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QWebView blank screen

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  • N Offline
    N Offline
    nicholaslee
    wrote on last edited by
    #3

    Nope, I just tested it again.

    It works from a push button though. But I would want it to load in the window.

    jsulmJ 1 Reply Last reply
    0
    • N nicholaslee

      Nope, I just tested it again.

      It works from a push button though. But I would want it to load in the window.

      jsulmJ Offline
      jsulmJ Offline
      jsulm
      Lifetime Qt Champion
      wrote on last edited by
      #4

      @nicholaslee "But I would want it to load in the window." - what do you mean? Where in your code do you load it?

      https://forum.qt.io/topic/113070/qt-code-of-conduct

      1 Reply Last reply
      0
      • N Offline
        N Offline
        nicholaslee
        wrote on last edited by
        #5

        0_1531139044328_Forum question.PNG

        I load it in this ui's (timetable) tab.
        It gives me a blank screen.

        jsulmJ 1 Reply Last reply
        0
        • N nicholaslee

          0_1531139044328_Forum question.PNG

          I load it in this ui's (timetable) tab.
          It gives me a blank screen.

          jsulmJ Offline
          jsulmJ Offline
          jsulm
          Lifetime Qt Champion
          wrote on last edited by
          #6

          @nicholaslee What I mean is: where do you execute this line

          ui->webView_2->load(QUrl("https://nusmods.com/timetable/sem-1"));
          

          ?

          https://forum.qt.io/topic/113070/qt-code-of-conduct

          1 Reply Last reply
          0
          • N Offline
            N Offline
            nicholaslee
            wrote on last edited by
            #7

            It is in my mainwindow.cpp in the function after setupUI

            jsulmJ 1 Reply Last reply
            0
            • N nicholaslee

              It is in my mainwindow.cpp in the function after setupUI

              jsulmJ Offline
              jsulmJ Offline
              jsulm
              Lifetime Qt Champion
              wrote on last edited by
              #8

              @nicholaslee Can you show the code?
              Also, you said it works if you press a buttons: do you execute exactly the same line when the button is pressed?

              https://forum.qt.io/topic/113070/qt-code-of-conduct

              1 Reply Last reply
              0
              • N Offline
                N Offline
                nicholaslee
                wrote on last edited by
                #9
                #include "mainwindow.h"
                #include "ui_mainwindow.h"
                #include <QString>
                #include <QWebView>
                #include <QUrl>
                #include <QDesktopServices>
                
                MainWindow::MainWindow(QWidget *parent) :
                    QMainWindow(parent),
                    ui(new Ui::MainWindow)
                {
                    ui->setupUi(this);
                
                    QString link = "https://nusmods.com/timetable/sem-1";
                    ui->webView->load(QUrl(link));
                }
                
                MainWindow::~MainWindow()
                {
                    delete ui;
                }
                
                void MainWindow::on_pushButton_clicked()
                {
                    QString link = "https://nusmods.com/timetable/sem-1";
                    QDesktopServices::openUrl(QUrl(link));
                }
                

                Yes, its the same. All other websites work for webview

                jsulmJ JonBJ 2 Replies Last reply
                0
                • N nicholaslee
                  #include "mainwindow.h"
                  #include "ui_mainwindow.h"
                  #include <QString>
                  #include <QWebView>
                  #include <QUrl>
                  #include <QDesktopServices>
                  
                  MainWindow::MainWindow(QWidget *parent) :
                      QMainWindow(parent),
                      ui(new Ui::MainWindow)
                  {
                      ui->setupUi(this);
                  
                      QString link = "https://nusmods.com/timetable/sem-1";
                      ui->webView->load(QUrl(link));
                  }
                  
                  MainWindow::~MainWindow()
                  {
                      delete ui;
                  }
                  
                  void MainWindow::on_pushButton_clicked()
                  {
                      QString link = "https://nusmods.com/timetable/sem-1";
                      QDesktopServices::openUrl(QUrl(link));
                  }
                  

                  Yes, its the same. All other websites work for webview

                  jsulmJ Offline
                  jsulmJ Offline
                  jsulm
                  Lifetime Qt Champion
                  wrote on last edited by
                  #10

                  @nicholaslee OK, you're loading inside MainWindow constructor - I'm not sure this is the problem as MainWindow is being constructed at that time. You can try to use http://doc.qt.io/qt-5/qtimer.html#singleShot-4 to delay the loading a bit.

                  https://forum.qt.io/topic/113070/qt-code-of-conduct

                  1 Reply Last reply
                  0
                  • N nicholaslee
                    #include "mainwindow.h"
                    #include "ui_mainwindow.h"
                    #include <QString>
                    #include <QWebView>
                    #include <QUrl>
                    #include <QDesktopServices>
                    
                    MainWindow::MainWindow(QWidget *parent) :
                        QMainWindow(parent),
                        ui(new Ui::MainWindow)
                    {
                        ui->setupUi(this);
                    
