React routerで表示を切り替える（Navで選択した内容をメインエリアに表示する）

PHOTO

Sun May 16 2021 08:59:25 GMT+0000 (Coordinated Universal Time)

react-routerの使いかたを学ぶ。
参考にしたサイトはhttps://dezanari.com/react-react-router/

1. まず、react-create-appで土台を作成。

2. react-router-domをインストール（react-create-appだといらない？！）
```
yarn add react-router-dom
```
3. 
（例えば）App.jsで、
import { BrowserRouter, Route, Link, Switch } from 'react-router-dom'; 
と、インポートしておいて、

Linkで飛ぶ先はコンポーネントとして作成し、このファイルにインポートする。
import PageA from '../PageA/PageA';
import PageB from '../PageB/PageB';

そして、切り替えを以下のように設定。

```
<BrowserRouter>　　　　　　　　　/* 全体をBrowserRouterで囲む。*/

    <div className="wrapper">　

      <div className="nav">　　　　　　　　　　　　　
        <h1>Do you like A or B???</h1>
        <Link to="/pageA">PageA</Link><br/>　　/*Linkでアンカーと同じものを作れる。*/
        <Link to="/pageB">PageB</Link>
      </div>
    
      <div className="main">
        <Switch>　　　　　　　　　　　　　　　　　　　　/* Switchで囲んだ中には、、、*/
          <Route path="/pageA" component={PageA}/>　 /* RouteでLinkで飛ぶ先を設定。*/
          <Route path="/pageB" component={PageB}/>  
        </Switch>    
      </div>
    
    </div>

    </BrowserRouter>
```

COPY

ECサイトやブログなどに使える！ナビゲーションは残しつつ、メインエリアの表示を切り替える方法。

参考にしたサイトはhttps://dezanari.com/react-react-router/

Save snippets that work from anywhere online with our extensions

Comments

React

@misho

React routerで表示を切り替える（Navで選択した内容をメインエリアに表示する）

#html #javascript #nodejs

How to Save HTML Form Data in JSON - Express

<form action="/new" method="post">
 
  <input name="title" type="text">
  <input name="description" type="text">
  <button type="submit">Submit Form</button>
 
</form>

> More steps

#javascript

Get URL and URL Parts in JavaScript

var newURL = window.location.protocol + "//" + window.location.host + "/" + window.location.pathname + window.location.search

#javascript

Add event listener to multiple buttons with the same class

    btns = document.getElementsByClassName("saveBtn");
    for (var i = 0; i < btns.length; i++) {
        btns[i].addEventListener("click", function () {
			//Add function here
        });
    }

#javascript

Replace Textarea with Codemirror editor

<link rel="stylesheet" type="text/css" href="plugin/codemirror/lib/codemirror.css">

<body>
	<textarea class="codemirror-textarea"></textarea>
</body>

<script>

$(document).ready(function(){
    var codeText = $(".codemirror-textarea")[0];
    var editor = CodeMirror.fromTextArea(codeText, {
        lineNumbers : true
    });
});

</script>

<script type="text/javascript" src="plugin/codemirror/lib/codemirror.js"></script>

#javascript #nodejs #commandline

HTTPS Redirect in Nodejs

npm install heroku-ssl-redirect

> More steps

#react.js #redux

Check if token expires and logout user

const [ user, setUser ] = useState(JSON.parse(localStorage.getItem('profile'))); //convert to object

const logout = () =>{
        dispatch({type: 'LOGOUT'});
        history.push("/");
        setUser(null);
    }

    useEffect(()=>{
        const token = user?.token;

        //JWT check if token expired
        if(token){
            const decodedToken = decode(token)
            if(decodedToken.exp*1000 < newDate().getTime()) logout();
        }
        setUser(JSON.parse(localStorage.getItem('profile')))
    },[location])

#javascript #nodejs

Save to MongoDB without Duplicates Using Mongoose

var mongoose = require('mongoose');
var Schema = mongoose.Schema;

const exampleSchema = new Schema({
    title: { type: String , required: true},
    content: [{type: String}]
});


var Example = mongoose.model('Example', exampleSchema);
module.exports = Example;

> More steps

#html #javascript #jsfunctions #dom #dommanipulation

getAttribute() - how to get the value of any attribute of HTML element

<html>

<input id="contact" name="address">

<script>

    var x = document.getElementById("contact").getAttribute('name');

</script>

</html>

#javascript

Full Stack Developer

function full_stack_developer() {
    full_stack_developer();
}

#javascript

3 Ways To Detect Selenium Bots Using Javascript - CodingTutz

if (navigator.webdriver) {
    document.body.innerHTML = "This is a Bot";
}

#javascript #promises #howto

How to Get the Domain From A URL Using Javascript

var url = "http://scratch99.com/web-development/javascript/";
var urlParts = url.replace('http://','').replace('https://','').split(/[/?#]/);
var domain = urlParts[0];

#javascript #javascript #functions #parameters

Required Parameters for Functions in JavaScript

 const isRequired = () => { throw new Error('param is required'); };

const hello = (name = isRequired()) => { console.log(`hello ${name}`) };

// These will throw errors
hello();
hello(undefined);

// These will not
hello(null);
hello('David');
The idea here is that it uses default parameters, like how the b parameter here has a default if you don’t send it anything:
function multiply(a, b = 1) {
  return a * b;
}

#javascript

Mapping an Object

const object1 = {
  a: 'somestring',
  b: 42
};

for (let [key, value] of Object.entries(object1)) {
  console.log(`${key}: ${value}`);
}

#javascript

Copy Text to Clipboard with Line Breaks

function copyToClipboard(){

    var codeToBeCopied = document.getElementById('code-snippet').innerText;
    var emptyArea = document.createElement('TEXTAREA');
    emptyArea.innerHTML = codeToBeCopied;
    const parentElement = document.getElementById('post-title');
    parentElement.appendChild(emptyArea);

    emptyArea.select();
    document.execCommand('copy');

    parentElement.removeChild(emptyArea);
    M.toast({html: 'Code copied to clipboard'})

    }

#javascript

How to store fetch response in javascript variable - Stack Overflow

async function fun() {
  return fetch('https://jsonplaceholder.typicode.com/todos/1').then(res => res.json());
}

const data  = await fun();

React routerで表示を切り替える（Navで選択した内容をメインエリアに表示する）

Save snippets that work from anywhere online with our extensions

Comments

More like this

React

Browse more snippets >>

React routerで表示を切り替える（Navで選択した内容をメインエリアに表示する）

Save snippets that work from anywhere online with our extensions

Comments

More like this

React

Browse more snippets >>

Embed code snippet