I could detect scroll reaches to bottom by using Javascript
$(window).on("scroll", function() {
var scrollHeight = $(document).height();
var scrollPosition = $(window).height() + $(window).scrollTop();
if ((scrollHeight - scrollPosition) / scrollHeight === 0) {
// when scroll to bottom of the page
}
});
But I cannot find document.height in Dart.
How can I get height of document and compare with window.scrollY?
I think, although I always had trouble understanding the various heights, that document.body.clientHeight should work (i.e. I have used it once)
_updateScrollInfo([_]) {
if (window.innerHeight + window.scrollY >= document.body.clientHeight) {
print("at bottom");
}
}
window.onScroll.listen(_updateScrollInfo);
DartPad example: https://dartpad.dartlang.org/6fcfb715e4090a1aafe4
I am making an iOS app, one page of my app has a webview and multiple views follows. In this page, the webview should auto expand and the height should fit with the content injected dynamically, because i do not want the webview has scroll. Now, i have a problem, i can't post the exact height of doucment.body to the client to set webview's height, because i can't confirm when the whole content has been render into the document.
i have tried to check the height change of document.body，till the height is not changed, i post '0'. The client get the signal i post through invokeNative('changeHeight', params)，when it is 0, the client get the document.body height, but in my test, that is not the exact height of the document. Just part of the content shows.
function reportHeight() {
var preH = document.body.offsetHeight;
var params = {
"heigh": preH
};
invokeNative('changeHeight', params); //the method i communicate with client
var timeId = setInterval(function() {
var height = document.body.offsetHeight;
if((height - preH) == 0) {
invokeNative('changeHeight', {"heigh": 0});
clearInterval(timeId);
setTimeout(function() {
invokeNative('changeHeight', {"heigh": 10});
}, 500)
return false;
}
var params = {
"heigh": (height - preH)
};
preH = height;
invokeNative('changeHeight', params);
}, 30);
}
is there any way to fix this problem?
By the way, the content injected into the page only has css and html tags, and there is no js.
I have pieced together information on eliminating iframe scrollbars in favour of the browser scroll bars when rendering a reportviewer in an iframe. MVC does not support rendering a report viewer in a view, hence the need for an iframe.
Edit: i struggled to find this solution (below) hence i thought i would share.
In the aspx page (the page that will be rendered in the iframe)
$(function () {//jQuery document.ready
// attach an event handler, whenever a 'property' of the reportviewer changes, the function will be called to adjust the height of the iframe
Sys.Application.add_load(function () {
$find("ReportViewer").add_propertyChanged(viewerPropertyChanged); // $.find("ReportViewer") will return the reportviewer with id "ReportViewer"
});
function adjustIframeSize() {
// you can play around with these figures until your report is perfect
var extraHeightToAvoidCuttingOffPartOfReport = 100;
var extraWidthToAvoidCuttingOffPartOfReport = 10;
// '#ReportViewer_fixedTable' is a portion of the report viewer that contains the actual report, minus the parameters etc
var reportPage = $('#ReportViewer_fixedTable');
// get the height of the report. '#ParametersRowReportViewer' is that top part that contains parameters etc
var newHeight = reportPage.height() + $('#ParametersRowReportViewer').height() + extraHeightToAvoidCuttingOffPartOfReport;
// same for width
var newWidth = reportPage.width() + extraWidthToAvoidCuttingOffPartOfReport;
// get iframe from parent document, the rest of this function only works if both the iframe and the parent page are on the same domain
var reportIframe = $('#ReportViewerFrame', parent.document);
// just make sure that nothing went wrong with the calculations, other wise the entire report could be given a very small value for height and width, thereby hiding the report
if(newHeight>extraHeightToAvoidCuttingOffPartOfReport)
reportIframe.height(newHeight);
if (newWidth > extraWidthToAvoidCuttingOffPartOfReport)
reportIframe.width(newWidth);
}
function viewerPropertyChanged(sender, e) {
// only change the iframe dimensions when 'isLoading'
if (e.get_propertyName() == "isLoading") {
if (!$find("ReportViewer").get_isLoading()) {
adjustIframeSize();
}
}
};
});
Solved a similar problem using a set of extensions in ReportViewer for MVC.
