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How to save an image to localStorage and display it on the next page?
...ng as my localStorage value.
bannerImage = document.getElementById('bannerImg');
imgData = getBase64Image(bannerImage);
localStorage.setItem("imgData", imgData);
Here is the function that converts the image to a Base64 string:
function getBase64Image(img) {
var canvas = document.createElemen...
App Inventor 2 图片处理教程 - 缩放、裁剪、存储与转换 · App Inventor 2 中文网
...高质量缩放：
function resizeImage(dataUrl, maxW, maxH) {
var img = new Image();
img.onload = function() {
var ratio = Math.min(maxW / img.width, maxH / img.height);
var w = Math.floor(img.width * ratio);
var h = Math.floor(img.height * ratio);
var canvas = document.getE...
Automatic Retina images for web sites
...
There is a new attribute for the img tag that allows you to add a retina src attribute, namely srcset. No javascript or CSS needed, no double loading of images.
<img src="low-res.jpg" srcset="high-res.jpg 2x">
Browser Support: http://caniuse.com/#sea...
Concatenate strings in Less
... Variable Interpolation:
@url: "@{root}@{file}";
Full code:
@root: "../img/";
@file: "test.css";
@url: "@{root}@{file}";
.px{ background-image: url(@url); }
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How to overlay images
... like this:
<a href="[fullsize]" class="gallerypic" title="">
<img src="[thumbnail pic]" height="90" width="140" alt="[Gallery Photo]" class="pic" />
<span class="zoom-icon">
<img src="/images/misc/zoom.gif" width="32" height="32" alt="Zoom">
</span>
</a...
Absolute vs relative URLs
...bug.
Let's say you have used absolute URL everywhere in your code like <img src="http://yourdomain.com/images/example.png">. Now what will happen when you are going to:
switch to another scheme (e.g. http -> https)
switch domain names (test.yourdomain.com -> yourdomain.com)
In the firs...
Insert picture/table in R Markdown [closed]
... /fig /unnamed-chunk-1-1.png (generated by included R code)
/img /SS850452.png (my image used as background)
/js /impress.js
/layouts/custbg.html # content:--- layout: slide --- {{{ slide.html }}}
/libraries /frameworks /impressjs
...
Replacing H1 text with a logo image: best method for SEO and accessibility?
...he option:
<h1>
<a href="http://stackoverflow.com">
<img src="logo.png" alt="Stack Overflow" />
</a>
</h1>
title in href and img to h1 is very, very important!
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img tag displays wrong orientation
...here is a new CSS spec for image-orientation.
Just add this to your CSS:
img {
image-orientation: from-image;
}
According to the spec as of Jan 25 2016, Firefox and iOS Safari (behind a prefix) are the only browsers that support this. I'm seeing issues with Safari and Chrome still. However, ...
How to save a BufferedImage as a File
I am using the imgscalr Java library to resize an image .
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