-
Notifications
You must be signed in to change notification settings - Fork 48
/
from-javascript-to-r.html
363 lines (323 loc) · 23.6 KB
/
from-javascript-to-r.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
<!DOCTYPE html>
<html lang="" xml:lang="">
<head>
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<title>From JavaScript to R | JavaScript for R</title>
<meta name="description" content="Invite JavaScript into your Data Science workflow." />
<meta name="generator" content="bookdown 0.19 and GitBook 2.6.7" />
<meta property="og:title" content="From JavaScript to R | JavaScript for R" />
<meta property="og:type" content="book" />
<meta property="og:description" content="Invite JavaScript into your Data Science workflow." />
<meta name="github-repo" content="yihui/bookdown-crc" />
<meta name="twitter:card" content="summary" />
<meta name="twitter:title" content="From JavaScript to R | JavaScript for R" />
<meta name="twitter:description" content="Invite JavaScript into your Data Science workflow." />
<meta name="author" content="John Coene" />
<meta name="date" content="2020-06-06" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<meta name="apple-mobile-web-app-capable" content="yes" />
<meta name="apple-mobile-web-app-status-bar-style" content="black" />
<link rel="prev" href="from-r-to-javascript.html"/>
<link rel="next" href="a-realistic-approach.html"/>
<script src="libs/header-attrs/header-attrs.js"></script>
<script src="libs/jquery/jquery.min.js"></script>
<link href="libs/gitbook/css/style.css" rel="stylesheet" />
<link href="libs/gitbook/css/plugin-table.css" rel="stylesheet" />
<link href="libs/gitbook/css/plugin-bookdown.css" rel="stylesheet" />
<link href="libs/gitbook/css/plugin-highlight.css" rel="stylesheet" />
<link href="libs/gitbook/css/plugin-search.css" rel="stylesheet" />
<link href="libs/gitbook/css/plugin-fontsettings.css" rel="stylesheet" />
<link href="libs/gitbook/css/plugin-clipboard.css" rel="stylesheet" />
<script src="libs/htmlwidgets/htmlwidgets.js"></script>
<script src="libs/plotly-binding/plotly.js"></script>
<script src="libs/typedarray/typedarray.min.js"></script>
<link href="libs/crosstalk/css/crosstalk.css" rel="stylesheet" />
<script src="libs/crosstalk/js/crosstalk.min.js"></script>
<link href="libs/plotly-htmlwidgets-css/plotly-htmlwidgets.css" rel="stylesheet" />
<script src="libs/plotly-main/plotly-latest.min.js"></script>
<script src="libs/core-js/shim.min.js"></script>
<script src="libs/react/react.min.js"></script>
<script src="libs/react/react-dom.min.js"></script>
<script src="libs/reactwidget/react-tools.js"></script>
<script src="libs/reactable-binding/reactable.js"></script>
<script src="libs/r2d3-render/r2d3-render.js"></script>
<script src="libs/webcomponents/webcomponents.js"></script>
<script src="libs/r2d3-binding/r2d3.js"></script>
<script src="libs/d3v5/d3.min.js"></script>
<style type="text/css">
pre > code.sourceCode { white-space: pre; position: relative; }
pre > code.sourceCode > span { display: inline-block; line-height: 1.25; }
pre > code.sourceCode > span:empty { height: 1.2em; }
code.sourceCode > span { color: inherit; text-decoration: inherit; }
pre.sourceCode { margin: 0; }
@media screen {
div.sourceCode { overflow: auto; }
}
@media print {
pre > code.sourceCode { white-space: pre-wrap; }
pre > code.sourceCode > span { text-indent: -5em; padding-left: 5em; }
}
pre.numberSource code
{ counter-reset: source-line 0; }
pre.numberSource code > span
{ position: relative; left: -4em; counter-increment: source-line; }
pre.numberSource code > span > a:first-child::before
{ content: counter(source-line);
position: relative; left: -1em; text-align: right; vertical-align: baseline;
border: none; display: inline-block;
-webkit-touch-callout: none; -webkit-user-select: none;
-khtml-user-select: none; -moz-user-select: none;
-ms-user-select: none; user-select: none;
padding: 0 4px; width: 4em;
color: #aaaaaa;
}
