Utilizing JQUERY to modify the 'top' attribute upon clicking

I am attempting to implement a vertical scroller using jQuery, but I'm encountering difficulties with my code.

function scrolldown() {     
    var newtop = $('.scroll-content').css('top') + '250';   
    $('.scroll-content').css({top: newtop});
}

The CSS:

.scroll-content {position:absolute; top:0px}

The issue lies in the JavaScript code. While I can easily modify values in Firebug, the code doesn't seem to be working as expected. My intention is to add 250px to the current value, but it's not functioning correctly. When I use .html(newtop), the output for the "top" value is displayed as 0px250... Any suggestions on what I might be doing wrong?

jquerycss

Answer №1

When you use $('.scroll-content').css('top'), it will give you a value like "123px", which is in string format due to the "px". However, if you add "250" to it, you end up with "123px250", which is not the desired outcome.

To achieve the correct result, consider using the following code:

var newTopValue = $('.scroll-content').position().top + 250;
$('.scroll-content').css('top', newTopValue + 'px');

Answer №2

To successfully increase the scroll position by 250 pixels, you must first convert the CSS string ('0px') to an integer (0), then add 250 to it, and finally append 'px' back to the result.

function increaseScroll() {
  var newScrollPos = parseInt($('.scroll-container').css('top')) + 250;
  $('.scroll-container').css({top: newScrollPos+'px'});
}

Answer №3

If you're looking for an alternative approach to the solutions already provided, consider using the += shorthand in conjunction with the .animate() function without specifying a duration, as shown below:

$(".scroll-content").animate({ top: "+=250px" }, 0);​

By doing this, you can instantly add 250px to the specified element's position. To animate the change instead, simply replace the 0 with a value like 400, which will result in a 400ms animation duration.

Answer №4

It is important to ensure you are adding an integer, not a string, to your top value. Follow the example below for guidance: 

let currentTop = $('.scroll-content').css('top');
let newTop = parseInt(currentTop) + 250;
$('.scroll-content').css({top: newTop}); }

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