1607673000
React Image is an <img>
tag replacement and hook for React.js, supporting fallback to alternate sources when loading an image fails.
React Image allows one or more images to be used as fallback images in the event that the browser couldn’t load the previous image. When using the component, you can specify any React element to be used before an image is loaded (i.e. a spinner) or in the event that the specified image(s) could not be loaded. When using the hook this can be achieved by wrapping the component with <Suspense>
and specifying the fallback
prop.
React Image uses the useImage
hook internally which encapsulates all the image loading logic. This hook works with React Suspense by default and will suspend painting until the image is downloaded and decoded by the browser.
react-image
using npm:npm install react-image --save
<script src="https://unpkg.com/react-image/umd/index.js"></script>
react-image
has no external dependencies, aside for a version of react
and react-dom
which support hooks and @babel/runtime
.
You can use the standalone component, documented below, or the useImage
hook.
The useImage
hook allows for incorperating react-image
’s logic in any component. When using the hook, the component can be wrapped in <Suspense>
to keep it from rendering until the image is ready. Specify the fallback
prop to show a spinner or any other component to the user while the browser is loading. The hook will throw an error if it failes to find any images. You can wrap your componenet with an Error Boundry to catch this scenario and do/show something.
Example usage:
import React, {Suspense} from 'react'
import {useImage} from 'react-image'
function MyImageComponent() {
const {src} = useImage({
srcList: 'https://www.example.com/foo.jpg',
})
return <img src={src} />
}
export default function MyComponent() {
return (
<Suspense>
<MyImageComponent />
</Suspense>
)
}
useImage
API:srcList
: a string or array of strings. useImage
will try loading these one at a time and returns after the first one is successfully loaded
imgPromise
: a promise that accepts a url and returns a promise which resolves if the image is successfully loaded or rejects if the image doesn’t load. You can inject an alternative implementation for advanced custom behaviour such as logging errors or dealing with servers that return an image with a 404 header
useSuspense
: boolean. By default, useImage
will tell React to suspend rendering until an image is downloaded. Suspense can be disabled by setting this to false.
returns:
src
: the resolved image addressisLoading
: the currently loading status. Note: this is never true when using Suspenseerror
: any errors ecountered, if anyWhen possible, you should use the useImage
hook. This provides for greater flexability and provides support for React Suspense.
Include react-image
in your component:
import {Img} from 'react-image'
and set a source for the image:
const myComponent = () => <Img src="https://www.example.com/foo.jpg" />
will resolve to:
<img src="https://www.example.com/foo.jpg">
If the image cannot be loaded, <img>
will not be rendered, preventing a “broken” image from showing.
When src
is specified as an array, react-image
will attempt to load all the images specified in the array, starting at the first and continuing until an image has been successfully loaded.
const myComponent = () => (
<Img
src={['https://www.example.com/foo.jpg', 'https://www.example.com/bar.jpg']}
/>
)
If an image has previously been attempted unsuccessfully, react-image
will not retry loading it again until the page is reloaded.
const myComponent = () => (
<Img
src={['https://www.example.com/foo.jpg', 'https://www.example.com/bar.jpg']}
loader={/*any valid react element */}
/>
)
If an image was previously loaded successfully (since the last time the page was loaded), the loader will not be shown and the image will be rendered immediately instead.
const myComponent = () => (
<Img
src={['https://www.example.com/foo.jpg', 'https://www.example.com/bar.jpg']}
unloader={/*any valid react element */}
/>
)
The following options only apply to the <Img>
component, not to the useImage
hook. When using the hook you can inject a custom image resolver with custom behaviour as required.
By default and when supported by the browser, react-image
uses Image.decode()
to decode the image and only render it when it’s fully ready to be painted. While this doesn’t matter much for vector images (such as svg’s) which are rendered immediately, decoding the image before painting prevents the browser from hanging or flashing while the image is decoded. If this behaviour is undesirable, it can be disabled by setting the decode
prop to false
:
const myComponent = () => (
<Img src={'https://www.example.com/foo.jpg'} decode={false} />
)
When loading images from another domain with a CORS policy, you may find you need to use the crossorigin
attribute. For example:
const myComponent = () => (
<Img src={'https://www.example.com/foo.jpg'} crossorigin="anonymous" />
)
A wrapper element container
can be used to facilitate higher level operations which are beyond the scope of this project. container
takes a single property, children
which is whatever is passed in by React Image (i.e. the final <img>
or the loaders).
