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SELECTORS - :not(selector) Selector

The 'not(selector) Selector' is used to select the elements, which doesn't match the conditions specified in a selector.

Let us simplify with the below example.

Example :

<html>
  	<head>
    	<title> My First Programme </title>
  	</head>

  	<body>
    	<h1> JQuery </h1>
    	
    	<div class = "newClass">
    		<p class = "para1"> First Paragraph </p>
    		<p class = "para2"> Second Paragraph </p>
    		<p class = "para3"> Third Paragraph </p>
    	</div>	
    	
    	<button> Click me </button>

      	<script src = "https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"> </script>
	  
      	<script>
      
			$('button').click( function() { 
            	$('p:not(p:first-child)').text("The second and third child of div element got replaced")
            });
            
      	</script>      
  	</body>
</html>

Output :

So, if you see the above code. We can see that there are three <p> elements, those are inside a <div> element.

<div class = "newClass">
	<p class = "para1"> First Paragraph </p>
	<p class = "para2"> Second Paragraph </p>
	<p class = "para3"> Third Paragraph </p>
</div>

Now, if you consider the DOM,

The <div> element has three children of type <p>.

<p class = "para1"> First Paragraph </p>
<p class = "para2"> Second Paragraph </p>
<p class = "para3"> Third Paragraph </p>

And the first child of <div> element is,

<p class = "para1"> First Paragraph </p>

And on button click, the contents of second and third <p> element gets replaced with 'The second and third child of div element got replaced'.

And this happened with the 'p:not(p:first-child)' element selector.

$('button').click( function() {
	$('p:not(p:first-child)').text("The second and third child of div element got replaced")
});

The moment the button is clicked, JQuery statement gets triggered.

$('p:not(p:first-child)').text("The second and third child of div element got replaced")

So it is a two step process :

The JQuery code locates the first child of <div>, with the selector 'p:first-child',
```
<p class = "para1"> First Paragraph </p>
```

Then it uses the ':not' selector, $('p:not(p:first-child)'),

$('p:not(p:first-child)').text("The second and third child of div element got replaced")

And selects only those <p> elements those doesn't match the selector 'p:first-child'.

<p class = "para2"> Second Paragraph </p>
<p class = "para3"> Third Paragraph </p>

In simple words, it excludes the first element,

<p class = "para1"> First Paragraph </p>

And displays all other <p> elements.

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SELECTORS - :not(selector) Selector

Example :

Output :

The JQuery code locates the first child of <div>, with the selector 'p:first-child',

Then it uses the ':not' selector, $('p:not(p:first-child)'),