Qt之QtWebKit(二)

最新推荐文章于 2023-09-22 01:35:50 发布

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#qt #login #stylesheet #javascript #scroll #microsoft

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本文介绍了一个使用QtWebKit实现的登录界面示例，演示了如何通过C++对象与JavaScript进行交互，实现登录验证功能。

继续学习QtWebkit.今天做个登录的例子让Qt对象和Javascript通信。其实就是将C++对象注册为一个javascript对象到html。然后调用C++函数。

//loginform.h #ifndef LOGINFORM_H #define LOGINFORM_H #include <QWidget> namespace Ui { class LoginForm; } class LoginForm : public QWidget { Q_OBJECT public: explicit LoginForm(QWidget *parent = 0); ~LoginForm(); private: Ui::LoginForm *ui; public slots: void javaScriptWindowObjectCleared(); void login(); }; #endif // LOGINFORM_H

//loginform.cpp #include "loginform.h" #include "ui_loginform.h" #include <QtGui> #include <QtWebKit/QWebFrame> #include <QtWebKit/QWebElement> LoginForm::LoginForm(QWidget *parent) : QWidget(parent), ui(new Ui::LoginForm) { ui->setupUi(this); ui->webView->setUrl(QUrl("qrc:/loginForm.html")); connect(ui->webView->page()->mainFrame(), SIGNAL(javaScriptWindowObjectCleared()), this, SLOT(javaScriptWindowObjectCleared())); resize(200,300); } LoginForm::~LoginForm() { delete ui; } void LoginForm::javaScriptWindowObjectCleared() { ui->webView->page()->mainFrame()->addToJavaScriptWindowObject("loginForm", this); } void LoginForm::login() { QWebFrame *frame = ui->webView->page()->mainFrame(); QWebElement userNameEle = frame->findFirstElement("#userName"); QWebElement passwordEle = frame->findFirstElement("#password"); QString userName = userNameEle.evaluateJavaScript("this.value").toString(); QString password = passwordEle.evaluateJavaScript("this.value").toString(); QMessageBox *loginMsgBox = new QMessageBox(this); loginMsgBox->setIcon(QMessageBox::Information); loginMsgBox->setWindowTitle(tr("登录信息")); if(userName == password) { loginMsgBox->setText(tr("你的用户名为： %1,密码为: %2").arg(userName).arg(password)); }else { loginMsgBox->setText(tr("用户名或密码错误")); } loginMsgBox->setDefaultButton(QMessageBox::Ok); loginMsgBox->exec(); }

//mainwindow.h #ifndef MAINWINDOW_H #define MAINWINDOW_H #include <QtGui/QMainWindow> class MainWindow : public QMainWindow { Q_OBJECT public: MainWindow(QWidget *parent = 0); ~MainWindow(); }; #endif // MAINWINDOW_H

//mainwindow.cpp #include "mainwindow.h" #include "loginform.h" MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent) { this->setWindowTitle(tr("登录")); LoginForm *loginForm = new LoginForm(this); this->setCentralWidget(loginForm); this->setUnifiedTitleAndToolBarOnMac(true); this->setFixedSize(300,200); } MainWindow::~MainWindow() { }

//loginForm.html <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>登录</title> <link rel="stylesheet" href="qrc:/loginForm.css" mce_href="qrc://writeblog.youkuaiyun.com/loginForm.css" type="text/css"/> <mce:script type="text/javascript" src="qrc:/loginForm.js" mce_src="qrc://writeblog.youkuaiyun.com/loginForm.js"></mce:script> </head> <body> <table> <tr> <td>帐号：<td> <td><input type="text" name="userName" value="" id="userName"> <td> <tr> <tr> <td>密码:<td> <td><input type="password" name="password" id="password"> <td> <tr> <tr> <td> <input id="btn_login" type="button" onclick="login();" value="登录" /><td> <td><a title="忘记密码" href="" >忘记了密码？</a> <td> <tr> </body> </html>

//loginForm.js function login() { var userName = document.getElementById("userName").value; var password = document.getElementById("password").value; if(userName == "") { alert("用户名不能为空"); } else if (password == "") { alert("密码不能为空"); } else { loginForm.login(); } }

//loginForm.css * { margin:0; padding:0; } body { background: url("qrc:/images/bodybg.gif") repeat-x scroll left top #FFFFFF; font-family: Arial,Tahoma,Georgia,Verdana,Simsun,Helvetica,"Microsoft YaHei",Mingliu; font-size: 14px; line-height: 22px; } #btn_login { background: url("qrc:/images/btn.png") repeat-x scroll left top #FFFFFF; }