For example, to animate the display of the image (and animate out the loader) a wrapper can be set:
<Img
src={'https://www.example.com/foo.jpg'}
container={(children) => {
return <div className="foo">{children}</div>
}}
/>
The <img>
will now be contained by the div
with class foo
which can be targeted via css. A crude example of a transition using ReactCSSTransitionReplace can be found here. Error reporting (i.e. logging images that loaded ok or failed to load) can be accomplished with container
, too. A sample implementation can be found here.
By default, the loader and unloader components will also be wrapped by the container
component. These can be set independently by passing a container via loaderContainer
or unloaderContainer
. To disable the loader or unloader from being wrapped, pass a noop to loaderContainer
or unloaderContainer
(like unloaderContainer={img => img}
).
By definition, React Image will try loading images right away. This may be undesirable in some situations, such as when the page has many images. As with any react element, rendering can be delayed until the image is actually visible in the viewport using popular libraries such as react-visibility-sensor
. Here is a quick sample (psudocode/untested!):
import {Img} from 'react-image'
import VisibilitySensor from 'react-visibility-sensor'
const myComponent = () =>
<VisibilitySensor>
<Img src='https://www.example.com/foo.jpg'>
</VisibilitySensor>
Note: it is not nesesary to use React Image to prevent loading of images past “the fold” (i.e. not currently visable on in the window). Instead just use the native HTML <img>
element and the loading="lazy"
prop. See more here.
see above
react-image
is available under the MIT License
Author: mbrevda
Source Code: https://github.com/mbrevda/react-image
#react #reactjs #javascript
1598839687
If you are undertaking a mobile app development for your start-up or enterprise, you are likely wondering whether to use React Native. As a popular development framework, React Native helps you to develop near-native mobile apps. However, you are probably also wondering how close you can get to a native app by using React Native. How native is React Native?
In the article, we discuss the similarities between native mobile development and development using React Native. We also touch upon where they differ and how to bridge the gaps. Read on.
Let’s briefly set the context first. We will briefly touch upon what React Native is and how it differs from earlier hybrid frameworks.
React Native is a popular JavaScript framework that Facebook has created. You can use this open-source framework to code natively rendering Android and iOS mobile apps. You can use it to develop web apps too.
Facebook has developed React Native based on React, its JavaScript library. The first release of React Native came in March 2015. At the time of writing this article, the latest stable release of React Native is 0.62.0, and it was released in March 2020.
Although relatively new, React Native has acquired a high degree of popularity. The “Stack Overflow Developer Survey 2019” report identifies it as the 8th most loved framework. Facebook, Walmart, and Bloomberg are some of the top companies that use React Native.
The popularity of React Native comes from its advantages. Some of its advantages are as follows:
Are you wondering whether React Native is just another of those hybrid frameworks like Ionic or Cordova? It’s not! React Native is fundamentally different from these earlier hybrid frameworks.
React Native is very close to native. Consider the following aspects as described on the React Native website:
Due to these factors, React Native offers many more advantages compared to those earlier hybrid frameworks. We now review them.
#android app #frontend #ios app #mobile app development #benefits of react native #is react native good for mobile app development #native vs #pros and cons of react native #react mobile development #react native development #react native experience #react native framework #react native ios vs android #react native pros and cons #react native vs android #react native vs native #react native vs native performance #react vs native #why react native #why use react native
1621250665
Looking to hire dedicated top Reactjs developers at affordable prices? Our 5+ years of average experienced Reactjs developers comprise proficiency in delivering the most complex and challenging web apps.
Hire ReactJS developers online on a monthly, hourly, or full-time basis who are highly skilled & efficient in implementing new technologies and turn into business-driven applications while saving your cost up to 60%.
Planning to** outsource React web Development services from India** using Reactjs? Or would you like to hire a team of Reactjs developers? Get in touch for a free quote!
#hire react js developer #react.js developer #react.js developers #hire reactjs development company #react js development india #react js developer
1632537859
Not babashka. Node.js babashka!?
Ad-hoc CLJS scripting on Node.js.
