Set image max size - javascript

I need to set maximum height and width of a image in <img> tag. For example say max size is 400x400 px so if the image size is smaller than this then it will show the image as it is and if size is bigger then this then it should be compressed to this size. How can I do this in html or javascript?

Set the max-width and max-height in CSS
max-width: 400px;
max-height: 400px;

You can also use object-fit: scale-down to make image fit a container size if it's too big and leave image size as is if it's smaller than the container.
CSS:
.img-scale-down {
width: 100%;
height: 100%;
object-fit: scale-down;
overflow: hidden;
}
HTML:
<div style="width: 400px;">
<img src="myimage.jpg" class="img-scale-down"/>
</div>

try using a div tag of that size and putting image inside:
<div style="width:400px; height400px;>
<img style="text-align:center; vertical-align:middle; max-width:400px; max-height:400px;" />
</div>
or something like that. The div is the full size and the image can only expand to its borders.

The way I did it:
When the image is being uploaded I use a server side library to resize if the image is bigger (only). You always resize down, never up.
Then on the client side I do not set the image size.
The image will be 400x400 only for those images that were exactly that size or bigger.

In JavaScript you can use:
/* getting the image */
var img = document.createElement('img');
img.src = "img.png";
/* setting max width and height */
document.getElementById("id").appendChild(img).style.maxWidth = "400px";
document.getElementById("id").appendChild(img).style.maxHeight = "400px";
/* inserting image */
document.getElementById("id").appendChild(img);

img
{
max-width: 400px;
max-height: 400px;
}
Like so: http://jsfiddle.net/fMuVw/

Related

object-fit:cover resizes img width

I'm trying to make a carousel slide, but when I'm using object-fit:cover and adding the second image the first and the second image width are changing from 100% to 50%
on 1 input it works fine
See photo here
on second input it's changing its width
See photo2 here
I think the object-fit:cover property can be set with the width property.
image {
width: 100%;
object-fit: cover;
}
Then the image places appropriately so that it's width is 100%.
If you really want img to be 100% in flex layout you can use one of these options:
img {
width: 100%;
flex-shrink: 0;
}
img {
min-width: 100%;
}
If smth else - update/improve your question

CSS/JS: mimic background-image cover using image element with known width and height

I am trying to create letterboxes for video thumbnails in css. Thumbnails can be any size but I want them to fit within a box with a fixed aspect ratio of 16:9. This is easy to accomplish if I use the background-image properties. See the example below:
.container {
background-color: gray;
position: relative;
width: 100%;
padding-top: 56.25%;
background-size: contain;
background-repeat: no-repeat;
background-position: center;
}
.container1 {
background-image: url("https://bulma.io/images/placeholders/640x480.png");
}
.container2 {
background-image: url("https://bulma.io/images/placeholders/720x240.png");
}
<div class="container container1">
</div>
<br/>
<div class="container container2">
</div>
However, using background-image introduces a few problems. I only want the background of .container to be gray while the thumbnail is loading, once it has loaded I want it to be black. I also want to replace the thumbnail url with a default thumbnail url if for some reason the thumbnail fails to load. I cannot think of a way to do this without being able to use the onload and onerror events of an actual image element.
Fortunately, since in my actual code I am fetching the thumbnail urls dynamically I can also return the width and height of a thumbnail so I know it before I try to load it. However, I cannot figure out how to convert the width and height of the thumbnail into the correct percent it needs to be to cover the center of the box the same way the first example does using background-image. See the example below:
let c1ThumbnailWidth = 640;
let c1ThumbnailHeight = 480;
let c2ThumbnailWidth = 720;
let c2ThumbnailHeight = 240;
$( document ).ready(function() {
$('.container1 img').css('left', 100 * (1 - (9 / 16) * (c1ThumbnailWidth / c1ThumbnailHeight)) / 2 + '%');
$('.container2 img').css('left', 100 * (1 - (9 / 16) * (c2ThumbnailWidth / c2ThumbnailHeight)) / 2 + '%');
$('.container img').one('load', function() {
$(this).parent().css('background-color', '#000');
});
$('.container img').on('error', function () {
$(this).attr('src', 'default.jpg');
});
});
.container {
background-color: gray;
position: relative;
width: 100%;
padding-top: 56.25%;
}
.container img {
position: absolute;
top: 0;
height: 100%;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="container container1">
<img src="https://bulma.io/images/placeholders/640x480.png">
</div>
<br/>
<div class="container container2">
<img src="https://bulma.io/images/placeholders/720x240.png">
</div>
How can I make the image element mimic the behavior of a background-image set to cover or alternatively how can I tell when a background-image has loaded or failed to load and adjust it accordingly?
Have you tried using CSS object-fit on the image element?
https://developer.mozilla.org/en-US/docs/Web/CSS/object-fit

