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如何使固定元素相對於當前頂部滾動位置停留？

[英]How to Make a Fixed Element Stay Relative to the Current Top Scroll Position?

 原文  2018-03-04 22:11:53  5   1    javascript/ jquery/ position/ fixed

問題描述

原始問題：

我有一個函數，在出現提示時打開一個覆蓋fixed位置的元素，我試圖弄清楚如何能夠在當前的top位置打開它，而不是跳到頁面top: 0 （ top: 0 ）每次.no-scroll類處於活動狀態時。

到目前為止，這是我已經取得的進步： 

var o = 0;
$("img.click").click(function() {
  var s = $("html, body");
  o = $(window).scrollTop(), s.css("position", "fixed"), s.css("background-position", "0 -" + o + "px");
  var i = $(this).attr("src");
  s.find("#img-open").attr("src", i), s.addClass("no-scroll"), $("#img-view").addClass("target");
});

而且我還對html和body標簽應用了.no-scroll類： 

html {
  height: initial;
}

body {
  height: auto;
}

body.no-scroll,
html.no-scroll {
  overflow: hidden;
  -webkit-overflow-scrolling: touch;
}

更新（適用於摘要的答案+附加說明）：

多虧了這個答案 ，我才能夠調整一些其他內容：

  1. 不需要html標簽上的no-scroll類。 因此，將其刪除。
  2. 我在touchmove觸摸事件中添加了preventDefault() ，以防止body背景內容在iOS Safari等移動瀏覽器上滾動（截至2018年）。 

 $(document).ready(function() { $("a.lbimg > img.lb-click").click(function() { $("#lb-view").addClass("target"); var o = document.documentElement.scrollTop || document.body.scrollTop; $('body').addClass('no-scroll'); document.documentElement.scrollTop = document.body.scrollTop = o; $('body').bind('touchmove', function(e) { e.preventDefault(); }); }); $(".lbimg-wrap, #lb-controls").on("click", function(s) { $("#lb-view").removeClass("target"); $('body').removeClass('no-scroll'); $('body').unbind('touchmove'); }); }); 
 body { height: auto; } body, html { width: 100%; background-size: cover; background-repeat: no-repeat; } body { background: #808080; margin: 0; padding: 0; border: 0; } body.no-scroll { overflow: hidden; } p.content { color: white; } img { padding: 5px; border: 1px solid; box-sizing: border-box; z-index: 1; } .img-wrap { display: block; } .img-wrap img { line-height: 0; display: block; } a.lbimg { cursor: pointer; display: block; line-height: 0; } a.lbimg img { margin: 0 auto; padding: 0; border: 0; } .lb-click { width: 25%; height: auto; } .customlightbox { top: 0; bottom: 0; -webkit-box-sizing: border-box; box-sizing: border-box; position: fixed; left: 0; right: 0; background: rgba(0, 0, 0, 0.7); opacity: 0; z-index: -1; } .lbimg-wrap { width: 100%; height: 100%; padding: 47px; -webkit-box-sizing: border-box; box-sizing: border-box; position: relative; text-align: center; } .customlightbox img { border-color: white; width: auto; margin: auto; max-width: 100%; max-height: 100%; opacity: 0; position: relative; top: 50%; -webkit-transform: translateY(-50%); -ms-transform: translateY(-50%); transform: translateY(-50%); } #lb-controls { cursor: pointer; -webkit-box-sizing: border-box; box-sizing: border-box; position: fixed; height: 50px; width: 50px; top: -50px; right: -3px; border-left: 1px solid; border-bottom: 1px solid; border-color: white; z-index: 3; } #lb-close { display: block; position: absolute; overflow: hidden; height: 30px; width: 30px; right: 10px; top: 10px; -webkit-transform: rotate(45deg); -ms-transform: rotate(45deg); transform: rotate(45deg); } #lb-close:before, #lb-close:after { content: ''; display: block; position: absolute; background: white; -webkit-border-radius: 2px; -moz-border-radius: 2px; border-radius: 2px; } #lb-close:before { width: 2px; height: 0; top: 0; left: 14px; } #lb-close:after { width: 0; height: 2px; top: 14px; left: 0; } .customlightbox.target { display: inline-block; z-index: 2; } .customlightbox.target, .customlightbox.target img { opacity: 1; } .customlightbox.target~#lb-controls { top: -3px; } .customlightbox.target~#lb-controls #lb-close:after { width: 30px; } .customlightbox.target~#lb-controls #lb-close:before { height: 30px; } .lb-animate { -webkit-transition: 0.5s ease-in-out; -o-transition: 0.5s ease-in-out; transition: 0.5s ease-in-out; } 
 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <body> <p class="content"> Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. </p> <div class="img-wrap"> <a class="lbimg"> <img class="lb-click" src="https://78.media.tumblr.com/8b1b8cbb2b963ab64eb2341f608638bf/tumblr_p4wbo7ZLJS1qccr26o1_1280.jpg"> </a> <div class="customlightbox lb-animate" id="lb-view"> <div class="lbimg-wrap"> <img class="lb-animate" id="lbimg-open" src="https://78.media.tumblr.com/8b1b8cbb2b963ab64eb2341f608638bf/tumblr_p4wbo7ZLJS1qccr26o1_1280.jpg"> </div> </div> <div id="lb-controls" class="lb-animate"> <a id="lb-close" class="lb-animate"></a> </div> </div> <p class="content"> Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. </p> </body>