Experimental. Please report issues here.
Nbb's main goal is to make it easy to get started with ad hoc CLJS scripting on Node.js.
Additional goals and features are:
Nbb requires Node.js v12 or newer.
CLJS code is evaluated through SCI, the same interpreter that powers babashka. Because SCI works with advanced compilation, the bundle size, especially when combined with other dependencies, is smaller than what you get with self-hosted CLJS. That makes startup faster. The trade-off is that execution is less performant and that only a subset of CLJS is available (e.g. no deftype, yet).
Install nbb
from NPM:
$ npm install nbb -g
Omit -g
for a local install.
Try out an expression:
$ nbb -e '(+ 1 2 3)'
6
And then install some other NPM libraries to use in the script. E.g.:
$ npm install csv-parse shelljs zx
Create a script which uses the NPM libraries:
(ns script
(:require ["csv-parse/lib/sync$default" :as csv-parse]
["fs" :as fs]
["path" :as path]
["shelljs$default" :as sh]
["term-size$default" :as term-size]
["zx$default" :as zx]
["zx$fs" :as zxfs]
[nbb.core :refer [*file*]]))
(prn (path/resolve "."))
(prn (term-size))
(println (count (str (fs/readFileSync *file*))))
(prn (sh/ls "."))
(prn (csv-parse "foo,bar"))
(prn (zxfs/existsSync *file*))
(zx/$ #js ["ls"])
Call the script:
$ nbb script.cljs
"/private/tmp/test-script"
#js {:columns 216, :rows 47}
510
#js ["node_modules" "package-lock.json" "package.json" "script.cljs"]
#js [#js ["foo" "bar"]]
true
$ ls
node_modules
package-lock.json
package.json
script.cljs
Nbb has first class support for macros: you can define them right inside your .cljs
file, like you are used to from JVM Clojure. Consider the plet
macro to make working with promises more palatable:
(defmacro plet
[bindings & body]
(let [binding-pairs (reverse (partition 2 bindings))
body (cons 'do body)]
(reduce (fn [body [sym expr]]
(let [expr (list '.resolve 'js/Promise expr)]
(list '.then expr (list 'clojure.core/fn (vector sym)
body))))
body
binding-pairs)))
Using this macro we can look async code more like sync code. Consider this puppeteer example:
(-> (.launch puppeteer)
(.then (fn [browser]
(-> (.newPage browser)
(.then (fn [page]
(-> (.goto page "https://clojure.org")
(.then #(.screenshot page #js{:path "screenshot.png"}))
(.catch #(js/console.log %))
(.then #(.close browser)))))))))
Using plet
this becomes:
(plet [browser (.launch puppeteer)
page (.newPage browser)
_ (.goto page "https://clojure.org")
_ (-> (.screenshot page #js{:path "screenshot.png"})
(.catch #(js/console.log %)))]
(.close browser))
See the puppeteer example for the full code.
Since v0.0.36, nbb includes promesa which is a library to deal with promises. The above plet
macro is similar to promesa.core/let
.
$ time nbb -e '(+ 1 2 3)'
6
nbb -e '(+ 1 2 3)' 0.17s user 0.02s system 109% cpu 0.168 total
The baseline startup time for a script is about 170ms seconds on my laptop. When invoked via npx
this adds another 300ms or so, so for faster startup, either use a globally installed nbb
or use $(npm bin)/nbb script.cljs
to bypass npx
.
Nbb does not depend on any NPM dependencies. All NPM libraries loaded by a script are resolved relative to that script. When using the Reagent module, React is resolved in the same way as any other NPM library.
To load .cljs
files from local paths or dependencies, you can use the --classpath
argument. The current dir is added to the classpath automatically. So if there is a file foo/bar.cljs
relative to your current dir, then you can load it via (:require [foo.bar :as fb])
. Note that nbb
uses the same naming conventions for namespaces and directories as other Clojure tools: foo-bar
in the namespace name becomes foo_bar
in the directory name.
