If you don't have knowledge of HTML, CSS & JavaScript than you may face some difficulties in validating a HTML form yet I will make the entire step very easy to understand by you.
A JavaScript function is a block of code designed to perform a particular task.
Why Functions?
You can reuse code: Define the code once, and use it many times. You can use the same code many times with different arguments, to produce different results.
What is the DOM?
The DOM is a W3C (World Wide Web Consortium) standard.
The DOM defines a standard for accessing documents:
"The W3C Document Object Model (DOM) is a platform and language-neutral interface that allows programs and scripts to dynamically access and update the content, structure, and style of a document."
The W3C DOM standard is separated into 3 different parts:
Core DOM - standard model for all document types
XML DOM - standard model for XML documents
HTML DOM - standard model for HTML documents
The HTML DOM (Document Object Model)
When a web page is loaded, the browser creates a Document Object Model of the page.
The HTML DOM model is constructed as a tree of Objects.
With the HTML DOM, JavaScript can access and change all the elements of an HTML document.
Introduction to JavaScript course. The course was updated in 2014-15.
Will allow you to understand what is JavaScript, what's it history and how you can use it.
The set of slides "Introduction to jQuery" is a follow up - which would allow the reader to have a basic understanding across JavaScript and jQuery.
A JavaScript function is a block of code designed to perform a particular task.
Why Functions?
You can reuse code: Define the code once, and use it many times. You can use the same code many times with different arguments, to produce different results.
What is the DOM?
The DOM is a W3C (World Wide Web Consortium) standard.
The DOM defines a standard for accessing documents:
"The W3C Document Object Model (DOM) is a platform and language-neutral interface that allows programs and scripts to dynamically access and update the content, structure, and style of a document."
The W3C DOM standard is separated into 3 different parts:
Core DOM - standard model for all document types
XML DOM - standard model for XML documents
HTML DOM - standard model for HTML documents
The HTML DOM (Document Object Model)
When a web page is loaded, the browser creates a Document Object Model of the page.
The HTML DOM model is constructed as a tree of Objects.
With the HTML DOM, JavaScript can access and change all the elements of an HTML document.
Introduction to JavaScript course. The course was updated in 2014-15.
Will allow you to understand what is JavaScript, what's it history and how you can use it.
The set of slides "Introduction to jQuery" is a follow up - which would allow the reader to have a basic understanding across JavaScript and jQuery.
What is JavaScript?
JavaScript is a very powerful client-side scripting language. JavaScript is used mainly for enhancing the interaction of a user with the webpage. In other words, you can make your webpage more lively and interactive, with the help of JavaScript. JavaScript is also being used widely in game development and Mobile application development.
Using this presentation you will learn dividing the browser window into different parts(frame). With frames, several Web pages can be displayed in the same browser window.
We are covering following topics:
If...Else...Elseif Statements: if statement executes some code if one condition is true.
Switch Statement: Switch Statement tests a variable against a series of values.
For Loop: For loop executes a block of code a specified number of times.
While Loop: While loop executes a block of code as long as the specified condition is true.
Do…While Loop: Do...While loop will always execute the block of code once, it will then check the condition, and repeat the loop while the specified condition is true.
PHP string function helps us to manipulate string in various ways. There are various types of string function available. Here we discuss some important functions and its use with examples.
JavaScript Arithmetic Operators
Arithmetic operators are used to perform arithmetic between variables and/or values.
JavaScript Assignment Operators
Assignment operators are used to assign values to JavaScript variables.
JavaScript String Operators
The + operator, and the += operator can also be used to concatenate (add) strings.
Comparison Operators
Comparison operators are used in logical statements to determine equality or difference between variables or values.
Conditional (Ternary) Operator
The conditional operator assigns a value to a variable based on a condition.
Logical Operators
Logical operators are used to determine the logic between variables or values.
JavaScript Bitwise Operators
Bit operators work on 32 bits numbers. Any numeric operand in the operation is converted into a 32 bit number. The result is converted back to a JavaScript number.
