0 

$(window).scroll(function(){
    $("#theFixed").css("bottom",Math.max(0,250-$(this).scrollTop()));
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.5.2/jquery.min.js"></script>
<div id="theFixed" style="position:fixed;top:250px;background-color:red">SOMETHING</div>

STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>STUFF <BR>

...ほぼ機能しtheFixedますが、スクロールの変更の高さを修正するにはどうすればよいですか？

編集：多分私は明確ではありませんでした、私は「ウィンドウ」または外側のコンテナの下部でコンテンツを修正する必要はありません、私はそのためにCSSを使用することができました。

4

1 に答える 1

1

CSSheightプロパティを使用して、目的の高さを明示的に設定できます。

$(window).scroll(function() {
  $("#theFixed").css("bottom", Math.max(0, 250 - $(this).scrollTop()));
});
#theFixed {
  height: 20px;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.5.2/jquery.min.js"></script>
<div id="theFixed" style="position:fixed;top:250px;background-color:red">SOMETHING</div>

STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>STUFF
<BR>

また、問題とは関係ありませんが、一般的なアドバイスとしてscroll、resizeなどのイベントのイベントリスナーを登録するときは、通常、イベントハンドラーの実行をデバウンスして、UIが他の種類のイベントに応答し続けるようにします。

イベントデバウンスの詳細。

于 2013-01-16T14:58:40.497 に答える