jQuery object scrollTop(value) when detached from body? - javascript

I'm doing a DOM manipulation in jQuery, wrapping body in some div elements, so I'm trying to match scroll position from window to div element after this transformations, but somehow it doesn't work.
Here's what I'm doing:
scrollPosition = $(window).scrollTop();
myBody = $("body").detach();
myBody.wrapInner("<div class='someclass'><div class='osm-website'></div></div>");
myWebsite = myBody.find('.osm-website');
myWebsite.scrollTop(scrollPosition);
and myWebsite scrollTop position is still 0
but if I do this:
myBody.appendTo('html');
$('.osm-website').scrollTop(scrollPosition);
it works.
I have to find a way to scroll it before appending it to dom because this scroll after appending to page causes a brief "flash" in Safari on Mac. I need it to be seemless.
Any help is greatly appreciated

If you are really appending the content directly to html you could simply use:
// Source: How to get height of entire document with JavaScript?
// http://stackoverflow.com/a/1147768/887539
var body = document.body;
var html = document.documentElement;
var height = Math.max( body.scrollHeight, body.offsetHeight, html.clientHeight, html.scrollHeight, html.offsetHeight );
$(window).scrollTop(height);
If not you could take your soon to be parent and find the last elements position and add the elements height:
var $parent = $('....');
var $lastChild = $parent.children().last();
var offset = $lastChild.offset();
var scrollPos = offset.top + lastChild.outerHeight(true);
$(window).scrollTop(scrollPos);

Related

Start counter with a little delay [duplicate]

This question already has answers here:
How to check if element is visible after scrolling?
(46 answers)
Closed 5 years ago.
Function to check if the div class "media" is within the browsers visual viewport regardless of the window scroll position.
<HTML>
<HEAD>
<TITLE>My first HTML document</TITLE>
</HEAD>
<BODY>
<div class="main">
<div class="media"></div>
</div>
</BODY>
</HTML>
Trying to use this plugin https://github.com/customd/jquery-visible with this function but
I don't know how to make it work.
$('#element').visible( true );
You can write a jQuery function like this to determine if an element is in the viewport.
Include this somewhere after jQuery is included:
$.fn.isInViewport = function() {
var elementTop = $(this).offset().top;
var elementBottom = elementTop + $(this).outerHeight();
var viewportTop = $(window).scrollTop();
var viewportBottom = viewportTop + $(window).height();
return elementBottom > viewportTop && elementTop < viewportBottom;
};
Sample usage:
$(window).on('resize scroll', function() {
if ($('#Something').isInViewport()) {
// do something
} else {
// do something else
}
});
Note that this only checks the top and bottom positions of elements, it doesn't check if an element is outside of the viewport horizontally.
Check if element is visible in viewport using jquery:
First determine the top and bottom positions of the element. Then determine the position of the viewport's bottom (relative to the top of your page) by adding the scroll position to the viewport height.
If the bottom position of the viewport is greater than the element's top position AND the top position of the viewport is less than the element's bottom position, the element is in the viewport (at least partially). In simpler terms, when any part of the element is between the top and bottom bounds of your viewport, the element is visible on your screen.
Now you can write an if/else statement, where the if statement only runs when the above condition is met.
The code below executes what was explained above:
// this function runs every time you are scrolling
$(window).scroll(function() {
var top_of_element = $("#element").offset().top;
var bottom_of_element = $("#element").offset().top + $("#element").outerHeight();
var bottom_of_screen = $(window).scrollTop() + $(window).innerHeight();
var top_of_screen = $(window).scrollTop();
if ((bottom_of_screen > top_of_element) && (top_of_screen < bottom_of_element)){
// the element is visible, do something
} else {
// the element is not visible, do something else
}
});
This answer is a summary of what Chris Bier and Andy were discussing below. I also used an answer to the following question to formulate my answer: Show Div when scroll position.
According to the documentation for that plugin, .visible() returns a boolean indicating if the element is visible. So you'd use it like this:
if ($('#element').visible(true)) {
// The element is visible, do something
} else {
// The element is NOT visible, do something else
}
You can see this example.
// Is this element visible onscreen?
var visible = $(#element).visible( detectPartial );
detectPartial :
True : the entire element is visible
false : part of the element is visible
visible is boolean variable which indicates if the element is visible or not.
var visible = $(".media").visible();

how to determine whether a particular row is present in the viewport of table body or not [duplicate]

