4. Four ways to style react components – codeburst

  • All depend on your personal preferences and the specific complexity of your application.If you want to add just a few style properties, then inline styling is the best option.When you want to reuse your style properties in the same file then style-component are perfect.When your application is more complex I…
  • Instead they are specified with an object whose key is the camelCased version of the style name, and whose value is the style’s value, usually a string.We can create a variable that stores style properties and then pass it to the element like style={nameOfvariable}We can also pass the styling directly…
  • CSS ModulesA CSS Module is a CSS file in which all class names and animation names are scoped locally by default.
  • Great article about css modules here.Similar to css we import css file import styles ‘.
  • Styled-components 💅Styled-components is a library for React and React Native that allows you to use component-level styles in your application that are written with a mixture of JavaScript and CSSFirst we need to install styled-components librarynpm install styled-components –saveNow we can create a variable by selecting a particular html element…

There are four different options to style React components. All depend on your personal preferences and the specific complexity of your application. In React, inline styles are not specified as a…
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Number Flipping Effect With ReactJS

Number Flipping Effect With ReactJS

  • In this tutorial, we’re going to use the excellent React Animated Number library to program a currency display component that changes color based on value.
  • You can check out an example with our production all at Cryptodamus – – If you enjoyed this tutorial, make sure to subscribe to our Youtube Channel and follow us on Twitter @pentacodevids for latest updates!

In this tutorial, we’re going to use the excellent React Animated Number library to program a currency display component that changes color based on value. You
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Controlled Forms in React – Byte-sized React – Medium

Controlled Forms in React  #tech #webdevelopment #programming #javascript #react #reactjs

  • Defining a form’s input value via state is considered a controlled component.For controlled inputs you will need a corresponding state and then a class method to update that state with changes.Let’s walk through a quick example with CodePen.
  • If you don’t know how to set up CodePen with React, you can check out this story.Let’s also add Boostrap 4 to our CodePen so our forms aren’t so plain.Add this to your JS file:class App extends React.Component { constructor(props) { super(props); } render() { return ( div className=”form-group container” labelControlled Form Input/label input type=”text” className=”form-control” aria-describedby=”emailHelp” placeholder=”Update input here” / large className=”form-text text-muted” Form Output /large /div ); }}ReactDOM.render( App /, your CodePen should look like this:Right now our form input is not controlled- meaning that the value of the form input is not determined by the state.
  • Let’s add a state value for the form making it a controlled form.Declare the state value in your constructor.constructor(props) { super(props); this.state({input: ”}); }Then let’s pass the state input value down to the value of the email form and as the value of our output text.input type=”text” className=”form-control” aria-describedby=”emailHelp” placeholder=”Update input here” value={this.state.input}/ large className=”form-text text-muted” {this.state.input} /largeNow notice how the value of the form reflects the state, but the form value doesn’t update.
  • Let’s add a method to update state, and pass it down using the onChange event handler.Add the method to your constructor.constructor(props) { super(props); this.state = ({input: ”}); this.formUpdate = define the formUpdate method.formUpdate(event) { this.setState({input: event.target.value});}The formUpdate function needs to be called whenever a change is made to the form input.
  • Use the onChange react event to trigger the formUpdate method.input type=”text” className=”form-control” aria-describedby=”emailHelp” placeholder=”Update input here” value={this.state.input} time a change happens to the form the formUpdate method will be called with the event object.

Form input values can be set to state values and then updated via React events. Defining a form’s input value via state is considered a controlled component. For controlled inputs you will need a…
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JavaScript: The beauty of arrow functions – LeanJS – Medium

JavaScript: The beauty of arrow functions  #react #arrowfunctions #es6 #javascript #reactjs

  • JavaScript: The beauty of arrow functionsArrow functions are an awesome ES6 language feature for a number of reasons, but we believe there are 3 key reasons they really shine:They are more conciseThey allow for implicit returnsThey get their “this” value from the context, meaning it comes from the callerLet’s look at some ES5 vs ES6 code:In the above code example we compare the ES5 and ES6 way of grabbing some values from an array of objects.More ConciseThe most striking thing is the amount of code, less code means less probability of introducing errors.
  • Secondly it’s obvious that our arrow function has improved readability here, it’s also more declarative.
  • Being concise and declarative with code is especially important when working in teams, it saves time and improves outcomes.Implicit returnsThe ability to return values implicitly builds upon the first point, we no longer need to add extra syntax such as the {} and return keyword if they are not needed.
  • So context is simply the one who is calling the function.If this isn’t clear, have a play with the code yourself here: why is getting the “this” value from the context useful?Before we had to bind our functions explicitly to make sure they had the right “this” value:We can of course continue doing this, but now we have a more concise way of doing the same thing:Summing upUsing arrow functions allows us to use a more concise and declarative syntax while eliminating the need for us to bind them explicitly.
  • There are of course a few more things to know about arrow functions which are beyond the scope of this post.

