-
Notifications
You must be signed in to change notification settings - Fork 1
/
reactjs.html
786 lines (749 loc) · 39.8 KB
/
reactjs.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<link rel="shortcut icon" href="assets/img/mainlogo.jpg" type="image/x-icon">
<title>Home</title>
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.2.2/dist/css/bootstrap.min.css" rel="stylesheet"
integrity="sha384-Zenh87qX5JnK2Jl0vWa8Ck2rdkQ2Bzep5IDxbcnCeuOxjzrPF/et3URy9Bv1WTRi" crossorigin="anonymous" />
<link rel="stylesheet" href="assets/css/style.css" />
<link rel="stylesheet" href="assets/prismjs/prism.css" />
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.2.2/dist/js/bootstrap.bundle.min.js"
integrity="sha384-OERcA2EqjJCMA+/3y+gxIOqMEjwtxJY7qPCqsdltbNJuaOe923+mo//f6V8Qbsw3"
crossorigin="anonymous"></script>
<link rel="stylesheet" href="myDesigns/assets/bootstrap/css/bootstrap.min.css">
<link rel="stylesheet"
href="https://fonts.googleapis.com/css?family=Source+Sans+Pro:300,400,700,300italic,400italic,700italic">
<link rel="stylesheet" href="myDesigns/assets/fonts/font-awesome.min.css">
<link rel="stylesheet" href="myDesigns/assets/fonts/simple-line-icons.min.css">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap-icons@1.9.1/font/bootstrap-icons.css" />
<style>
.scroll-to-top {
background-color: #f77b50 !important;
text-decoration: none !important;
}
.scroll-to-top:hover {
background: #f77b50 !important;
text-decoration: none !important;
}
footer .scroll-to-top {
text-decoration: none !important;
}
.offcanvas {
width: 700px !important; /* Override the default width */
}
</style>
</head>
<body id="page-top">
<nav class="navbar fixed-top navbar-expand-lg navbar-dark" style="background-color: rgb(1,4,45);">
<div class="container-fluid">
<a class="navbar-brand" href="index.php">
<img src="assets/img/mainlogo.jpg" alt="" style="height: 7vh;"> Cheatbook
</a>
<button class="navbar-toggler" type="button" data-bs-toggle="collapse"
data-bs-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false"
aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav me-auto mb-2 mb-lg-0">
<li class="nav-item">
<a class="nav-link active" aria-current="page" href="index.php">Home</a>
</li>
<!--frontend -->
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" role="button" data-bs-toggle="dropdown"
aria-expanded="false">
Frontend
</a>
<ul class="dropdown-menu multi-column columns-2">
<div class="row">
<div class="col-sm-6">
<ul class="multi-column-dropdown">
<li><a class="dropdown-item" href="html.php">HTML</a></li>
<li><a class="dropdown-item" href="css.php">CSS</a></li>
<li><a class="dropdown-item"
href="javascript.php">JavaScript</a></li>
<li><a class="dropdown-item"
href="typescript.php">TypeScript</a></li>
<li>
<hr class="dropdown-divider" />
</li>
<li class="dropdown-header">JavaScript Frameworks</li>
<li><a class="dropdown-item" href="reactjs.php">Reacjs</a></li>
<li><a class="dropdown-item" href="nextjs.php">Nextjs</a></li>
<li><a class="dropdown-item"
href="angularjs.php">Angularjs</a></li>
<li><a class="dropdown-item" href="remix.php">Remixjs</a></li>
<li><a class="dropdown-item" href="vuejs.php">vuejs</a></li>
</ul>
</div>
<div class="col-sm-6">
<ul class="multi-column-dropdown">