#Html.ReportViewer(
ViewBag.ReportViewer as Microsoft.Reporting.WebForms.ReportViewer,
new { scrolling = "no" })
I understand that mobile safari has a lot of bugs around fixed elements, but for the most part I've managed to get my layout working correctly until I added a much needed text input to the fixed navigation at the bottom. Now when the user focuses on the text input element and the virtual keyboard appears, my navigation, which is otherwise always fixed at the bottom of the page, jumps up to a really strange spot in the middle of the page.
I'd add some of my code to this post, but I wouldn't be sure where to start. That navigation is fixed at the bottom and positioned to the left and bottom 0, and 100% width. From there, I don't know what's going on, I can only assume it's a mobile safari bug.
It also appears to lose it's position fixed and become relative, only while the text input element is focused on and the virtual keyboard is open.
http://dansajin.com/2012/12/07/fix-position-fixed/ this is one of the solutions proposed. Seems worth a shot.
In short: set fixed elements to position:absolute when any input is focused and reset them when that element is blurred
.header {
position: fixed;
}
.footer {
position: fixed;
}
.fixfixed .header,
.fixfixed .footer {
position: absolute;
}
and
if ('ontouchstart' in window) {
/* cache dom references */
var $body = $('body');
/* bind events */
$(document)
.on('focus', 'input', function() {
$body.addClass('fixfixed');
})
.on('blur', 'input', function() {
$body.removeClass('fixfixed');
});
}
The solutions on the top are some ways to go and fix the problem, but I think adding extra css class or using moderniz we are complicating things.If you want a more simple solution, here is a non-modernizr non-extra-css but pure jquery solution and work on every device and browsers I use this fix on all my projects
if ('ontouchstart' in window) {
$(document).on('focus', 'textarea,input,select', function() {
$('.navbar.navbar-fixed-top').css('position', 'absolute');
}).on('blur', 'textarea,input,select', function() {
$('.navbar.navbar-fixed-top').css('position', '');
});
}
I had a similar problem, but I found a workaround by adding the following css class to the body element on input focus and then removing it again on unfocus:
.u-oh {
overflow: hidden;
height: 100%;
width: 100%;
position: fixed;
}
Taking from what sylowgreen did, the key is to fix the body on entering the input. Thus:
$("#myInput").on("focus", function () {
$("body").css("position", "fixed");
});
$("#myInput").on("blur", function () {
$("body").css("position", "static");
});
Add javascript like this:
$(function() {
var $body;
if ('ontouchstart' in window) {
$body = $("body");
document.addEventListener('focusin', function() {
return $body.addClass("fixfixed");
});
return document.addEventListener('focusout', function() {
$body.removeClass("fixfixed");
return setTimeout(function() {
return $(window).scrollLeft(0);
}, 20);
});
}
});
and add class like this:
.fixfixed header{
position: absolute;
}
you can reference this article: http://dansajin.com/2012/12/07/fix-position-fixed/
I really like the solution above. I packaged it up into a little jQuery plugin so I could:
Set which parent gets the class
Set which elements this applies to (don't forget "textarea" and "select").
Set what the parent class name is
Allow it to be chained
Allow it to be used multiple times
Code example:
$.fn.mobileFix = function (options) {
var $parent = $(this),
$fixedElements = $(options.fixedElements);
$(document)
.on('focus', options.inputElements, function(e) {
$parent.addClass(options.addClass);
})
.on('blur', options.inputElements, function(e) {
$parent.removeClass(options.addClass);
// Fix for some scenarios where you need to start scrolling
setTimeout(function() {
$(document).scrollTop($(document).scrollTop())
}, 1);
});
return this; // Allowing chaining
};
// Only on touch devices
if (Modernizr.touch) {
$("body").mobileFix({ // Pass parent to apply to
inputElements: "input,textarea,select", // Pass activation child elements
addClass: "fixfixed" // Pass class name
});
}
I use this jQuery script:
var focus = 0;
var yourInput = $(".yourInputClass");
yourInput.focusin(function(){
if(!focus) {
yourInput.blur();
$("html, body").scrollTop($(document).height());
focus = 1;
}
if(focus) {
yourInput.focus();
focus = 0;
}
});
Works perfectly for me.
