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Connecting to a QObjects signal with JavaScript slot in Qt WebKit

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* Qt is installed on your platform.
 
* Qt is installed on your platform.
** S60:
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** Symbian S60:
 
*** Download Qt for Symbian release from here: [http://qt.nokia.com/downloads Qt Downloads]
 
*** Download Qt for Symbian release from here: [http://qt.nokia.com/downloads Qt Downloads]
 
*** Install Qt for Symbian: [[Installing Qt on Symbian]]
 
*** Install Qt for Symbian: [[Installing Qt on Symbian]]

Revision as of 17:06, 16 December 2009

Article Metadata
Tested with
Devices(s): Nokia N97, Nokia N900
Compatibility
Platform(s): Qt
Article
Keywords: Qt, web, WebKit, HTML, QWebView
Created: (04 Dec 2009)
Last edited: seppo_fn (16 Dec 2009)

Contents

Overview

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

Preconditions

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.

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 needed resources, like the #view.html, 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 be displaying 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 to an exposed QObject signal to a JavaScript slot with Qt WebKit.

See also

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