NewbieCoder is requesting clarification on the JQUERY smoothscrolling code, can anyone assist?

Can anyone provide an explanation of the functionality of the following JavaScript code? Specifically, I would like a breakdown of each line in this smooth scrolling API.

    $('a').click(function(){        //upon 'a' click, execute this function
       $('html, body').animate({              // animate the content in the html and body
         scrollTop: $( $(this).attr('href') ).offset().top //retrieve and scroll to the specified coordinates
      }, 800);                               // scrolling speed
       return false;                        // unknown purpose of this line
     });
javascriptjqueryhtmlcssfrontend

Answer №1

Alright, let's begin. The initial two lines seem to align with your findings

$('a').click(function(){        //once 'a' is clicked, trigger this function
   $('html, body').animate({     // animate both the body and html elements?

The following line is a little complex. Let's dissect it

$(this).attr("href")

the value of the href attribute for the clicked element (a), which might be something like #test1 or #test2 in this case

$($(this).attr("href")

if the value is '#test1', the selector becomes $('#test1') which captures all elements with id=test1

$().offset().top

you obtain the offset method that provides the element's coordinates in relation to the document. The top variable represents the distance from the top of the document.

Therefore, the subsequent line calculates the total pixels required to scroll

     scrollTop: $( $(this).attr('href') ).offset().top
  }, 800);         // determining the scroll speed
   return false;    // prevents the anchor element from default navigation functionality to the specified href.
 });

I trust this clarifies things :P

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