How to Validate an IP address using Javascript

How to Validate an IP address using Javascript

IP address validation using javascript

IP address validation

Every computer connected to the Internet is identified by a unique four-part string, known as its Internet Protocol (IP) address. An IP address consists of four numbers (each between 0 and 255) separated by periods. The format of an IP address is a 32-bit numeric address written as four decimal numbers (called octets) separated by periods; each number can be written as 0 to 255 (e.g., 0.0.0.0 to 255.255.255.255).

Example of valid IP address

  • 115.42.150.37
  • 192.168.0.1
  • 110.234.52.124

Example of invalid IP address

  • 210.110 – must have 4 octets
  • 255 – must have 4 octets
  • y.y.y.y – the only digit has allowed
  • 255.0.0.y – the only digit has allowed
  • 666.10.10.20 – digit must between [0-255]
  • 4444.11.11.11 – digit must between [0-255]
  • 33.3333.33.3 – digit must between [0-255]

JavaScript code to validate an IP address

function ValidateIPaddress(ipaddress) 
{
 if (/^(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$/.test(myForm.emailAddr.value))
  {
    return (true)
  }
alert("You have entered an invalid IP address!")
return (false)
}

Explanation of the said Regular expression (IP address)

Regular Expression Pattern :

/^(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?).(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?).(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?).(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$/

Note: Last two parts of the regular expression is similar to above.

Syntax diagram - IP-address validation:

Let apply the above JavaScript function in an HTML form.

HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>JavaScript form validation - checking IP address/title>
<link rel='stylesheet' href='form-style.css' type='text/css' />
</head>
<body onload='document.form1.text1.focus()'>
<div class="mail">
<h2>Input an IP address and Submit</h2>
<form name="form1" action="#"> 
<ul>
<li><input type='text' name='text1'/></li>
<li>&nbsp;</li>
<li class="submit"><input type="submit" name="submit" value="Submit" onclick="ValidateIPaddress(document.form1.text1)"/></li>
<li>&nbsp;</li>
</ul>
</form>
</div>
<script src="ipaddress-validation.js"></script>
</body>
</html>

JavaScript Code

function ValidateIPaddress(inputText)
 {
 var ipformat = /^(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$/;
 if(inputText.value.match(ipformat))
 {
 document.form1.text1.focus();
 return true;
 }
 else
 {
 alert("You have entered an invalid IP address!");
 document.form1.text1.focus();return false;
 }
 }

Flowchart:

CSS Code

li {list-style-type: none;
font-size: 16pt;
}
.mail {
margin: auto;
padding-top: 10px;
padding-bottom: 10px;
width: 400px;
background : #D8F1F8;
border: 1px soild silver;
}
.mail h2 {
margin-left: 38px;
}
input {
font-size: 20pt;
}
input:focus, textarea:focus{
background-color: lightyellow;
}
input submit {
font-size: 12pt;
}
.rq {
color: #FF0000;
font-size: 10pt;
}

Thank for reading !

HTML 5 Tutorial: How to create a table using HTML tags and Stylesheet (CSS)

HTML 5 Tutorial: How to create a table using HTML tags and Stylesheet (CSS)

In this article, we want to show you how to create a table using HTML tags and Stylesheet (CSS). HTML table may vary depends on data and style requirements. Sometimes, in the real application, we use an HTML table as a layout of the Email template in HTML format.

In this article, we want to show you how to create a table using HTML tags and Stylesheet (CSS). HTML table may vary depends on data and style requirements. Sometimes, in the real application, we use an HTML table as a layout of the Email template in HTML format.

HTML Table uses to represent tabular data like in the Excel Application and arrange the layout of the Web View.

There are some common HTML tags that use by HTML table:

Before start practicing HTML 5 table, make sure all

tag put inside complete and tag.

<!DOCTYPE html>
<html>
 <head>
  <title>Basic HTML Table</title>
 </head>
 <body>
  <table></table>
 </body>
</html>

Basic HTML Table

Here is an example of a basic HTML table or common use of the above HTML tags to define or create a table.

