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witty-3.3.0
examples
javascript
JavascriptExample.C
Go to the documentation of this file.
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/*
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* Copyright (C) 2008 Emweb bvba, Kessel-Lo, Belgium.
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*
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* See the LICENSE file for terms of use.
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*/
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#include <iostream>
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#include <Wt/WApplication>
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#include <Wt/WBreak>
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#include <Wt/WContainerWidget>
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#include <Wt/WText>
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#include <Wt/WPushButton>
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#include "
JavascriptExample.h
"
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#include "
Popup.h
"
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using namespace
Wt;
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JavascriptExample::JavascriptExample
(
const
WEnvironment
& env)
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:
WApplication
(env)
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{
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setTitle
(
"Javascript example"
);
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// Create a popup for prompting the amount of money, and connect the
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// okPressed button to the slot for setting the amount of money.
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//
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// Note that the input provided by the user in the prompt box is passed as
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// an argument to the slot.
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promptAmount_
=
Popup::createPrompt
(
"How much do you want to pay?"
,
""
,
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this
);
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promptAmount_
->
okPressed
().
connect
(
this
, &
JavascriptExample::setAmount
);
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// Create a popup for confirming the payment.
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//
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// Since a confirm popup does not allow input, we ignore the
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// argument carrying the input (which will be empty anyway).
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confirmPay_
=
Popup::createConfirm
(
""
,
this
);
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confirmPay_
->
okPressed
().
connect
(
this
, &
JavascriptExample::confirmed
);
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new
WText
(
"<h2>Wt Javascript example</h2>"
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"<p>Wt makes abstraction of Javascript, and therefore allows you"
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" to develop web applications without any knowledge of Javascript,"
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" and which are not dependent on Javascript."
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" However, Wt does allow you to add custom Javascript code:</p>"
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" <ul>"
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" <li>To call custom JavaScript code from an event handler, "
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"connect the Wt::EventSignal to a Wt::JSlot.</li>"
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" <li>To call C++ code from custom JavaScript, use "
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"Wt.emit() to emit a Wt::JSignal.</li>"
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" <li>To call custom JavaScript code from C++, use "
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"WApplication::doJavascript() or Wt::JSlot::exec().</li>"
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" </ul>"
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"<p>This simple application shows how to interact between C++ and"
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" JavaScript using the JSlot and JSignal classes.</p>"
,
root
());
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currentAmount_
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=
new
WText
(
"Current amount: $"
+
promptAmount_
->
defaultValue
(),
root
());
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WPushButton
*amountButton =
new
WPushButton
(
"Change ..."
,
root
());
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amountButton->setMargin(10,
Left
|
Right
);
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new
WBreak
(
root
());
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WPushButton
*confirmButton =
new
WPushButton
(
"Pay now."
,
root
());
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confirmButton->
setMargin
(10,
Top
|
Bottom
);
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// Connect the event handlers to a JSlot: this will execute the JavaScript
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// immediately, without a server round trip.
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amountButton->clicked().connect(
promptAmount_
->
show
);
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confirmButton->clicked().connect(
confirmPay_
->
show
);
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// Set the initial amount
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setAmount
(
"1000"
);
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}
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void
JavascriptExample::setAmount
(
const
std::string amount)
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{
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// Change the confirmation message to include the amount.
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confirmPay_
->
setMessage
(
"Are you sure you want to pay $"
+ amount +
" ?"
);
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// Change the default value for the prompt.
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promptAmount_
->
setDefaultValue
(amount);
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// Change the text that shows the current amount.
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currentAmount_
->setText(
"Current amount: $"
+
promptAmount_
->
defaultValue
());
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}
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void
JavascriptExample::confirmed
()
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{
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new
WText
(
"<br/>Just payed $"
+
promptAmount_
->
defaultValue
() +
"."
,
root
());
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}
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WApplication
*
createApplication
(
const
WEnvironment
& env)
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{
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return
new
JavascriptExample
(env);
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}
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int
main
(
int
argc,
char
**argv)
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{
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return
WRun(argc, argv, &
createApplication
);
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}
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