HTML METHODS - offset()

The offset() method in JQuery is used to get and set the offset position of an HTML element.

Say, you want to get the exact position of the <p> element. And the offset() method helps us to get that.

The offset() method has two properties, top and left. The top property tells us the position of the <p> element from the top(In pixels) and the left element tells us the position of the <p> element from the left(In pixels).

Let us see how offset() method acts as a getter method.

offset() as Getter method

Example :

<html>
  	<head>
    	<title> My First Programme </title>
    	
    	<script src = "https://cdnjs.cloudflare.com/ajax/libs/JQUERY/3.3.1/jquery.min.js"> </script>
  	</head>

  	<body>
    	<h1> JQuery </h1>
    	
    	<p> Hello World </p>
        
        <button> Click it </button> 
	  
      	<script>
      
			$('button').click( function() { 
				var x = $('p').offset();
            	alert("The offset value of p element is, top : "+x.top+" and from left : "+x.left);
            });
            
      	</script>
  	</body>
</html>

Output :

So, if we look at the above code, we have a <p> element.

<p> Hello World </p>

And we have a <button> element,

<button> Click it </button>

And on button click, the JQuery statement gets triggered,

$('button').click( function() {
	var x = $('p').offset();
	alert("The offset value of p element is, top : "+x.top+" and from left : "+x.left);
});

So, what we have done is, invoked the offset() method on the <p> element. And stored it in a variable x,

var x = $('p').offset();

Note : Just remember the offset() method has two properties, top and left.

And an alert is generated,

alert("The offset value of p element is, top : "+x.top+" and from left : "+x.left);

Now, if we see the output (i.e. The alert),

You get the position of the <p> element in pixels. Where x.top and x.left is used to get the value of top and left from the offset() method.

offset() as Setter method

Example :

<html>
  	<head>
    	<title> My First Programme </title>
    	
    	<script src = "https://cdnjs.cloudflare.com/ajax/libs/JQUERY/3.3.1/jquery.min.js"> </script>
  	</head>

  	<body>
    	<h1> JQuery </h1>
    	
    	<p> Hello World </p>
        
        <button> Click it </button> 
	  
      	<script>

                $('button').click(function(){
                  $('p').offset({top: 150, left: 50});
                });
                
      	</script>
  	</body>
</html>

Output :

So, if we look at the above code, we have a <p> element.

<p> Hello World </p>

And we have a <button> element,

<button> Click it </button>

And on button click, the JQuery statement gets triggered,

$('button').click( function() {
	$('p').offset({top: 150, left: 50});
});

And the offset() method is used to set the left and top property of the <p> element.

$('p').offset({top: 150, left: 50});

Now, if we see the output, the <p> element is placed at a position that is 150 pixels away from the top and 50 pixels away from the left.

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