<table>
 <tr>
  <th>No.</th>
  <th>Full Name</th>
  <th>Position</th>
  <th>Salary</th>
 </tr>
 <tr>
  <td>1</td>
  <td>Bill Gates</td>
  <td>Founder Microsoft</td>
  <td><table>
 <tr>
  <th>No.</th>
  <th>Full Name</th>
  <th>Position</th>
  <th>Salary</th>
 </tr>
 <tr>
  <td>1</td>
  <td>Bill Gates</td>
  <td>Founder Microsoft</td>
  <td>$1000</td>
 </tr>
 <tr>
  <td>2</td>
  <td>Steve Jobs</td>
  <td>Founder Apple</td>
  <td>$1200</td>
 </tr>
 <tr>
  <td>3</td>
  <td>Larry Page</td>
  <td>Founder Google</td>
  <td>$1100</td>
 </tr>
 <tr>
  <td>4</td>
  <td>Mark Zuckeberg</td>
  <td>Founder Facebook</td>
  <td>$1300</td>
 </tr>
</table>
000</td>
 </tr>
 <tr>
  <td>2</td>
  <td>Steve Jobs</td>
  <td>Founder Apple</td>
  <td><table>
 <tr>
  <th>No.</th>
  <th>Full Name</th>
  <th>Position</th>
  <th>Salary</th>
 </tr>
 <tr>
  <td>1</td>
  <td>Bill Gates</td>
  <td>Founder Microsoft</td>
  <td>$1000</td>
 </tr>
 <tr>
  <td>2</td>
  <td>Steve Jobs</td>
  <td>Founder Apple</td>
  <td>$1200</td>
 </tr>
 <tr>
  <td>3</td>
  <td>Larry Page</td>
  <td>Founder Google</td>
  <td>$1100</td>
 </tr>
 <tr>
  <td>4</td>
  <td>Mark Zuckeberg</td>
  <td>Founder Facebook</td>
  <td>$1300</td>
 </tr>
</table>
200</td>
 </tr>
 <tr>
  <td>3</td>
  <td>Larry Page</td>
  <td>Founder Google</td>
  <td><table>
 <tr>
  <th>No.</th>
  <th>Full Name</th>
  <th>Position</th>
  <th>Salary</th>
 </tr>
 <tr>
  <td>1</td>
  <td>Bill Gates</td>
  <td>Founder Microsoft</td>
  <td>$1000</td>
 </tr>
 <tr>
  <td>2</td>
  <td>Steve Jobs</td>
  <td>Founder Apple</td>
  <td>$1200</td>
 </tr>
 <tr>
  <td>3</td>
  <td>Larry Page</td>
  <td>Founder Google</td>
  <td>$1100</td>
 </tr>
 <tr>
  <td>4</td>
  <td>Mark Zuckeberg</td>
  <td>Founder Facebook</td>
  <td>$1300</td>
 </tr>
</table>
100</td>
 </tr>
 <tr>
  <td>4</td>
  <td>Mark Zuckeberg</td>
  <td>Founder Facebook</td>
  <td><table>
 <tr>
  <th>No.</th>
  <th>Full Name</th>
  <th>Position</th>
  <th>Salary</th>
 </tr>
 <tr>
  <td>1</td>
  <td>Bill Gates</td>
  <td>Founder Microsoft</td>
  <td>$1000</td>
 </tr>
 <tr>
  <td>2</td>
  <td>Steve Jobs</td>
  <td>Founder Apple</td>
  <td>$1200</td>
 </tr>
 <tr>
  <td>3</td>
  <td>Larry Page</td>
  <td>Founder Google</td>
  <td>$1100</td>
 </tr>
 <tr>
  <td>4</td>
  <td>Mark Zuckeberg</td>
  <td>Founder Facebook</td>
  <td>$1300</td>
 </tr>
</table>
300</td>
 </tr>
</table>

Output:

As a default, HTML 5 table not defined with border, you should add the border manually in each table cells.

HTML Table with Border

To add a basic border to HTML 5 table, simply add this style attribute in

tag.

<table style="border: solid 1px #aaa999;">

Output:

As you can see, Table Border only draw lines to the table only and cells left borderless. To make border for all cells, add style attribute to all and all .