This question already has answers here:
How to check if element is visible after scrolling?
(46 answers)
Closed 5 years ago.
Function to check if the div class "media" is within the browsers visual viewport regardless of the window scroll position.
<HTML>
<HEAD>
<TITLE>My first HTML document</TITLE>
</HEAD>
<BODY>
<div class="main">
<div class="media"></div>
</div>
</BODY>
</HTML>
Trying to use this plugin https://github.com/customd/jquery-visible with this function but
I don't know how to make it work.
$('#element').visible( true );
You can write a jQuery function like this to determine if an element is in the viewport.
Include this somewhere after jQuery is included:
$.fn.isInViewport = function() {
var elementTop = $(this).offset().top;
var elementBottom = elementTop + $(this).outerHeight();
var viewportTop = $(window).scrollTop();
var viewportBottom = viewportTop + $(window).height();
return elementBottom > viewportTop && elementTop < viewportBottom;
};
Sample usage:
$(window).on('resize scroll', function() {
if ($('#Something').isInViewport()) {
// do something
} else {
// do something else
}
});
Note that this only checks the top and bottom positions of elements, it doesn't check if an element is outside of the viewport horizontally.
Check if element is visible in viewport using jquery:
First determine the top and bottom positions of the element. Then determine the position of the viewport's bottom (relative to the top of your page) by adding the scroll position to the viewport height.
If the bottom position of the viewport is greater than the element's top position AND the top position of the viewport is less than the element's bottom position, the element is in the viewport (at least partially). In simpler terms, when any part of the element is between the top and bottom bounds of your viewport, the element is visible on your screen.
Now you can write an if/else statement, where the if statement only runs when the above condition is met.
The code below executes what was explained above:
// this function runs every time you are scrolling
$(window).scroll(function() {
var top_of_element = $("#element").offset().top;
var bottom_of_element = $("#element").offset().top + $("#element").outerHeight();
var bottom_of_screen = $(window).scrollTop() + $(window).innerHeight();
var top_of_screen = $(window).scrollTop();
if ((bottom_of_screen > top_of_element) && (top_of_screen < bottom_of_element)){
// the element is visible, do something
} else {
// the element is not visible, do something else
}
});
This answer is a summary of what Chris Bier and Andy were discussing below. I also used an answer to the following question to formulate my answer: Show Div when scroll position.
According to the documentation for that plugin, .visible() returns a boolean indicating if the element is visible. So you'd use it like this:
if ($('#element').visible(true)) {
// The element is visible, do something
} else {
// The element is NOT visible, do something else
}
You can see this example.
// Is this element visible onscreen?
var visible = $(#element).visible( detectPartial );
detectPartial :
True : the entire element is visible
false : part of the element is visible
visible is boolean variable which indicates if the element is visible or not.
var visible = $(".media").visible();

Jquery horizontal slide based on div width

I have jquery script where you can click a left and right button and it will scroll horizontally to show more content.
The content that needs to be scrolled are in a div with a width of 1296px, but i want to set my jquery code to automatically get the width of the div and when you press on one of the left or right scroll button it will scroll exactly 1296px.
I want to do it this way because I need to later on optimize the design for all screen size and this would be the easier way.
My code:
var $item2 = $('div.group'), //Cache your DOM selector
visible2 = 1, //Set the number of items that will be visible
index2 = 0, //Starting index
endIndex2 = ( $item.length ); //End index
$('#arrowR').click(function(){
index2++;
$item2.animate({'left':'-=1296px'});
});
$('#arrowL').click(function(){
if(index2 > 0){
index2--;
$item2.animate({'left':'+=18.5%'});
}
});
This Javascript should work:
var $item2 = $('div.group'), //Cache your DOM selector
visible2 = 1, //Set the number of items that will be visible
index2 = 0, //Starting index
endIndex2 = ( $item2.length ); //End index
var w = $("#group").width();
$('#arrowR').click(function(){
index2++;
$item2.animate({'left':'-=' + w + 'px'});
});
$('#arrowL').click(function(){
if(index2 > 0){
index2--;
$item2.animate({'left':'+=' + w + 'px'});
}
});
Check this fiddle. Basically we calculate the width initially to not do the same thing repeatedly and the reuse it whenever we need it.
Why not get the width of the visible container first, and then use that value later? Quick example:
var width = $('container').width();
And then during animations:
var left = $item2.css('left') + width;
$item.animate({'left',left});
As a note, innerWidth and outerWidth may be more beneficial than just width depending on how you've set everything up, so if values aren't quite right take a look at those documents.
I've created a fiddle that I think solves your problem:
http://jsfiddle.net/77bvnw3n/
What I did was to create another variable (called width) which on page load, dynamically gets the width of the container.
var width = $('.group-container').width(); //Container Width
This variable is also reset whenever the Next or Previous buttons are pressed (in case the window has been resized since the page loaded).
$('#arrowR').click(function(){
index2++;
//recheck container width
width = $('.group-container').width();
$item2.animate({'left':'-=' + width + 'px'});
});
Take a look and let me know if it helps.
Note: I replaced the 'Next' and 'Previous' images with coloured boxes in my Fiddle and I think you also had a typo in your code, should
endIndex2 = ( $item.length )
be changed to:
endIndex2 = ( $item2.length )