The delete Operator
The delete operator deletes a property from an object:
Form validation normally used to occur at the server, after the client had entered all the necessary data and then pressed the Submit button. If the data entered by a client was incorrect or was simply missing, the server would have to send all the data back to the client and request that the form be resubmitted with correct information. This was really a lengthy process which used to put a lot of burden on the server.
JavaScript provides a way to validate form's data on the client's computer before sending it to the web server. Form validation generally performs two functions.
Basic Validation − First of all, the form must be checked to make sure all the mandatory fields are filled in. It would require just a loop through each field in the form and check for data.
Data Format Validation − Secondly, the data that is entered must be checked for correct form and value. Your code must include appropriate logic to test correctness of data.
What is JavaScript?
JavaScript is a very powerful client-side scripting language. JavaScript is used mainly for enhancing the interaction of a user with the webpage. In other words, you can make your webpage more lively and interactive, with the help of JavaScript. JavaScript is also being used widely in game development and Mobile application development.
Using this presentation you will learn dividing the browser window into different parts(frame). With frames, several Web pages can be displayed in the same browser window.
We are covering following topics:
If...Else...Elseif Statements: if statement executes some code if one condition is true.
Switch Statement: Switch Statement tests a variable against a series of values.
For Loop: For loop executes a block of code a specified number of times.
While Loop: While loop executes a block of code as long as the specified condition is true.
Do…While Loop: Do...While loop will always execute the block of code once, it will then check the condition, and repeat the loop while the specified condition is true.
PHP string function helps us to manipulate string in various ways. There are various types of string function available. Here we discuss some important functions and its use with examples.
JavaScript Arithmetic Operators
Arithmetic operators are used to perform arithmetic between variables and/or values.
JavaScript Assignment Operators
Assignment operators are used to assign values to JavaScript variables.
JavaScript String Operators
The + operator, and the += operator can also be used to concatenate (add) strings.
Comparison Operators
Comparison operators are used in logical statements to determine equality or difference between variables or values.
Conditional (Ternary) Operator
The conditional operator assigns a value to a variable based on a condition.
Logical Operators
Logical operators are used to determine the logic between variables or values.
JavaScript Bitwise Operators
Bit operators work on 32 bits numbers. Any numeric operand in the operation is converted into a 32 bit number. The result is converted back to a JavaScript number.
The delete Operator
The delete operator deletes a property from an object:
Form validation normally used to occur at the server, after the client had entered all the necessary data and then pressed the Submit button. If the data entered by a client was incorrect or was simply missing, the server would have to send all the data back to the client and request that the form be resubmitted with correct information. This was really a lengthy process which used to put a lot of burden on the server.
JavaScript provides a way to validate form's data on the client's computer before sending it to the web server. Form validation generally performs two functions.
Basic Validation − First of all, the form must be checked to make sure all the mandatory fields are filled in. It would require just a loop through each field in the form and check for data.
Data Format Validation − Secondly, the data that is entered must be checked for correct form and value. Your code must include appropriate logic to test correctness of data.
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# Internet Security: Safeguarding Your Digital World
In the contemporary digital age, the internet is a cornerstone of our daily lives. It connects us to vast amounts of information, provides platforms for communication, enables commerce, and offers endless entertainment. However, with these conveniences come significant security challenges. Internet security is essential to protect our digital identities, sensitive data, and overall online experience. This comprehensive guide explores the multifaceted world of internet security, providing insights into its importance, common threats, and effective strategies to safeguard your digital world.
## Understanding Internet Security
Internet security encompasses the measures and protocols used to protect information, devices, and networks from unauthorized access, attacks, and damage. It involves a wide range of practices designed to safeguard data confidentiality, integrity, and availability. Effective internet security is crucial for individuals, businesses, and governments alike, as cyber threats continue to evolve in complexity and scale.
### Key Components of Internet Security
1. **Confidentiality**: Ensuring that information is accessible only to those authorized to access it.
2. **Integrity**: Protecting information from being altered or tampered with by unauthorized parties.
3. **Availability**: Ensuring that authorized users have reliable access to information and resources when needed.
