QWebengine 调用js有两种方式
- 通过QWebChannel调用
写一个类然后继承QObject用于和js进行通信交互
#ifndef TINTERACT_OBJECT_H
#define TINTERACT_OBJECT_H
#include <QObject>
class TInteractObj : public QObject
{
Q_OBJECT
public:
TInteractObj(QObject *parent);
~TInteractObj();
Q_INVOKABLE void JSSendMessage(QString strParameter); //Called by JS: Send message to Qt
signals:
void SigReceivedMessFromJS(QString strParameter); //Receive message from Web
void SigSendMessageToJS(QString strParameter); //Send message to Web
};
#endif //TINTERACT_OBJECT_H
#include "TInteractObject.h"
TInteractObj::TInteractObj(QObject *parent)
:QObject(parent)
{
}
TInteractObj::~TInteractObj()
{
}
void TInteractObj::JSSendMessage(QString strParameter)
{
emit SigReceivedMessFromJS(strParameter);
}
需要用QWebChannel 注册上面那个类 调用实例如下
#ifndef TMAINWINDOW_H
#define TMAINWINDOW_H
#include <QDialog>
QT_BEGIN_NAMESPACE
class QPlainTextEdit;
class QLineEdit;
class QPushButton;
class QWebEngineView;
QT_END_NAMESPACE
class TMainWindow : public QDialog
{
Q_OBJECT
public:
TMainWindow(QDialog *parent = );
~TMainWindow();
void OnReceiveMessageFromJS(QString strParameter);
signals:
void SigSendMessageToJS(QString strParameter);
private:
void OnSendMessageByInteractObj();
void OnSendMessageByJavaScript();
QPlainTextEdit *mpQtContentTextEdit;
QLineEdit *mpQtSendLineEdit;
QPushButton *mpQtSendBtnByInteractObj;
QPushButton *mpQtSendBtnByJavaScript;
QWebEngineView *mpJSWebView;
};
#endif //TMAINWINDOW_H
#include "TMainWindow.h"
#include "TInteractObject.h"
#include <QPlainTextEdit>
#include <QLineEdit>
#include <QPushButton>
#include <QHBoxLayout>
#include <QVBoxLayout>
#include <QGroupBox>
#include <QWebChannel>
#include <QWebEngineView>
#include <QFileInfo>
TMainWindow::TMainWindow(QDialog *parent)
: QDialog(parent)
{
//---Qt widget and layout---
mpQtContentTextEdit = new QPlainTextEdit(this);
mpQtContentTextEdit->setMidLineWidth();
mpQtContentTextEdit->setReadOnly(true);
mpQtSendLineEdit = new QLineEdit(this);
mpQtSendBtnByInteractObj = new QPushButton("Send", this);
mpQtSendBtnByInteractObj->setToolTip(tr("Send message by Interact object style"));
mpQtSendBtnByJavaScript = new QPushButton("Send2", this);
mpQtSendBtnByJavaScript->setToolTip(tr("Send message by runJavaScript style"));
QHBoxLayout *pQtSendHLayout = new QHBoxLayout;
pQtSendHLayout->setMargin();
pQtSendHLayout->setSpacing();
pQtSendHLayout->addWidget(mpQtSendLineEdit);
pQtSendHLayout->addSpacing();
pQtSendHLayout->addWidget(mpQtSendBtnByInteractObj);
pQtSendHLayout->addSpacing();
pQtSendHLayout->addWidget(mpQtSendBtnByJavaScript);
QVBoxLayout *pQtTotalVLayout = new QVBoxLayout;
pQtTotalVLayout->setMargin();
pQtTotalVLayout->setSpacing();
pQtTotalVLayout->addWidget(mpQtContentTextEdit);
pQtTotalVLayout->addSpacing();
pQtTotalVLayout->addLayout(pQtSendHLayout);
QGroupBox *pQtGroup = new QGroupBox("Qt View", this);
pQtGroup->setLayout(pQtTotalVLayout);
//---Web widget and layout---
mpJSWebView = new QWebEngineView(this);
QWebChannel *pWebChannel = new QWebChannel(mpJSWebView->page());
TInteractObj *pInteractObj = new TInteractObj(this);
pWebChannel->registerObject(QStringLiteral("interactObj"), pInteractObj);
mpJSWebView->page()->setWebChannel(pWebChannel);
mpJSWebView->page()->load(QUrl::fromLocalFile(QFileInfo("./JSTest.html").absoluteFilePath()));
mpJSWebView->show();
QVBoxLayout *pJSTotalVLayout = new QVBoxLayout();
pJSTotalVLayout->setMargin();
pJSTotalVLayout->setSpacing();
pJSTotalVLayout->addWidget(mpJSWebView);
QGroupBox *pWebGroup = new QGroupBox("Web View", this);
pWebGroup->setLayout(pJSTotalVLayout);
