I have a div ( position :fixed ) with varying height depending on the content in it. To have an auto scroll for that i have added overflow-y:auto and assigned a fixed height.
Is there a way to auto set the height of the div so that when the browser space gets changed, the height of the div changes accordingly, and if there is not enough space the scroll bar appears and when there is enough available space the scroll bar disappears.
use position:absolute instead of position: fixed and use the top left, right and bottom co-ordinates and set the scroll to auto;
example HTML:
<div id="resize">
<p>content</p><p>content</p><p>content</p><p>content</p>
</div>
CSS:
#resize {
background: #f00;
color: white;
position: absolute;
top: 100px;
left: 200px;
right: 200px;
bottom: 100px;
overflow: auto;
}
p {line-height: 3; margin: 0;}
Working Example : Here
Use two DIVs, one nested inside of the other.
The outer DIV should be set to position:fixed;max-height:100%;overflow-y:auto
The inner DIV will contain your contents. So far as I can tell, it won't require any specific styles.
What should happen (and what's happening when I test this fix in my browser) is that the outer DIV should shrink-wrap to fit the inner DIV -- but it will not exceed the height of the window. If the inner DIV exceeds the height of the window, it will also exceed the height of the outer DIV, producing a scrollbar.
EDIT: Sample markup:
<div id="outer">
<div class="inner">
Content goes here.
</div>
</div>
And the CSS:
#outer{
position:fixed;
max-height:100%;
overflow-y:auto;
bottom:0; /* sample value */
left:0; /* sample value */
}
#outer div.inner{
/* Whatever style you want the positioned box
to have. Border, padding, background, etc. */
}
You can listen to the resize event on the window and update the width accordingly.
$(window).resize(function() {
});
http://api.jquery.com/resize/
Alternatively, depending on the layout of your page, you might be able to just use height: 100% (or another % that works for you).
Related
I have a timer bar showing the remaining time of a contest. As the user answers more questions of the event, scrolling down, I want the timer to be fixed in its position. I know this can be achieved by setting the CSS position to fixed.
But fixed needs either a width set for the element, or left and right values. My problem is that the layout of the page is boxed, with margins at the left and right of the "box", and it depends on the user's viewport, how much width there is for the box in the middle...
How can I calculate the width once the page loads and then set that width to the timer bar in order for fixed property to get the data it needs?
I tried setting it to 100%, but for position: fixed 100% means 100% of the viewport, not of the parent element, so the bar grows from the right, outside of the viewport (if you can get what I mean), since there are margins on the left and right of the boxed layout...
Use position: sticky;
.wrapper {
text-align: center;
max-width: 768px;
}
.progress {
position: sticky;
background: red;
top: 0;
}
/* tall content to cause scrollbars */
main > div {
height: 100vw;
}
<h1>Title above stickied progress</h1>
<div class="wrapper">
<div class="progress">
<progress></progress>
</div>
<main>
<div>Example of a very long step</div>
<div>Example of a very long step</div>
</main>
</div>
You can use the 'vw' CSS unit to get a percentage of viewport width. For example width: 50vw; would set it to 50% of the current viewport width.
You can also use calc() to do calculations. For example, if I know I want something to be a third of the current viewport width I could set width: calc(100vw/3);
See this Fiddle, how can I center the blue div without fixed width and height in the parent and child?
This is to post in SO
<div class="parent">
<div class="child">
</div>
</div>
Update
These are positioned elements, I want child at the center of the screen.
Update 2
See it centered here, but I can't use fixed widths nor heights in parent neither children. I need positioned elements because I need them to be over other elements.
To center a div, you simply have to add this attribute:
margin-left: auto;
margin-right: auto;
or a more condensed version (assuming 0px for the top and bottom margin):
margin: 0px auto;
This assumes that you have some sort of width value on that element you want to center, whether fixed or a percentage. You shouldn't need anything in the parent to dictate the child's margins.
margin-top: -50%; /* why this takes the width of the parent ???? */
It's because your parent div has position: fixed and your child div has position: absolute and since absolute position element is positioned relative to the first parent element that has a position other than static.
So your child div will take a margin top and margin left with a value equal to -50% of your parent width which is -50% * 150 = 75px
Try this it's display in center of width.
<div class="parent">
<div class="child">
</div>
</div>
<style type="text/css">
.parent{
}
.child{
background: none repeat scroll 0 0 lightblue;
height: 50px;
margin: 0 auto;
width: 150px;
}
</style>
I think this could solve your problem, but this needs JQuery[.width()].
.parent{
position: fixed;
/* I can't use static width nor height, TO DELETE(try changing this)*/
width: 500px;
height: 400px;
background: red;
}
.child{
display: inline-block;
position: absolute;
/*Simulate width and height, these are actually calculated by content*/
width: 100px;
height:50px;
background: lightblue;
}
JQuery onLoad:[JSFiddle]
$(function changePostion() {
var s = $(".parent").width();
var e = $(".child").width();
var d= (s-e)/2;
$(".child").css({"left":d});
var sh = $(".parent").height();
var eh = $(".child").height();
var dh= (sh-eh)/2;
$(".child").css({"top":dh});
});
This article is a best tutorial for positioning html attribute in center. There might be a better way to do without using JQuery.
