When I click the keyboard and it opens op, the keyboard first finishes the animation. Then the view is resized. This causes for lag when the view scrolls to the field.
I have tried fixing it this way:
this.keyboard.onKeyboardWillShow().then(() => {
this.content.scrollToBottom();
});
But because the view is not yet resized, it does not scroll. How can I fix this? The app doesn't feel native at all without this.
The solution I found for this is as follows.
I created a wrapper within my <ion-content>:
<ion-content>
<div id="wrapper"></div>
</ion-content>
And styled it this way:
#wrapper{
height: 100%;
margin-bottom: 200px; /* it is best to get the keyboard height here from `onKeyboardWillShow()` */
}
Then in ts I did this:
this.keyboard.setResizeMode(KeyboardResizeMode.None);
this.keyboard.onKeyboardWillShow().subscribe(() => {
this.content.scrollToBottom();
});
this.keyboard.onKeyboardWillHide().subscribe(() => {
this.content.scrollToTop(500);
});
Works just like I want it. But I am still open to better answers.
There is a link in the input form to a popup window to pickup subject categories. The popup window (modal) is a long list but it is not scrolling. If I am trying to scroll then the input form is scrolling and not the popup window. The popup window is moving up with the input form. I want the popup window to scroll, so that I can go through the list of 'subject categories' to select. I am trying to modified this open source software code for my local use.
function(resultingHtml){
//retrieve the dialog box
var $Result = $('<div></div>').html(resultingHtml);
var mainDialogDivision = $Result.find('div[id^=aspect_submission_ControlledVocabularyTransformer_div_vocabulary_dialog_]');
$('body').append($(mainDialogDivision[0]));
var vocabularyDialog = $('div#aspect_submission_ControlledVocabularyTransformer_div_vocabulary_dialog_' + vocabularyIdentifier);
vocabularyDialog.dialog({
autoOpen: true,
overflow: scroll,
height: 450,
width: 650,
modal: true,
title: $Result.find('title').html()
});
You should be able to accomplish this using CSS. Adding style overflow:auto to the main modal element should allow you to scroll through all the subject categories.
You don't mention which DSpace theme you are using, so I assume you are using theme Mirage (the default DSpace theme), then adding the following CSS to the style.css file of your theme should solve your scrolling problem:
.ui-dialog.ui-widget.ui-widget-content
{
overflow: auto
}
I have created a portfolio-type (WordPress-based) website, using FullPage and Flexslider (as a absolute positioned pop-up), and it has a FullScreen button, which is currently giving me some nightmares, but only on the second ".section" in of the FullPage (it only has two sections).
I am also using SlimScroll.js as advised on the FullPage documentation as it can be taller than the window.
For Chrome the animation is "clunky", and when it goes fullscreen it waits like a second until it actually does. Please see the image below:
Screenshot of transition happening
I have added the following code and it worked for the first section, but not to the second section...:
html:not(.ios) .fp-section.active {
height: 100vh !important;
}
html:not(.ios) .fp-section.active .fp-tableCell {
height: 100vh !important;
}
On Safari, though, the transition is smooth but, every now and then, when it finishes it flickers...!
On Firefox there's not much problem as the fullscreen fades in and out. (Is there a way to replace it for a zoom-type animation?
