javascript - move element right and left while scrolling issue - Stack Overflow

admin管理员组

文章数量:1418622

I'm trying to move an element to left and right while scrolling up and down in this example FIDDLE the problem is the div will keep moving to reach out of the page and doesn't return to its original position. This is the example I'm trying to simulate Original Example

HTML

<div class='container'>
<div class='inner'>
</div>
</div>

JS

var lastScrollTop = 0;
$(window).scroll(function(event){
var st = $(this).scrollTop();
if (st > lastScrollTop){
    var offset = $(".inner").offset();
    var w = $(window);
    var x = offset.left;
    console.log(x);
    $(".inner").css("left",x+50);
} else {
    var offset = $(".inner").offset();
    var w = $(window);
    var y = offset.left;
    console.log(y);
    $(".inner").css("left",y-50);
}
lastScrollTop = st;
});

CSS

.container{width:100%; position: relative; float:left; background:#fff; height:1200px;}
.inner{width:150px; height:100px; position:absolute; top:20%; left:10%; background:red;}

I'm trying to move an element to left and right while scrolling up and down in this example FIDDLE the problem is the div will keep moving to reach out of the page and doesn't return to its original position. This is the example I'm trying to simulate Original Example

HTML

<div class='container'>
<div class='inner'>
</div>
</div>

JS

var lastScrollTop = 0;
$(window).scroll(function(event){
var st = $(this).scrollTop();
if (st > lastScrollTop){
    var offset = $(".inner").offset();
    var w = $(window);
    var x = offset.left;
    console.log(x);
    $(".inner").css("left",x+50);
} else {
    var offset = $(".inner").offset();
    var w = $(window);
    var y = offset.left;
    console.log(y);
    $(".inner").css("left",y-50);
}
lastScrollTop = st;
});

CSS

.container{width:100%; position: relative; float:left; background:#fff; height:1200px;}
.inner{width:150px; height:100px; position:absolute; top:20%; left:10%; background:red;}

• javascript
• jquery
• css
• animation
• scroll

Share Improve this question Follow asked Jan 5, 2016 at 17:03 PHP UserPHP User 2,42266 gold badges5252 silver badges9999 bronze badges

Add a ment  | 

1 Answer 1

Sorted by: Reset to default 5

You need to offset it by the scrolled amount, not move it by an amount each time. You are queuing up multiple moves and adding 50px each time.

var offset = $(".inner").offset();
$(window).scroll(function(event) {
  var st = $(this).scrollTop();
  $(".inner").css("left", st + offset.left);
});

JSFiddle: https://jsfiddle/TrueBlueAussie/x0vtopzv/1/

Once it is locked to the scrolling, you can adjust the position using a multiplier on the st value.

Note: JSFiddle has an 8px margin on the body. That throws out the offset position and needs to be removed or taken into account.

https://jsfiddle/TrueBlueAussie/x0vtopzv/6/

本文标签： javascriptmove element right and left while scrolling issueStack Overflow