The focusin and focusout events seem to be better suited to this problem than the focus and blur events since the former bubble up to the root element. See this answer on SO.
Personally I use AngularJS, so I implemented it like this:
$window.document.body.addEventListener('focusin', function(event) {
var element = event.target;
var tagName = element.tagName.toLowerCase();
if(!$rootScope.inputOverlay && (tagName === 'input' || tagName === 'textarea' || tagName === 'select')) {
$rootScope.$apply(function() {
$rootScope.inputOverlay = true;
});
}
});
$window.document.body.addEventListener('focusout', function() {
if($rootScope.inputOverlay) {
$rootScope.$apply(function() {
$rootScope.inputOverlay = false;
});
}
});
Note: I am conditionally running this script if this is mobile Safari.
I put an ng-class attribute on my navbar:
<div class="navbar navbar-default navbar-fixed-top" ng-class="{'navbar-absolute': inputOverlay}">
using the following CSS:
.navbar-absolute {
position: absolute !important;
}
You can read more about focusin here and focusout here.
Test this one. It works. I just test it.
$(document).on('focus','input', function() {
setTimeout(function() {
$('#footer1').css('position', 'absolute');
$('#header1').css('position', 'absolute');
}, 0);
});
$(document).on('blur','input', function() {
setTimeout(function() {
$('#footer1').css('position', 'fixed');
$('#header1').css('position', 'fixed');
}, 800);
});
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 wasn't having any luck with the solution proposed by Dan Sajin. Perhaps the bug has changed since he wrote that blog post, but on iOS 7.1, the bug will always surface when the position is changed back to fixed after the input is blurred, even if you delay until the software keyboard is hidden completely. The solution I came to involves waiting for a touchstart event rather than the blur event since the fixed element always snaps back into proper position when the page is scrolled.
if (Modernizr.touch) {
var $el, focused;
$el = $('body');
focused = false;
$(document).on('focus', 'input, textarea, select', function() {
focused = true;
$el.addClass('u-fixedFix');
}).on('touchstart', 'input, textarea, select', function() {
// always execute this function after the `focus` handler:
setTimeout(function() {
if (focused) {
return $el.removeClass('u-fixedFix');
}
}, 1);
});
}
HTH
I have something similar to this iScroll example: http://cubiq.org/dropbox/iscroll4/examples/simple/
Except that I'm using jQuery mobile (i.e., the header, footer, and content are set using jQuery Mobile). Everything is running smoothly except for scrollToElement.
Is there any way to get scrollToElement working when using jQuery Mobile and iScroll?
Here's the iScroll script I currently have:
var myScroll;
function loaded() {
myScroll = new iScroll('wrapper');
}
document.addEventListener('touchmove', function (e) { e.preventDefault(); }, false);
document.addEventListener('DOMContentLoaded', function () { setTimeout(loaded, 200);}, false);
EDIT: Forgot to mention what I'm trying to achieve. In the iScroll example mentioned above, I'm trying to scroll to a specific row. The only problem is that jQuery Mobile prevents scrollToElement from working for some reason.
Also make sure that you're using a timeout
setTimeout(function () {
myScroll.scrollToElement(".elementClass", "0s");
myScroll.refresh();
}, 0);
The workaround I have found is to capture the elements position and then use scrollToPage():
var w = $("#showselectedauthors").offset().top;
// ...
$.storeScroller.scrollToPage(0, w);
Of course for this to work you have to capture the position when the element is visible or the offset will be meaningless. You can do this when the page is built but before the scroller is initialized.
In my case the element is visible and I capture w at that time. I then refresh some content and refresh the scroller. After I do that I want to make sure the element is still visible.
Case anyone needs to scroll to a jQuery Object here's my code .
Make sure you're calling this method inside a setTimeout and your "iscroll" object is defined .
function scrollToElement($element) {
if ($element.size() > 1) {
throw new Error("Cannot be a node!");
};
var offset = $element.offset().top;
var to = -(offset - iscroll.y);
to = (iscroll.maxScrollY > to) ? iscroll.maxScrollY : to;
iscroll.scrollTo(0, to);
}