pre.numberSource { margin-left: 3em; border-left: 1px solid #aaaaaa; padding-left: 4px; }
div.sourceCode
{ }
@media screen {
pre > code.sourceCode > span > a:first-child::before { text-decoration: underline; }
}
code span.al { color: #ff0000; font-weight: bold; } /* Alert */
code span.an { color: #60a0b0; font-weight: bold; font-style: italic; } /* Annotation */
code span.at { color: #7d9029; } /* Attribute */
code span.bn { color: #40a070; } /* BaseN */
code span.bu { } /* BuiltIn */
code span.cf { color: #007020; font-weight: bold; } /* ControlFlow */
code span.ch { color: #4070a0; } /* Char */
code span.cn { color: #880000; } /* Constant */
code span.co { color: #60a0b0; font-style: italic; } /* Comment */
code span.cv { color: #60a0b0; font-weight: bold; font-style: italic; } /* CommentVar */
code span.do { color: #ba2121; font-style: italic; } /* Documentation */
code span.dt { color: #902000; } /* DataType */
code span.dv { color: #40a070; } /* DecVal */
code span.er { color: #ff0000; font-weight: bold; } /* Error */
code span.ex { } /* Extension */
code span.fl { color: #40a070; } /* Float */
code span.fu { color: #06287e; } /* Function */
code span.im { } /* Import */
code span.in { color: #60a0b0; font-weight: bold; font-style: italic; } /* Information */
code span.kw { color: #007020; font-weight: bold; } /* Keyword */
code span.op { color: #666666; } /* Operator */
code span.ot { color: #007020; } /* Other */
code span.pp { color: #bc7a00; } /* Preprocessor */
code span.sc { color: #4070a0; } /* SpecialChar */
code span.ss { color: #bb6688; } /* SpecialString */
code span.st { color: #4070a0; } /* String */
code span.va { color: #19177c; } /* Variable */
code span.vs { color: #4070a0; } /* VerbatimString */
code span.wa { color: #60a0b0; font-weight: bold; font-style: italic; } /* Warning */
</style>
<link rel="stylesheet" href="css/style.css" type="text/css" />
</head>
<body>
<div class="book without-animation with-summary font-size-2 font-family-1" data-basepath=".">
<div class="book-summary">
<nav role="navigation">
<ul class="summary">
<li><a href="./">R and JavaScript</a></li>
<li class="divider"></li>
<li class="chapter" data-level="" data-path="index.html"><a href="index.html"><i class="fa fa-check"></i>Preface</a>
<ul>
<li class="chapter" data-level="" data-path="index.html"><a href="index.html#disclaimer"><i class="fa fa-check"></i>Disclaimer</a></li>
</ul></li>
<li class="part"><span><b>I Basics & Roadmap</b></span></li>
<li class="chapter" data-level="1" data-path="introduction.html"><a href="introduction.html"><i class="fa fa-check"></i><b>1</b> Introduction</a>
<ul>
<li class="chapter" data-level="" data-path="introduction.html"><a href="introduction.html#rationale"><i class="fa fa-check"></i>Rationale</a></li>
<li class="chapter" data-level="" data-path="introduction.html"><a href="introduction.html#prerequisites"><i class="fa fa-check"></i>Prerequisites</a>
<ul>
<li class="chapter" data-level="" data-path="introduction.html"><a href="introduction.html#package-development"><i class="fa fa-check"></i>Package Development</a></li>
<li class="chapter" data-level="" data-path="introduction.html"><a href="introduction.html#json"><i class="fa fa-check"></i>JSON</a></li>
<li class="chapter" data-level="" data-path="introduction.html"><a href="introduction.html#javascript"><i class="fa fa-check"></i>JavaScript</a></li>
</ul></li>
<li class="chapter" data-level="" data-path="introduction.html"><a href="introduction.html#methods"><i class="fa fa-check"></i>Methods</a>
<ul>
<li class="chapter" data-level="" data-path="introduction.html"><a href="introduction.html#v8"><i class="fa fa-check"></i>V8</a></li>
<li class="chapter" data-level="" data-path="introduction.html"><a href="introduction.html#htmlwidgets"><i class="fa fa-check"></i>htmlwidgets</a></li>
<li class="chapter" data-level="" data-path="introduction.html"><a href="introduction.html#shiny"><i class="fa fa-check"></i>Shiny</a></li>