<table style="border: solid 1px #aaa999;">
 <tr>
  <th style="border: solid 1px #aaa999;">No.</th>
  <th style="border: solid 1px #aaa999;">Full Name</th>
  <th style="border: solid 1px #aaa999;">Position</th>
  <th style="border: solid 1px #aaa999;">Salary</th>
 </tr>
 <tr>
  <td style="border: solid 1px #aaa999;">1</td>
  <td style="border: solid 1px #aaa999;">Bill Gates</td>
  <td style="border: solid 1px #aaa999;">Founder Microsoft</td>
  <td style="border: solid 1px #aaa999;"><table style="border: solid 1px #aaa999;">
 <tr>
  <th style="border: solid 1px #aaa999;">No.</th>
  <th style="border: solid 1px #aaa999;">Full Name</th>
  <th style="border: solid 1px #aaa999;">Position</th>
  <th style="border: solid 1px #aaa999;">Salary</th>
 </tr>
 <tr>
  <td style="border: solid 1px #aaa999;">1</td>
  <td style="border: solid 1px #aaa999;">Bill Gates</td>
  <td style="border: solid 1px #aaa999;">Founder Microsoft</td>
  <td style="border: solid 1px #aaa999;">$1000</td>
 </tr>
 <tr>
  <td style="border: solid 1px #aaa999;">2</td>
  <td style="border: solid 1px #aaa999;">Steve Jobs</td>
  <td style="border: solid 1px #aaa999;">Founder Apple</td>
  <td style="border: solid 1px #aaa999;">$1200</td>
 </tr>
 <tr>
  <td style="border: solid 1px #aaa999;">3</td>
  <td style="border: solid 1px #aaa999;">Larry Page</td>
  <td style="border: solid 1px #aaa999;">Founder Google</td>
  <td style="border: solid 1px #aaa999;">$1100</td>
 </tr>
 <tr>
  <td style="border: solid 1px #aaa999;">4</td>
  <td style="border: solid 1px #aaa999;">Mark Zuckeberg</td>
  <td style="border: solid 1px #aaa999;">Founder Facebook</td>
  <td style="border: solid 1px #aaa999;">$1300</td>
 </tr>
</table>
000</td>
 </tr>
 <tr>
  <td style="border: solid 1px #aaa999;">2</td>
  <td style="border: solid 1px #aaa999;">Steve Jobs</td>
  <td style="border: solid 1px #aaa999;">Founder Apple</td>
  <td style="border: solid 1px #aaa999;"><table style="border: solid 1px #aaa999;">
 <tr>
  <th style="border: solid 1px #aaa999;">No.</th>
  <th style="border: solid 1px #aaa999;">Full Name</th>
  <th style="border: solid 1px #aaa999;">Position</th>
  <th style="border: solid 1px #aaa999;">Salary</th>
 </tr>
 <tr>
  <td style="border: solid 1px #aaa999;">1</td>
  <td style="border: solid 1px #aaa999;">Bill Gates</td>
  <td style="border: solid 1px #aaa999;">Founder Microsoft</td>
  <td style="border: solid 1px #aaa999;">$1000</td>
 </tr>
 <tr>
  <td style="border: solid 1px #aaa999;">2</td>
  <td style="border: solid 1px #aaa999;">Steve Jobs</td>
  <td style="border: solid 1px #aaa999;">Founder Apple</td>
  <td style="border: solid 1px #aaa999;">$1200</td>
 </tr>
 <tr>
  <td style="border: solid 1px #aaa999;">3</td>
  <td style="border: solid 1px #aaa999;">Larry Page</td>
  <td style="border: solid 1px #aaa999;">Founder Google</td>
  <td style="border: solid 1px #aaa999;">$1100</td>
 </tr>
 <tr>
  <td style="border: solid 1px #aaa999;">4</td>
  <td style="border: solid 1px #aaa999;">Mark Zuckeberg</td>
  <td style="border: solid 1px #aaa999;">Founder Facebook</td>
  <td style="border: solid 1px #aaa999;">$1300</td>
 </tr>
</table>
200</td>
 </tr>
 <tr>
  <td style="border: solid 1px #aaa999;">3</td>
  <td style="border: solid 1px #aaa999;">Larry Page</td>
  <td style="border: solid 1px #aaa999;">Founder Google</td>
  <td style="border: solid 1px #aaa999;"><table style="border: solid 1px #aaa999;">
 <tr>
  <th style="border: solid 1px #aaa999;">No.</th>
  <th style="border: solid 1px #aaa999;">Full Name</th>
  <th style="border: solid 1px #aaa999;">Position</th>
  <th style="border: solid 1px #aaa999;">Salary</th>
 </tr>
 <tr>