<li><a class="dropdown-item" href="astrojs.php">Astrojs</a></li>
<li><a class="dropdown-item" href="electronjs.php">electronjs</a></li>
<li>
<hr class="dropdown-divider" />
</li>
<li class="dropdown-header">CSS Framework</li>
<li><a class="dropdown-item" href="bootstrap.php">Bootstrap</a></li>
<li><a class="dropdown-item" href="tailwindcss.php">Tailwind css</a></li>
<li><a class="dropdown-item" href="materialui.php">Material UI</a></li>
<li> <hr class="dropdown-divider" /> </li>
<li class="dropdown-header">State Management</li>
<li><a class="dropdown-item" href="redux.php">Redux</a></li>
</ul>
</div>
</div>
</ul>
</li>
<!-- backend -->
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" role="button" data-bs-toggle="dropdown"
aria-expanded="false">
Backend
</a>
<ul class="dropdown-menu multi-column columns-2">
<div class="row">
<div class="col-sm-6">
<ul class="multi-column-dropdown">
<li><a class="dropdown-item" href="django.php">Django</a></li>
<li><a class="dropdown-item" href="flask.php">Flask</a></li>
<li><a class="dropdown-item" href="fastapi.php">Fastapi</a></li>
<li><a class="dropdown-item" href="expressjs.php">Expressjs</a></li>
<li><a class="dropdown-item" href="nodejs.php">Nodejs</a></li>
<li><a class="dropdown-item" href="php.php">PHP</a></li>
<li><a class="dropdown-item" href="golang.php">GO</a></li>
<li><a class="dropdown-item" href="spring.php">Spring</a></li>
<li><a class="dropdown-item"href="springboot.php">Springboot</a></li>
<li> <hr class="dropdown-divider" /></li>
<li class="dropdown-header">Databases</li>
<li><a class="dropdown-item" href="Sql.php">SQL</a></li>
</ul>
</div>
<div class="col-sm-6">
<ul class="multi-column-dropdown">
<li><a class="dropdown-item" href="mysql.php">MySQL</a></li>
<li><a class="dropdown-item" href="mongodb.php">MongoDB</a></li>
<li><a class="dropdown-item" href="firebase.php">Firebase</a></li>
<li><a class="dropdown-item" href="cassandra.php">Cassandra</a></li>
<li><a class="dropdown-item" href="redis.php">Redis</a></li>
<li><a class="dropdown-item" href="postgresql.php">PostgreSQL</a></li>
<li><a class="dropdown-item" href="influxdb.php">infixDB</a></li>
<li> <hr class="dropdown-divider" /> </li>
<li class="dropdown-header">Java technologies</li>
<li><a class="dropdown-item" href="hibernet.php">Hibernet</a></li>
<li><a class="dropdown-item" href="jdbc.php">jdbc</a></li>
<li><a class="dropdown-item" href="servlets.php">servlets</a></li>
</ul>
</div>
</div>
</ul>
</li>
<!-- programming -->
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" role="button" data-bs-toggle="dropdown"
aria-expanded="false">
Programming
</a>
<ul class="dropdown-menu multi-column columns-2">
<div class="row">
<div class="col-sm-6">
<ul class="multi-column-dropdown">
<li><a class="dropdown-item" href="cplus.php">C++</a></li>
<li><a class="dropdown-item" href="c.php">C</a></li>
<li><a class="dropdown-item" href="java.php">Java</a></li>
<li><a class="dropdown-item" href="python.php">Python</a></li>
</ul>
</div>
<div class="col-sm-6">
<ul class="multi-column-dropdown">
<li class="dropdown-header">Data structure</li>
<li><a class="dropdown-item" href="dsa.php">DSA</a></li>
</ul>
</div>
</div>
</ul>
</li>
<!-- databases -->
<li class="nav-item dropdown mx-1">
<a class="nav-link dropdown-toggle" href="#" role="button" data-bs-toggle="dropdown"