## Common Internet Security Threats
Cyber threats are numerous and constantly evolving. Understanding these threats is the first step in protecting against them. Some of the most common internet security threats include:
### Malware
Malware, or malicious software, is designed to harm, exploit, or otherwise compromise a device, network, or service. Common types of malware include:
- **Viruses**: Programs that attach themselves to legitimate software and replicate, spreading to other programs and files.
- **Worms**: Standalone malware that replicates itself to spread to other computers.
- **Trojan Horses**: Malicious software disguised as legitimate software.
- **Ransomware**: Malware that encrypts a user's files and demands a ransom for the decryption key.
- **Spyware**: Software that secretly monitors and collects user information.
### Phishing
Phishing is a social engineering attack that aims to steal sensitive information such as usernames, passwords, and credit card details. Attackers often masquerade as trusted entities in email or other communication channels, tricking victims into providing their information.
### Man-in-the-Middle (MitM) Attacks
MitM attacks occur when an attacker intercepts and potentially alters communication between two parties without their knowledge. This can lead to the unauthorized acquisition of sensitive information.
### Denial-of-Service (DoS) and Distributed Denial-of-Service (DDoS) Attacks
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Wireless communication can be used for cellular telephony, wireless access to the internet, wireless home networking, and so on.
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Form Validation in JavaScript
1. Form Validation in JavaScript
ADMEC MULTIMEDIA
Leader in Animation & Digital Media Education
ISO 9001:2008 CERTIFIED | ADOBE Testing Center
www.admecindia.co.in
2. Hi, I am Abhishek Ranjan a web designer working in a
company in Delhi and studying UI development and
Responsive Website designing in ADMEC Multimedia
Institute institute to excel my knowledge of JavaScript,
jQuery, and Bootstrap to the advanced level.
What is Form Validation?
Form validation is the process of checking that a form has
been filled in correctly before it is processed, this is
called form validation.
What you need to know before from validation?
•HTML
•CSS
•JavaScript
Note:- If you don't have knowledge of HTML, CSS & JavaScript than you may face some
difficulties in validating a HTML form yet I will make the entire step very easy to understand by
you.
3. Ok let’s start form Validation
There are main two methods of validating form:
1. Server side method 2. Client side method
1. Server-side: - This validation is more secure
but often more tricky to code because it takes
down theclient side validation. It is important
when a hacker disables the performance of
the website. It is compulsory to add in a web
form but along with the JavaScript then server
side validation protects your website.
2. Client-side : Client side(JavaScript) validation
is easier to do and quicker too (the browser
doesn't have to connect to the server to
validate the form, so the user finds out instant
ly if they've missed out that required field!).
4. JavaScript provides a way to validate form's data on the client's computer before
sending it to the web server. Form validation generally performs two functions.
Basic Validation - First of all, the form must be checked to make sure data was
entered into each form field that required it. This would need just loop through each
field in the form and check for data.
Data Format Validation - Secondly, the data that is entered must be checked for
correct form and value. This would need to put more logic to test correctness of data.
A Simple Form with Validation :
Let's build a simple form with a validation script. The form will include more than one
input box, select-box, checkbox, radio-button,
drop-down-box, message-box, reset-button and a submit button. Our validation
script will ensure that the users enter their proper
information before the form is sent to the server.
5. Example:
HTML form:
//Below I am using these methods, action, onsubmit="return validation(this) in HTML first line
which is necessary for Form:
Ok now,
First tell you what is a method?
Methods are the action that can be performed on objects through which a browser sends form
information to Server.
There are two types of methods:-
1. Post 2. Get
Post method : Post method is used for sending information to server. All programmers use
mainly post method because it is secure and can transfer unlimited information.
Get method : Get method is used for sending information to server too. Get method is less-
secure than Post method.
Action: Action is an form attribute where we assign a PHP file generally and this file capture
the data submitted from this form and then validate it for the further uses.
onsubmit : onsubmit is an event of JavaScript, it monitors for the submit action as someone
clicks on
7. JavaScript:
Now I am going to create a function with the name of validation and it has a parameter in it.
This parameter will be replace with ‘this’ keyword in form’s ‘onsubmit’ attribute so it will
point to the form. I will be collecting all the values first and then add conditions to check one
by one using ‘if’ conditional so that I can show all the errors at a time. You will notice a
regular expression pattern too in this form validation in JavaScript code.
