In IOS8 Safari there is a new bug with position fixed.
If you focus a textarea that is in a fixed panel, safari will scroll you to the bottom of the page.
This makes all sorts of UIs impossible to work with, since you have no way of entering text into textareas without scrolling your page all the way down and losing your place.
Is there any way to workaround this bug cleanly?
#a {
height: 10000px;
background: linear-gradient(red, blue);
}
#b {
position: fixed;
bottom: 20px;
left: 10%;
width: 100%;
height: 300px;
}
textarea {
width: 80%;
height: 300px;
}
<html>
<body>
<div id="a"></div>
<div id="b"><textarea></textarea></div>
</body>
</html>
Based on this good analysis of this issue, I've used this in html and body elements in css:
html,body{
-webkit-overflow-scrolling : touch !important;
overflow: auto !important;
height: 100% !important;
}
I think it's working great for me.
The best solution I could come up with is to switch to using position: absolute; on focus and calculating the position it was at when it was using position: fixed;. The trick is that the focus event fires too late, so touchstart must be used.
The solution in this answer mimics the correct behavior we had in iOS 7 very closely.
Requirements:
The body element must have positioning in order to ensure proper positioning when the element switches to absolute positioning.
body {
position: relative;
}
The Code (Live Example):
The following code is a basic example for the provided test-case, and can be adapted for your specific use-case.
//Get the fixed element, and the input element it contains.
var fixed_el = document.getElementById('b');
var input_el = document.querySelector('textarea');
//Listen for touchstart, focus will fire too late.
input_el.addEventListener('touchstart', function() {
//If using a non-px value, you will have to get clever, or just use 0 and live with the temporary jump.
var bottom = parseFloat(window.getComputedStyle(fixed_el).bottom);
//Switch to position absolute.
fixed_el.style.position = 'absolute';
fixed_el.style.bottom = (document.height - (window.scrollY + window.innerHeight) + bottom) + 'px';
//Switch back when focus is lost.
function blured() {
fixed_el.style.position = '';
fixed_el.style.bottom = '';
input_el.removeEventListener('blur', blured);
}
input_el.addEventListener('blur', blured);
});
Here is the same code without the hack for comparison.
Caveat:
If the position: fixed; element has any other parent elements with positioning besides body, switching to position: absolute; may have unexpected behavior. Due to the nature of position: fixed; this is probably not a major issue, since nesting such elements is not common.
Recommendations:
While the use of the touchstart event will filter out most desktop environments, you will probably want to use user-agent sniffing so that this code will only run for the broken iOS 8, and not other devices such as Android and older iOS versions. Unfortunately, we don't yet know when Apple will fix this issue in iOS, but I would be surprised if it is not fixed in the next major version.
I found a method that works without the need to change to position absolute!
Full uncommented code
var scrollPos = $(document).scrollTop();
$(window).scroll(function(){
scrollPos = $(document).scrollTop();
});
var savedScrollPos = scrollPos;
function is_iOS() {
var iDevices = [
'iPad Simulator',
'iPhone Simulator',
'iPod Simulator',
'iPad',
'iPhone',
'iPod'
];
while (iDevices.length) {
if (navigator.platform === iDevices.pop()){ return true; }
}
return false;
}
$('input[type=text]').on('touchstart', function(){
if (is_iOS()){
savedScrollPos = scrollPos;
$('body').css({
position: 'relative',
top: -scrollPos
});
$('html').css('overflow','hidden');
}
})
.blur(function(){
if (is_iOS()){
$('body, html').removeAttr('style');
$(document).scrollTop(savedScrollPos);
}
});
Breaking it down
First you need to have the fixed input field toward the top of the page in the HTML (it's a fixed element so it should semantically make sense to have it near the top anyway):
<!DOCTYPE HTML>
<html>
<head>
<title>Untitled</title>
</head>
<body>
<form class="fixed-element">
<input class="thing-causing-the-issue" type="text" />
</form>
<div class="everything-else">(content)</div>
</body>
</html>
Then you need to save the current scroll position into global variables:
//Always know the current scroll position
var scrollPos = $(document).scrollTop();
$(window).scroll(function(){
scrollPos = $(document).scrollTop();
});
//need to be able to save current scroll pos while keeping actual scroll pos up to date
var savedScrollPos = scrollPos;
Then you need a way to detect iOS devices so it doesn't affect things that don't need the fix (function taken from https://stackoverflow.com/a/9039885/1611058)
//function for testing if it is an iOS device