aria-expanded="false">
Design
</a>
<ul class="dropdown-menu">
<li><a class="dropdown-item" href="figma.php">Figma</a></li>
<li><a class="dropdown-item" href="adobexd.php">AdobeXD</a></li>
</ul>
</li>
<!-- API & Authentication -->
<li class="nav-item dropdown mx-1">
<a class="nav-link dropdown-toggle" href="#" role="button" data-bs-toggle="dropdown"
aria-expanded="false">
API & Auth
</a>
<ul class="dropdown-menu">
<li><a class="dropdown-item" href="restfulapi.php">RESTful API</a></li>
<li><a class="dropdown-item" href="graphql.php">GraphQL</a></li>
<li><a class="dropdown-item" href="jwtauth.php">JWT Auth</a></li>
<li><a class="dropdown-item" href="apollo.php">Apollo</a></li>
</ul>
</li>
<!-- testing -->
<li class="nav-item dropdown mx-1">
<a class="nav-link dropdown-toggle" href="#" role="button" data-bs-toggle="dropdown"
aria-expanded="false">
Testing
</a>
<ul class="dropdown-menu">
<li><a class="dropdown-item" href="jest.php">Jest</a></li>
</ul>
</li>
<!-- cloud services -->
<li class="nav-item dropdown mx-1">
<a class="nav-link dropdown-toggle" href="#" role="button" data-bs-toggle="dropdown"
aria-expanded="false">
Cloud
</a>
<ul class="dropdown-menu">
<li><a class="dropdown-item" href="aws.php">AWS</a></li>
<li><a class="dropdown-item" href="azure.php">Azure</a></li>
<li><a class="dropdown-item" href="googlecloud.php">Google Cloud</a></li>
<li><a class="dropdown-item" href="cloudflare.php">Cloudflare</a></li>
</ul>
</li>
<!-- Mobile Development-->
<li class="nav-item dropdown mx-1">
<a class="nav-link dropdown-toggle" href="#" role="button" data-bs-toggle="dropdown"
aria-expanded="false">
Mobile Dev
</a>
<ul class="dropdown-menu">
<li><a class="dropdown-item" href="android.php">Android</a></li>
<li><a class="dropdown-item" href="kotlin.php">Kotlin</a></li>
<li><a class="dropdown-item" href="reactnative.php">React Native</a></li>
<li><a class="dropdown-item" href="flutter.php">Flutter</a></li>
</ul>
</li>
<!-- Devops -->
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" role="button" data-bs-toggle="dropdown"
aria-expanded="false">
Devops
</a>
<ul class="dropdown-menu multi-column columns-2">
<div class="row">
<div class="col-sm-6">
<ul class="multi-column-dropdown">
<li class="dropdown-header">CI/CD</li>
<li><a class="dropdown-item" href="docker.php">Docker</a></li>
<li><a class="dropdown-item" href="jenkins.php">jenkins</a></li>
<li><a class="dropdown-item" href="kubernetes.php">kubernetes</a></li>
<li><a class="dropdown-item" href="maven.php">Maven</a></li>
<li><a class="dropdown-item" href="git.php">Git</a> </li>
<li><a class="dropdown-item" href="github_action.php">Github Actions</a></li>
<li><a class="dropdown-item" href="Terraform.php">Terraform</a></li>
<li><a class="dropdown-item" href="ansible.php">Ansible</a></li>
<li><hr class="dropdown-divider" /></li>
<li class="dropdown-header">Web Servers</li>
<li><a class="dropdown-item" href="languages/devops/nginx.php">Nginx</a>
</li>
</ul>
</div>
<div class="col-sm-6">
<ul class="multi-column-dropdown">
<hr class="dropdown-divider" />
</li>
<li class="dropdown-header">Operating System</li>
<li><a class="dropdown-item" href="windows.php">Windows</a>
</li>
<li><a class="dropdown-item" href="linux.php">Linux</a>
