I have three 12×12 arrays, each with R, G and B values. How would I go about outputting the image (12×12) using HTML Canvas? I’ve come across Canvas demos that show drawing lines and whatnot, but nothing like providing some RGB arrays to produce something. Any guidance is greatly appreciated. Answer You can use the fillRect method, described here :
Tag: image
Lazy Loading HTML5 picture element
I have been searching (unsuccessfully) for a reliable method to lazy load images while using the HTML5 spec for <picture>. Most solutions/plugins out there currently rely on using data- attributes. I could be wrong, but it doesn’t seem this method will work in conjunction w/ <picture>. I’m really just looking to be pointed in the right direction. If anyone has
How do you get the file size of an image on the web page with Javascript?
I’d like to be able to get the file size on an image on a webpage. So let’s say I have an image on the page (that has loaded) like this: How do I call a function in Javascript (or, even better, jquery) to get the file size (not the dimensions) of the image? It’s important to note that I’m
Get image width and height from the Base64 code in JavaScript
I have a Base64 image encoded that you can find here. How can I get the height and the width of it? Answer
OnClick thumbnails – load image
I have a simple image gallery of about 25-30 photos with a thumbnails strip What i want is to load only the image that i click the thumbnail for not to wait until all the 25-30 photos are loaded because it slows down my website. Any ideas how to do that? Answer First, put all 25-30 photos on the page
simple search results page: if/else issues using localStorage variables and document.write
working on a mini page for some homework and I’m stuck! What we’ve been told to do it to pull localStorage variables from a fake “registration” page we’ve made (which gets it’s information from a user’s choice of three radio buttons) and use that information to alter what the user will see on a fake, very basic “e-commerce” site. What
Check image width and height before upload with Javascript
I have a JPS with a form in which a user can put an image: I have written this js: which works fine to check file type and size. Now I want to check image width and height but I cannot do it. I have tried with target.files[0].width but I get undefined. With other ways I get 0. Any suggestions?
How to convert a byte array into an image?
Using Javascript, I’m making an AJAX call to a WCF service, and it is returning a byte array. How can I convert that to an image and display it on the web page? Answer I realize this is an old thread, but I managed to do this through an AJAX call on a web service and thought I’d share… I
How to silently hide “Image not found” icon when src source image is not found
Do you know how to hide the classic “Image not found” icon from a rendered HTML page when an image file is not found? Any working method using JavaScript/jQuery/CSS? Answer You can use the onerror event in JavaScript to act when an image fails to load: In jQuery (since you asked): Or for all images: You should use visibility: hidden
Get the Size of a CSS Background Image Using JavaScript?
Is it possible to use JavaScript to get the actual size (width and height in pixels) of a CSS referenced background image? Answer Yes, and I’d do it like this… Some notes… We need to remove the url() part that JavaScript returns to get the proper image source. We need to split on , in case the element has multiple