To load dependencies from the Clojure ecosystem, you can use the Clojure CLI or babashka to download them and produce a classpath:
$ classpath="$(clojure -A:nbb -Spath -Sdeps '{:aliases {:nbb {:replace-deps {com.github.seancorfield/honeysql {:git/tag "v2.0.0-rc5" :git/sha "01c3a55"}}}}}')"
and then feed it to the --classpath
argument:
$ nbb --classpath "$classpath" -e "(require '[honey.sql :as sql]) (sql/format {:select :foo :from :bar :where [:= :baz 2]})"
["SELECT foo FROM bar WHERE baz = ?" 2]
Currently nbb
only reads from directories, not jar files, so you are encouraged to use git libs. Support for .jar
files will be added later.
The name of the file that is currently being executed is available via nbb.core/*file*
or on the metadata of vars:
(ns foo
(:require [nbb.core :refer [*file*]]))
(prn *file*) ;; "/private/tmp/foo.cljs"
(defn f [])
(prn (:file (meta #'f))) ;; "/private/tmp/foo.cljs"
Nbb includes reagent.core
which will be lazily loaded when required. You can use this together with ink to create a TUI application:
$ npm install ink
ink-demo.cljs
:
(ns ink-demo
(:require ["ink" :refer [render Text]]
[reagent.core :as r]))
(defonce state (r/atom 0))
(doseq [n (range 1 11)]
(js/setTimeout #(swap! state inc) (* n 500)))
(defn hello []
[:> Text {:color "green"} "Hello, world! " @state])
(render (r/as-element [hello]))
Working with callbacks and promises can become tedious. Since nbb v0.0.36 the promesa.core
namespace is included with the let
and do!
macros. An example:
(ns prom
(:require [promesa.core :as p]))
(defn sleep [ms]
(js/Promise.
(fn [resolve _]
(js/setTimeout resolve ms))))
(defn do-stuff
[]
(p/do!
(println "Doing stuff which takes a while")
(sleep 1000)
1))
(p/let [a (do-stuff)
b (inc a)
c (do-stuff)
d (+ b c)]
(prn d))
$ nbb prom.cljs
Doing stuff which takes a while
Doing stuff which takes a while
3
Also see API docs.
Since nbb v0.0.75 applied-science/js-interop is available:
(ns example
(:require [applied-science.js-interop :as j]))
(def o (j/lit {:a 1 :b 2 :c {:d 1}}))
(prn (j/select-keys o [:a :b])) ;; #js {:a 1, :b 2}
(prn (j/get-in o [:c :d])) ;; 1
Most of this library is supported in nbb, except the following:
:syms
.-x
notation. In nbb, you must use keywords.See the example of what is currently supported.
See the examples directory for small examples.
Also check out these projects built with nbb:
See API documentation.
See this gist on how to convert an nbb script or project to shadow-cljs.
Prequisites:
To build:
bb release
Run bb tasks
for more project-related tasks.
Download Details:
Author: borkdude
Download Link: Download The Source Code
Official Website: https://github.com/borkdude/nbb
License: EPL-1.0
#node #javascript
1650364405
Pick the right hash tags and enjoy likes and comments on the post.
Making engaging reels about the travels, fashion, fitness, contest, and more, the results are not satisfactory. All you get is a few likes, comments and nothing else. You need the engagement on your post to bring more business to you. How can you bring interaction to the content? Indeed you can buy real instagram likes uk to get high rates. But how can you make the Instagram world hit the likes button under the post? You need to boost the reach. You must present your content to the right audiences to get higher interaction rates.
Your Instagram #tags are the power tool that works like magic for influencers and businesses. The blue text with # is the magical option that increases the viability of the posts. The Instagram algorithm keeps on changing, and now the engagement on the post is a must to place the content at a higher place in followers’ feed. For this, you require more likes and comments under the post. For this, you must lift the reach by using perfect tags.
Why are hashtags popular on Instagram?
Let me clear it for you. Do you know how many active users this digital handle has? It is about 2B and more, and the count is changing every day. Each of the followers must be posting something on the handles. Thousands of profit must be of a similar niche as yours. If you are the business and running the clothing brands, then many other companies deal with clothes. So, customers or followers have many choices to choose from. Why would they follow you or purchase from your companies?
Your reply must be that you offer quality material at the best rates. But how does anyone finds out about you? Indeed you can buy active instagram followers uk to bring more fans, but how can you boost the reach of your voices. All businesses must represent their product to the right audiences, but how?
