CODEWITHSUNDEEP
javascriptjqueryjquery-ui
Achaius
Achaius

Reputation: 6124

How to scroll the window automatically when mouse moves bottom of the page using jquery

I have 50 divs,But in my window it shows only 25,I do drag and drop activity on these divs.So If i drag my first div near 25th div,It should scroll automatically to show the remaining divs.How do i do this in jquery? any idea?

I am using Nestable not draggable()

Upvotes: 15

Views: 12942

Answers (4)

Alexis D.
Alexis D.

Reputation: 21

A bit of an improvement on Mencey's code. A caveat it might have is that it's based on an interval fired every 16 milliseconds instead of mousemove(). I don't know how taxing this may be, so feel free to increase the number of milliseconds or fire a clearInterval at some point. The benefit from this is the scrolling is continuous, instead of having to wiggle the mouse as 1j01 pointed out.

You may also change the speed and zone variables, zone being an area in pixels at the top and the bottom of the window where you can drag the item. As you get closer to the top or the bottom of the window, the scrolling speed goes up as it compares the distance between the position of the mouse and the actual edge of the window, giving some control to the user on the scrolling speed. 

var mouseY;
var speed = 0.15;
var zone = 50; 

$(document).mousemove(function(e){
   mouseY = e.pageY - $(window).scrollTop();
}).mouseover();

var dragInterval = setInterval(function(){

  if ($('.dd-dragel') && $('.dd-dragel').length > 0 && !$('html, body').is(':animated')) {
    var bottom = $(window).height() - zone;

  if (mouseY > bottom && ($(window).scrollTop() + $(window).height() < $(document).height() - zone)) {
    $('html, body').animate({scrollTop:  $(window).scrollTop() + ((mouseY + zone - $(window).height()) * speed)},0);
  }
  else if (mouseY < zone && $(window).scrollTop() > 0) {
     $('html, body').animate({scrollTop: $(window).scrollTop() + ( (mouseY - zone) * speed) },0);

  } else {
     $('html, body').finish();
  }
  }
},16);

Upvotes: 1

Mencey
Mencey

Reputation: 11

I know this is an old topic but since this feature keeps in standby, I just improved apaul34208's code, hope it helps

$(window).mousemove(function (e) {
    if ($('.dd-dragel') && $('.dd-dragel').length > 0 && !$('html, body').is(':animated')) {
        var bottom = $(window).height() - 50,
            top = 50;

        if (e.clientY > bottom && ($(window).scrollTop() + $(window).height() < $(document).height() - 100)) {
            $('html, body').animate({
                scrollTop: $(window).scrollTop() + 300
            }, 600);
        }
        else if (e.clientY < top && $(window).scrollTop() > 0) {
            $('html, body').animate({
                scrollTop: $(window).scrollTop() - 300
            }, 600);
        } else {
            $('html, body').finish();
        }
    }
});

Upvotes: 1

apaul
apaul

Reputation: 16170

This will need some fine tuning depending on your specific use case but it seems to work fairly well.

Working Example

$('.dd').nestable({ /* config options */
});

$(window).mousemove(function (e) {
    var x = $(window).innerHeight() - 50,
        y = $(window).scrollTop() + 50;
    if ($('.dd-dragel').offset().top > x) {
        //Down
        $('html, body').animate({
            scrollTop: 300 // adjust number of px to scroll down
        }, 600);
    }
    if ($('.dd-dragel').offset().top < y) {
        //Up
        $('html, body').animate({
            scrollTop: 0
        }, 600);
    } else {
        $('html, body').animate({

        });
    }
});

Related API documentation:

Upvotes: 12

Hamed Khosravi
Hamed Khosravi

Reputation: 545

If you want to know bottom of window you can check

$(window).height()

and $(window).scrollTop();

Upvotes: 2

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