<li class="chapter" data-level="" data-path="introduction.html"><a href="introduction.html#reactr"><i class="fa fa-check"></i>reactR</a></li>
<li class="chapter" data-level="" data-path="introduction.html"><a href="introduction.html#bubble"><i class="fa fa-check"></i>bubble</a></li>
<li class="chapter" data-level="" data-path="introduction.html"><a href="introduction.html#r2d3"><i class="fa fa-check"></i>r2d3</a></li>
</ul></li>
</ul></li>
<li class="part"><span><b>II JavaScript for Computations</b></span></li>
<li class="chapter" data-level="2" data-path="the-v8-engine.html"><a href="the-v8-engine.html"><i class="fa fa-check"></i><b>2</b> The V8 Engine</a>
<ul>
<li class="chapter" data-level="" data-path="the-v8-engine.html"><a href="the-v8-engine.html#installation"><i class="fa fa-check"></i>Installation</a></li>
<li class="chapter" data-level="" data-path="the-v8-engine.html"><a href="the-v8-engine.html#basics"><i class="fa fa-check"></i>Basics</a></li>
<li class="chapter" data-level="" data-path="the-v8-engine.html"><a href="the-v8-engine.html#external-libraries"><i class="fa fa-check"></i>External Libraries</a></li>
<li class="chapter" data-level="" data-path="the-v8-engine.html"><a href="the-v8-engine.html#with-npm"><i class="fa fa-check"></i>With Npm</a></li>
<li class="chapter" data-level="" data-path="the-v8-engine.html"><a href="the-v8-engine.html#use-in-packages"><i class="fa fa-check"></i>Use in Packages</a></li>
</ul></li>
<li class="chapter" data-level="3" data-path="node.html"><a href="node.html"><i class="fa fa-check"></i><b>3</b> Node.js with Bubble</a>
<ul>
<li class="chapter" data-level="" data-path="node.html"><a href="node.html#basics-1"><i class="fa fa-check"></i>Basics</a></li>
<li class="chapter" data-level="" data-path="node.html"><a href="node.html#r-markdown-engine"><i class="fa fa-check"></i>R Markdown Engine</a></li>
<li class="chapter" data-level="" data-path="node.html"><a href="node.html#npm"><i class="fa fa-check"></i>Npm</a></li>
<li class="chapter" data-level="" data-path="node.html"><a href="node.html#use-in-packages-1"><i class="fa fa-check"></i>Use in Packages</a></li>
</ul></li>
<li class="part"><span><b>III Web Development with Shiny</b></span></li>
<li class="chapter" data-level="4" data-path="get-started.html"><a href="get-started.html"><i class="fa fa-check"></i><b>4</b> Get Started</a>
<ul>
<li class="chapter" data-level="" data-path="get-started.html"><a href="get-started.html#static-files"><i class="fa fa-check"></i>Static Files</a></li>
</ul></li>
<li class="chapter" data-level="" data-path="a-first-look.html"><a href="a-first-look.html"><i class="fa fa-check"></i>A First Look</a></li>
<li class="chapter" data-level="" data-path="from-r-to-javascript.html"><a href="from-r-to-javascript.html"><i class="fa fa-check"></i>From R to JavaScript</a></li>
<li class="chapter" data-level="" data-path="from-javascript-to-r.html"><a href="from-javascript-to-r.html"><i class="fa fa-check"></i>From JavaScript to R</a></li>
<li class="chapter" data-level="" data-path="a-realistic-approach.html"><a href="a-realistic-approach.html"><i class="fa fa-check"></i>A Realistic Approach</a>
<ul>
<li class="chapter" data-level="" data-path="a-realistic-approach.html"><a href="a-realistic-approach.html#serialisation"><i class="fa fa-check"></i>Serialisation</a></li>
<li class="chapter" data-level="" data-path="a-realistic-approach.html"><a href="a-realistic-approach.html#events-callbacks"><i class="fa fa-check"></i>Events & Callbacks</a></li>
<li class="chapter" data-level="" data-path="a-realistic-approach.html"><a href="a-realistic-approach.html#as-a-package"><i class="fa fa-check"></i>As a Package</a>
<ul>
<li class="chapter" data-level="" data-path="a-realistic-approach.html"><a href="a-realistic-approach.html#dependencies"><i class="fa fa-check"></i>Dependencies</a></li>
<li class="chapter" data-level="" data-path="a-realistic-approach.html"><a href="a-realistic-approach.html#r-code"><i class="fa fa-check"></i>R Code</a></li>