function is_iOS() {
var iDevices = [
'iPad Simulator',
'iPhone Simulator',
'iPod Simulator',
'iPad',
'iPhone',
'iPod'
];
while (iDevices.length) {
if (navigator.platform === iDevices.pop()){ return true; }
}
return false;
}
Now that we have everything we need, here is the fix :)
//when user touches the input
$('input[type=text]').on('touchstart', function(){
//only fire code if it's an iOS device
if (is_iOS()){
//set savedScrollPos to the current scroll position
savedScrollPos = scrollPos;
//shift the body up a number of pixels equal to the current scroll position
$('body').css({
position: 'relative',
top: -scrollPos
});
//Hide all content outside of the top of the visible area
//this essentially chops off the body at the position you are scrolled to so the browser can't scroll up any higher
$('html').css('overflow','hidden');
}
})
//when the user is done and removes focus from the input field
.blur(function(){
//checks if it is an iOS device
if (is_iOS()){
//Removes the custom styling from the body and html attribute
$('body, html').removeAttr('style');
//instantly scrolls the page back down to where you were when you clicked on input field
$(document).scrollTop(savedScrollPos);
}
});
I was able to fix this for select inputs by adding an event listener to the necessary select elements, then scrolling by an offset of one pixel when the select in question gains focus.
This isn't necessarily a good solution, but it's much simpler and more reliable than the other answers I've seen here. The browser seems to re-render/re-calculate the position: fixed; attribute based on the offset supplied in the window.scrollBy() function.
document.querySelector(".someSelect select").on("focus", function() {window.scrollBy(0, 1)});
Much like Mark Ryan Sallee suggested, I found that dynamically changing the height and overflow of my background element is the key - this gives Safari nothing to scroll to.
So after the modal's opening animation finishes, change the background's styling:
$('body > #your-background-element').css({
'overflow': 'hidden',
'height': 0
});
When you close the modal change it back:
$('body > #your-background-element').css({
'overflow': 'auto',
'height': 'auto'
});
While other answers are useful in simpler contexts, my DOM was too complicated (thanks SharePoint) to use the absolute/fixed position swap.
Cleanly? no.
I recently had this problem myself with a fixed search field in a sticky header, the best you can do at the moment is keep the scroll position in a variable at all times and upon selection make the fixed element's position absolute instead of fixed with a top position based on the document's scroll position.
This is however very ugly and still results in some strange back and forth scrolling before landing on the right place, but it is the closest I could get.
Any other solution would involve overriding the default scroll mechanics of the browser.
Haven't dealt with this particular bug, but maybe put an overflow: hidden; on the body when the text area is visible (or just active, depending on your design). This may have the effect of not giving the browser anywhere "down" to scroll to.
A possible solution would be to replace the input field.
Monitor click events on a div
focus a hidden input field to render the keyboard
replicate the content of the hidden input field into the fake input field
function focus() {
$('#hiddeninput').focus();
}
$(document.body).load(focus);
$('.fakeinput').bind("click",function() {
focus();
});
$("#hiddeninput").bind("keyup blur", function (){
$('.fakeinput .placeholder').html(this.value);
});
#hiddeninput {
position:fixed;
top:0;left:-100vw;
opacity:0;
height:0px;
width:0;
}
#hiddeninput:focus{
outline:none;
}
.fakeinput {
width:80vw;
margin:15px auto;
height:38px;
border:1px solid #000;
color:#000;
font-size:18px;
padding:12px 15px 10px;
display:block;
overflow:hidden;
}
.placeholder {
opacity:0.6;
vertical-align:middle;
}
<input type="text" id="hiddeninput"></input>
<div class="fakeinput">
<span class="placeholder">First Name</span>
</div>
codepen
None of these solutions worked for me because my DOM is complicated and I have dynamic infinite scroll pages, so I had to create my own.
Background: I am using a fixed header and an element further down that sticks below it once the user scrolls that far down. This element has a search input field. In addition, I have dynamic pages added during forward and backwards scroll.
Problem: In iOS, anytime the user clicked on the input in the fixed element, the browser would scroll all the way to the top of the page. This not only caused undesired behavior, it also triggered my dynamic page add at the top of the page.
Expected Solution: No scroll in iOS (none at all) when the user clicks on the input in the sticky element.