</li>
<li><a class="dropdown-item" href="macos.php">Macos</a>
</li>
<li>
<hr class="dropdown-divider" />
</li>
<li class="dropdown-header">Scripting</li>
<li><a class="dropdown-item" href="bashscript.php">Bash Scripting</a>
</li>
<li>
<hr class="dropdown-divider" />
</li>
<li class="dropdown-header">Monitoring</li>
<li><a class="dropdown-item" href="monit.php">Monit</a>
</ul>
</div>
</div>
</ul>
</li>
<li class="nav-item">
<a class="nav-link" href="about.php">About Us</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" role="button" data-bs-toggle="dropdown"
aria-expanded="false">
Tools
</a>
<ul class="dropdown-menu">
<li><a class="dropdown-item" href="tools/shadowpicker/index.html">Shadow Picker</a></li>
<li><a class="dropdown-item" href="tools/readmemaker/index.html">Github Project Readme</a>
</li>
<li><a class="dropdown-item" href="tools/profilereadme/index.html">Github Profile Readme</a>
</li>
<li><a class="dropdown-item" href="tools/gradientcolorpicker.html">Gradient Colour
Picker</a></li>
<li><a class="dropdown-item" href="tools/colourbook/colorpiceker.html">Colour Picker</a>
</li>
<li><a class="dropdown-item" href="tools/codereview/index.html">Simple Code Editor</a> </li>
<li><a class="dropdown-item" href="tools/banner/index.html">Banner Maker</a> </li>
<li><a class="dropdown-item" href="tools/logomaker/index.html">Logo & Favicon Maker</a>
</li>
<li><a class="dropdown-item" href="tools/paraiso-colors-main/index.html">colour plates</a>
</li>
</ul>
</li>
</ul>
<a href="myDesigns/index.html">
<div class="button btn1 mx-1" style="font-size: 1em;">My Designs</div>
</a>
</div>
</div>
</nav> <!-- mid part -->
<nav class="mt-5 p-2 headline" style="background:linear-gradient(to top right, #fb5475 0%, #f77b50 59%);">
<div class="text-center " style="margin-top:5vh;"><img style="margin-right:2vh;" src="../../../assets/img/reactjs-icon.svg" alt="" /> ReactJS cheatsheet
</div>
</nav>
<div class="container">
<div class="p-5 mb-4 bg-light rounded-3 jumbo mt-2">
<div class="container-fluid py-3">
<h1 class="display-5 fw-bold">ReactJS</h1>
<div class="row">
<div class="col-md-6">
<p class="fs-4">
React is a declarative, efficient, and flexible JavaScript library for building user interfaces. It’s ‘V’ in MVC. ReactJS is an open-source, component-based front-end library responsible only for the view layer of the application. It is maintained by
Facebook. <br> React uses a declarative paradigm that makes it easier to reason about your application and aims to be both efficient and flexible.
</div>
<div class="col-md-6">
<img src="../../../assets/img/reactjs-icon.svg" alt="" style="width:100% ;" />
</div>
</div>
<button class="btn btn1" type="button" data-bs-toggle="offcanvas" data-bs-target="#o1" aria-controls="o1">
Read More...
</button>
<div class="offcanvas offcanvas-start" data-bs-scroll="true" tabindex="-1" id="o1" aria-labelledby="offcanvasWithBothOptionsLabel">
<div class="offcanvas-header">
<h5 class="offcanvas-title" id="offcanvasWithBothOptionsLabel">
Reactjs
</h5>
<button type="button" class="btn-close" data-bs-dismiss="offcanvas" aria-label="Close"></button>
</div>
<div class="offcanvas-body">
<p>
Features of React.js: There are unique features are available on React because that it is widely popular.
