How to Limit CSS Value Limits of Window Scrolling Animation?-CSS Tutorial-php.cn

How to Limit CSS Value Limits of Window Scrolling Animation?

Patricia Arquette

Release： 2024-11-11 20:18:03

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How to Limit CSS Value Limits of Window Scrolling Animation?

Limiting CSS Value Limits of Window Scrolling Animation

In this scenario, a user is experiencing an issue where a map element slides as they scroll down the page. However, the map continues to scroll indefinitely, preventing the user from reaching the bottom of the page due to the presence of a footer.

The goal is to limit the scrolling of the

representing the map when it reaches the bottom of another dynamically-sized

The provided JavaScript code animates the map to move as the user scrolls:

<pre class="brush:php;toolbar:false">$(function() {

    var $sidebar   = $("#map"),
        $window    = $(window),
        offset     = $sidebar.offset(),
        topPadding = 15;

    $window.scroll(function() {
        if ($window.scrollTop() > offset.top) {
            $sidebar.stop().animate({
                marginTop: $window.scrollTop() - offset.top + topPadding
            });
        }
        else {
            $sidebar.stop().animate({
                marginTop: 0
            });
        }
    });
});

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Addressing the Issue

Using the animate() method within the scroll function is not advisable as it can lead to conflicts due to continuous changes in the scroll value, preventing jQuery from performing repetitive animations. The stop() function alone might not resolve the issue entirely.

Instead, it is recommended to utilize the CSS method. Here's an example:

<pre class="brush:php;toolbar:false">$(window).scroll(function() {
    var scrollVal = $(this).scrollTop();
    if ( scrollVal > offset.top) {
        $sidebar.css({
           'margin-top': (($window.scrollTop() - offset.top) + topPadding) + 'px'
                       //added +'px' here to prevent old internet explorer bugs
        });
    } else {
        $sidebar.css({'margin-top':'0px'});
    }
});

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Additionally, avoid using multiple if else statements within your calculations, as this can also cause conflicts.

Alternative Approach

For scenarios where the goal is to fix a navigation element at a specific scroll position, consider the following approach:

<pre class="brush:php;toolbar:false">$(document).ready(function() {
   $(window).scroll(function() {
       var headerH = $('.header').outerHeight(true);
      //this will calculate header's full height, with borders, margins, paddings
       console.log(headerH);
       var scrollVal = $(this).scrollTop();
        if ( scrollVal > headerH ) {
        //when scroll value reach to your selector
            $('#subnav').css({'position':'fixed','top' :'0px'});
        } else {
            $('#subnav').css({'position':'static','top':'0px'});
        }
    });
 });

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