The following jQuery code snippet can be used to add scrollbars when the div content exceeds the container element area. (No demonstration, please copy it directly to Firebug)

//D = document
//W = window
//$ = jQuery

var contentArea = $(this),
    wintop = contentArea.scrollTop(),
    docheight = $(D).height(),
    winheight = $(W).height(),
    divheight = $('#content').height(),
    scrollheight = $('#content')[0].scrollHeight,
    scrolltrigger = 0.9;

console.log('wintop ' + wintop);
console.log('docheight ' + docheight);
console.log('winheight ' + winheight);
console.log('divheight ' + divheight);
console.log('scrollheight ' + scrollheight);

console.log((wintop + divheight)/scrollheight);

if  (((wintop + divheight)/scrollheight) > scrolltrigger) {
    // 顯示滾動(dòng)條
}

More readings: http://miracleart.cn/link/45d0bb417c9fab94dae50e5974f30ec7 http://miracleart.cn/link/09ff53617a5f5038297df773580f61a6

jQuery Scrollbar FAQs (FAQs)

How to add scrollbars to div using jQuery?

To add scrollbars to a div using jQuery, you need to use the CSS property overflow. You can set this property to auto or scroll. auto Add scrollbars only if the content is greater than a div, while scroll will always display the scrollbars. Here is a simple example:

$("#divID").css("overflow", "auto");

In this example, replace "divID" with the ID of your div. This adds a scrollbar to the div when the content is larger than the div.

How to use jQuery to scroll to a specific div?

Use jQuery to scroll to a specific div, you can use the animate function as well as the scrollTop attribute. Here is an example:

$('html, body').animate({
  scrollTop: $("#divID").offset().top
}, 2000);

In this example, replace "divID" with the ID of your div. This will scroll smoothly to the div in 2 seconds.

How to dynamically add scrollbars to div using jQuery?

Use jQuery to dynamically add scrollbars to the div, you can change the css attribute using the overflow function. Here is an example:

$("#divID").css("overflow", "auto");

In this example, replace "divID" with the ID of your div. This adds a scrollbar to the div when the content is larger than the div.

How to use jQuery to scroll to div with smooth animation?

To use jQuery to scroll to a div with smooth animation, you can use the animate function as well as the scrollTop attribute. Here is an example:

$('html, body').animate({
  scrollTop: $("#divID").offset().top
}, 2000);

In this example, replace "divID" with the ID of your div. This will scroll smoothly to the div in 2 seconds.

How to add horizontal scrollbars to div using jQuery?

Use jQuery to add horizontal scrollbars to the div, you can use the css function to change the overflow-x property to scroll. Here is an example:

$("#divID").css("overflow-x", "scroll");

In this example, replace "divID" with the ID of your div. This will add a horizontal scrollbar to the div.

How to use jQuery to hide the scrollbar of a div?

Use jQuery to hide the scrollbar of the div, you can use the css function to change the overflow property to hidden. Here is an example:

$("#divID").css("overflow", "hidden");

In this example, replace "divID" with the ID of your div. This will hide the scrollbar of the div.

How to use jQuery to check if there are scroll bars in a div?

Use jQuery to check if the div has scrollbars, you can compare the scrollHeight or scrollWidth of the div with its clientHeight or clientWidth. If scrollHeight or scrollWidth is larger, the div has a scroll bar. Here is an example:

//D = document
//W = window
//$ = jQuery

var contentArea = $(this),
    wintop = contentArea.scrollTop(),
    docheight = $(D).height(),
    winheight = $(W).height(),
    divheight = $('#content').height(),
    scrollheight = $('#content')[0].scrollHeight,
    scrolltrigger = 0.9;

console.log('wintop ' + wintop);
console.log('docheight ' + docheight);
console.log('winheight ' + winheight);
console.log('divheight ' + divheight);
console.log('scrollheight ' + scrollheight);

console.log((wintop + divheight)/scrollheight);

if  (((wintop + divheight)/scrollheight) > scrolltrigger) {
    // 顯示滾動(dòng)條
}

In this example, replace "divID" with the ID of your div. This will check if the div has a vertical scrollbar.

How to use jQuery to make the scrollbar of a div always visible?

To make the scrollbar of the div always visible, you can change the css property to overflow using the scroll function. Here is an example:

$("#divID").css("overflow", "auto");

In this example, replace "divID" with the ID of your div. This will make the scrollbar of the div always visible.

How to change the color of a div scrollbar using jQuery?

You cannot change the color of the scrollbar directly using jQuery because it is an element at the browser and operating system level. However, you can use CSS in some browsers such as Chrome, Edge, or Safari to achieve this. Here is an example:

$('html, body').animate({
  scrollTop: $("#divID").offset().top
}, 2000);

In this example, replace "divID" with the ID of your div. This will change the scrollbar color of the div in Chrome, Edge, and Safari.

How to use jQuery to scroll to the bottom of a div?

Scroll to the bottom of the div using jQuery, you can use the scrollTop function as well as the scrollHeight attribute. Here is an example:

$("#divID").css("overflow", "auto");

In this example, replace "divID" with the ID of your div. This will scroll to the bottom of the div.

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