<br><br>
<ul>
<li>
Use JSX: It is faster than normal JavaScript as it performs optimizations while translating to regular JavaScript. It makes it easier for us to create templates.</li>
<li>
Virtual DOM: Virtual DOM exists which is like a lightweight copy of the actual DOM. So for every object that exists in the original DOM, there is an object for that in React Virtual DOM. It is exactly the same, but it does not have the power to directly
change the layout of the document. Manipulating DOM is slow, but manipulating Virtual DOM is fast as nothing gets drawn on the screen.</li>
<li>
One-way Data Binding: This feature gives you better control over your application.</li>
<li>
Component: A Component is one of the core building blocks of React. In other words, we can say that every application you will develop in React will be made up of pieces called components. Components make the task of building UIs much easier. You can
see a UI broken down into multiple individual pieces called components and work on them independently and merge them all in a parent component which will be your final UI.</li>
<li>
Performance: React.js use JSX, which is faster compared to normal JavaScript and HTML. Virtual DOM is a less time taking procedure to update webpages content.</li>
</ul>
</p>
</div>
</div>
</div>
</div>
<ol>
<!-- offcanvas -->
<li>
Create a new React project (select react option)
<pre class="language-jsx">
<code>
npm create vite
</code>
</pre>
</li>
<li>
download node packages
<pre class="language-jsx">
<code>
npm install
</code>
</pre>
</li>
<li>
Run React project
<pre class="language-jsx">
<code>
npm run dev
</code>
</pre>
</li>
<li>class based component
<pre class="language-jsx">
<code> import React, { Component } from 'react'
export class Contact extends Component {
render() {
return (
<div>Contact</div>
)
}
}
export default Contact
</code>
</pre>
</li>
<li>
fuction based component
<pre class="language-jsx">
<code> import React from 'react'
const Contact = () => {
return (
<div>Contact</div>
)
}
export default Contact
</code>
</pre>
</li>
<li>start reactjs app
<pre class="language-jsx">
<code>
npm start
</code>
</pre>
</li>
<li>
File structure in src folder (use cmd)
<pre class="language-jsx">
<code>
mkdir Utils Assets Components Config Layouts Middleware Pages Routes Services Utils
</code>
</pre>
</li>
<li>
ADD blank many js files
<pre class="language-jsx">
<code>
type NUL > sideBar.js
type NUL > Footer.js
type NUL > header.js
</code>
</pre>
</li>
<li>
import react-router-dom
<pre class="language-jsx">
<code>
npm i react-router-dom
</code>
</pre>
</li>
<li>
import router and routes
<pre class="language-jsx">
<code>
import { BrowserRouter as Router, Routes, Route } from 'react-router-dom';
</code>
</pre>
<pre class="language-jsx">
<code>
<Router>
<Routes>
<Route path="/" element={<Home />}/>
<Route path="" element={<Singlemovie />}/>
<Route path="*" element={<Errorpage />}/>
</Routes>
</Router>
</code>
</pre>
</li>
<li>
create nested routes
<pre class="language-jsx">
<code>
import { BrowserRouter as Router, Routes, Route } from 'react-router-dom';
</code>
</pre>
<pre class="language-jsx">
<code>
<Router>
<Routes>
<Route path="/" element={<Home />}>
<Route path="about" element={<About />} />
<Route path="contact" element={<Contact />} />
<Route path="*" element={<Errorpage />} />
</Route>
</Routes>
</Router>
</code>
</pre>
<p>add outlet in parent route in above ex: home.js</p>
<pre class="language-jsx">
<code>
import { Outlet } from 'react-router-dom'
</code>
</pre>
<pre class="language-jsx">
<code>
<Outlet/>
</code>
</pre>
</li>
<li>create go back button feature
<pre class="language-jsx">
<code>
import { useNavigate } from 'react-router-dom'
</code>
</pre>
<pre class="language-jsx">
<code>
<button onClick={()=>{navigate(-1);}}>Go back</button>
</code>
</pre>
</li>
<li>
for fetch id from link(route)<button class="btn btn1" type="button" data-bs-toggle="offcanvas" data-bs-target="#o3" aria-controls="o3">
Read More...