<li class="chapter" data-level="" data-path="a-realistic-approach.html"><a href="a-realistic-approach.html#javascript-code"><i class="fa fa-check"></i>JavaScript Code</a></li>
<li class="chapter" data-level="" data-path="a-realistic-approach.html"><a href="a-realistic-approach.html#wrapping-up"><i class="fa fa-check"></i>Wrapping up</a></li>
</ul></li>
<li class="chapter" data-level="" data-path="a-realistic-approach.html"><a href="a-realistic-approach.html#exercises"><i class="fa fa-check"></i>Exercises</a></li>
</ul></li>
<li class="part"><span><b>IV HTML Widgets Visualisation</b></span></li>
<li class="chapter" data-level="5" data-path="your-first-widget.html"><a href="your-first-widget.html"><i class="fa fa-check"></i><b>5</b> Your First Widget</a>
<ul>
<li class="chapter" data-level="" data-path="your-first-widget.html"><a href="your-first-widget.html#candidate-libraries"><i class="fa fa-check"></i>Candidate Libraries</a>
<ul>
<li class="chapter" data-level="" data-path="your-first-widget.html"><a href="your-first-widget.html#plotly"><i class="fa fa-check"></i>Plotly</a></li>
<li class="chapter" data-level="" data-path="your-first-widget.html"><a href="your-first-widget.html#highchart.js"><i class="fa fa-check"></i>Highchart.js</a></li>
<li class="chapter" data-level="" data-path="your-first-widget.html"><a href="your-first-widget.html#chart.js"><i class="fa fa-check"></i>Chart.js</a></li>
</ul></li>
<li class="chapter" data-level="" data-path="your-first-widget.html"><a href="your-first-widget.html#how-it-works"><i class="fa fa-check"></i>How it works</a></li>
<li class="chapter" data-level="" data-path="your-first-widget.html"><a href="your-first-widget.html#the-scaffold"><i class="fa fa-check"></i>The Scaffold</a></li>
<li class="chapter" data-level="" data-path="your-first-widget.html"><a href="your-first-widget.html#the-output"><i class="fa fa-check"></i>The Output</a></li>
</ul></li>
<li class="chapter" data-level="6" data-path="a-realistic-widget.html"><a href="a-realistic-widget.html"><i class="fa fa-check"></i><b>6</b> A Realistic Widget</a>
<ul>
<li class="chapter" data-level="" data-path="a-realistic-widget.html"><a href="a-realistic-widget.html#dependency"><i class="fa fa-check"></i>Dependency</a></li>
<li class="chapter" data-level="" data-path="a-realistic-widget.html"><a href="a-realistic-widget.html#javascript-1"><i class="fa fa-check"></i>JavaScript</a></li>
<li class="chapter" data-level="" data-path="a-realistic-widget.html"><a href="a-realistic-widget.html#html-element"><i class="fa fa-check"></i>HTML Element</a></li>
<li class="chapter" data-level="" data-path="a-realistic-widget.html"><a href="a-realistic-widget.html#exercises-1"><i class="fa fa-check"></i>Exercises</a></li>
</ul></li>
<li class="chapter" data-level="7" data-path="the-full-monty.html"><a href="the-full-monty.html"><i class="fa fa-check"></i><b>7</b> The Full Monty</a>
<ul>
<li class="chapter" data-level="" data-path="the-full-monty.html"><a href="the-full-monty.html#dependencies-1"><i class="fa fa-check"></i>Dependencies</a></li>
<li class="chapter" data-level="" data-path="the-full-monty.html"><a href="the-full-monty.html#javascript-2"><i class="fa fa-check"></i>JavaScript</a></li>
<li class="chapter" data-level="" data-path="the-full-monty.html"><a href="the-full-monty.html#working-with-data"><i class="fa fa-check"></i>Working with Data</a></li>
<li class="chapter" data-level="" data-path="the-full-monty.html"><a href="the-full-monty.html#transforming-data"><i class="fa fa-check"></i>Transforming Data</a>
<ul>
<li class="chapter" data-level="" data-path="the-full-monty.html"><a href="the-full-monty.html#in-javascript"><i class="fa fa-check"></i>In JavaScript</a></li>
<li class="chapter" data-level="" data-path="the-full-monty.html"><a href="the-full-monty.html#in-r"><i class="fa fa-check"></i>In R</a></li>