Solution:
/*Returns a function, that, as long as it continues to be invoked, will not
be triggered. The function will be called after it stops being called for
N milliseconds. If `immediate` is passed, trigger the function on the
leading edge, instead of the trailing.*/
function debounce(func, wait, immediate) {
var timeout;
return function () {
var context = this, args = arguments;
var later = function () {
timeout = null;
if (!immediate) func.apply(context, args);
};
var callNow = immediate && !timeout;
clearTimeout(timeout);
timeout = setTimeout(later, wait);
if (callNow) func.apply(context, args);
};
};
function is_iOS() {
var iDevices = [
'iPad Simulator',
'iPhone Simulator',
'iPod Simulator',
'iPad',
'iPhone',
'iPod'
];
while (iDevices.length) {
if (navigator.platform === iDevices.pop()) { return true; }
}
return false;
}
$(document).on("scrollstop", debounce(function () {
//console.log("Stopped scrolling!");
if (is_iOS()) {
var yScrollPos = $(document).scrollTop();
if (yScrollPos > 200) { //200 here to offset my fixed header (50px) and top banner (150px)
$('#searchBarDiv').css('position', 'absolute');
$('#searchBarDiv').css('top', yScrollPos + 50 + 'px'); //50 for fixed header
}
else {
$('#searchBarDiv').css('position', 'inherit');
}
}
},250,true));
$(document).on("scrollstart", debounce(function () {
//console.log("Started scrolling!");
if (is_iOS()) {
var yScrollPos = $(document).scrollTop();
if (yScrollPos > 200) { //200 here to offset my fixed header (50px) and top banner (150px)
$('#searchBarDiv').css('position', 'fixed');
$('#searchBarDiv').css('width', '100%');
$('#searchBarDiv').css('top', '50px'); //50 for fixed header
}
}
},250,true));
Requirements: JQuery mobile is required for the startsroll and stopscroll functions to work.
Debounce is included to smooth out any lag created by the sticky element.
Tested in iOS10.
I just jumped over something like this yesterday by setting height of #a to max visible height (body height was in my case) when #b is visible
ex:
<script>
document.querySelector('#b').addEventListener('focus', function () {
document.querySelector('#a').style.height = document.body.clientHeight;
})
</script>
ps: sorry for late example, just noticed it was needed.
This is now fixed in iOS 10.3!
Hacks should no longer be needed.
I had the issue, below lines of code resolved it for me -
html{
overflow: scroll;
-webkit-overflow-scrolling: touch;
}
I have a fixed row of indicators (slider-indicators) that when it reaches the bottom bound, it should sit on top of the footer. On the desktop everything works fine, and I know that on iOS the scrolling freezes the DOM manipulation.
So I tried using on('touchmove') event, which does a decent job, but when the user scrolls up the page on iOS, moving the website itself up (and revealing the blank/grey/ background), the fixed element moves with it also.
I'm try to disable this feature, and usually works with removing the touch event off('touch'), but how would I rebind it again, so that the DOM manipulation works as the user scrolls?
This is what code I have:
$(window).on('touchmove',moveIndicators);
$(window).scroll(moveIndicators);
function moveIndicators() {
var d = $(document).height(),
w = $(window).height(),
s = $(this).scrollTop(),
bottomBound = (navigator.userAgent.match(/(iPhone);.*CPU.*OS 7_\d/i)) ? 119 : 50;
$location = $('.location-nav');
if(d - (w + s) <= bottomBound) {
$location.css({ bottom: bottomBound - (d - (w + s)), 'margin-bottom': '0px' });
} else {
$location.css({ bottom: 0, 'margin-bottom': '0px' });
}
}
I've create an affect that runs when a row of icons are visible on screen.
The animation is essentially changing the padding of a div, giving the effect of a pulse from the icons.
It works perfectly in every browser except Chrome (surprisingly!). Chrome for some reason wobbles the text under each icon while it animates. I used padding in the hopes that it would only affect the content within the div (using the box-sizing: border-box model).
I did write a fix for it which works in Chrome but then breaks the layout in Safari.
So I'm not sure if I can fix the wobble in Chrome or if I can alter my fix to help Safari out.
Here's the link to the page as it is at the moment, without the jQuery fix. It's in the JS file but commented out.
Here's the code that runs the animation, the fix is in here, just commented out:
$('.wrapper').scroll(function(e) {
var tTop = target.offset().top;
var tTopOffset = tTop+target.height();
if( tTop < height ) {
if (flag) {
targetDiv.animate({
opacity: 1
}, 500);
targetDiv.each(function(i){
// FIX breaks on safari, but fixes issue in Chrome...