Set width to 100% to make it responsive in js

so i have this code
<div style="text-align:center; max-width:500px; width:100%; margin:auto"> <script type="text/javascript" src="transition_example.js"></script></div>
this is the transition_example.js:
var show1=new slideshow({
wrapperid: "myslide",
wrapperclass: "sliceClass",
imagearray: [
["1.jpg"],
["2.jpg"]
],
pause: 9000, //pause between content change (millisec)
transduration: 1000 //duration of transition (affects only IE users)
})
i want to set the images to display at 100% width so when the screen resizes the js script resizes too.
Can't find a way to achieve it, i could really use some help.
Thanks in advance!
To make an image responsive to it's container, assuming your container doesn't have a fixed width, just add width: 100% or max-width: 100% to the img.
width: 100% will make the image as wide as the container, and it will scale with it.
.sliceClass img {
width: 100%;
}
<div class="sliceClass">
<img src="http://kenwheeler.github.io/slick/img/fonz1.png">
</div>
max-width: 100% will make the image responsive with the container, but the image width will not expand beyond it's actual width.
.sliceClass img {
max-width: 100%;
}
<div class="sliceClass">
<img src="http://kenwheeler.github.io/slick/img/fonz1.png">
</div>
You can add this css to apply a 100% to the sliceClass generated img
.sliceClass {
width: 100%;
img {
width: 100%;
}
}

displaying image of unknown size inside div of fixed size

I have a <div> of fixed size say height:100px and width:100px.
I have to display images of unknown size inside this <div> such that following cases arise:
image width > div width
image width < div width
image width = div width
image height > div height
image height < div height
image height = div height
no matter what, what is the best cross browser strategy, with support for legacy browsers, to display them with following criteria:
no white space around image
nicely centered (horizontally and vertically) if overflow
To eliminate white space, set min-height and min-width to 100% for the images. To clip the overflow, set overflow: hidden on the div. To center overflowing images, use absolute positioning and some JavaScript to set top and left values based on the size of the image.
Edit: If the image is larger than the container in both dimensions, use some JavaScript to remove the minHeight and minWidth and then set the height to 100%. If that leaves whitespace on the width, set height to "" and set width to 100%:
.centeredImageContainer {
height: 100px;
width: 100px;
overflow: hidden;
position: relative;
}
.centeredImage {
min-width: 100%;
min-height: 100%;
position: absolute;
}
function centerImage(img) {
var container = img.parentNode;
if (img.offsetHeight > container.clientHeight &&
img.offsetWidth > container.clientWidth) {
img.style.minHeight = "0";
img.style.minWidth = "0";
img.style.height = "100%";
if (img.offsetWidth < container.clientWidth) {
img.style.height = "";
img.style.width = "100%";
}
}
img.style.top = ((container.offsetHeight - img.offsetHeight) / 2) + "px";
img.style.left = ((container.offsetWidth - img.offsetWidth) / 2) + "px";
}
jsfiddle.net/QRU4w/2
edit:
fiddle
html:
<div id="myPic"></div>
css, if you want a big pic to shrink to fit while still filling the whole div, and want a small pic to expand to fill the whole div:
#myPic{
width: 100px;
height: 100px;
background-image: url(/abs/path/img.jpg);
background-size: cover;
}
css, if you want a big pic to only display a window of the middle without resizing:
#myPic{
width: 100px;
height: 100px;
background-image: url(/abs/path/img.jpg);
background-position: center center;
}
I don't know of a way to both expand small images to fit, while not shrinking big images.
If you mean that you need to have no whitespace including above a landscape-oriented image, for example (i.e. the photo needs to fill the square, regardless of whether it is originally a square), then you may want to look into setting the image as the div's background and using background-size: cover. See this link for browser support.
The best way to do this is by using object-fit property.
.image-container {
width: 400px;
height: 300px;
}
.centered-image {
width: 100%;
height: 100%;
object-fit: cover;
}
<div class="image-container">
<img src="https://24seven.co.ke/uploads/sliders/1550944223ecommmerce.jpg" alt="24seven Developers slider" class="centered-image">
</div>
For more illustrations and geeks see this.

Resizing Images As Window is Resized?

Currently I have four images side by side. When the window is resized or viewed on a smaller device it does a line jump (three images and the fourth one beneath it). However what I want is for all four images to just shrink relative to the window size. To make it clear, I've included some images and my code. Here's the jsfiddle as well: http://jsfiddle.net/hxeJb/
^ That is what I currently have.
^ That is what I want to achieve.
HTML:
<div id="headerline">
<img src="http://s21.postimg.org/l6t6akypj/line.jpg"/>
</div>
<div id="menu">
<img class ="blog" src="http://s18.postimg.org/il7hbk7i1/image.png">
<img class ="music" src="http://s18.postimg.org/4st2fxgqh/image.png">
<img class ="projects" src="http://s18.postimg.org/sxtrxn115/image.png">
<img class ="bio" src="http://s18.postimg.org/5xn4lb37d/image.png">
</div>
CSS:
#headerline {
width: 100%;
overflow: hidden;
margin: -10px auto 20px auto;
}
#menu {
max-width: 700px;
text-align: center;
margin: auto;
}
#menu img {
width: 150px;
}
http://jsfiddle.net/hxeJb/2/
#menu img {
width: 20%;
}
See if this help you, just don't provide a fixed width, let image width relative to its parent width
Observing your CSS part in jsFiddle, I think assigning width in percentage rather than fixed pixels will resolve your problem.
You can try this instead of current CSS.
#menu img {
width: 31.33%;
}
Hope this might help you.
The other answers are probably all correct but you may want to add a max-width: 150px; so that hte image does not expand too big and lose quality.
#menu img {
width: 30%;
max-width: 150px;
}
Fiddle: http://jsfiddle.net/hxeJb/4/
Try with the width in percentage to set the image size as per the browser width. It's always preferable to set the width in percentage(instead of pixel) while re-sizing the element based on window re-sizing.
#menu img {
width: 25%; //give the width as per the requirement
}
Hope this will solve your problem :)

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