fixed | 易学教程

jQuery Select Elements with a certain CSS

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I'm trying to add a bit of jQuery code to all elements that have position:fixed set on them. Is this sort of thing possible? It would be very helpful if there is, so I don't have to go through all my code and an extra class to the objects that are fixed. This one should cover all cases: $('*').filter(function() { return $(this).css("position") === 'fixed'; }); Not as fast as qwertymk's answer, but also work if the css property is inherited from another rule, as demonstrated here . qwertymk Faster and safer than Colin's answer: $('*').filter(function(){ return this.style && this.style.position

How to resolve position:fixed for a bottom toolbar on iOS (iPhone/iPad)

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问题 I have a bar that is fixed to the bottom of every page on my website by using position:fixed. The problem is that on devices like iPhone or iPad this property is not respected. I tried to use javascript to detec the screen height, scroll position, and this works perfectly on the iPad: $( window ).scroll( function ( ) { $( "#bar" ).css( "top", ( $( window ).height() + $( document ).scrollTop() - 90 ) +"px" ); } ); As you can see I'm using jQuery. The problem is that this code does not quite

How to make a div have a fixed size?

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问题 I made a site so when you click the button 30px it changes the font inside the div . I have a ul inside it with the bottons. When I change the size of font the div expands and the nav buttons move with it as well. How do i make it so it stays fixed but the fonts can still change. 回答1: Try the following css: #innerbox { width:250px; /* or whatever width you want. */ max-width:250px; /* or whatever width you want. */ display: inline-block; } This makes the div take as little space as possible,

用 python 拟合等角螺线

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文章目录飞蛾为什么要扑火？螺线及等角螺线绘制等角螺线拟合等角螺线飞蛾为什么要扑火？暗梁闻语燕，夜烛见飞蛾。飞蛾绕残烛，半夜人醉起。人类很早就注意到飞蛾扑火这一奇怪的现象，并且自作主张地赋予了飞蛾扑火很多含义，引申出为了理想和追求义无反顾、不畏牺牲的精神。但是，这种引申和比喻，征求过飞蛾的意见吗？后来，生物学家又提出来昆虫趋光性这一假说来解释飞蛾扑火。不过，这个假说似乎也不成立。如果昆虫真的追逐光明，估计地球上早就没有昆虫了——它们应该齐刷刷整体移民到太阳或月亮上去了。仔细观察飞蛾扑火，就会发现，昆虫们并不是笔直地飞向光源，而是绕着光源飞行，同时越来越接近光源，最终酿成了“惨案”。这一行为被解释成“失误”似乎更合理一点。既然火烛危险，那么飞蛾为什么要绕着火烛飞行呢？最新的解释是，飞蛾在夜晚飞行时是依据月光和星光作为参照物进行导航的。星星和月亮离我们非常远，光到了地面上可以看成平行光，当飞蛾的飞行路径保持与光线方向成恒定夹角时，飞蛾就变成了直线飞行，如下图所示。然而，当飞蛾遇到了火烛等危险光源时，还是按照以前的飞行方式，路径保持与光线方向成恒定夹角，以为依旧能飞成一条直线，结果悲剧了。此时它的飞行轨迹并不是一条直线，而是一条等角螺旋线，如下图所示。可怜的飞蛾！亿万年进化出来的精准导航，在人工光源的干扰下竟如此不堪。螺线及等角螺线螺线家族很庞大，比如

