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JavaScriptでスクロール量を取得する

JavaScript

Last updated at 2019-04-10Posted at 2015-09-29

概要

JavaScriptでスクロール量を取得する簡易コードの個人的まとめです。

左からのスクロール量

var getScrollLeft = function(window) {
  var pageXOffset = window.pageXOffset;
  var document = window.document;
  var body = document.body;

  if (pageXOffset !== undefined) {
    return pageXOffset;
  }

  /**
   * @see https://dev.opera.com/articles/fixing-the-scrolltop-bug/
   */
  var scrollingElement =
    'scrollingElement' in document
      ? document.scrollingElement
      : window.navigator.userAgent.indexOf('WebKit') != -1
      ? body
      : document.documentElement || body.parentNode;

  return scrollingElement.scrollLeft;
};

minify

var getScrollLeft=function(c){var d=c.pageXOffset,b=c.document,e=b.body;return void 0!==d?d:("scrollingElement"in b?b.scrollingElement:-1!=c.navigator.userAgent.indexOf("WebKit")?e:b.documentElement||e.parentNode).scrollLeft};

右からのスクロール量

var getScrollRight = function(window) {
  var document = window.document;
  var body = document.body;
  var html = document.documentElement || body.parentNode;

  /**
   * @see https://dev.opera.com/articles/fixing-the-scrolltop-bug/
   */
  var scrollingElement =
    'scrollingElement' in document
      ? document.scrollingElement
      : window.navigator.userAgent.indexOf('WebKit') != -1
      ? body
      : html;

  var maxScrollLeft = scrollingElement.scrollWidth - html.clientWidth;

  return maxScrollLeft - getScrollLeft(window);
};

minify

var getScrollRight=function(c){var b=c.document,d=b.body,e=b.documentElement||d.parentNode;return("scrollingElement"in b?b.scrollingElement:-1!=c.navigator.userAgent.indexOf("WebKit")?d:e).scrollWidth-e.clientWidth-getScrollLeft(c)};

上からのスクロール量

var getScrollTop = function(window) {
  var pageYOffset = window.pageYOffset;
  var document = window.document;
  var body = document.body;

  if (pageYOffset !== undefined) {
    return pageYOffset;
  }

  /**
   * @see https://dev.opera.com/articles/fixing-the-scrolltop-bug/
   */
  var scrollingElement =
    'scrollingElement' in document
      ? document.scrollingElement
      : window.navigator.userAgent.indexOf('WebKit') != -1
      ? body
      : document.documentElement || body.parentNode;

  return scrollingElement.scrollTop;
};

minify

var getScrollTop=function(c){var d=c.pageYOffset,b=c.document,e=b.body;return void 0!==d?d:("scrollingElement"in b?b.scrollingElement:-1!=c.navigator.userAgent.indexOf("WebKit")?e:b.documentElement||e.parentNode).scrollTop};

下からのスクロール量

var getScrollBottom = function(window) {
  var document = window.document;
  var body = document.body;
  var html = document.documentElement || body.parentNode;

  /**
   * @see https://dev.opera.com/articles/fixing-the-scrolltop-bug/
   */
  var scrollingElement =
    'scrollingElement' in document
      ? document.scrollingElement
      : window.navigator.userAgent.indexOf('WebKit') != -1
      ? body
      : html;

  var maxScrollTop = scrollingElement.scrollHeight - html.clientHeight;

  return maxScrollTop - getScrollTop(window);
};

minify

var getScrollBottom=function(c){var b=c.document,d=b.body,e=b.documentElement||d.parentNode;return("scrollingElement"in b?b.scrollingElement:-1!=c.navigator.userAgent.indexOf("WebKit")?d:e).scrollHeight-e.clientHeight-getScrollTop(c)};

デモ

JavaScript get scroll values

参考

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