My FullPage settings:
$('#fullpage').fullpage({
// Navigation
slideNavigation: false,
// Scrolling
easingcss3: 'cubic-bezier(0.850, 0.000, 0.250, 1.000)', //easeInOutCirc
scrollingSpeed: 500,
scrollOverflow: true,
// Design
controlArrows: false,
// Events
afterLoad: function(anchorLink, index) { // after changing section
if (index == 1){
// Load scrollDown link so that you don't have to load it afterwards
$('#main').load(scrollDown + ' .main-content', function(){
$.fn.fullpage.reBuild();
});
// Hide menu
if ( $( '#site-navigation' ).hasClass( 'toggled' ) ) {
$( '#site-navigation' ).removeClass('toggled');
$( '#site-navigation .menu-toggle').attr( 'aria-expanded', 'false' );
$( '#site-navigation ul').attr( 'aria-expanded', 'false' );
}
}
colorInversion();
popupSlider();
},
afterRender: function() { // so that it applies to first section too
colorInversion();
popupSlider();
},
afterSlideLoad: function( anchorLink, index, slideAnchor, slideIndex) { // after changing slide
//$.fn.fullpage.reBuild();
popupSlider();
}
});
My FlexSlider settings:
$('#popup-slider').flexslider({
animation: 'slide',
slideshow: false,
easing: 'easeInOutExpo',
animationSpeed: 0,
customDirectionNav: $(".flex-direction-nav a"),
// Usability features
video: true,
// Special Properties
manualControls: '.popup-slider-link',
// Callback API
start: function(slider){
$('.slides li *').click(function(event){
event.preventDefault();
slider.flexAnimate(slider.getTarget("next"));
});
},
after: function(){ // After each slider animation completes
flexslideColorInversion(); // Check for color inversion
$('#popup-slider').data('flexslider').vars.animationSpeed = 500; // Put animation speed back to 500
},
});
(Flexslider is initialised inside the popupslider() function.)
Is there a way to "fix" these issues?
Thank you so much in advance to anyone who may be able to help me with this.
EDIT:
I have seen that the lag in Chrome was because the popup was over the thumbnails and therefore was still resizing them even though they weren't in view; my solution to this was to apply a "display: none" to when the popup slider was on.
The Flicker in Safari is because FullPage.js changes the sections' sizes and their "translate3d", so there is a flicker when that adjustment occurs. The default Fullpage.js characteristic is to actually show part of the section above while it's adjusting, but as I am using 100vh for the .active section it doesnt show on Chrome, Opera or Firefox and only flickers in Safari (hence me wondering what the flicker was!)
Probably the only way around it is to recode Fullpage.js's translate3d (and height/width) codes also with "vh" so that it doesn't have to adjust the size. If any one has a ready code of this, that would be really appreciated! (IE8 is support is not required).
Cheers
When I click on a button, a Flyout will appear for confirmation on the top of the button I have just clicked on.
I tried this :
flyout.alignment="center"
but the alignment is by the button. I want to show my flyout in the center of my screen. I'm asking if this is possible with Winjs.UI.Flyout
Flyout is always aligned wrt to the element passed as the first parameter. If you need to have the flyout not aligned to the element but at the center of the screen, it can be done by placing an hidden element at the center of the screen and aligning the flyout to it.
_oncmdclick: function oncmdclick(event)
{
// assume an element with class hidden in the page and placed at center of the screen
var hiddenElement = this.element.querySelector('.hidden');
var myFlyoutElement = ...; // myFlyoutElement is the flyout element
this.newItemFlyoutElement.winControl.show(hiddenElement, 'top', 'center');
},
html:
<div class="hidden" style="visibility: collapse"></div>
css:
// in this case, I had used 1x1 -ms-grid for the section of the page
.mypage.fragment section[role=main] {
display: -ms-grid;
-ms-grid-rows: 1fr;
-ms-grid-columns: 1fr;
}
// center the hidden element in the page grid
.mypage.fragment section[role=main] .hidden
{
-ms-grid-column-align: center;
-ms-grid-row-align: center;
}
I have been struggling with fixed positioning in iPad for a while. I know iScroll and it does not always seem to work (even in their demo). I also know that Sencha has a fix for that, but I couldn't Ctrl + F the source code for that fix.
I am hoping that someone may have the solution. The problem is that fixed positioned elements do not get updated when the user pans down/up on an iOS powered mobile Safari.
A lot of mobile browsers deliberately do not support position:fixed; on the grounds that fixed elements could get in the way on a small screen.
The Quirksmode.org site has a very good blog post that explains the problem: http://www.quirksmode.org/blog/archives/2010/12/the_fifth_posit.html
Also see this page for a compatibility chart showing which mobile browsers support position:fixed;: http://www.quirksmode.org/m/css.html
(but note that the mobile browser world is moving very quickly, so tables like this may not stay up-to-date for long!)
