image size adjust (no IDs) by a single javascript - javascript

How to adjust size of all images to 400*300 in a html file
keeping following conditions ?
with a single javascript located at the top
without any additional file like css
there are no Ids for images at present
In other words, I am finding a javascript (blahblah part) of a form
<script>
...
blahblah
...
</script>
<img src="image/01.jpg">
<img src="image/02.jpg">
...
<img src="image/99.jpg">
which will get the same effect as following
<img src="image/01.jpg" width=400 height=300>
<img src="image/02.jpg" width=400 height=300>
...
<img src="image/99.jpg" width=400 height=300>

window.addEventListener('DOMContentLoaded', (event) => document.querySelectorAll('img').forEach((img) => ([img.width, img.height] = [400, 300])), false);

Related

Removing a folder from multiple img src tags with JS

I have a site with many different gallery categories that display a smaller thumbnail size until the screen width is below 1200px, after which I would like to display the full size instead.
The images are displayed like so:
<section class="gallery category1">
<img id="cat1img1" src="cat1/small/img-1.jpg" alt="blah">
<img id="cat1img2" src="cat1/small/img-2.jpg" alt="blah">
etc...
</section>
<section class="gallery category2">
<img id="cat2img1" src="cat2/small/img-1.jpg" alt="blah">
<img id="cat2img2" src="cat2/small/img-2.jpg" alt="blah">
etc...
</section>
And all I want to do is use a JS media query with some jQuery to remove the "small/" from each tag without listing every single img so they can be freely added and removed without modifying the code again.
This is what I've tried but it's not changing the img url, though it does trigger my size change check:
function galleryBreak(x) {
if (x.matches) {
$('.gallery').children('img').attr('src').replace('/small','')
console.log('size change check');
};
};
var x=window.matchMedia('(max-width: 1200px)')
galleryBreak(x)
x.addListener(galleryBreak)
You have multiple (2) galleries and multiple images. You need to iterate over all images for all galleries. Something like this
function changeImagePaths(theGallery) {
var images = theGallery.querySelectorAll('img');
images.forEach( image => {
console.log('Path before: ', image.src)
image.src = image.src.replace('/small','')
console.log('Path AFTER: ', image.src)
});
};
var x=window.matchMedia('(max-width: 1200px)')
var myGalleries = document.querySelectorAll('.gallery')
myGalleries.forEach( gallery => {
if(x.matches) {
changeImagePaths(gallery)
}
});
<section class="gallery category1">
<img id="img1" src="cat1/small/img-1.jpg" alt="blah">
<img id="img2" src="cat1/small/img-2.jpg" alt="blah">
</section>
<section class="gallery category2">
<img id="img1" src="cat2/small/img-1.jpg" alt="blah">
<img id="img2" src="cat2/small/img-2.jpg" alt="blah">
</section>
JsFiddle to play with here
Now all of that said, if you can change the HTML please use Responsive images which will show you all you need can be set right in the image tag like:
<img srcset="elva-fairy-320w.jpg,
elva-fairy-480w.jpg 1.5x,
elva-fairy-640w.jpg 2x"
src="elva-fairy-640w.jpg"
alt="Elva dressed as a fairy">
add resize event listener on window so that on each window / browser resize this event will be fired
const galleryBreak = () => {
if (window.matchMedia('(max-width: 1200px)').matches) {
const images = document.querySelectorAll('.gallery img');
Array.from(images).forEach(img => {
const imgSrc = img.src.replace('/small', '');
img.src = imgSrc;
console.log(imgSrc);
});
}
};
window.addEventListener('resize', galleryBreak);

