I want to write a block of javascript or JQuery that will push all of my content 50 pixels to the right, if I set a variable, "tree," to true. So far, my R markdown document looks like this:
<script>
var tree = true;
if (tree===true){
$(document).ready(function(){
$("body").css(position,absolute);
$("body").css(left,left+50);
$("html").css(position,absolute);
$("html").css(left,left+50)
$("div.reveal").css(position,absolute);
$("div.reveal").css(left,left+50)
$("div.slides").css(position,absolute);
$("div.slides").css(left,left+50)
});
}
</script>
When I Knit the code, the content displays in the same position that it did without the javascript. Is it possible to push my content 50 pixels to the right using this method? If not, how else can I accomplish this? Any help will be very much appreciated!
If you want to stick to jQuery you could use margin-left:
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script>
var tree = true;
if (tree===true){
$(document).ready(function(){
$('.slides').css('margin-left', '50px');
});
}
</script>
From the following screenshot you can derive that all of the content (all slides) is contained within the div element that carries the class .slides:
With the script provided above the content moves the desired 50 pixels to the right (yellow area is the margin-left):
Related
I have simple page with an object that gets a "top" property from the javascript.
How do I run the function without getting things on my page to "jump" ?
<script type="text/javascript">
function changeHeight () {
//Gets height
var h = window.innerHeight;
//alert(h);
console.log(h);
var categories = document.getElementById("cat").offsetHeight;
//alert(categories);
var x = 0.32 * categories;
var catTop = h - x;
//Gets cats
document.getElementById("cat").style.top = catTop+"px";
}
</script>
</head>
<body onload="changeHeight()" onresize="changeHeight()">
<div class="main">
<div class="cat" id="cat"></div>
</div>
</body>
</html>
I used "onload" on the tag to run the function. Which I know that's not so good.
The object jumps because you move it after the DOM has been rendered. That's what onload does: Make sure the DOM is complete and all loading/rendering has happened.
There are two solutions:
Put the script element after the node.
Use CSS to position the element
The first solution looks like this:
<div class="main">
<div class="cat" id="cat"></div>
<script>...</script>
</div>
At the time when the script is executed, the necessary DOM nodes are there. Unless your layout is complex, the offsets should be correct at this time. Note that many browsers start rendering while the page is loading. So there still might be a jump but less often, depending on the complexity of the page, browser optimizations, etc.
The second solution is to wrap your element in a container where you set the margin/padding until the cat element is naturally positioned correctly. The 0.32 would be translated to 32%. You need another element around it which has the correct height but which isn't visible.
To final solution should give body height: 100%, then add two containers inside. One for the content and the other to position the cat element. You will need to play with position style. Then
#cat { top: 32% }
should do the trick.
I've been working on a new layout here: http://meaaas.tumblr.com/ it's a completely horrizontal layout, meaning it completely scrolls from side to side instead of up and down. Is there any possible way to use the current code i have to make it so that the posts would align to the vertical center instead of just being aligned to the top?
Easiest way to do it would be to write a quick little Jquery script:
var contain = $('#posts').height();
$('.post').each(function(){
var spacing = (contain - $(this).height());
var top = spacing/2;
$(this).css('margin-top', top);
});
UPDATE
Include this at the bottom of the page, before the 'BEGIN TUBMLR CODE' tag:
<script type="text/javascript">
$(document).ready(function(){
var contain = $('#posts').height();
$('.post').each(function(){
var spacing = (contain - $(this).height());
var top = spacing/2;
$(this).css('margin-top', top);
});
});
</script>
This is something notoriously tricky to do. This Article has a few suggestions, each with Pros and Cons.
If you're willing to add some javascript, that might be the simplest thing to understand. Just write some code that checks the size of the window and calculates what the top-margin should be. You could also add a resize function so that the margin is recalculated when the window size is changed (use the window.onresize event)
UPDATE here's some very naive javascript:
function verticallyCenter(elementID){
var windowheight = document.documentElement.clientHeight;
document.getElementById(elementID).style.marginTop = windowheight / 4;
}
Add that into a <script> block in the <head> of the page and then add onload="verticallyCenter(elementID)" to the <body> tag. You'll need to replace elementID with the ID of the div you want to center. You probably also want to account for the height of the content better than just using a quarter of the page height.
This is my code:
$( document ).ready(function() {
var target = $(".passthis").offset().top-$(window).height();
$(document).scroll(function() {
if ($(window).scrollTop() >= target) {
$(".something").fadeIn(2000);
}
});
});
HTML:
<div class="passthis" style="text-align:center;font-size:20px;margin-top:815px;">
Scroll Below here
</div>
Right now this code will show div.something only when the user passes div.passthis. The .passthis div is exactly at the bottom of the screen. Howver, I want to move .passthis the middle of the screen but being new to JS i am unsure how i can modify my script to do that. Can I use a number for x,y or something?
Question:
What can I do to move the .passthis to the middle of the screen and still make .something show after the user passes .passthis.
Here is a jsFiddle demo that you are welcome to play with. As I explained, if the window never scrolls, nothing is going to happen (.something will never appear). Additionally, you can see the numbers for the different values in this demo. It should give you an idea of what you're shooting for as far as the MATH of it all is concerned. As recommended above, you should read up on jQuery's .scrollTop() and other window dimensional methods and values.
I need to split some html content to pages, so that each page would have height of the screen and some predefined width. Page split can happen in the middle of paragraph (or probably some other html element), so this situation should be handled somehow.