<li class="chapter" data-level="" data-path="the-full-monty.html"><a href="the-full-monty.html#pros-cons"><i class="fa fa-check"></i>Pros & Cons</a></li>
</ul></li>
<li class="chapter" data-level="" data-path="the-full-monty.html"><a href="the-full-monty.html#on-print"><i class="fa fa-check"></i>On Print</a></li>
<li class="chapter" data-level="" data-path="the-full-monty.html"><a href="the-full-monty.html#javascript-functions"><i class="fa fa-check"></i>JavaScript Functions</a></li>
</ul></li>
<li class="chapter" data-level="8" data-path="for-the-curious.html"><a href="for-the-curious.html"><i class="fa fa-check"></i><b>8</b> For The Curious</a></li>
<li class="chapter" data-level="" data-path="references.html"><a href="references.html"><i class="fa fa-check"></i>References</a></li>
</ul>
</nav>
</div>
<div class="book-body">
<div class="body-inner">
<div class="book-header" role="navigation">
<h1>
<i class="fa fa-circle-o-notch fa-spin"></i><a href="./">JavaScript for R</a>
</h1>
</div>
<div class="page-wrapper" tabindex="-1" role="main">
<div class="page-inner">
<section class="normal" id="section-">
<div id="from-javascript-to-r" class="section level1 unnumbered" number="">
<h1>From JavaScript to R</h1>
<p>Imagine if you will that instead of displaying a somewhat anodyne alert it was one that actually mattered where the user is warned that clicking “OK” will execute an irreversible action like the deletion of a record. In order to implement this the server would need to “know” whether the user has clicked said “OK” button. To do so one needs to pass data from the client to the server.</p>
<p>This can be done by defining a new <em>simplified</em> shiny input. While one can define a fully-fledged shiny input that can be registered, updated, etc. there is also a simplified version of the latter which allows sending reactive input value to the server where it can be used just like any other inputs (<code>input$id</code>). The value of the input can be defined using the <code>setInputValue</code> method which takes the id of the input and the value to give it.</p>
<div class="sourceCode" id="cb128"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb128-1"><a href="from-javascript-to-r.html#cb128-1"></a>tags<span class="op">$</span><span class="kw">script</span>(</span>
<span id="cb128-2"><a href="from-javascript-to-r.html#cb128-2"></a> <span class="st">"Shiny.addCustomMessageHandler(type = 'send-alert', function(message) {</span></span>
<span id="cb128-3"><a href="from-javascript-to-r.html#cb128-3"></a><span class="st"> </span></span>
<span id="cb128-4"><a href="from-javascript-to-r.html#cb128-4"></a><span class="st"> // show alert</span></span>
<span id="cb128-5"><a href="from-javascript-to-r.html#cb128-5"></a><span class="st"> alert(message);</span></span>
<span id="cb128-6"><a href="from-javascript-to-r.html#cb128-6"></a></span>
<span id="cb128-7"><a href="from-javascript-to-r.html#cb128-7"></a><span class="st"> // set to true when clicked OK</span></span>
<span id="cb128-8"><a href="from-javascript-to-r.html#cb128-8"></a><span class="st"> Shiny.setInputValue('delete_alert', true);</span></span>
<span id="cb128-9"><a href="from-javascript-to-r.html#cb128-9"></a><span class="st"> });"</span></span>
<span id="cb128-10"><a href="from-javascript-to-r.html#cb128-10"></a>)</span></code></pre></div>
<p>As mentioned earlier <code>alert</code> blocks code execution, therefore the input value will not be defined before the button “OK” is pressed. The server can now access the <code>input$delete_alert</code> input which is by default <code>NULL</code> and set to <code>TRUE</code> when the user has pressed “OK,” as done in the application below which prints the input to the console when the button is clicked.</p>
<div class="sourceCode" id="cb129"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb129-1"><a href="from-javascript-to-r.html#cb129-1"></a><span class="kw">library</span>(shiny)</span>
<span id="cb129-2"><a href="from-javascript-to-r.html#cb129-2"></a></span>