1 個解決方案

解決方案1
 1 已采納  2018-03-04 23:35:09

您幾乎在那里： 

 $(document).ready(function() { $("a.lbimg > img.lb-click").click(function() { $("#lb-view").addClass("target"); var o = document.documentElement.scrollTop || document.body.scrollTop; $('html, body').addClass('no-scroll'); document.documentElement.scrollTop = document.body.scrollTop = o; }); $(".lbimg-wrap, #lb-controls").on("click", function(s) { $("#lb-view").removeClass("target"); $('html, body').removeClass('no-scroll'); }); }); 
 html { height: initial; } body { height: auto; } body, html { width: 100%; background-size: cover; background-repeat: no-repeat; } body { background: #808080; margin: 0; padding: 0; border: 0; } body.no-scroll, html.no-scroll { overflow: hidden; } p.content { color: white; } img { padding: 5px; border: 1px solid; box-sizing: border-box; z-index: 1; } .img-wrap { display: block; } .img-wrap img { line-height: 0; display: block; } a.lbimg { cursor: pointer; display: block; line-height: 0; } a.lbimg img { margin: 0 auto; padding: 0; border: 0; } .lb-click { width: 25%; height: auto; } .customlightbox { top: 0; bottom: 0; -webkit-box-sizing: border-box; box-sizing: border-box; position: fixed; left: 0; right: 0; background: rgba(0, 0, 0, 0.7); opacity: 0; z-index: -1; } .lbimg-wrap { width: 100%; height: 100%; padding: 47px; -webkit-box-sizing: border-box; box-sizing: border-box; position: relative; text-align: center; } .customlightbox img { border-color: rgba(255, 255, 255, .5); width: auto; margin: auto; max-width: 100%; max-height: 100%; opacity: 0; position: relative; top: 50%; -webkit-transform: translateY(-50%); -ms-transform: translateY(-50%); transform: translateY(-50%); } #lb-controls { cursor: pointer; -webkit-box-sizing: border-box; box-sizing: border-box; position: fixed; height: 50px; width: 50px; top: -50px; right: -3px; border-left: 1px solid; border-bottom: 1px solid; opacity: .7; border-color: rgba(255, 255, 255, .7) !important; z-index: 3; } #lb-close { display: block; position: absolute; overflow: hidden; height: 30px; width: 30px; right: 10px; top: 10px; -webkit-transform: rotate(45deg); -ms-transform: rotate(45deg); transform: rotate(45deg); } #lb-close:before, #lb-close:after { content: ''; display: block; position: absolute; background: white; -webkit-border-radius: 2px; -moz-border-radius: 2px; border-radius: 2px; } #lb-close:before { width: 2px; height: 0; top: 0; left: 14px; } #lb-close:after { width: 0; height: 2px; top: 14px; left: 0; } .customlightbox.target { opacity: 1; display: inline-block; z-index: 2; } .customlightbox.target img { opacity: 1; } .customlightbox.target~#lb-controls { top: -3px; } .customlightbox.target~#lb-controls #lb-close:after { width: 30px; } .customlightbox.target~#lb-controls #lb-close:before { height: 30px; } .lb-animate { -webkit-transition: 0.5s ease-in-out; -o-transition: 0.5s ease-in-out; transition: 0.5s ease-in-out; } 
 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <body> <p class="content"> Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. </p> <div class="img-wrap"> <a class="lbimg"> <img class="lb-click" src="https://78.media.tumblr.com/8b1b8cbb2b963ab64eb2341f608638bf/tumblr_p4wbo7ZLJS1qccr26o1_1280.jpg"> </a> <div class="customlightbox lb-animate" id="lb-view"> <div class="lbimg-wrap"> <img class="lb-animate" id="lbimg-open" src="https://78.media.tumblr.com/8b1b8cbb2b963ab64eb2341f608638bf/tumblr_p4wbo7ZLJS1qccr26o1_1280.jpg"> </div> </div> <div id="lb-controls" class="lb-animate"> <a id="lb-close" class="lb-animate"></a> </div> </div> <p class="content"> Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. Content to scroll. </p> </body>

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