</button>
<div class="offcanvas offcanvas-start" data-bs-scroll="true" tabindex="-1" id="o3" aria-labelledby="offcanvasWithBothOptionsLabel">
<div class="offcanvas-header">
<h5 class="offcanvas-title" id="offcanvasWithBothOptionsLabel">
useParams();
</h5>
<button type="button" class="btn-close" data-bs-dismiss="offcanvas" aria-label="Close"></button>
</div>
<div class="offcanvas-body">
<p>
According to the definition in React Router doc, useParams returns: an object of key/value pairs of URL parameters. Use it to access match.params of the current route
<br><br>
<ul>
<li>
What does it mean in plain English?</li>
<li>
It means whatever you set up in useParams(ex: title), your params have to match with the < Route path='/path/:title' > .</li>
</ul>
</p>
</div>
</div>
<pre class="language-jsx">
<code>
import { useParams } from 'react-router-dom'
</code>
</pre>
<pre class="language-jsx">
<code>
const { id }=useParams();
</code>
</pre>
</li>
<li>
React useContext Hook<button class="btn btn1" type="button" data-bs-toggle="offcanvas" data-bs-target="#o4" aria-controls="o4">
Read More...
</button>
<div class="offcanvas offcanvas-start" data-bs-scroll="true" tabindex="-1" id="o4" aria-labelledby="offcanvasWithBothOptionsLabel">
<div class="offcanvas-header">
<h5 class="offcanvas-title" id="offcanvasWithBothOptionsLabel">
React useContext Hook
</h5>
<button type="button" class="btn-close" data-bs-dismiss="offcanvas" aria-label="Close"></button>
</div>
<div class="offcanvas-body">
<p>
React Context is a way to manage state globally.
<br> It can be used together with the useState Hook to share state between deeply nested components more easily than with useState alone.
<br><br> Context provides a way to pass data or state through the component tree without having to pass props down manually through each nested component. It is designed to share data that can be considered as global data for
a tree of React components, such as the current authenticated user or theme(e.g. color, paddings, margins, font-sizes).
<br><br> Context API uses Context. Provider and Context. Consumer Components pass down the data but it is very cumbersome to write the long functional code to use this Context API. So useContext hook helps to make the code
more readable, less verbose and removes the need to introduce Consumer Component. The useContext hook is the new addition in React 16.8.
</p>
</div>
</div>
<ol type="i">
<li>Import usecontext
<pre class="language-jsx">
<code>
import React, { useContext } from "react";
</code>
</pre>
</li>
<li>For Create context value
<pre class="language-jsx">
<code>
const AppContext = React.createContext();
</code>
</pre>
</li>
<li>For set provider value
<pre class="language-jsx">
<code>
return <AppContext.Provider value="soham">{children}</AppContext.Provider>
</code>
</pre>
</li>
<li>For access value
<pre class="language-jsx">
<code>
const auth = useContext(AuthContext);
</code>
</pre>
</li>
<li>add appprovider in index.js
<pre class="language-jsx">
<code>
<AppProvider> </AppProvider>
</code>
</pre>
</li>
</ol>
</li>
<li>create props
<pre class="language-jsx">
<code>
function Avatar(props) {
let person = props.person;
let size = props.size;
// ...
}
</code>
</pre>
<pre class="language-jsx">
<code>
function Avatar({ person, size }) {
// ...
}
</code>
</pre>
</li>
<li> useState is a React Hook that lets you add a state variable to your component.