<span id="cb129-3"><a href="from-javascript-to-r.html#cb129-3"></a>ui <-<span class="st"> </span><span class="kw">fluidPage</span>(</span>
<span id="cb129-4"><a href="from-javascript-to-r.html#cb129-4"></a> tags<span class="op">$</span><span class="kw">script</span>(</span>
<span id="cb129-5"><a href="from-javascript-to-r.html#cb129-5"></a> <span class="st">"Shiny.addCustomMessageHandler(type = 'send-alert', function(message) {</span></span>
<span id="cb129-6"><a href="from-javascript-to-r.html#cb129-6"></a><span class="st"> alert(message);</span></span>
<span id="cb129-7"><a href="from-javascript-to-r.html#cb129-7"></a><span class="st"> Shiny.setInputValue('delete_alert', true);</span></span>
<span id="cb129-8"><a href="from-javascript-to-r.html#cb129-8"></a><span class="st"> });"</span></span>
<span id="cb129-9"><a href="from-javascript-to-r.html#cb129-9"></a> ),</span>
<span id="cb129-10"><a href="from-javascript-to-r.html#cb129-10"></a> <span class="kw">h1</span>(<span class="st">"Hello"</span>)</span>
<span id="cb129-11"><a href="from-javascript-to-r.html#cb129-11"></a>)</span>
<span id="cb129-12"><a href="from-javascript-to-r.html#cb129-12"></a></span>
<span id="cb129-13"><a href="from-javascript-to-r.html#cb129-13"></a>server <-<span class="st"> </span><span class="cf">function</span>(input, output, session){</span>
<span id="cb129-14"><a href="from-javascript-to-r.html#cb129-14"></a> session<span class="op">$</span><span class="kw">sendCustomMessage</span>(<span class="dt">type =</span> <span class="st">"send-alert"</span>, <span class="dt">message =</span> <span class="st">"Deleting a record!"</span>)</span>
<span id="cb129-15"><a href="from-javascript-to-r.html#cb129-15"></a></span>
<span id="cb129-16"><a href="from-javascript-to-r.html#cb129-16"></a> <span class="kw">observeEvent</span>(input<span class="op">$</span>delete_alert, {</span>
<span id="cb129-17"><a href="from-javascript-to-r.html#cb129-17"></a> <span class="co"># print TRUE when button is clicked</span></span>
<span id="cb129-18"><a href="from-javascript-to-r.html#cb129-18"></a> <span class="kw">print</span>(input<span class="op">$</span>delete_alert) </span>
<span id="cb129-19"><a href="from-javascript-to-r.html#cb129-19"></a> })</span>
<span id="cb129-20"><a href="from-javascript-to-r.html#cb129-20"></a>}</span>
<span id="cb129-21"><a href="from-javascript-to-r.html#cb129-21"></a></span>
<span id="cb129-22"><a href="from-javascript-to-r.html#cb129-22"></a><span class="kw">shinyApp</span>(ui, server)</span></code></pre></div>
</div>
</section>
</div>
</div>
</div>
<a href="from-r-to-javascript.html" class="navigation navigation-prev " aria-label="Previous page"><i class="fa fa-angle-left"></i></a>
<a href="a-realistic-approach.html" class="navigation navigation-next " aria-label="Next page"><i class="fa fa-angle-right"></i></a>
</div>
</div>
<script src="libs/gitbook/js/app.min.js"></script>
<script src="libs/gitbook/js/lunr.js"></script>
<script src="libs/gitbook/js/clipboard.min.js"></script>
<script src="libs/gitbook/js/plugin-search.js"></script>
<script src="libs/gitbook/js/plugin-sharing.js"></script>
<script src="libs/gitbook/js/plugin-fontsettings.js"></script>
<script src="libs/gitbook/js/plugin-bookdown.js"></script>
<script src="libs/gitbook/js/jquery.highlight.js"></script>
<script src="libs/gitbook/js/plugin-clipboard.js"></script>
<script>
gitbook.require(["gitbook"], function(gitbook) {
gitbook.start({
"sharing": {
"github": true,
"facebook": false,
"twitter": false,
"linkedin": false,
"weibo": false,
"instapaper": false,
"vk": false,
"all": {}
},
"fontsettings": {
"theme": "white",
"family": "sans",
"size": 2
},
"edit": {
"link": "https://github.com/JohnCoene/r-and-javascript/edit/master/11-shiny-first-look.Rmd",
"text": "Edit"
},
"history": {
"link": null,
"text": null
},
"view": {
"link": null,
"text": null
},
"download": {},
"toc": {
"collapse": "section"
}
});
});
</script>
</body>
</html>