Javascript - change folder path, not the file

Im trying to figure out, on how to replace the folder path and not the img.
The folder names are always the same, they're are not dynamic. If i click button "one", it should change all my images folder paths to "dist/one/", the same logics goes for the two others.
<button id="one" type="button">This should change the path to "dist/one/"</button>
<button id="two" type="button">This should change the path to "dist/two/"</button>
<button id="three" type="button">This should change the path to "dist/three/"</button>
<img src="dist/one/rocket.png" alt="" />
<img src="dist/two/rocket.png" alt="" />
<img src="dist/three/rocket.png" alt="" />
I'd use a data attribute for this. Store a template for the image src and a path value for each button, then update the image src values accordingly for each button click...
var buttons = document.querySelectorAll("button");
var images = document.querySelectorAll("img");
[].forEach.call(buttons, function(button) {
button.addEventListener("click", function() {
var path = this.getAttribute("data-path");
[].forEach.call(images, function(img) {
var src = img.getAttribute("data-src-template").replace("{path}", path);
img.src = src;
console.log(img.src);
});
});
});
// intialize the image...
document.querySelector("#one").click();
<button id="one" type="button" data-path="dist/one">This should change the path to "dist/one/"</button><br/>
<button id="two" type="button" data-path="dist/two">This should change the path to "dist/two/"</button><br/>
<button id="three" type="button" data-path="dist/three">This should change the path to "dist/three/"</button><br/>
<img data-src-template="{path}/rocket.png" alt="" />
<img data-src-template="{path}/rocket.png" alt="" />
<img data-src-template="{path}/rocket.png" alt="" />
This gives you what you need as well as being flexible if the path format ever changes, since everything you need is defined in the html and the script never needs to change.
For example, if you decided to move the images into another subfolder you could just change the image tag and it would still work...
<img data-src-template="newSubFolder/{path}/rocket.png" alt="" />
I believe you can do that by creating script.
If you assign ID to each of the <img> tags you can then do something like:
document.getElementById('exampleID').innerHTML="<src="new_path">";
Eventually put each <img> tag in DIV
<div id=someid>
<img src="dist/one/rocket.png" alt="" />
</div>
Script:
document.getElementById('someid').innerHTML="<img src="new_path"/>";
I did not test it but the answer should be really close to this.
I hope this was helpfull.

Load and play a gif with javascript onclick event

On my website I have three images 1.png, 2.png and 3.png. When I click on 1.png, I want the animated gif 1a.gif to be loaded and shown/updated in the img tag located in <div id="container">. When I click on 2.png, 2a.gif should be displayed (while 1a.gif vanishes) and so on... This is my code:
<html>
<body>
<div>
<img src="1.png" onclick="document.getElementById('img').src = '1a.gif'" />
<img src="2.png" onclick="document.getElementById('img').src = '2a.gif'" />
<img src="3.png" onclick="document.getElementById('img').src = '3a.gif'" />
</div>
<div id="container">
<img id="img" src="1a.gif" />
</div>
</html>
</body>
It is working, however unreliable (tested with firefox and chrome)! When I refresh the html page and click on 1.png, than on 2.png ... suddendly at one point only the first frame of the animated gif is shown. I have to click on the same image (1,2 or 3.png) again in order to make the gif run. Why? I am looking for a light weight javascript solution without jquery. I am just asking myself why the gif is not played properly once I click on the image.
As a side note: It would be nice to show a loading image while the gif (5 MB) is loading. I failed to achive that using css:
#container {background:url('loading.png') no-repeat; }
In this case the loading image doesn't show up at all. Probably because I am updating directly from one (e.g. 1a.gif) to another (e.g. 2a.gif).
Showing it right before loading the gif did not help as well:
<img src="1.png" onclick="document.getElementById('img').src = 'loading.png';
document.getElementById('img').src = '1a.gif'" />
There are many ways of implementing this kind of thing, but to keep in line with how you're doing it, you'll want to hook into the onload event of the img.
Note that in this snippet, I don't have access to your GIFs, so I'm using the dummyimage.com service, which is pretty fast, so you don't see the "loading" for very long.
window.onload = function() {
var img = document.getElementById('img');
var container = document.getElementById('container');
var showImage = function showImage() {
img.style.display = "inline";
container.style.backgroundImage = "";
};
img.addEventListener('load', showImage);
img.addEventListener('error', showImage);
var thumbs = document.getElementsByClassName('thumb');
for (var i = 0, z = thumbs.length; i < z; i++) {
var thumb = thumbs[i];
var handler = (function(t) {
return function clickThumb() {
container.style.backgroundImage = "url('https://dummyimage.com/500x500/000/fff.gif&text=loading')";
img.style.display = "none";
img.src = t.dataset['image'];
};
})(thumb);
thumb.addEventListener('click', handler);
}
};
<div>
<img src="1.png" class="thumb" data-image="https://dummyimage.com/500x200/000/fff.gif" />
<img src="2.png" class="thumb" data-image="https://dummyimage.com/200x200/000/fff.gif" />
<img src="3.png" class="thumb" data-image="https://dummyimage.com/500x500/000/fff.gif" />
</div>
<div id="container">
<img id="img" class="main" />
</div>
This happens bacause the second img is not loaded yet!
I suggest you to put the 2 img in 2 different divs and the use javascript to hide/show the entire div!