Dynamic modals can be the biggest pains in the world. You need JS to change the heights and widths. Can you use a plugin? If so here are some good options. Twitter bootstrap has a modal that's very easy to get set up but it's challenging to load divs via ajax and iframes. You have to choose one or the other. simplemodal (http://www.ericmmartin.com/projects/simplemodal/) is good but you still need to do a lot of the work yourself. It works with iframes and ajax content.
For some reason, I can't get this to work:
Website
(The red and green boxes will be removed once they're properly positioned.)
Thanks for the help.
The overall concept of centering something in css is quite simple. First you need a relative positioned container. The child element to be centered must have a fixed width and height and be absolute positioned at 50% from the top and 50% from the left, and both top and left margins must be negative half of the width and height respectively. In other words:
<div id="container">
<img src="" alt=""/>
<div class="box"></div>
</div>
.
#container { position: relative; }
img { dispaly: block; } /* It fills the container */
#box {
position: absolute;
width: 300px; /* Fixed */
height 150px; /* Fixed */
top: 50%;
left: 50%;
margin-top: -75px; /* 300/2 */
margin-left: -150px; /* 150/2 */
}
As suggested, you can do this with CSS positioning tho for what you appear to be trying to do, you might be better off using an image map
http://www.w3schools.com/tags/tag_map.asp
This allows you to set certain regions of an image as a link.
Try to set the following properties along with position
top:0;
left:0;
you can also set top or left property in order to make the boxes visible at the center
and if you want that your boxes will remain inside the center div then make the div with id splash to position: relative
it will help in solving your issue
I am trying to make a pinned down style menu like this:
http://www.w3.org/Style/Examples/007/menus
Except I want the horizontal positioning to be more flexible.
I know that I can do that having a percentage value in "right:" instead of a constant, but i want the menu to fit snugly in a centered blog layout as the sidebar, which means when the page is resized, the sidebar shouldn't cover the content. Similarly, the box shouldn't spread away from the content if i make the page bigger.
Any way to do this with only css? If not, perhaps an easy javascript solution?
Here's one way to do this with some generic code:
HTML:
<div id="container">
<div id="content"></div>
<div id="sidebar"></div>
</div>
CSS:
Set an explicit width on the container and the content, leaving room for the sidebar in the container. Horizontally center the container.
#container {
width: 200px;
margin: 0 auto;
}
#content {
width: 150px;
}
Now we're going to position: fix the sidebar relative to the center of the page instead of relative to the right edge of the page. Make it the width of the left over space in the container and give it a margin-left (or padding-left, depending on other things you may want to do with it) equal to the width of the content. Then set right: 50% (for a right sidebar, switch these values to left for left sidebar) and margin-right to negative one half the container width:
#sidebar {
width: 50px;
margin-left: 150px;
position: fixed;
right: 50%;
margin-right: -100px;
/* other styles such as "top", etc. */
}
Resize the window and it stays snug to the content and vertically positioned wherever you place it.
Here's a fiddle (with some extra styles for visual clarity): http://jsfiddle.net/blineberry/UkEkS/
I have a page which is divided up into 3 divs, left center and right. I don't want to display anything in the left and right, they just frame the page.
#leftDiv
{
background-color: Gray;
width: 10%;
left: 0px;
top: 0px;
position: absolute;
height: 100%;
}
#rightDiv
{
background-color: Gray;
height: 100%;
width: 10%;
left: 90%;
top: 0px;
position: absolute;
clear:both;
}
The center div has a table, which allows the user to select how many rows to see. If they chose a large value then the body of the table went beyond the bottom of the left and right div.
To correct this I put the following code in
if ($("#leftDiv").length == 1) {
$("#leftDiv").height($("body").height() + "px");
}
if ($("#rightDiv").length == 1) {
$("#rightDiv").height($("body").height() + "px"); ;
}
this works fine until the user selects a smaller value than the page size, after selecting a larger value.
Then the left and right divs get set to less than 100%.
What i need is a way to find out what 100% is in pixels and then I can compare this to the height of the body and decide which is bigger.
Any ideas?
Thanks
John
Use margin: 0 auto
Kill your left and right columns, give your main div a width, and then center that div using an auto left and right margin. For example:
#mainDiv {
width: 80%;
margin: 0 auto;
}
Why are you creating empty elements to frame the page? How about setting the body background to the colour you require and:
#center_div {width: /* whatever */;
margin: 0 auto; /* to center in the viewport */
overflow: auto; /* or visible */
}
You could leave off the overflow property, and simply use min-width in place of width (I can't remember how cross-browser compatible this is) to define the 'normal' width, in such a way that the content will force the div to be larger as required to display the content.
If the left and right divs don't have any contents, then there's no need for them to be separate divs: apply their formatting to your container div instead, and center your contents div using margin: 0 auto. Obviously, you'll need to give the container div a specified width, and a non-transparent background. Then you can let the browser take care of resizing the window as needed - there's no need for you to reinvent the wheel for that part.
CSS:
#container {background-color:gray;}
#content {background-color:white;width:80%;margin:0 auto;}
Html:
...
<body>
<div id="container">
<div id="content">
...your content here...
</div>
</div>
</body>
...
(If your page doesn't have a container div, then you can apply the background color to the body element instead, and save even more code.)