Update:
iOS 5 and Android 4 are both reported to have position:fixed support now.
I tested iOS 5 myself in an Apple store today and can confirm that it does work with position fixed. There are issues with zooming in and panning around a fixed element though.
I found this compatibility table far more up to date and useful than the quirksmode one:
http://caniuse.com/#search=fixed
It has up to date info on Android, Opera (mini and mobile) & iOS.
Fixed positioning doesn't work on iOS like it does on computers.
Imagine you have a sheet of paper (the webpage) under a magnifying glass(the viewport), if you move the magnifying glass and your eye, you see a different part of the page. This is how iOS works.
Now there is a sheet of clear plastic with a word on it, this sheet of plastic stays stationary no matter what (the position:fixed elements). So when you move the magnifying glass the fixed element appears to move.
Alternatively, instead of moving the magnifying glass, you move the paper (the webpage), keeping the sheet of plastic and magnifying glass still. In this case the word on the sheet of plastic will appear to stay fixed, and the rest of the content will appear to move (because it actually is) This is a traditional desktop browser.
So in iOS the viewport moves, in a traditional browser the webpage moves. In both cases the fixed elements stay still in reality; although on iOS the fixed elements appear to move.
The way to get around this, is to follow the last few paragraphs in this article
(basically disable scrolling altogether, have the content in a separate scrollable div (see the blue box at the top of the linked article), and the fixed element positioned absolutely)
"position:fixed" now works as you'd expect in iOS5.
position: fixed does work on android/iphone for vertical scrolling. But you need to make sure your meta tags are fully set. e.g
<meta name="viewport" content="width=device-width, height=device-height, initial-scale=1.0, user-scalable=0, minimum-scale=1.0, maximum-scale=1.0">
Also if you're planning on having the same page work on android pre 4.0, you need to set the top position also, or a small margin will be added for some reason.
I had this problem on Safari (iOS 10.3.3) - the browser was not redrawing until the touchend event fired. Fixed elements did not appear or were cut off.
The trick for me was adding transform: translate3d(0,0,0); to my fixed position element.
.fixed-position-on-mobile {
position: fixed;
transform: translate3d(0,0,0);
}
EDIT - I now know why the transform fixes the issue: hardware-acceleration. Adding the 3D transformation triggers the GPU acceleration making for a smooth transition. For more on hardware-acceleration checkout this article: http://blog.teamtreehouse.com/increase-your-sites-performance-with-hardware-accelerated-css.
now apple support that
overflow:hidden;
-webkit-overflow-scrolling:touch;
Fixed Footer (here with jQuery):
if (navigator.platform == 'iPad' || navigator.platform == 'iPhone' || navigator.platform == 'iPod' || navigator.platform == 'Linux armv6l') {
window.ontouchstart = function() {
$("#fixedDiv").css("display", "none");
}
window.onscroll = function() {
// 45 is the height of the Footer
var iPadPosition = window.innerHeight + window.pageYOffset-45;
$("#fixedDiv").css("position", "absolute");
$("#fixedDiv").css("top", iPadPosition);
$("#fixedDiv").css("display", "block");
}
}
In the CSS file should stand:
#fixedDiv {
position: fixed;
bottom: 0;
height: 45px;
...
}
Avoid on the same box using transform:--- and position:fixed. Element will stay in position:static if there is any transform.
I ended up using the new jQuery Mobile v1.1: http://jquerymobile.com/blog/2012/04/13/announcing-jquery-mobile-1-1-0/
We now have a solid re-write that provides true fixed toolbars on the
a lot of popular platforms and safely falls back to static toolbar
positioning in other browsers.
The coolest part about this approach is that, unlike JS-based
solutions that impose the unnatural scrolling physics across all
platforms, our scrolling feels 100% native because it is. This means
that scrolling feels right everywhere and works with touch, mousewheel
and keyboard user input. As a bonus, our CSS-based solution is super
lightweight and doesn’t impact compatibility or accessibility.
using jquery i am able to come up with this. it doesnt scroll smooth, but it does the trick. you can scroll down, and the fixed div pops up on top.
