MARCH 8, 2021

If you multiple Vue components of the same type throughout your application but they're not in the same parent DOM element, mounting them may not be as easy as calling their parent.

Mounting multiple Vue components with a shared parent

In this first example, we can mount all of our button-counter components by mounting their parent, #button-container.

<div id="button-container">

We just need to make one call.

new Vue({ el: '#button-container' });

But what if our components are spread throughout different HTML elements?

Mount multiple Vue components without a shared parent

Imagine you have components of the same (or different) types spread throughout your website's DOM.




We can iterate through the DOM elements and mount them one by one.

// Obtain all button-counter elements
let elements = document.getElementsByTagName('button-counter');

// Convert HTMLCollection to array
let arr = elements )

// Loop through array and mount all elements
arr.forEach((el) => {
    new Vue( { el });

Note that we had to convert the HTMLCollection to a JavaScript array before we could call the .forEach() function to iterate over the button-counter host DOM nodes.

This works with Vue 2, and Vue 3 recently released new features for multi-root components and optional TypeScript support.

MARCH 8, 2021

Change this.

window.Vue = require('vue');

For this.

window.Vue = require('vue').default;

Then this should work.

window.Vue = require('vue').default;
window.VueResource = require('vue-resource');

MARCH 31, 2020

Pretty impressed by ImgIX's JSON format. Long story short, it provides a JSON metadata file for each resource you are serving via ImgIX (say, an image or a video) as in the example below just by appending fm=json to any image request.

For this image.

You'd load the JSON at.

What's nice is that with the imgix.js JavaScript library you can fetch the JSON file for each picture and—before loading any image data—decide how to deliver the image. In this CodePen provided by ImgIX, they crop a set of images to fit a certain aspect ratio (which ends up saving data as they cropped bits of each image are never loaded) avoiding also having to play with image background CSS tricks in order to fit an image to a given aspect ratio (as the image already has it!).

    "Exif": {
        "PixelXDimension": 1500,
        "DateTimeDigitized": "2019:11:20 10:43:28",
        "PixelYDimension": 1500,
        "ColorSpace": 65535
    "Orientation": 1,
    "Output": {},
    "Content-Type": "image\/jpeg",
    "JFIF": {
        "IsProgressive": true
    "DPIWidth": 144,
    "Content-Length": "180595",
    "Depth": 8,
    "ColorModel": "RGB",
    "DPIHeight": 144,
    "TIFF": {
        "ResolutionUnit": 2,
        "DateTime": "2019:11:20 11:17:40",
        "Orientation": 1,
        "Software": "Adobe Photoshop CC 2019 (Macintosh)",
        "YResolution": 144,
        "XResolution": 144
    "PixelWidth": 1500,
    "PixelHeight": 1500,
    "ProfileName": "Display"

And here's the JavaScript included in that CodePen that does all the magic.

// Demonstrate the use of the `fm=json` parameter to resize images
// to a certain aspect ratio, using ES6.

let ratio = 16 / 9;
let maxSize = 300;

let placeImages = function () {
    jQuery('.imgix-item').each((i, value) => {
        let $elem = jQuery(value);
        // We pull down the image specific by the 'data-src' attribute
        // of each .imgix-item, but append the "?fm=json" query string to it.
        // This instructs imgix to return the JSON Output Format instead of 
        // a manipulated image.
        let url = new imgix.URL($elem.attr('data-src'), { fm: "json" }).getUrl();

        jQuery.ajax(url).success((data) => {
            let newWidth, newHeight;

            // Next, we compute the new height/width params for 
            // each of our images.
            if (data.PixelHeight > data.PixelWidth) {
                newHeight = maxSize;
                newWidth = Math.ceil(newHeight / ratio);
            } else {
                newWidth = maxSize;
                newHeight = Math.ceil(newWidth / ratio);

            // Now, we apply these to our actual images, setting the 'src'
            // attribute for the first time.
            $elem.get(0).src = new imgix.URL($elem.attr('data-src'), {
                w: newWidth,
                h: newHeight,
                fit: "crop"


MARCH 20, 2020

Maker.js: Parametric CNC Drawings Using JavaScript

Microsoft recently open sourced, twenty five days ago, Maker.js — a JavaScript library to create drawings on the browser for CNC and laser cutting.

I love the playground site they made to share parametric scripts (say, of a smiley face, a hello, world text, a floor plan, and more). See all demos.

From their website:

  • Drawings are a simple JavaScript object which can be serialized / deserialized conventionally with JSON. This also makes a drawing easy to clone.
  • Other people's Models can be required the Node.s way, modified, and re-exported.
  • Models can be scaled, distorted, measured, and converted to different unit systems.
  • Paths can be distorted.
  • Models can be rotated or mirrored.
  • Find intersection points or intersection angles of paths.
  • Traverse a model tree to reason over its children.
  • Detect chains formed by paths connecting end to end.
  • Get the points along a path or along a chain of paths.
  • Easily add a curvature at the joint between any 2 paths, using a traditional or a dogbone fillet.
  • Combine models with boolean operations to get unions, intersections, or punches.
  • Expand paths to simulate a stroke thickness, with the option to bevel joints.
  • Outline model to create a surrounding outline, with the option to bevel joints.
  • Layout clones into rows, columns, grids, bricks, or honeycombs.

Via @alfarok's GitHub stars.

SEPTEMBER 10, 2019

A cheat-sheet for mathematical notation in [JavaScript] code form.

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