What I really want to achieve is the effect of reading the book, page by page. I assume there will be a need for some javascript, so I'd prefer to to this with jQuery, but if other framework is required, it's also okay.
I have to admit that I'm quite new to HTML and all, so sorry if my guess is stupid, but currently I'm considering the following approach: measure actual height of the visible area (need to figure out how yet), then take my html document and incrementally take tag after tag, put this into invisible div and calculate its resulting height. When I'll have its height more than page height, I'm done. However, this approach will not work in case of long tags, e.g. long paragraph.
Thanks in advance.
EDIT: thanks for your previous answers. I tried to use approach of manual calculating the size of the elements, and encountered one problem which I cannot solve in a good way. This is problem of collapsing margins. What I'm trying to do is to loop through all the paragraphs in my document and sum up results of .outerHeight(true) jQuery call. This should give me the full height of element, including padding, margin and border. And it actually does what it says, but the problem here is that it doesn't take collapsing margins into account. Because of that I end up with wrong overall size (bigger than real one), because browser throws away some of margins (of adjacent paragraphs in my case), but I take them into account.
Any ideas how to solve this other than introducing the algorithm deciding which margins are collapsed and which are not? I think it is ugly...
You could use CSS3 multi-column rules, example: http://www.quirksmode.org/css/multicolumn.html
Or for support in all browsers use a javascript plugin: http://welcome.totheinter.net/columnizer-jquery-plugin/
This plugin even has a multi-page multi-column example: http://welcome.totheinter.net/2009/06/18/dynamic-multi-page-multi-column-newsletter-layout-with-columnizer/
I can think of one framework which seems to do what you need (and a bit more): https://github.com/Treesaver/treesaver
jQuery will give you the height (in pixels) of an element with the height() function.
jQuery("BODY").height() will give you the maximum height of the view port (though only if your content height is >= the height of the BODY - otherwise it will give you the height of how much space the body is taking up in the view port.)
Counting the heights of the P tags (or other tags) seems like a good way to go. I suppose if you want to break up the content of a P tag for large paragraphs, you could define a maximum "breakage" height for the last P tag on a page. You can then break rest of the contents of the P tag by creating a new P tag with jQuery("#the-next-page-id).append(jQuery("<P>"+restOfTheParagraphContent+"</P>"))
Use your own logic to calculate the height of each element in the html body
using jQuery code
$('selector').height();
Using this, you can calculate the height of some html elements and decide how much
elements should be displayed on your device screen.
for more, please visit jQuery Height Documentation
In case anyone still looking for something like this I recently did it using JQuery. It also leaves the first page empty (for title and such):
https://jsfiddle.net/xs31xzvt/
It basically iterates over the movable items and insert them into a new div if the previous div is full.
(function($) {
$(document).ready(formatPages)
function formatPages() {
var container = $('.container');
var subPage = $('.subpage').get(0);
var subPageHeight = subPage.offsetHeight;
var subPageScrollHeight = subPage.scrollHeight;
// See how many pages we'll need
var pages = Math.floor(subPageScrollHeight / subPageHeight) + 1;
//add a new page
var pageCount = 2;
var pageDiv = createPageDiv(pageCount);
var subPageDiv = createSubPageDiv(pageCount);
var addPage = function (){
pageCount++;
pageDiv = createPageDiv(pageCount);
subPageDiv = createSubPageDiv(pageCount);
pageDiv.append(subPageDiv);
container.append(pageDiv);
pageContentHeight = 0;
}
addPage()
container.append(pageDiv);
$('.movable').each(function() {
var element = $(this);
//remove the element
element.detach();
//try to add the element to the current page
if (pageContentHeight + element.get(0).offsetHeight > subPageHeight) {
subPageDiv.append(getFooterDiv().show());
//add a new page
addPage();
}
subPageDiv.append(element);
pageContentHeight += element.get(0).offsetHeight;
});
}
function createPageDiv(pageNum) {
return $('<div/>', {
class: 'page',
id: 'page' + pageNum
});
}
function createSubPageDiv(pageNum) {
return $('<div/>', {
class: 'subpage',
id: 'subpage' + pageNum
});
}
function getFooterDiv() {
return $('.footer').first().clone();
}
}(jQuery));
Here's what i have so far:
function loadOff(){
$(document).ready(function(){
$("#eLoader").ajaxStop(function(){
$(this).hide();
$("#eventsContent").show();
var h = document.body.scrollHeight;
$("#bodyBackground").css("height",h+100+"px");
$("#sidePanel1").css("height",h-105+100+"px");
$("#bottom").css("top",h+100+"px");
});
});
}
This is a callback function for a JQuery ajax function, basically what is does is when all ajax is finished .ajaxStop() it hides the loader then shows the content.
The problem i am having is adjusting bodyBackground, sidePanel, and bottom to fit the content. I dont care to have it elastic and retract for short content at this point, i would just like it to extend to proper positioning based on content length.
All divs are absolutely positioned. The numbers in the function are broken down simply to make it easy to explain. -105 is the offsetTop of that element and +100 is the margin between the end of the content and the elements.
if there is a better, more efficient way to achieve this outcome, please, do tell.
Thanks.
Based on your code, the only thing you ought to see is the top 105px of #sidePanel1. Is that your intent? (h = the bottom of the window, according to your code.)
Sticking with the JQuery patterns, you would use
var h = $(window).height();
Maybe you're looking for this instead of the browser window's height? It will get the height of the content element.
$("#eventsContent").outerHeight();