//---TMainWindow total layout---
QHBoxLayout *mainLayout = new QHBoxLayout;
mainLayout->setMargin();
mainLayout->setSpacing();
mainLayout->addWidget(pQtGroup);
mainLayout->addSpacing();
mainLayout->addWidget(pWebGroup);
setLayout(mainLayout);
, );
connect(mpQtSendBtnByInteractObj, &QPushButton::clicked, this, &TMainWindow::OnSendMessageByInteractObj);
connect(mpQtSendBtnByJavaScript, &QPushButton::clicked, this, &TMainWindow::OnSendMessageByJavaScript);
connect(pInteractObj, &TInteractObj::SigReceivedMessFromJS, this, &TMainWindow::OnReceiveMessageFromJS);
connect(this, &TMainWindow::SigSendMessageToJS, pInteractObj, &TInteractObj::SigSendMessageToJS);
}
TMainWindow::~TMainWindow()
{
}
void TMainWindow::OnReceiveMessageFromJS(QString strParameter)
{
if (strParameter.isEmpty())
{
return;
}
mpQtContentTextEdit->appendPlainText(strParameter);
}
void TMainWindow::OnSendMessageByInteractObj()
{
QString strMessage = mpQtSendLineEdit->text().trimmed();
if (strMessage.isEmpty())
{
return;
}
emit SigSendMessageToJS(strMessage);
}
void TMainWindow::OnSendMessageByJavaScript()
{
QString strMessage = mpQtSendLineEdit->text().trimmed();
if (strMessage.isEmpty())
{
return;
}
strMessage = QString("Received string from Qt: %1").arg(strMessage);
mpJSWebView->page()->runJavaScript(QString("output('%1');").arg(strMessage));
}
在调用的html中需要应用qt官方给出的js文件
"use strict";
var QWebChannelMessageTypes = {
signal: ,
propertyUpdate: ,
init: ,
idle: ,
debug: ,
invokeMethod: ,
connectToSignal: ,
disconnectFromSignal: ,
setProperty: ,
response: ,
};
var QWebChannel = function(transport, initCallback)
{
if (typeof transport !== "object" || typeof transport.send !== "function") {
console.error("The QWebChannel expects a transport object with a send function and onmessage callback property." +
" Given is: transport: " + typeof(transport) + ", transport.send: " + typeof(transport.send));
return;
}
var channel = this;
this.transport = transport;
this.send = function(data)
{
if (typeof(data) !== "string") {
data = JSON.stringify(data);
}
channel.transport.send(data);
}
this.transport.onmessage = function(message)
{
var data = message.data;
if (typeof data === "string") {
data = JSON.parse(data);
}
switch (data.type) {
case QWebChannelMessageTypes.signal:
channel.handleSignal(data);
break;
case QWebChannelMessageTypes.response:
channel.handleResponse(data);
break;
case QWebChannelMessageTypes.propertyUpdate:
channel.handlePropertyUpdate(data);
break;
default:
console.error("invalid message received:", message.data);
break;
}
}
this.execCallbacks = {};
;
this.exec = function(data, callback)
{
if (!callback) {
channel.send(data);
return;
}
if (channel.execId === Number.MAX_VALUE) {
channel.execId = Number.MIN_VALUE;
}
if (data.hasOwnProperty("id")) {
console.error("Cannot exec message with property id: " + JSON.stringify(data));
return;
}
data.id = channel.execId++;
channel.execCallbacks[data.id] = callback;
channel.send(data);
};
this.objects = {};
this.handleSignal = function(message)
{
var object = channel.objects[message.object];
if (object) {
object.signalEmitted(message.signal, message.args);
} else {
console.warn("Unhandled signal: " + message.object + "::" + message.signal);
}
}
this.handleResponse = function(message)
{
if (!message.hasOwnProperty("id")) {
console.error("Invalid response message received: ", JSON.stringify(message));
return;
}
channel.execCallbacks[message.id](message.data);
delete channel.execCallbacks[message.id];
}
this.handlePropertyUpdate = function(message)
{
for (var i in message.data) {
