Vue dynamic, async components (lazy load)

Vue is very nice framework that allows us to simply and quickly create apps. After many many hours and after hundreds of lines, our app can be big, really big. It’s bad for user experiences, because of long loading and delays. If we use a lot of components and many of them are rendering conditionally, we can load them asynchronously, as other chunks. How do this? It’s very simple, we must just import required files not always, but only on demand – something like lazy loading. Everything is build-in, so we only have to make only few small changes.

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Vue-fragment – many components inside template

Vue is very nice JS framework with – in my opinion – very clean and simple structure. It’s separate HTML, CSS and JavaScript, in effect it’s much cleaner than React. But Vue is not ideal, and sometimes its limitations can be strange and annoying. Good example is that we must use only one child elements on every component. It doesn’t matter in many cases, but try to render table with some child components and conditions – I promise you, it will be real nightmare.

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Vue.js – global event bus

Vue is very nice JavaScript framework – fast to use and with clean code. Most of rules are logical and easy to understand, but some limitations may be strange and problematic. One of them is one-way data flow. We can pass data from parents to child elements automatically, but in reverse, use only events data. Sometimes it may be an issue, because we have nested components structure and would like to send event to top level parent.

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Fabric.js – change uploaded image color

Painting

Fabric.js is amazing library – I know, that we have a lot of drawing possibilities using canvas element, but “vanilla version” is not very readable and difficult to use. With fabric.js, everyting is much simpler and cleaner, we can also use a lot of build-in tools. One of them is image filters. We can modify images in many ways, apply for example sepia filter, but also make other changes. Last time I must just change image color. Yep, user can upload image (or I load image using static url), and I want to force using color, not original. Diffucult? Not with fabric.js.

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Traverse – very useful npm package

NPM has a lot, a lot of useful packages… and a lot of useless packages of course. Sometimes we can find something very nice. Last time I must modified nested object in JavaScript. I can write my own function to do this, use recursion for example, but I simply… didn’t have enough time to do this. I must find solution quickly, good solution. I and found – it’s traverse package. Yes, its name is very meaningful.

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