that can be called from outside your class. To do this, you use the following syntax:

nameOfClass.nameOfMethod(arguments)

For example:

Code

class Main {   public static void main(String[] args) {     helloClass.helloMethod();   } } class helloClass {   public static void helloMethod() {     System.out.println("Hello world!");   } }

However, if we wanted to prevent this from working, we would simply replace the word “public” with the word “private”.

How to return values

Finally, we can return specific values from our methods. Let’s see how this might be used.

Let’s say we decide we want the method to provide our greeting but not display it onto the screen. Thus, we might make the method return a string. To do this, we change the word “void” for the type of variable we want to return, and we add “return value” at the end of the method.

This changes how we call a method in Java, because we can simply insert the name of the method in-line in our code, as though it were a variable:

Code

class Main {   public static void main(String[] args) {     System.out.println(helloMethod());   }   public static String helloMethod() {       return "Hello there!";   } 

Top 7 Examples To Implement Of Linux Gzip

Introduction to Linux gzip

Linux gzip is a compression algorithm to reduce the file size and keep the original file size, timestamp and ownership. The Linux gzip is also called a gunzip. The gzip is a software application or utility to compress or decompress the file with existing file property. In the Linux operating system, we have different compression and decompression technics but the gzip having much faster compression speed is 43.95 in MB per second and decompression speed is 88.25 in MB per second.

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Syntax:

As per the above gzipsyntax, we need to provide the different options in gzip command and provide the file or directory to whom we need to compress.

How Linux gzip Command Works?

Basically gzip algorithm is based on “DEFLATE” algorithm. It is a combination of LZ77 and Huffman coding. While compression of any data or file, we need to consider different things like a 10-byte header, magic number (1f 8b), the DEFLATE compression method, 1-byte of header flags, 4-byte timestamp, compression flags and the operating system ID. If needed the extra headers are allowing by the header flags. In the body, the compressed payload containing a DEFLATE. In the footer, it is containing a CRC-32 checksum, 8-byte footer value and the length of the original uncompressed data. With the help of header, body and footer it will help to compress the data or file.

Essentially gzip is normally used to compress the single files. But if you want to compress the archival data or collection of data then we can compress in a single tar archival. It is also known as the tarball. 

Examples to Implement of Linux gzip

Below are the examples of Linux gzip:

1. Compress File

Command:

gzip example.txt

Explanation: In the sample directory, we are having the chúng tôi file (refer screenshot 1 (a)). We are compressing the file by the default method of gzip. The gzip keeps the original file information of timestamp, ownership and name of the file.

Output:

Screenshot 1 (a)

Screenshot 1 (b)

2. Keep Original Fine

If you want to keep the original file while compressing then we can use the “-c” keyword with gzip command.

Command:

Explanation: In the sample directory, we are having the chúng tôi file (refer screenshot 2 (a)). We are compressing the file but keeping the original file as it is. As per the above command, we are using the “-c” keyword which tells gzip command to write on the standard output and redirect to the output file (refer screenshot 2 (b)).

Output:

Screenshot 2 (a)

Screenshot 2 (b)

3. Verbose Output

If you want to output the output with name and percentage process for each file of compression or decompression then we will use the “-v” option with gzip command.

Command:

gzip -v file1.txt

Explanation: In the sample directory, we are having the chúng tôi file. Now we are compressing the chúng tôi file using verbose option “-v”.

Output:

4. Compress Multiple Files

In gzip, we are having the functionality to compress the multiple files.

Command:

gzip f1 f2 f3 f4 f5

Explanation: In the sample directory, we are having the multiple files (f1, f2, f3, f4 and f5) (refer screenshot 4 (a)). We are compressing all the files(refer to screenshot 4 (b)).

Screenshot 4 (a)

Screenshot 4 (b)

5. Compress Directory Files

The gzip will recursively compress the whole directory structure and compress all the files in the directory and it is subdirectories as well.

To compress the directory, we need to use the “-r” option in gzip command.

Command:

gzip -r log

Explanation:

In the sample directory, we are having a log directory. In the log directory, we are having the multiple files and subdirectories in it (refer screenshot 5 (a)). Using the “-r” option in gzip command, we can compress all the files and subdirectories in it (refer screenshot 5 (b)).

Output:

Screenshot 5 (a)

Screenshot 5 (b)

6. Compression Level

In gzip, there are different compression rations. As per our requirement, we can change in compression ratio and speedup the compression speed. By default, the compression ratio is -6. In gzip, the compression ratio and speed of compression are inversely proportional to each other i.e. if the compression ratio is high then the compression speed is less or the compression ratio is less than the compression speed is high. Using “-1” is the high compression speed but low compression ratio. The option “-9” having the high compression ration but the compression speed is less.

gzip -9 sample.txt

Explanation: As per the compression speed and compression ratio, we can use the different options in the gzip command. In the above example, we have used “-9” option. It is having a high compression ratio but less compression speed.

Output:

Screenshot 6 (a)

Screenshot 6 (b)

7. Decompressing Files

In gzip, we can compress the multiple files as well as directories. In such a way, we can decompress the “.gz” file. We are having the functionality to decompress the data compress data via gzip.

To decompress the data, we can use the “-d” option.

Command :

gzip -d sample.txt.gz

Explanation: In the sample directory, we are having the compressed file “sample.txt.gz” (refer screenshot 6 (a)). With the help of the “-d” option, we can decompress the “sample.txt.gz” file into original file format “.txt”. After decompression of the file, we can able to do the normal file operation.

Output:

Screenshot 7 (a)

Screenshot 7 (b)

Conclusion

We have seen the uncut concept of “Linux gzip” with the proper example, explanation and command with different outputs. The gzip software is for compression and decompression of file and directories. It will helpful for proper clean-up of the operating system and keep unused data or files in compress format. If in future we can decompress it and use the same compress files.

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We hope that this EDUCBA information on “Linux gzip” was beneficial to you. You can view EDUCBA’s recommended articles for more information.

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