<script type="text/javascript">
//lets create a function
function validation(arg){
// arg is used to pass value
vargName = arg.name.value;
//Get the value of name(selecter) and put in gName(variable)
vargPhone = arg.phone.value;
//Get the value of phone(selecter) and put in gPhone(Variable)
vargEmail = arg.email.value;
//Get the value of email(selecter) and put in gEmail(Variable)
vargComm = arg.comm.value;
//Get the Value of comm(selecter) and put in gComm (Variable)
varePat = /^[a-z-._0-9]+@[a-z0-9]+.[a-z.]{2,5}$/;
/* ^[a-z-._0-9] ->Reg Ex is use to allow use only a-z , . , _ and 0-9 digits.
+@ -> "+" is for concatinet @
8. [a-z0-9] ->Reg ex is use to allow to use only a-z and 0-9 digits */
varnamePatDt = /./;
//Find a single character, except newline or line terminator
varnamePatDgt = /d/;
//Only digits find
var err = "";
// err variable is used to show error message.
varerrNum = 0;
// errNum variable is used to show error index
if (gName == "" || gName.length< 3 || namePatDt.test(gName) ||
namePatDgt.test(gName)) {
errNum++;
err += errNum + ". Invalid name.n";
}
/* This code check the value : If Value empety or value length less than 3 or value is digit than
Show error Indvalid Name */
if (gPhone == "" || gPhone.length< 8 || isNaN(gPhone)) {
errNum++;
err += errNum + ". Invalid phone num.n";
}
9. /* This code check the value : If value is empty or value length less than 8 or is not a
null then show error Invalid Phone num */
if (gEmail == "") {
errNum++;
err += errNum + ". Enter Email.n";
}
/* If you don't Enter anything in Email field than show error(Enter Email) */
else{
if(!ePat.test(gEmail)){
errNum++;
err += errNum + ". Invalid Email.n";
}
}
/* If you don't Enter Email address in ePat format (i already discribe "ePat") than shaw
error (Invalid Email) */
if (gComm == "") {
errNum++;
err += errNum + ". Enter comments.n";
}
10. /* If you don't Enter anything in Comment field than show error(Enter Comments) */
if (!arg.gender[0].checked && !arg.gender[1].checked) {
errNum++;
err += errNum + ". Select gender.n";
}
/* If you don't checked 0 index of gender field or 1 index than show error(Select gender)*/
if (!arg.tv.checked&& !arg.radio.checked) {
errNum++;
err += errNum + ". Select Reference.n";
}
/* If you don't checked tv field and radio field than show error(Select Reference) */
if (arg.course.selectedIndex< 1) {
errNum++;
err += errNum + ". Select Course.n";
}
/* This code check your selection index if your index is less than 1 than show error (Select
course) */
if (errNum>0) {
alert(err);
return false;
}
11. /* IferrNum is greater than 0 than alert error and return "false" */
else{
alert('done');
return true;
}
/* If errNum is less than 0 or 0 than alert "done"
and return "true"*/
}
main();
</script>
Summary :
Above explanation will surely help you in understanding Form Validation in JavaScript and
HTML. The Form Validation is being used almost in every website. It is very good to create a
safe and performance rich website because everything can't be left out for the server as sever
sucks. If you want help or advanced Form Validation training then you can join our online
JavaScript classes or classroom.
12. Contact Us:
ADMEC MULTIMEDIA INSTITUTE
C-7/114, IInd Floor, Sector- 7, Rohini, Delhi- 85
Landmark: Near Rohini East Metro Station
Helpline 1: +91 9811 818 122
Helpline 2: +91 9911 782 350
ADMEC MULTIMEDIA
Leader in Animation & Digital Media Education
ISO 9001:2008 CERTIFIED | ADOBE Testing Center
ADMEC MULTIMEDIA INSTITUTE
For More information you can visit :
http://www.admecindia.co.in
OR
http://www.admecindia.co.in/blog/easy-tutorial-html-form-validation-using-javascript