mobile web曾经的踩过坑

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兼容性一直是前端工程师心中永远的痛.手机浏览器,因为基本是webkit(blink)内核当道,很多公司,不用考虑IE系的浏览器,所以感觉兼容性上的问题可能会少一些. 但是手机端,虽然出了很多工具,但是调试依然比PC端麻烦很多.而且很多坑是因为手机浏览器本身的bug,一旦出现,相应的解决方案很难根据以前的经验进行推测.只能寄希望于谷歌 + 猜. 这里记录一下我做手机端浏览器曾经踩过的坑.之所以用”曾经”,随着版本的更新,有些问题没了. 另外我(我司)没有足够的人力和物力对很多手机浏览器进行测试,我也只需要兼容iPhone 4s(老大有一个4s的玩物,不然可以从5开始!-!)以上系列和很新的安卓手机.这点和大公司没法比,群里有个百度的朋友,低版本的安卓和 windows phone都要兼容…所以这篇文章当抛砖引玉了 (1)position:fixed position:fixed 应该是反映最多的问题.但是手机屏幕很小,对于一些要重点突出的地方,还特别需要fixed在视口的某个位置, 我遇到的问题包括: 呼出系统输入法后,fixed元素位置乱飘. fixed的元素是后弹出的,点击发生击穿现象(会触发弹层下面元素的click) 涉及整页动画时,元素位置乱飘如果祖先元素使用了 transform 相关的样式,fixed元素的不按照视口来定位. 解决的思路用代码,触发一下滚动

iOS input focused inside fixed parent stops position update of fixed elements

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The following happens on Mobile Safari iOS 6.1.2 Steps to reproduce Create a position: fixed element with an <input type="text"> element inside it. Actual result Input - not focused The position of the fixed elements is correct when input is not focused. Input - focused When the input is focused, the browser enters a special mode in which it does not update the position of the fixed elements any more (any fixed positioned element, not just the input's parent) and moves the whole viewport down in order to make the input's parent element sit in the center of the screen. See live demo: http:/

Print header/footer on all pages (Print Mode)

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<div id="header">header</div> <div id="content"> content spanning several pages... </div> <div id="footer">Footer - Fixed at the bottom of each page</div> I want to print #header and #footer on every page in print mode. I searched a lot but nothing seems to work, even position:fixed doesn't work as expected. Pat If you're willing to switch over to tables for your layout (not necessarily ideal), you can do it with the <thead> and <tfoot> elements. They'll print at the top and bottom of every page: <table> <thead>  </thead> <tbody> <!-- Page content --

Fixed Position Background on iOS

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I have a website that has a full-image fixed background that the content "floats" above. It works fine in desktop browsers, but the fixed background ends up scrolling on iPads and other tablets. This seems to be a common issue, but then I ran across this website, which seems to have a fixed background even on iPad's. http://confitdemo.wordpress.com/ Any clue how they are pulling that off? I tried: #content-wrapper.posts-page { background-attachment: fixed !important; background-clip: border-box; background-color: transparent; background-image: url("image path"); background-origin: padding-box;

Web移动端Fixed布局的解决方案

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iOS下的 Fixed + Input BUG现象让我们先举个栗子，最直观的说明一下这个 BUG 的现象。常规的 fixed 布局，可能使用如下布局（以下仅示意代码）： <body class="layout-fixed">  <header> </header>  <main>  </main>  <footer> <input type="text" placeholder="Footer..."/> <button class="submit">提交</button> </footer> </body> 对应的样式如下： header, footer, main { display: block; } header { position: fixed; height: 50px; left: 0; right: 0; top: 0; } footer { position: fixed; height: 34px; left: 0; right: 0; bottom: 0; } main { margin-top: 50px; margin-bottom: 34px; height: 2000px } 然后看起来就是下面这个样子

JQuery Position:Fixed 'NAVBAR' by scrolling the page

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Basically I want my NAVBAR to stay at the top of the window position:fixed as soon as the #CONTENT DIV under the NAV get to the top of the window. The HTML is <header> Which is full screen size: 100% x 100% </header> <nav> </nav> <div id="content"> <section> </section> <footer> </footer> </div> Here you can find the DEMO http://jsfiddle.net/dcdeiv/aG6DK/2/ Everything works fine, except the jQuery code. I tried to create a variable from the return of the height value of the #contentDiv while scrolling. I wanted to use that variable to make the NAV fadeIn or fadeOut as soon as the #contentDiv

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