標籤：
二、QT支援Js流程
QT與JavaScript互調是通過QWebFrame的兩個函數來實現的:addToJavaScriptWindowObject()將QObject對象傳給JS，這樣JS就能調用QObject的public slots函數。QT通過evaluateJavaScript()直接調用JS中的函數。流程如下（《QT進階編程》中插圖）：
三、樣本
使用QWebKit建立一個包含瀏覽器和工具按鈕視窗，在該瀏覽器中載入包括Js的html，工具按鈕調用html中的js
1、工程中引入 webkit
工程檔案中增加加：QT += webkit network
2、載入html網頁
m_pWebView = new QWebView;
m_pWebView->load(QUrl(tr("G:\\html特效樣本\\jsTest.html")));
3、開戶js支援
QWebSettings *pWebSettings = m_pWebView->page()->settings();
pWebSettings->setAttribute(QWebSettings::JavascriptEnabled,true);
4、表單布局
//添加按鈕
QPushButton *pEventBtn = new QPushButton(tr("QT Invok Js"));
QPushButton *pcloseBtn = new QPushButton(tr("close"));
//布局：網頁與按鈕為上下布局，兩按鈕為水平置中布局
QHBoxLayout *pBtnLayout = new QHBoxLayout;
pBtnLayout->addWidget(pEventBtn);
pBtnLayout->addWidget(pcloseBtn);
pBtnLayout->setAlignment(Qt::AlignCenter);
QVBoxLayout *pMainLayout = new QVBoxLayout;
pMainLayout->addWidget(m_pWebView);
pMainLayout->addLayout(pBtnLayout);
QWidget *widget = new QWidget;
widget->setLayout(pMainLayout);
setCentralWidget(widget);
5、建立訊號與槽
//每次載入html時發送段訊號
connect(m_pWebView->page()->mainFrame(),SIGNAL(javaScriptWindowObjectCleared()), this,SLOT(addObjectToJs()));
//按鈕訊號
connect(pEventBtn,SIGNAL(clicked()),this,SLOT(testJs()));
connect(pcloseBtn,SIGNAL(clicked()),this,SLOT(close()));
6、JS調用QT中的public slots
6.1、標頭檔中申明public slots:
public slots:
void jsInvokQt();
6.2、將QObject與js綁定
void MainWindow::addObjectToJs()
{
m_pWebView->page()->mainFrame()->addToJavaScriptWindowObject("MainWindow",this);
}
6.3、Js中調用QT的 jsInvokQt()函數
function disp_qtmessage()
{
MainWindow.jsInvokQt();
}
7、QT調用JS函數disp_messagebox()
void MainWindow::testJs()
{
m_pWebView->page()->mainFrame()->evaluateJavaScript("disp_messagebox()");
}
四、附含JS的html源碼:
<html>
<head>
<script type="text/javascript">
function disp_messagebox()
{
alert("This is javaScript MessageBox!")
}
function disp_qtmessage()
{
MainWindow.jsInvokQt();
MainWindow.setInfor("Qt change string");
alert(MainWindow.getInfor());
}
</script>
</head>
<body>
<input type="button" onclick="disp_qtmessage()" value="InvokQt" />
</body>
</html>
qt與js互相調用
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