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Connecting to a QObjects signal with JavaScript slot in Qt WebKit

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[[Category:Code Examples]]
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[[Category:Qt]]
 
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{{CodeSnippet
 
{{CodeSnippet
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|id=CS001545
 
|platform=Qt
 
|platform=Qt
 
|devices=Nokia N97, Nokia N900
 
|devices=Nokia N97, Nokia N900
 
|category=Qt
 
|category=Qt
 
|subcategory=Browsing, WebKit
 
|subcategory=Browsing, WebKit
|creationdate=December 4, 2009
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|creationdate=December 29, 2009
 
|keywords=Qt, web, WebKit, HTML, QWebView
 
|keywords=Qt, web, WebKit, HTML, QWebView
 
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==Overview==
 
==Overview==
  
This snippet demonstrates how to connect a exposed QObjects signal to a JavaScript slot with [http://doc.trolltech.com/qtwebkit.html Qt WebKit].
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This snippet demonstrates how to connect an exposed QObjects signal to a JavaScript slot with the [http://doc.trolltech.com/qtwebkit.html Qt WebKit].
  
 
==Preconditions==
 
==Preconditions==
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** Maemo:
 
** Maemo:
 
*** More information about Qt on Maemo can be found here: [http://qt4.garage.maemo.org/ Qt4 Maemo port]
 
*** More information about Qt on Maemo can be found here: [http://qt4.garage.maemo.org/ Qt4 Maemo port]
* You've exposed the QObject like in this article [[Exposing QObjects to Qt Webkit]].
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* You've exposed the QObject as demonstrated in the article [[CS001543 - Exposing QObjects to Qt Webkit]].
  
 
== Code ==
 
== Code ==
  
First we need to reference a html page and JavaScript file with the resource file. Of course the resource file has to be referenced also from the project file.
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First, we need to reference a HTML page and a JavaScript file with the resource file. The resource file also needs to be referenced from the project file.
  
 
=== WebKit_JS_signal.pro ===
 
=== WebKit_JS_signal.pro ===
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=== resources.qrc ===
 
=== resources.qrc ===
  
Here we reference all the needed resources, like the [[#view.html]], [http://jquery.com/ jquery.js helper library] and [[#signal.js]].
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Here we reference all the required resources, like [[#view.html]], the [http://jquery.com/ jquery.js helper library], and [[#signal.js]].
  
 
<code xml>
 
<code xml>
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=== view.html ===
 
=== view.html ===
  
This is the HTML we will be displaying in the QWebView and where we'll reference the JavaScript files.
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This is the HTML we will display in the QWebView and where we'll reference the JavaScript files.
  
 
<code xml>
 
<code xml>
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==Postconditions==
 
==Postconditions==
  
You've successfully connected to an exposed QObject signal to a JavaScript slot with Qt WebKit.
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You've successfully connected an exposed QObject signal with a JavaScript slot with Qt WebKit.
  
 
==See also==
 
==See also==
  
 
* [[CS001544 - Calling an exposed QObject slot from Qt WebKit with JavaScript]]
 
* [[CS001544 - Calling an exposed QObject slot from Qt WebKit with JavaScript]]

Revision as of 14:31, 29 December 2009

Template:KBCS

Article Metadata
Tested with
Devices(s): Nokia N97, Nokia N900
Compatibility
Platform(s): Qt
Article
Keywords: Qt, web, WebKit, HTML, QWebView
Created: (29 Dec 2009)
Last edited: Forum Nokia KB (29 Dec 2009)

Contents

Overview

This snippet demonstrates how to connect an exposed QObjects signal to a JavaScript slot with the Qt WebKit.

Preconditions

Code

First, we need to reference a HTML page and a JavaScript file with the resource file. The resource file also needs to be referenced from the project file.

WebKit_JS_signal.pro

QT += webkit
TARGET = WebKit_JS_slot
TEMPLATE = app
SOURCES += main.cpp \
mainwindow.cpp \
sampleqobject.cpp
HEADERS += mainwindow.h \
sampleqobject.h
FORMS += mainwindow.ui
RESOURCES += resources.qrc

resources.qrc

Here we reference all the required resources, like #view.html, the jquery.js helper library, and #signal.js.

<RCC>
<qresource prefix="/">
<file>view.html</file>
<file>jquery.js</file>
<file>signal.js</file>
</qresource>
</RCC>

view.html

This is the HTML we will display in the QWebView and where we'll reference the JavaScript files.

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!-- Copyright (c) 2009 Nokia Corporation. -->
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<!-- You reference the resources with qrc:/ -->
<!-- JavaScript includes -->
<!-- jQuery http://jquery.com/ -->
<script type="text/javascript" src="qrc:/jquery.js" />
<!-- signal -->
<script type="text/javascript" src="qrc:/signal.js" />
 
<title>Signal</title>
</head>
<body>
<h1>Demonstrates signals</h1>
</body>
</html>

signal.js

/**
* This is run after the the web page has been rendered.
* $(document).ready documented here:
* http://docs.jquery.com/Tutorials:Introducing_$(document).ready()
*/

$(document).ready(function() {
try {
/* This connects sampleQObjects signal to our slot */
sampleQObject.signal.connect(slot);
/* This calls a slot which then in turn emits the signal. */
sampleQObject.slotThatEmitsSignal();
}
catch(e) {
alert(e);
}
});
 
function slot(object) {
var objectString = object.sender +
" has emited signal " +
object.signalsEmited +
" times.";
alert(objectString);
}

Postconditions

You've successfully connected an exposed QObject signal with a JavaScript slot with Qt WebKit.

See also

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