Access an html node in javascript

I have following html code.
<div id="polaroid">
<figure>
<img src="assets/polaroid01.jpg" width="200" height="200" alt="Red mushroom" />
<figcaption>Pretty red mushroom</figcaption>
</figure>
<figure>
<img src="assets/polaroid02.jpg" width="200" height="200" alt="Rainbow near Keswick" />
<figcaption>Rainbow near Keswick</figcaption>
</figure>
<figure>
<img src="assets/polaroid03.jpg" width="200" height="200" alt="An old tree" />
<figcaption>Nice old tree</figcaption>
</figure>
</div><!--end polaroid-->
In this i want to store all the image tags in an array. I know, I can access the figure tags like this.
var images= document.getElementById('gall').getElementsByTagName('figure');
But i don't know how to access the image tag.
I tried this.
document.getElementById('gall').getElementsByTagName('figure').getElementsByTagName('img');
But this doesn't work.
In this case it's more convenient to use querySelectorAll:
var images = document.querySelectorAll('#gall figure img');
You mean like this:
var images= document.getElementById('gall').getElementsByTagName('figure');
images.getElementsByTagName("img");
This is possible if you use JQuery. Simply Do This.
Include Jquery Library (any version).
select image : $("#polaroid img").(any action);
Example:
put this above your code:
<script src="../js/jquery-1.7.2.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function() {
$("#polaroid img").css("border", "1px solid #000000");
});
</script>

Javascript img tag src switch function not working

I have a small app the uses 3 images as buttons, the images are different colors, above the image buttons there is a big pair of glasses, depending on what color button you press the color of the glasses will change to match the color of the button that was pressed. The problem is I am getting a "Cannot set src to null" error.
Here is a jsfiddle: http://jsfiddle.net/vAF8S/
Here is the function
//Functions that change the glasses image
function changeColor(a){
var img = document.getElementById("imgG");
img.src=a;
}
you have two Id's for the tag. you should have only one ID. change your html.
<section id="banner" >
<img id="imgG" src="images/orangeG.png"><br>
<img id="wcolorButton" src="images/whiteT.png" />
<img id="bcolorButton" src="images/blueT.png" />
<img id="ocolorButton" src="images/orangeT.png" onClick="changeColor('images/whiteG.png')" />
</section>
FIDDLE
you are getting this error because you have applied ID twice to the same element
use this HTML
<section id="banner" >
<img class="glasses" id="imgG" src="images/orangeG.png"><br>
<img class="wcolorButton" src="images/whiteT.png" />
<img class="bcolorButton" src="images/blueT.png" />
<img class="ocolorButton" src="images/orangeT.png" onClick="changeColor('images/whiteG.png')" />
</section>

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