Okay so I want to have an image that I select through CSS to be fluid based, however, this is the problem that I run into.
This is what I think in my head I have to do, however, it doesn't work:
#image { background-image:pic.jpg; height:100%; width:100%; }
But, you can't have this tag use the "height:100%;", correct? You have to set it to a pixel width. But if I want it to be fluid.. then I can't set it to a pixel width, correct?
Is there another way to do this? Thanks.
If you do it this way it will be fluid:
HTML:
<img src="http://news.bbcimg.co.uk/media/images/62777000/jpg/_62777247_62777242.jpg" alt="" />
CSS:
​img {
width: 100%;
}​
http://jsfiddle.net/7hMbQ/1/
Or if you want to stretch width and height to 100% try this (but the ratio will not be correct):
http://jsfiddle.net/7hMbQ/3/
If you mean "fluid" in the sense that I'm thinking of it (responsive design sort of 'fluid'), then setting the "max-width" to "100%" should make sure that the image never overflows past its container (or in other words, goes past 100% width).
img { max-width: 100%; }
EDIT: If your issue is making the height maintain the aspect ratio, just don't specify a height property, or if you need to override an attribute setting, set the height to auto (!important) too:
img { max-width: 100%; height: auto !important; }
Related
(Similar questions are already asked at stackoverflow, but this question has more constraints, such as both a specific max-width, max-height, a required specific height and width, and no layout shift.)
Problem:
I want to have a responsive image with the following constraints:
max-width: 100%, so that it doesn't overflow to the right, and that it is responsive when reducing the screen width.
max-height: 200px, so that large images are reduced in rendered dimensions.
height and width html attributes set, so that the browser can precalculate the required image dimensions, so that the layout doesn't shift/move elements beside/below the image, while the image is loading. (To reduce the cumulative layout shift.)
image aspect ratio should stay 1:1
no extra margins should be created around the image
the image should be rendered with a plain html img tag, not with css background-images
the image should not be rendered in a larger dimension than its original dimension
How can I achieve this with CSS?
(If CSS cannot achieve this, then maybe in JavaScript?)
What I tried
I tried several CSS features, such as object-fit and max-width: 100% etc, but I always get at least one of the contraints failing while trying to fix another constraint. For example, object-fit creates margins/paddings for the image when it's reduced in size when the screen size reduces, as if the image border isn't reduced. This is demonstrated in the following code:
https://codepen.io/Devabc/pen/mdVvyKq
/* Should appear to the right of the Wombat */
.beside {
float: left;
background-color: lightgreen;
border: 1px solid;
height: 200px;
width: 100px;
}
/* Should appear below the Wombat */
.below {
background-color: red;
border: 1px solid;
width: 100px;
height: 300px;
clear: both;
}
img {
display: block;
float: left;
max-width: 100%;
max-height: 200px;
border: 1px solid;
/* Without this, aspect ratio is not normal.
But with this, it creates an unwanted margin. */
object-fit: scale-down;
object-position: left;
}
<img
height="533"
width="799"
src="https://upload.wikimedia.org/wikipedia/commons/thumb/1/18/Vombatus_ursinus_-Maria_Island_National_Park.jpg/800px-Vombatus_ursinus_-Maria_Island_National_Park.jpg"
/>
<div class="beside">This text should be directly to the right of the Wombat, without any margin between the Wombat and this text.</div>
<div class="below">This text should be directly below the Wombat, without any margin between this and the Wombat.
The dimensions of the original Wombat img are:
width: 799px, height: 533px</div>
(The green text should be to the right of the Wombat, without margin. But object-fit causes a padding/margin to appear with the length of the original image.)
It's feels almost as if this isn't possible with CSS, even though these requirements shouldn't be too much to ask nowadays, with responsive design being important.
How can I fix this with HTML/CSS?
I've been struggling with this for years on end, but just today I figured a way to do it when you know the image's aspect ratio, hope it helps:
Start by defining a --img-ratio CSS custom property in the img element corresponding to the image's height / width ratio.
<!-- example of a square image (height / width = 1) -->
<img src="..." style="--img-ratio: 1" />
Knowing that our desired max-height is 200px (or you could go with a generic --max-height), we know 2 variables of the equation:
ratio = height / width
width = height * ratio
Applying this:
img {
--max-height: 200px;
/* Set a baseline width for your element */
width: 100%;
/* And limit it with our function above (pick 100% with min() if this size is bigger than parent's width to prevent overflowing) */
max-width: min(100%, calc(var(--max-height, 200px) * var(--img-ratio, 1)));
}
And there we go! This should work to limit the height without extra margins even in complicated flex layouts.
Let me know if this answer is unclear, hope it helps 🌻
PS: If you can't know the ratio of the image beforehand, than maybe JS is indeed your only option - I'm yet to find an alternative 😟
If CSS cannot achieve this, then maybe in JavaScript?
I wouldn't solve this with JavaScript. I understand you want to use width & height on img elements to mitigate content layout shifts, but in this case since you must have a max-height of 200px on the image, it will cause issues on images with larger natural width. The space you see between the green text & the Wombat is not margin or padding, it is that actual content width which you have defined as 799px.
You can solve this with a bit of preparation on the data you wish to present to the user. Prepare your width as you would expect what your image width would be. width=799 in this case is unrealistic because the image will not respond as far as that because of the max-height:200px limitation - same case with height=533. The whole point of using static measurements such as unit pixels is you are already declaring that this X element will just take Y space.