var data = message.data[i];
var object = channel.objects[data.object];
if (object) {
object.propertyUpdate(data.signals, data.properties);
} else {
console.warn("Unhandled property update: " + data.object + "::" + data.signal);
}
}
channel.exec({type: QWebChannelMessageTypes.idle});
}
this.debug = function(message)
{
channel.send({type: QWebChannelMessageTypes.debug, data: message});
};
channel.exec({type: QWebChannelMessageTypes.init}, function(data) {
for (var objectName in data) {
var object = new QObject(objectName, data[objectName], channel);
}
for (var objectName in channel.objects) {
channel.objects[objectName].unwrapProperties();
}
if (initCallback) {
initCallback(channel);
}
channel.exec({type: QWebChannelMessageTypes.idle});
});
};
function QObject(name, data, webChannel)
{
this.__id__ = name;
webChannel.objects[name] = this;
this.__objectSignals__ = {};
this.__propertyCache__ = {};
var object = this;
this.unwrapQObject = function(response)
{
if (response instanceof Array) {
var ret = new Array(response.length);
; i < response.length; ++i) {
ret[i] = object.unwrapQObject(response[i]);
}
return ret;
}
if (!response
|| !response["__QObject*__"]
|| response.id === undefined) {
return response;
}
var objectId = response.id;
if (webChannel.objects[objectId])
return webChannel.objects[objectId];
if (!response.data) {
console.error("Cannot unwrap unknown QObject " + objectId + " without data.");
return;
}
var qObject = new QObject( objectId, response.data, webChannel );
qObject.destroyed.connect(function() {
if (webChannel.objects[objectId] === qObject) {
delete webChannel.objects[objectId];
var propertyNames = [];
for (var propertyName in qObject) {
propertyNames.push(propertyName);
}
for (var idx in propertyNames) {
delete qObject[propertyNames[idx]];
}
}
});
qObject.unwrapProperties();
return qObject;
}
this.unwrapProperties = function()
{
for (var propertyIdx in object.__propertyCache__) {
object.__propertyCache__[propertyIdx] = object.unwrapQObject(object.__propertyCache__[propertyIdx]);
}
}
function addSignal(signalData, isPropertyNotifySignal)
{
];
];
object[signalName] = {
connect: function(callback) {
if (typeof(callback) !== "function") {
console.error("Bad callback given to connect to signal " + signalName);
return;
}
object.__objectSignals__[signalIndex] = object.__objectSignals__[signalIndex] || [];
object.__objectSignals__[signalIndex].push(callback);
if (!isPropertyNotifySignal && signalName !== "destroyed") {
webChannel.exec({
type: QWebChannelMessageTypes.connectToSignal,
object: object.__id__,
signal: signalIndex
});
}
},
disconnect: function(callback) {
if (typeof(callback) !== "function") {
console.error("Bad callback given to disconnect from signal " + signalName);
return;
}
object.__objectSignals__[signalIndex] = object.__objectSignals__[signalIndex] || [];
var idx = object.__objectSignals__[signalIndex].indexOf(callback);
) {
console.error("Cannot find connection of signal " + signalName + " to " + callback.name);
return;
}
);
) {
webChannel.exec({
type: QWebChannelMessageTypes.disconnectFromSignal,
object: object.__id__,
signal: signalIndex
});
}
}
};
}
function invokeSignalCallbacks(signalName, signalArgs)
{
var connections = object.__objectSignals__[signalName];
if (connections) {
connections.forEach(function(callback) {
callback.apply(callback, signalArgs);
});
}
}
this.propertyUpdate = function(signals, propertyMap)
{
for (var propertyIndex in propertyMap) {
var propertyValue = propertyMap[propertyIndex];
object.__propertyCache__[propertyIndex] = propertyValue;