THE CSS
<style type="text/css">
.btn_cardDetailsPg {height:5px !important;margin-top:-20px;}
html, body {overflow-x:hidden;overflow-y:auto;}
#lockDiv {
background-color: #fff;
color: #000;
float:left;
-moz-box-shadow: 0px 4px 2px 2px #ccc;-webkit-box-shadow: 0px 4px 2px 2px #ccc;box-shadow:0px 4px 2px 2px #ccc;
}
#lockDiv.stick {
position: fixed;
top: 0;
z-index: 10000;
margin-left:0px;
}
</style>
THE HTML
<div id="lockSticky"></div>
<div id="lockDiv">fooo</div>
THE jQUERY
<script type="text/javascript">
function sticky_relocate() {
var window_top = $(window).scrollTop();
var div_top = $('#lockSticky').offset().top;
if (window_top > div_top)
$('#lockDiv').addClass('stick')
else
$('#lockDiv').removeClass('stick');
}
$(function() {
$(window).scroll(sticky_relocate);
sticky_relocate();
});
</script>
Finally we want to determine if the ipod touch in landscape or portrait mode to display accordingly
<script type="text/javascript">
if (navigator.userAgent.match(/like Mac OS X/i)) {
window.onscroll = function() {
if (window.innerWidth > window.innerHeight) {
//alert("landscape [ ]");
document.getElementById('lockDiv').style.top =
(window.pageYOffset + window.innerHeight - 268) + 'px';
}
if (window.innerHeight > window.innerWidth) {
//alert("portrait ||");
document.getElementById('lockDiv').style.top =
(window.pageYOffset + window.innerHeight - 418) + 'px';
}
};
}
</script>
The simple way to fix this problem just types transform property for your element. and it will be fixed.
.classname{
position: fixed;
transform: translate3d(0,0,0);
}
Also you can try his way as well this is also work fine.
.classname {
position: -webkit-sticky;
}
Even though the CSS attribute {position:fixed;} seems (mostly) working on newer iOS devices, it is possible to have the device quirk and fallback to {position:relative;} on occasion and without cause or reason. Usually clearing the cache will help, until something happens and the quirk happens again.
Specifically, from Apple itself Preparing Your Web Content for iPad:
Safari on iPad and Safari on iPhone do not have resizable windows. In
Safari on iPhone and iPad, the window size is set to the size of the
screen (minus Safari user interface controls), and cannot be changed
by the user. To move around a webpage, the user changes the zoom level
and position of the viewport as they double tap or pinch to zoom in or
out, or by touching and dragging to pan the page. As a user changes
the zoom level and position of the viewport they are doing so within a
viewable content area of fixed size (that is, the window). This means
that webpage elements that have their position "fixed" to the viewport
can end up outside the viewable content area, offscreen.
What is ironic, Android devices do not seem to have this issue. Also it is entirely possible to use {position:absolute;} when in reference to the body tag and not have any issues.
I found the root cause of this quirk; that it is the scroll event not playing nice when used in conjunction with the HTML or BODY tag. Sometimes it does not like to fire the event, or you will have to wait until the scroll swing event is finished to receive the event. Specifically, the viewport is re-drawn at the end of this event and fixed elements can be re-positioned somewhere else in the viewport.
So this is what I do: (avoid using the viewport, and stick with the DOM!)
<html>
<style>
.fixed{
position:fixed;
/*you can set your other static attributes here too*/
/*like height and width, margin, etc.*/
}
.scrollableDiv{
position:relative;
overflow-y:scroll;
/*all children will scroll within this like the body normally would.*/
}
.viewportSizedBody{
position:relative;
overflow:hidden;
/*this will prevent the body page itself from scrolling.*/
}
</style>
<body class="viewportSizedBody">
<div id="myFixedContainer" class="fixed">
This part is fixed.
</div>
<div id="myScrollableBody" class="scrollableDiv">
This part is scrollable.