// targetDiv.css('height', targetDivHeight);
$(this).delay((i++) * 900).animate({
padding: '0em'
}, 400);
$(this).animate({
padding: '0.5em'
}, 400);
});
flag = false
}
} else {
targetDiv.css('opacity', '0');
flag = true;
}
});
I think it is because you didn't specified the width and height of the element you are trying to animate. border-box doesn't just ignore padding value, it needs width and height value that includes padding and border. Using transform:scale could be nice either as commented above, but IMHO it is a bit tricky to achieve with .animate() and has less browser support.
Try this in console and try modify your code. I tried and it works well in the latest Safari and Chrome. (should use .outerHeight() to get correct value, since you use padding value to animate)
$ = jQuery;
var targetDiv = $('.icon-img-div');
var targetDivHeight = $('.icon-img-div').outerHeight();
var targetDivWidth = $('.icon-img-div').outerWidth();
targetDiv.each(function (i) {
// this breaks on safari, but fixes issue in Chrome...
targetDiv.css({
height: targetDivHeight,
width: targetDivWidth
});
$(this).delay((i++) * 900).animate({
padding: '0em'
}, 400);
$(this).animate({
padding: '0.5em'
}, 400);
});
So I have a toolbar that is on the left side of my page that I have animating when the user scrolls to stay focused on the top of the page. It works perfectly in every browser except IE. In IE, it appears to almost do it twice. It bounces around and is very strange. This is my code.
$(window).scroll(function () {
var windowScrollPosition = $(window).scrollTop(),
toolbarLocation = toolbar.offset().top + toolbar.height(),
canvasSize = formCanvas.offset().top + formCanvas.height();
//Give toolbar a new position relative to container
if ((toolbarLocation + windowScrollPosition) < canvasSize + toolbarLocation) {
toolbar.animate({'margin-top': (windowScrollPosition - 95) <= 0 ? windowScrollPosition : (windowScrollPosition - 95) + 'px'}, 65);
}
});
any thoughts on how to fix this in IE? Thanks!
Unless you want it to animate, i would use position: fixed to keep it there instead of animating it. That would probably fix your problem at least.
I'm looking for a solution to keep an element in view, while scrolling the rest of the page.
I don't want to re-invent the wheel so i'm reaching out to see if the community knows of a canned solution already.
I want to apply this to a huge table that I have, and I would like users to be able to continue seeing the table headers as they scroll down.
Just to clarify, what I'm looking for is different from a scrollable table with overflow CSS settings. The reason I can't use a scrollable table is because that method becomes very slow with thousands of rows. Also that method does not work well on the iPhone browser.
Ideally I would like it so that when the user scrolls the page down the table's header would 'stick' at the top edge of the browser's view. Inversely if the user scrolls back up it would continue to stick there until it arrives back at the original position the header started from.
Are you looking for the #element { position: fixed; ... }? You can switch between fixed, relative and absolute using JS.
http://www.w3schools.com/cssref/pr_class_position.asp
Edit
Take a look at how they do it on [I hope they don't mind] http://www.zocdoc.com/search.aspx?dr_specialty=98&address=Enter+a+City+and+State%2C+or+Zip&insurance_carrier=-1&insurance_plan=-1&button.x=166&button.y=21
They use jQuery, it doesn't seem complicated and they also has an IE6 workaround
$(function() {
var msie6 = $.browser.msie && $.browser.version < 7;
if (!msie6) {
var top = $('#scroll_header').offset().top
- parseFloat($('#scroll_header').css('margin-top').replace(
/auto/, 0));
$(window).scroll(function(event) {
var y = $(this).scrollTop();
if (y >= top) {
$('#scroll_header').addClass('fixed');
} else {
$('#scroll_header').removeClass('fixed');
}
});
var y = $(this).scrollTop();
if (y >= top) {
$('#scroll_header').addClass('fixed');
} else {
$('#scroll_header').removeClass('fixed');
}
} else {
setInterval("checkScroll()", 100);
}
});
function checkScroll() {
ie6top = $('#scroll_header_wrapper').offset().top;
if ($(document).scrollTop() > ie6top) {
$('#scroll_header').css("top", $(document).scrollTop() - ie6top + "px");
$('#scroll_header').css("visibility", "visible");
} else {
$('#scroll_header').css("visibility", "hidden");
}
}