}
for (var signalName in signals) {
invokeSignalCallbacks(signalName, signals[signalName]);
}
}
this.signalEmitted = function(signalName, signalArgs)
{
invokeSignalCallbacks(signalName, signalArgs);
}
function addMethod(methodData)
{
];
];
object[methodName] = function() {
var args = [];
var callback;
; i < arguments.length; ++i) {
if (typeof arguments[i] === "function")
callback = arguments[i];
else
args.push(arguments[i]);
}
webChannel.exec({
"type": QWebChannelMessageTypes.invokeMethod,
"object": object.__id__,
"method": methodIdx,
"args": args
}, function(response) {
if (response !== undefined) {
var result = object.unwrapQObject(response);
if (callback) {
(callback)(result);
}
}
});
};
}
function bindGetterSetter(propertyInfo)
{
];
];
];
];
if (notifySignalData) {
] === ) {
notifySignalData[] = propertyName + "Changed";
}
addSignal(notifySignalData, true);
}
Object.defineProperty(object, propertyName, {
configurable: true,
get: function () {
var propertyValue = object.__propertyCache__[propertyIndex];
if (propertyValue === undefined) {
console.warn("Undefined value in property cache for property \"" + propertyName + "\" in object " + object.__id__);
}
return propertyValue;
},
set: function(value) {
if (value === undefined) {
console.warn("Property setter for " + propertyName + " called with undefined value!");
return;
}
object.__propertyCache__[propertyIndex] = value;
webChannel.exec({
"type": QWebChannelMessageTypes.setProperty,
"object": object.__id__,
"property": propertyIndex,
"value": value
});
}
});
}
data.methods.forEach(addMethod);
data.properties.forEach(bindGetterSetter);
data.signals.forEach(function(signal) { addSignal(signal, false); });
for (var name in data.enums) {
object[name] = data.enums[name];
}
}
if (typeof module === 'object') {
module.exports = {
QWebChannel: QWebChannel
};
}
QWebChannel注册类的信号和下面interactObj.SigSendMessageToJS.connect和 interactObj.JSSendMessage方法名字一样 实例如下
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script type="text/javascript" src="qrc:///qtwebchannel/qwebchannel.js"></script>
<script type="text/javascript">
function output(message)
{
var output = document.getElementById("output");
output.innerHTML = output.innerHTML + message + "\n";
}
window.onload = function() {
output("");
new QWebChannel(qt.webChannelTransport, function(channel) {
var interactObj = channel.objects.interactObj;
document.getElementById("send").onclick = function() {
var input = document.getElementById("input");
if (!input.value) {
return;
}
interactObj.JSSendMessage(input.value);
input.value = "";
}
interactObj.SigSendMessageToJS.connect(function(str) {
output("Received string from Qt: " + str);
});
});
}
</script>
<style type="text/css">
html {
height: 100%;
width: 100%;
}
#input {
width: 650px;
margin: 0 10px 0 0;
}
#send {
width: 90px;
margin: 0;
}
#output {
width: 770px;
height: 550px;
}
</style>
</head>
<body>
<textarea id="output" readonly="readonly"></textarea><br />
<input id="input" />
<input type="submit" id="send" value="Send" onclick="javascript:click();" />
</body>
</html>
2.直接通过QWebPage调用
QWebPage 中runJavaScript调用html中js函数
QString cmd = QString("Load(\"%1\")").arg(sMsg);
m_webView->page()->runJavaScript(cmd);
注意如果是传的字符串需要将原有字符串中"替换为’传递然后在html中转回来
sMsg.replace(""","’");
html转回来
parameters=parameters.replace(/’/g, ‘"’);
实例
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script type="text/javascript">
function Load(message)
{
alert(message);
}
</script>
</head>
</html>
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