<img
height="200"
width="300"
src="https://upload.wikimedia.org/wikipedia/commons/thumb/1/18/Vombatus_ursinus_-Maria_Island_National_Park.jpg/800px-Vombatus_ursinus_-Maria_Island_National_Park.jpg"
/>
If your problem is that your webpage/website is not responsive, so I would suggest you to use Viewport Units like vw for width and vh for height instead of px or % for all your elements including border and font-size because it will help you make your webpage/website responsive.
It should solve your issue but if it doesn't let me know in the comments, I will try my best to help you.
I have an image (say 150 x 300), and I want to change just the width to 1 pixel but want the image to maintain its original height of 300 pixels (there is actual logic to this end goal, I swear). So my final image would be 1 x 300.
Of course this should be as easy as:
img {
width:1px;
height:300px;
}
But the tricky part is, I don't know the height of the image. This image is dynamic and could have any dimensions. How can I force CSS to ignore the aspect ratio and make the height maintain its initial value? I know this would be quite easy with jQuery, but I'd like to accomplish it with CSS alone. Any ideas?
Thanks in advance!
If the height attribute is defined on your image, your can simply achieve it with this CSS:
img {
width: 1px;
}
http://jsfiddle.net/yvr57/
In pure CSS you may use clip in conjunction with position: absolute
img {
position: absolute;
clip: rect(0px 1px auto 0);
}
Example: http://codepen.io/anon/pen/siyDe
As you can see, you don't need to specify the height of the image (auto does the trick). In a real page you would probably need to enclose the image in a container with position: relative
If you mean "resize the image WITHOUT taking into account the aspect ratio", you can set the CSS3's object-fit property of the image to object-fit: fill.
img {
width: 1px;
object-fit: fill;
}
Repsonsive web design works great on most html elements excepts images.I find it a mess. When resizing viewports, you cannot use resizing percentages on an image since it will take on the parent element width and height right. You need to set fixed widths and heights for images...Or am I missing something?
So how exactly do you do a responsive design involving images whose container element/parent will stretch above its native width and shrink below its native width?
Thank you
The done thing in responsive design is to set this in your css for images and some other elements:
img, embed, object, video {
max-width:100%;
height:auto;
}
Then in your html the image simply takes up the size of it's container.
You do not set the image size itself you just let it grow/shrink itself.
well - you can write: .selector img{width: 100%; height: auto;} and then use the size of the div it is in to determine it's scale. or you can also set the image as a background and use similar methods and maybe even mess around with background-size: cover. i'll make a jsfiddle...
.image-w img {
display: block;
width: 100%;
height: auto;
}
What I have done on my site is this:
page stuff....
div class=picr>
img src="/Images/Home/MountainPine.jpg" alt="Mountain Pine" id="mountainpine" >
<p>Caption about mountain pine</p>
/div>
Then in CSS
pic, pic6 {
float: left;
}
...
.pic, .picr {
width: 37%;
}
#content img {
width: 100% ;
}
So the div class is styled, and the picture is set to fill it. By using the div, then I can also style within the .pic classes to be distinctive from the body text.
i'm currently trying to make an image resize depending on the browser dimensions. I've managed to get the image to resize horizontally, if I make the browser window narrow the image will resize proportionally just fine. However when I resize the window vertically, Firefox just doesn't seem to want to do it! The code is pretty simple
<body>
<div id="content">
<img src="images/abc.jpg">
</div>
</body>
and the CSS:
#content {
height: 100%;
padding: 50px;
}
#content img{
max-height:100%;
max-width: 100%;
}
Another issue is that the image does seem to resize vertically in chrome, but i have to drag the bottom of the browser well over the image before it start doing this. I'd rather the image start to rezise as soon as the bottom content padding "hits" the bottom of the image so to speak. Hope this is making sense.
Any help much appreciated
try this, taken from Twitter bootstrap 2
html,body{height:100%;}
#content {padding: 5%;}
#content img {
max-height: 100%;/* Part 1: Set a maxium relative to the parent */
width: auto\9;
/* IE7-8 need help adjusting responsive images */
max-width: auto;
/* Part 2: Scale the height according to the width, otherwise you get stretching */
vertical-align: middle;
border: 0;
-ms-interpolation-mode: bicubic;
}
Because height could potentially go on forever, you cant set the height of anything relative to the browser window to be a function of percent. What i'm saying is that you will need to put it inside of something with a fixed height to use a per-cent value. Good Luck!
-b
You've only specified the "max-height" and "max-width" properties.
If you don't specify the actual "width" or "height" properties, the image initialy takes the width and height of its physical dimensions (if not larger than the specified max-height and max-width).
Said that, the behaviour you've noticed, is correct.
The answer is, as already mentioned, to specify also a initial width or height property, dependig wether your image is portrait or landscape.
Is that what you want?
I actually just added a height to html and body, so that #contents height doesn't get to high.
body, html {
height: 100%;
margin: 0;
padding: 0;
}
(And box-sizing: border-box to #content, because it seems like you'd want that)
Now I face a problem with defining image attribute height and width as I don't know its dimension from the server. Then I think about assigning width/height to auto.
e.g.
img {
height: auto;
width: auto;
}
but I am concerning about rendering performance images without specific width/height. I would like front end developers here to help with this concern.
Hey now define your img width in 100%
as like this
<div class="imgtagcss">
<img src="xxx.jpg" >
</div>
Css
.imgtagcss{
width:xxx;
}
.imgtagcss img{
width:100%;
}
Give width and height has a 100% in css. So when css is loaded all the image tag will be setted to 100%. This doesn't give any performance effect.