  <td style="border: solid 1px #aaa999;">1</td>
  <td style="border: solid 1px #aaa999;">Bill Gates</td>
  <td style="border: solid 1px #aaa999;">Founder Microsoft</td>
  <td style="border: solid 1px #aaa999;">$1000</td>
 </tr>
 <tr>
  <td style="border: solid 1px #aaa999;">2</td>
  <td style="border: solid 1px #aaa999;">Steve Jobs</td>
  <td style="border: solid 1px #aaa999;">Founder Apple</td>
  <td style="border: solid 1px #aaa999;">$1200</td>
 </tr>
 <tr>
  <td style="border: solid 1px #aaa999;">3</td>
  <td style="border: solid 1px #aaa999;">Larry Page</td>
  <td style="border: solid 1px #aaa999;">Founder Google</td>
  <td style="border: solid 1px #aaa999;">$1100</td>
 </tr>
 <tr>
  <td style="border: solid 1px #aaa999;">4</td>
  <td style="border: solid 1px #aaa999;">Mark Zuckeberg</td>
  <td style="border: solid 1px #aaa999;">Founder Facebook</td>
  <td style="border: solid 1px #aaa999;">$1300</td>
 </tr>
</table>
100</td>
 </tr>
 <tr>
  <td style="border: solid 1px #aaa999;">4</td>
  <td style="border: solid 1px #aaa999;">Mark Zuckeberg</td>
  <td style="border: solid 1px #aaa999;">Founder Facebook</td>
  <td style="border: solid 1px #aaa999;"><table style="border: solid 1px #aaa999;">
 <tr>
  <th style="border: solid 1px #aaa999;">No.</th>
  <th style="border: solid 1px #aaa999;">Full Name</th>
  <th style="border: solid 1px #aaa999;">Position</th>
  <th style="border: solid 1px #aaa999;">Salary</th>
 </tr>
 <tr>
  <td style="border: solid 1px #aaa999;">1</td>
  <td style="border: solid 1px #aaa999;">Bill Gates</td>
  <td style="border: solid 1px #aaa999;">Founder Microsoft</td>
  <td style="border: solid 1px #aaa999;">$1000</td>
 </tr>
 <tr>
  <td style="border: solid 1px #aaa999;">2</td>
  <td style="border: solid 1px #aaa999;">Steve Jobs</td>
  <td style="border: solid 1px #aaa999;">Founder Apple</td>
  <td style="border: solid 1px #aaa999;">$1200</td>
 </tr>
 <tr>
  <td style="border: solid 1px #aaa999;">3</td>
  <td style="border: solid 1px #aaa999;">Larry Page</td>
  <td style="border: solid 1px #aaa999;">Founder Google</td>
  <td style="border: solid 1px #aaa999;">$1100</td>
 </tr>
 <tr>
  <td style="border: solid 1px #aaa999;">4</td>
  <td style="border: solid 1px #aaa999;">Mark Zuckeberg</td>
  <td style="border: solid 1px #aaa999;">Founder Facebook</td>
  <td style="border: solid 1px #aaa999;">$1300</td>
 </tr>
</table>
300</td>
 </tr>
</table>

If you want a simple coding without writing a style for each cells, use

CSS Units - Which ones to use and which to stop using! - HTML CSS Tutorial

In this tutorial, we'll cover all the CSS units, and, most importantly, which ones to use (and which NOT to use) for which situations.

In web development, css units are often confusing as there are just many options. And, many css units - like px vs em vs rem, all seem to get the job done at times. But some are simply better than others and there are very good reasons why.

================

Thanks for reading :heart: If you liked this post, share it with all of your programming buddies! Follow me on Facebook | Twitter

Learn More

☞ Advanced CSS and Sass: Flexbox, Grid, Animations and More!

☞ Build Responsive Real World Websites with HTML5 and CSS3

☞ CSS - The Complete Guide (incl. Flexbox, Grid & Sass)

☞ Beginner Full Stack Web Development: HTML, CSS, React & Node

☞ Modern HTML & CSS From The Beginning (Including Sass)

How To Create Login Form In HTML and CSS

How To Create Login Form In HTML and CSS

Learn how to Make login form using HTML CSS - Create sign in form design using HTML and CSS

In in tutorial you will learn to create a login form in HTML and CSS coding