Arrow functions are an awesome ES6 language feature for a number of reasons, but we believe there are 3 key reasons they really shine: In the above code example we compare the ES5 and ES6 way of…
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Array Methods Explained : Filter vs Map vs Reduce vs Foreach

  • we all know why this method is used for and even you don’t know about this method the name pretty much explains everything.Foreach takes a callback function and run that callback function on each element of array one by one.var sample = [1, 2, 3];// es5sample.forEach(function (elem, index){ console.log(elem + ‘ comes at ‘ + index);})// es6sample.forEach((elem, index) = `${elem} comes at ${index}`)/*output1 comes at 02 comes at 13 comes at 2*/For every element on the array we are calling a callback which gets element its index provided by foreach.Basically forEach works as a traditional for loop looping over the array and providing you array elements to do operations on them.okay!
  • If the value is true element remains in the resulting array but if the return value is false the element will be removed for the resulting array.var sample = [1, 2, 3] // yeah same array// es5var result = sample.filter(function(elem){ return elem !
  • As a ReactJS developer I use map a lot inside my application UI.Map like filter foreach takes a callback and run it against every element on the array but whats makes it unique is it generate a new array based on your existing array.Let’s understand map with an examplevar sample = [1, 2, 3] // i am never gonna change Boo!
  • Yeah// es5var mapped = sample.map(function(elem) { return elem * 10;})// es6let mapped = sample.map(elem = elem * 10)console.log(mapped);/* output */[10, 20, 30]Map ran through every element of the array, multiplied it to 10 and returned the element which will be going to store inside our resulting array.Like filter, map also returns an array.
  • ReduceAs the name already suggest reduce method of the array object is used to reduce the array to one single value.For example if you have to add all the elements of an array you can do something like this.var sample = [1, 2, 3] // here we meet again// es5var sum = sample.reduce(function(sum, elem){ return sum + elem;})// es6var sum = sample.reduce((sum, elem) = sum + elem)console.log(sum)reduce takes a callback ( like every function we talked about ).

Okay so yeah we know they are different they have different purpose and goals still we don’t bother to understand them. We use arrays. A lot of arrays. We use arrays to show search lists, items added…
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Why React is more popular now a days?

Why #Reactjs is more popular now a days?

   #Javascript  #webdev  #WebApp

  • Well, React’s fast-paced performance and easy learning played a crucial role in highlighting and well-liked javascript among other several of available Javascript.
  • Some stunning features expect its typical attributes has enabled React to win the race rapidly and steadily.
  • Below in the first graph, you can see the popularity raised within the last two years which is acceptable due to the tremendous support of the React with the application development which we have already discussed.
  • Now coming to the second graph as you can see the another Javascript liked and most preferred by the developers i.e AngularJS compared with the React.
  • Techuz Infoweb has sowed the seeds of becoming top notch React js app Development Company and we have started to kick the market with the highly accepted React and React Native framework to develop applications that applaud and acquired by a large number of users.

React is best open-source JavaScript library and nowadays more popular. Many sites built with Reactjs development like Asana, Facebook, Netflix, PayPal, Tesla.
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Inline Form in HTML Table with React – Hajime Terasawa – Medium

  • Base Formimport React, { Component } from ‘react’;import PropTypes from ‘prop-types’;export default class BaseForm extends Component { constructor(props) { super(props); this.handleChange = this.handleChange.bind(this); this.handleSubmit = this.handleSubmit.bind(this); } // this.props.model.attrs を 初期state として持つ componentWillMount(){ const model = this.props.model; Object.keys(model).
  • map((attr) = { let initState = {}; initState[attr] = model[attr]; this.setState(initState); }); } // handleChange(name, e) { let newState = {}; newState[name] = e.target.value; this.setState(newState); } handleSubmit(e) { e.preventDefault(); } render() { const newChildren = React.Children.map( this.props.children, (child) = { switch (typeof child) { // case ‘string’: return child; // React要素だった場合は 初期値とcb を渡す case ‘object’: const newProps = { onChange: this.handleChange, value: this.state ?
  • this.state[child.props.name] || : }; return ( div / {React.cloneElement(child, newProps)} /div ); default: return null; } }); return ( form onSubmit={this.handleSubmit} { newChildren } button type=”submit” className=”btn btn-primary”Submit/button /form ); }}BaseForm.propTypes = { model: PropTypes.object, onSubmit: PropTypes.func}Table Inline Formimport React, { Component } from ‘react’;import PropTypes from ‘prop-types’;export default class TableInlineForm extends Component { constructor(props) { super(props); this.handleChange = this.handleChange.bind(this); this.handleSubmit = this.handleSubmit.bind(this); } // this.props.model.attrs を 初期state として持つ componentWillMount(){ const model = this.props.model; Object.keys(model).
  • map((attr) = { let initState = {}; initState[attr] = model[attr]; this.setState(initState); }); } // handleChange(name, e) { let newState = {}; newState[name] = e.target.value; this.setState(newState); } handleSubmit(e) { e.preventDefault(); } render() { const newChildren = React.Children.map( this.props.children, (child) = { switch (typeof child) { // case ‘string’: return child; // React要素だった場合は 初期値とcb を渡す case ‘object’: const newProps = { form: `form${this.props.formId}`, onChange: this.handleChange, value: this.state ?
  • this.state[child.props.name] || : }; return ( td {React.cloneElement(child, newProps)} /td ); default: return null; } }); return ( tr tdform onSubmit={this.handleSubmit} {this.props.model.id}/form/td { newChildren } tdbutton type=’submit’ className=’btn btn-primary’Submit/button/td /tr ); }}TableInlineForm.propTypes = { formId: PropTypes.string, model: PropTypes.object, onSubmit: PropTypes.func}変更があったのは render() メソッドのみ。本来 table 下に form を置くことは出来ないが、HTML5 の form attribute を props として input に付与することで実現できた。BaseForm 自体の実装はこれを参考にしている。React を書いていると生の HTML(実際には JSX ) を書く機会が増えるので、なんというか Web ページを作っている感があって楽しい。なにより component

現在 react の勉強がてら、昔作った rails アプリのSPR化を行っている。. “Inline Form in HTML Table with React” is published by Hajime Terasawa
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