<pre class="language-jsx">
<code>
const [state, setState] = useState(initialState)
</code>
</pre>
</li>
<li> Enable dark mode (create onClick toogle fuction in buuton and mode input to style)
<pre class="language-jsx">
<code>
const [statebtn, setbtn] = useState("Enable dark mode");
const [mode, setMode] = useState({
color: "black",
backcolor: "white",
});
const toogle = () => {
if (mode.color === "black") {
setMode({
color: "white",
backgroundColor: "black",
});
setbtn("Enable light mode");
} else {
setMode({
color: "black",
backgroundColor: "white",
});
setbtn("Enable dark mode");
}
};
</code>
</pre>
</li>
</ol>
</div>
</div>
<!-- Footer -->
<footer class="text-lg-start bg-dark text-muted footer-dark mt-5" style="background-color: rgb(1,4,45) !important;">
<!-- Section: Social media -->
<section class="d-flex justify-content-lg-between p-4 border-bottom" style="color: white">
<!-- Left -->
<div class="me-5 d-none d-lg-block" style="font-size: 1.7em;">
<span>Get connected with us on social networks:</span>
</div>
<!-- Left -->
<!-- Right -->
<div>
<!-- Facebook -->
<a class="btn text-white btn-floating m-1" style="background-color: #3b5998" href="#!" role="button"><i
class="bi bi-facebook"></i></a>
<!-- Twitter -->
<a class="btn text-white btn-floating m-1" style="background-color: #55acee" href="#!" role="button"><i
class="bi bi-twitter"></i></a>
<!-- Google -->
<a class="btn text-white btn-floating m-1" style="background-color: #dd4b39" href="#!" role="button"><i
class="bi bi-google"></i></a>
<!-- Instagram -->
<a class="btn text-white btn-floating m-1" style="background-color: #ac2bac" href="#!" role="button"><i
class="bi bi-instagram"></i></a>
<!-- Linkedin -->
<a class="btn text-white btn-floating m-1" style="background-color: #0082ca"
href="https://www.linkedin.com/in/mr-soham-manjrekar/" role="button"><i
class="bi bi-linkedin"></i></a>
<!-- Github -->
<a class="btn text-white btn-floating m-1" style="background-color: #333333"
href="https://github.com/sohammanjrekar" role="button"><i class="bi bi-github"></i></a>
</div>
<!-- Right -->
</section>
<!-- Section: Social media -->
<!-- Section: Links -->
<section class="links" style="color: white">
<div class="container text-md-start mt-5">
<!-- Grid row -->
<div class="row mt-3">
<!-- Grid column -->
<div class="col-md-8 col-lg-8 col-xl-8 mx-auto mb-4">
<!-- Content -->
<h2 class="text-uppercase fw-bold mb-4">
<i class="bi bi-gem me-3"></i>Cheatbook
</h2>
<p>
<li>Quick reference</li>
<li>Be productive after learning a new thing
</li>
<li>Quickly recall when forget some syntax</li>
<li>Use snippets for rapid development</li>
</p>
</div>
<!-- Grid column -->
<div class="col-md-4 col-lg-4 col-xl-4 mx-auto mb-md-0 mb-4" style="font-size: 1.3em;">
<!-- Links -->
<h2 class="text-uppercase fw-bold mb-4">Contact</h2>
<p><i class="bi bi-house-door me-3"></i>Badlapur,mumbai</p>
<p><i class="bi bi-envelope me-3"></i> mrsohammanjrekar@gmail.com</p>
<p><i class="bi bi-phone me-3"></i> +91 7045208474</p>
<p><i class="bi bi-whatsapp me-3"></i> +91 7045208474</p>
</div>
<!-- Grid column -->
</div>
<!-- Grid row -->
</div>
</section>
<!-- Section: Links -->
<!-- Copyright -->
<div class="text-center p-4" style="background-color: rgba(0, 0, 0, 0.05);color:white;word-spacing: 3px;">
© 2022 Copyright:
<a class="text-reset fw-bold" href="https://github.com/sohammanjrekar">cheatbook.com</a> created by Soham
Manjrekar
</div>
<!-- Copyright -->
<a class="js-scroll-trigger scroll-to-top rounded" href="#page-top"><i class="fa fa-angle-up"></i></a>
</footer>
<!-- Footer -->
<!-- Footer -->
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js" type="text/javascript"></script>
<script src="../../myDesigns/assets/js/jquery.min.js"></script>
<script src="../../myDesigns/assets/bootstrap/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-easing/1.4.1/jquery.easing.min.js"></script>
<script src="../../myDesigns/assets/js/stylish-portfolio.js"></script>
<script src="assets/prismjs/prism.js"></script>
</body>
</html>