How can I prevent a div which contains a long list of items from expanding the page height. I want the div to take up the entire screen but no more so that it doesn't push the footer down.
Set an specific height for the div container, and also set overflow-y with auto in order to show the scroll bar only when the content of the div is larger than the height set in the container. Like this:
.container {
height: 500px;
overflow-y:auto;
}
Without js, it is not possible because your page can be viewed in different resolution. Different resolutions means different height. Matter of fact, you may want that behaviour when user resizes the browser window as well, am I right? So first, find out the height of the browser, subtract the height of the footer from it, and set this height to your container, which I believe you want to make scroll able on yaxis. That will solve the problem. All these tasks are pretty simple and you can do it by little googling.
Use JavaScript/jQuery for this:
jQuery Solution:
<div id="content-div">some content here</div>
$(document).ready(function() {
var height = $(document).height();
height = height - (your footer height);
$("#content-div").css({ 'max-height' : height.toString() });
});
Standard JavaScript solution:
<div id="content-div">some content here</div>
function myfunction () {
document.getElementById('content-div').style.height = getDocHeight() + 'px';
}
window.onload = myfunction();
document.getElementById('content-div').style.height = getDocHeight() + 'px';
function getDocHeight() {
var D = document;
return Math.max(
Math.max(D.body.scrollHeight, D.documentElement.scrollHeight),
Math.max(D.body.offsetHeight, D.documentElement.offsetHeight),
Math.max(D.body.clientHeight, D.documentElement.clientHeight)
);
}
Also, change CSS to:
#content-div { background-color:#1d1d1d; color:#eee; overflow-y: scroll; }
Related
Using w3css with a pinned navbar (ie enclosed in a with class w3-top) how can I know the height of the navbar (which will vary with screen size) so I can leave this much space at the top of my non-pinned content so the navbar doesn't overwrite content?
My best solution so far is to duplicate the navbar in javascript and insert that at the top of the page without the w3-top class so that there is a hidden element which is always the same size at the top of the page.
...
<div id="pinned_nav" class="w3-top">
<ul class="w3-navbar w3-light-grey w3-border">
<li>
...
<script type="text/javascript">
//Duplicate the nav without pinning it to the top - this means that the other content will adjust to height of pinned nav
var nav = document.getElementById("pinned_nav");
var nav_copy = nav.cloneNode(true);
nav_copy.classList.remove("w3-top");
nav.parentElement.insertBefore(nav_copy, nav);
</script>
...
Since this seemed less error prone than just copy and pasting the HTML block.
But it's still rather clunky and I just wondered if there was a simpler way I was missing.
Other questions like this one which are not w3css specific suggest using a fixed margin to skip a pinned toolbar but I can't see how to determine this margin height with a responsive navbar.
You could use a Javascript script to get the height and append it however you want to use it.
function getHeight() {
var nav = document.getElementById("pinned_nav");
var nav_height = nav.offsetHeight; //append this var where you need to.
alert(nav_height);
};
window.onload = getHeight();
window.onresize = getHeight(); //edit, added for if you resize the page
#pinned_nav {
height: 100px;
/*as example */
background-color: red;
}
<div id="pinned_nav" class="w3-top"></div>
EDT
Added resize event subscription.
I have a Canvas element that is inside a container div. When the user selects an image from his machine, this image should be displayed on the canvas. I want the canvas to be big as possible but at the same time keep the aspect ratio of the image. I know neither the proportions of the image nor the size of the container div, as this is relative to the screen/window size of the user.
If I set max-width and max-height to e.g 100% the canvas will not fill the container if the selected image is smaller then the container. If I set width and height instead of max-width and max-height the canvas doesn't keep the aspect ratio.
Does anyone have an idea how to solve this?
If you're willing to use JQuery (or regular JavaScript), then a solution like this might work:
<script>
// Note: this uses jQuery.
// It makes getting/setting the dimensions easier,
// but you can do this with normal JavaScript
var img = $("#img");
var container = $("#container");
var width = img.width();
var height = img.height();
var maxWidth = container.width();
var maxHeight = container.height();
var ratio = maxWidth / width;
if(height * ratio > maxHeight) {
ratio = maxHeight / height;
}
img.width(width * ratio);
img.height(height * ratio);
</script>
What this does is that it finds the ratio to multiply the width and the height by, whichever one is smaller (so that it will always fit in the window).
Update: Tested on JSFiddle.net. See it here.
I hope this helps you!
After reading your clarification about video, check out the following:
https://jsfiddle.net/d0dox9xt/
body {
background: #eee;
}
#container {
margin:0 2% 0 2%;
}
#v {
position:absolute;
top:0;
left:0;
width:100%;
}
The only trick is setting width:100%; This will maintain aspect ratio.