</div>
</body>
<script type="text/javascript" src="{your path to jquery}/jquery-1.7.2.min.js"></script>
<script>
var theViewportHeight=$(window).height();
$('.viewportSizedBody').css('height',theViewportHeight);
$('#myScrollableBody').css('height',theViewportHeight);
</script>
</html>
In essence this will cause the BODY to be the size of the viewport and non-scrollable. The scrollable DIV nested inside will scroll as the BODY normally would (minus the swing effect, so the scrolling does stop on touchend.) The fixed DIV stays fixed without interference.
As a side note, a high z-index value on the fixed DIV is important to keep the scrollable DIV appear to be behind it. I normally add in window resize and scroll events also for cross-browser and alternate screen resolution compatibility.
If all else fails, the above code will also work with both the fixed and scrollable DIVs set to {position:absolute;}.
In my case, it was because the fixed element was being shown by using an animation. As stated in this link:
in Safari 9.1, having a position:fixed-element inside an animated element, may cause the position:fixed-element to not appear.
Had the same issue on Iphone X. To fixed it I just add height to the container
top: 0;
height: 200px;
position: fixed;
I just added top:0 because i need my div to stay at top
This might not be applicable to all scenarios, but I found that the position: sticky (same thing with position: fixed) only works on old iPhones when the scrolling container is not the body, but inside something else.
Example pseudo html:
body <- scrollbar
relative div
sticky div
The sticky div will be sticky on desktop browsers, but with certain devices, tested with: Chromium: dev tools: device emultation: iPhone 6/7/8, and with Android 4 Firefox, it will not.
What will work, however, is
body
div overflow=auto <- scrollbar
relative div
sticky div
This seems to work for Ionic5 on iPhone 6 Plus on iOS 12.4.2
.large_player {
float: left;
bottom: 0;
width: 100%;
position: fixed;
background-color: white;
border-top: black 1px solid;
height: 14rem;
z-index: 100;
transform: translate3d(0,0,0);
}
The transform tag makes it work, but it also seems a little clunky in how the scroll works, it is seems to redraw the 'on top' element after it's all moved and sort of resets and makes it jump a little.
Or, you could also use this tag option as well, position: -webkit-sticky;, but then you won't get, or may run in to trouble with WPA/browser or Android builds while having to do version checking and have multiple CSS tags.
.large_player {
float: left;
bottom: 0;
width: 100%;
position: -webkit-sticky;
background-color: white;
border-top: black 1px solid;
height: 14rem;
z-index: 100;
}
I don't know at what point it was fixed, but later iOS phones work without the transform tag. I don't know if it's the iOS version, or the phone.
As most iOS devices are usually on the most recent iOS version, it's pretty safe with go with a weird work around - such as using the transform tag, rather than building in a quirky detection routine for the sake of less than 1% of users.
Update:
After thinking about this answer further, this is just another way of doing this by platform for ionic5+:
.TS
import {Platform } from '#ionic/angular';
constructor(public platform: Platform) {
// This next bit is so that the CSS is shown correctly for each platform
platform.ready().then(() => {
if (this.platform.is('android')) {
console.log("running on Android device!");
this.css_iOS = false;
}
if (this.platform.is('ios')) {
console.log("running on iOS device!");
this.css_iOS = true;
}
if (this.platform.is('ipad')) {
console.log("running on iOS device!");
this.css_iOS = true;
}
});
}
css_iOS: boolean = false;
.HTML
<style *ngIf="css_iOS">
.small_player {
position: -webkit-sticky !important;
}
.large_player {
position: -webkit-sticky !important;
}
</style>
<style>
.small_player {
float: left;
bottom: 0;
width: 100%;
position: fixed;
background-color: white;
border-top: black 1px solid;
height: 4rem;
z-index: 100;
/*transform: translate3d(0,0,0);*/
}
.large_player {
float: left;
bottom: 0;
width: 100%;
position: fixed;
background-color: white;
border-top: black 1px solid;
height: 14rem;
z-index: 100;
/*transform: translate3d(0,0,0);*/
}
</style>