Of course, hashtags.
Table of Contents
There are some basic tags that you can use, but if you are more specific about your approach, choose the relevant tags for your business. Your #tags game must be industry oriented. So in this part, you will learn about the famous tags as per various niches.
Tags for Travel Niche
Indeed this niche is famous on Instagram, and influencers earn handsome amounts. These #tags are best for you if you possess a similar place. Use them smartly and rightly!
#TravelPhotography
#PicOfTheDay
#NaturePhotography
#TravelBlogger
#beautiful
#landscape
#adventure
#explore
#instatravel
#photo
#trip
#summer
#travelgram
#photography
#art
#travel
#wanderlust
#nature
#instagood
#PhotoOfTheDay
After thee travel next most famous niche is fashion. You can earn handsome amount form it. But for this you need to pick the right tags form the following:
So, what to boost your fitness business then uses these tags and enjoys likes:
Best Tags for Giveaway
So, are you arranging the giveaway and want a maximum number of people to participate? If so, then it is time to boost the reach vis using these tags
Are you the reels queen, or do you want to become the one? Then these below mentioned tags are for you. But don’t go for all of them because you can use only thirty of them. Pick it smartly!
Do you love to eat and what to share your experience with another foodie on Instagram? If you are visiting any cafe, then before uploading, always add one of the following tags!
There is a long list of each niche, and you can use all of them. If you are confused about what to pick and whatnot, here is the guide to choosing the perfect tag.
Study your competition. Review their post and study the tags they are using.
1615544450
Since March 2020 reached 556 million monthly downloads have increased, It shows that React JS has been steadily growing. React.js also provides a desirable amount of pliancy and efficiency for developing innovative solutions with interactive user interfaces. It’s no surprise that an increasing number of businesses are adopting this technology. How do you select and recruit React.js developers who will propel your project forward? How much does a React developer make? We’ll bring you here all the details you need.
Facebook built and maintains React.js, an open-source JavaScript library for designing development tools. React.js is used to create single-page applications (SPAs) that can be used in conjunction with React Native to develop native cross-platform apps.
In the United States, the average React developer salary is $94,205 a year, or $30-$48 per hour, This is one of the highest among JavaScript developers. The starting salary for junior React.js developers is $60,510 per year, rising to $112,480 for senior roles.
In context of software developer wage rates, the United States continues to lead. In high-tech cities like San Francisco and New York, average React developer salaries will hit $98K and $114per year, overall.
However, the need for React.js and React Native developer is outpacing local labour markets. As a result, many businesses have difficulty locating and recruiting them locally.
It’s no surprise that for US and European companies looking for professional and budget engineers, offshore regions like India are becoming especially interesting. This area has a large number of app development companies, a good rate with quality, and a good pool of React.js front-end developers.
As per Linkedin, the country’s IT industry employs over a million React specialists. Furthermore, for the same or less money than hiring a React.js programmer locally, you may recruit someone with much expertise and a broader technical stack.
React is a very strong framework. React.js makes use of a powerful synchronization method known as Virtual DOM, which compares the current page architecture to the expected page architecture and updates the appropriate components as long as the user input.
React is scalable. it utilises a single language, For server-client side, and mobile platform.
React is steady.React.js is completely adaptable, which means it seldom, if ever, updates the user interface. This enables legacy projects to be updated to the most new edition of React.js without having to change the codebase or make a few small changes.
React is adaptable. It can be conveniently paired with various state administrators (e.g., Redux, Flux, Alt or Reflux) and can be used to implement a number of architectural patterns.
Is there a market for React.js programmers?
The need for React.js developers is rising at an unparalleled rate. React.js is currently used by over one million websites around the world. React is used by Fortune 400+ businesses and popular companies such as Facebook, Twitter, Glassdoor and Cloudflare.
As you’ve seen, locating and Hire React js Developer and Hire React Native developer is a difficult challenge. You will have less challenges selecting the correct fit for your projects if you identify growing offshore locations (e.g. India) and take into consideration the details above.
If you want to make this process easier, You can visit our website for more, or else to write a email, we’ll help you to finding top rated React.js and React Native developers easier and with strives to create this operation
#hire-react-js-developer #hire-react-native-developer #react #react-native #react-js #hire-react-js-programmer