Note that in the JS
document.addEventListener('DOMContentLoaded', function(){
var v = document.getElementById('v');
var canvas = document.getElementById('c');
var context = canvas.getContext('2d');
}
function draw(v) {
c.drawImage(v, 0, 0);
}
The drawImage function can take many arguments. The first argument is inserting the media, the next two are for positioning. There are many arguments you can have to position and change the height and width. I left them alone so it will follow the CSS rules.
Here is a link to more on placing in canvas: https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/drawImage
Is there an elegant way to set breakpoints, of sorts, on height of containers.
Example:
Say you have a div and a min-height is set at say 100px. As soon as the content gets too much it doesn't just grow, but grows by another 100px and when the content eventually gets to the bottom of the 200px extend the height by another 100px.
Has anyone do anything like this before?
I don't think this is possible only using CSS, but you can use javascript:
html:
<div id='div'>hello</div>
javascript:
var div = document.getElementById('div');
var height = 0;
div.style.height = height + "px";
while(div.scrollHeight > div.clientHeight){
height += 50;
div.style.height = height+"px";
}
http://jsfiddle.net/fa7d0/JkT7R/
I found your question very interesting so i took the grow bit literally and created a fiddle where content changes is handled and the containing div is increased either in width or height by a defined threshold.
Fiddle: http://jsfiddle.net/Tvswj/1/
The main idea is that you'll only have to listen for DOM changes and then run a jQuery function as such:
// Trigger the resize function on content change
$(myDiv).bind('DOMNodeInserted DOMSubtreeModified DOMNodeRemoved', function () {
$(this).breakpointResize(threshold);
});
If you find it useful, please go ahead and use it and modify as you want.
Credits for DOM events: How to alert ,when div content changes using jquery
You can use container style height: auto ! Important; and min-height: 100px; width: 100%;
Is this possible? Essentially I'm trying to create a div layout that looks like:
<div_wrapper>
<div_header>
</div_header>
<div_content>
</div_content>
</div_wrapper>
Where upon page load, the div_header occupies 200px, and the div_content fills the remaining vertical space. And also, as the browser changes sizes (ie, user drags corner of browser to resize), the div_header still remains at 200px, which the div_content dynamically changes sizes.
Is this possible? Thanks.
This should do it..
#wrapper{height:100%;}
#header{
height:200px;
float:left;
width:100%;
}
#content{
height:100%;
}
i don't see any problem with div_header () just create a css rules that states:
#header{height:200px;}
you can use js to resize you content (). If you include jQuery
$(document).ready(function(){
$(window).resize(function(){
$('#content').css("height", ($(window).height() - 200) + "px");
});
$('#content').css("height", ($(window).height() - 200) + "px");
});
Hope this helps
I have a side bar that contains two divs. The first div may or may not have content, depending on what else is done on the page. The second div contains a long list of things and has a limited height, so scrolling is possible. I want to have the sidebar be as tall as the page, and I want the list container in the sidebar to be as tall as the sidebar minus the height of the header (which will change while using the page). I don't care about limiting the size of the header. The biggest is will get isn't anything significant.
Right now I'm just setting the height of the list container to be some number that is won't go over a maximized window height if the header div as as much content as it can, but this leaves an empty space at the bottom when the header is empty, and still doesn't work very well if the window is resized.
The layout is similar to this.
Is there a css solution to what I'm looking for, or will I have to use javascript and get window height/set div heights in pixels? I'm fine with either, it just seemed like there should be a CSS way to accomplish it.
If you're not opposed to using a little jQuery, here's a little code snippet that should help you equalize the height of the two divs, no matter which has more content. You can change it to your liking too.
var leftHeight = $(".left").height();
var rightHeight = $(".right").height();
var maxHeight = 0;
var div = "";
if (leftHeight >= rightHeight)
{
maxHeight = leftHeight;
div = ".right";
}
else
{
maxHeight = rightHeight;
div = ".left";
}
$(div).each(function(){
if ($(this).height() > maxHeight) { maxHeight = $(this).height(); }
});
$(div).height(maxHeight);
and credit where credit is due, this is an edit of a code snipped found at css-tricks.com
is this what you want?
http://jsfiddle.net/YWNyr/
CSS tips:
If you use 'absolute' positioning, width,height,left,top, etc... is relative to the first ancestor that has a "position" property other than "static", or the body if nothing is there.
for static menus, it is common to use 'position:fixed' as it will simplify scrolling issues
When using jquery its easier(and faster) to toggle a class than to change the DOM since that requires redrawing of the elements by the browser
-edit: for refreshing the sidebar size some javascript is necessary:
$('#headerAdd , #headerRemove').click( function()
{$('#sideContainer').height($(window).height()-$("#header").height());
} );
Try setting the height of your list container to 100%, and your overflow to scroll:
#listContainer {
height: 100%;
overflow: scroll;
}
This will keep the list in a scrollpane that reaches to the bottom of the page, no matter how large the header grows or shrinks.