Conflicting javascripts

I have two javascripts running on my webpage, one to dynamically resize the iframe height based on the content html and another to look up the title of the iframe content page and display it on the parent page. Both provided by other contributors on various forums.
My problem is if I have the iframe title displayed in the parent page code running all I get is a small iframe with vertical scroll bars. You can see this at www.katzxstitch.co.uk/shop (click on to the Terms and Conditions page).
If anyone could help I would be obliged. I am an amateur at html (trying to learn) and a total novice at javascript (also trying to learn).
Regards, Neil.
The javascript is as follows:
Resizing the iframe to the html content height:
function getDocHeight(doc) {
doc = doc || document;
// stackoverflow.com/questions/1145850/
var body = doc.body, html = doc.documentElement;
var height = Math.max( body.scrollHeight, body.offsetHeight,
html.clientHeight, html.scrollHeight, html.offsetHeight );
return height;
}
function setIframeHeight(id) {
var content_iframe = document.getElementById(id);
var doc = content_iframe.contentDocument? content_iframe.contentDocument: content_iframe.contentWindow.document;
content_iframe.style.visibility = 'hidden';
content_iframe.style.height = "10px"; // reset to minimal height ...
// IE opt. for bing/msn needs a bit added or scrollbar appears
content_iframe.style.height = getDocHeight( doc ) + 4 + "px";
content_iframe.style.visibility = 'visible';
}
iframe title displayed in parent page
document.getElementByName('content_iframe')[0].onload = function(){
document.title = window.frames.content_iframe.document.title;
};
Could anyone advise please

Jquery check if element is visible in viewport [duplicate]

This question already has answers here:
How to check if element is visible after scrolling?
(46 answers)
Closed 5 years ago.
Function to check if the div class "media" is within the browsers visual viewport regardless of the window scroll position.
<HTML>
<HEAD>
<TITLE>My first HTML document</TITLE>
</HEAD>
<BODY>
<div class="main">
<div class="media"></div>
</div>
</BODY>
</HTML>
Trying to use this plugin https://github.com/customd/jquery-visible with this function but
I don't know how to make it work.
$('#element').visible( true );
You can write a jQuery function like this to determine if an element is in the viewport.
Include this somewhere after jQuery is included:
$.fn.isInViewport = function() {
var elementTop = $(this).offset().top;
var elementBottom = elementTop + $(this).outerHeight();
var viewportTop = $(window).scrollTop();
var viewportBottom = viewportTop + $(window).height();
return elementBottom > viewportTop && elementTop < viewportBottom;
};
Sample usage:
$(window).on('resize scroll', function() {
if ($('#Something').isInViewport()) {
// do something
} else {
// do something else
}
});
Note that this only checks the top and bottom positions of elements, it doesn't check if an element is outside of the viewport horizontally.
Check if element is visible in viewport using jquery:
First determine the top and bottom positions of the element. Then determine the position of the viewport's bottom (relative to the top of your page) by adding the scroll position to the viewport height.
If the bottom position of the viewport is greater than the element's top position AND the top position of the viewport is less than the element's bottom position, the element is in the viewport (at least partially). In simpler terms, when any part of the element is between the top and bottom bounds of your viewport, the element is visible on your screen.
Now you can write an if/else statement, where the if statement only runs when the above condition is met.
The code below executes what was explained above:
// this function runs every time you are scrolling
$(window).scroll(function() {
var top_of_element = $("#element").offset().top;
var bottom_of_element = $("#element").offset().top + $("#element").outerHeight();
var bottom_of_screen = $(window).scrollTop() + $(window).innerHeight();
var top_of_screen = $(window).scrollTop();
if ((bottom_of_screen > top_of_element) && (top_of_screen < bottom_of_element)){
// the element is visible, do something
} else {
// the element is not visible, do something else
}
});
This answer is a summary of what Chris Bier and Andy were discussing below. I also used an answer to the following question to formulate my answer: Show Div when scroll position.
According to the documentation for that plugin, .visible() returns a boolean indicating if the element is visible. So you'd use it like this:
if ($('#element').visible(true)) {
// The element is visible, do something
} else {
// The element is NOT visible, do something else
}
You can see this example.
// Is this element visible onscreen?
var visible = $(#element).visible( detectPartial );
detectPartial :
True : the entire element is visible
false : part of the element is visible
visible is boolean variable which indicates if the element is visible or not.
var visible = $(".media").visible();

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