                        QString link = "https://nusmods.com/timetable/sem-1";
                        ui->webView->load(QUrl(link));
                    }
                    
                    MainWindow::~MainWindow()
                    {
                        delete ui;
                    }
                    
                    void MainWindow::on_pushButton_clicked()
                    {
                        QString link = "https://nusmods.com/timetable/sem-1";
                        QDesktopServices::openUrl(QUrl(link));
                    }
                    

                    Yes, its the same. All other websites work for webview

                    JonBJ Offline
                    JonBJ Offline
                    JonB
                    wrote on last edited by
                    #11

                    @nicholaslee
                    I don't know but: load https://nusmods.com/timetable/sem-1 into a web browser and look at the source. The page generated does not contain literal HTML for the view; it's all generated in JavaScript. Is this the root of the problem?

                    1 Reply Last reply
                    0
                    • N Offline
                      N Offline
                      nicholaslee
                      wrote on last edited by
                      #12

                      @JonB Yes, I think so, im not totally sure how webview works. How would I load the page if its generated in JavaScript?

                      jsulmJ 1 Reply Last reply
                      0
                      • N nicholaslee

                        @JonB Yes, I think so, im not totally sure how webview works. How would I load the page if its generated in JavaScript?

                        jsulmJ Offline
                        jsulmJ Offline
                        jsulm
                        Lifetime Qt Champion
                        wrote on last edited by
                        #13

                        @nicholaslee Didn't you say that same page is loading fine when you press the button?

                        https://forum.qt.io/topic/113070/qt-code-of-conduct

                        1 Reply Last reply
                        0
                        • N Offline
                          N Offline
                          nicholaslee
                          wrote on last edited by
                          #14

                          @jsulm yes the button will open the browser and navigate to the URL.

                          But webview is just displaying a blank screen. Is there anyway to view it?

                          JonBJ 1 Reply Last reply
                          0
                          • N nicholaslee

                            @jsulm yes the button will open the browser and navigate to the URL.

                            But webview is just displaying a blank screen. Is there anyway to view it?

                            JonBJ Offline
                            JonBJ Offline
                            JonB
                            wrote on last edited by
                            #15

                            @nicholaslee
                            Put in a slot for http://doc.qt.io/archives/qt-4.8/qwebview.html#loadFinished. Check you do get there, and the value of ok.

                            1 Reply Last reply
                            0
                            • N Offline
                              N Offline
                              nicholaslee
                              wrote on last edited by
                              #16
                              MainWindow::MainWindow(QWidget *parent) :
                                  QMainWindow(parent),
                                  ui(new Ui::MainWindow)
                              {
                                  ui->setupUi(this);
                              
                                  QString link = "https://nusmods.com/timetable/sem-1";
                                  ui->webView->load(QUrl(link));
                              
                                  void QWebView::loadFinished(bool ok);
                              }
                              

                              @JonB sorry im still new to slots, do I just put it in like this?

                              It's giving me an error "invalid use of qualified-name 'QWebView::loadFinished"

                              jsulmJ 1 Reply Last reply
                              0
                              • N nicholaslee
                                MainWindow::MainWindow(QWidget *parent) :
                                    QMainWindow(parent),
                                    ui(new Ui::MainWindow)
                                {
                                    ui->setupUi(this);
                                
                                    QString link = "https://nusmods.com/timetable/sem-1";
                                    ui->webView->load(QUrl(link));
                                
                                    void QWebView::loadFinished(bool ok);
                                }
                                

                                @JonB sorry im still new to slots, do I just put it in like this?

                                It's giving me an error "invalid use of qualified-name 'QWebView::loadFinished"

                                jsulmJ Offline
                                jsulmJ Offline
                                jsulm
                                Lifetime Qt Champion
                                wrote on last edited by
                                #17

                                @nicholaslee said in QWebView blank screen:

                                void QWebView::loadFinished(bool ok);

                                This declares a function!
                                Please read http://doc.qt.io/qt-5/signalsandslots.html
                                You need to do

                                MainWindow::MainWindow(QWidget *parent) :
                                    QMainWindow(parent),
                                    ui(new Ui::MainWindow)
                                {
                                    ui->setupUi(this);
                                
                                    QString link = "https://nusmods.com/timetable/sem-1";
                                    ui->webView->load(QUrl(link));
                                
                                    connect(ui->webView, &QWebView::loadFinished, this, &MainWindow::handleLoadFinished);
                                }
                                
                                void MainWindow::handleLoadFinished(bool ok)
                                {
                                ...
                                }
                                

                                https://forum.qt.io/topic/113070/qt-code-of-conduct

                                1 Reply Last reply
                                2
                                • N Offline
                                  N Offline
                                  nicholaslee
                                  wrote on last edited by
                                  #18
                                  MainWindow::MainWindow(QWidget *parent) :
                                      QMainWindow(parent),
                                      ui(new Ui::MainWindow)
                                  {
                                      ui->setupUi(this);
                                  
                                      QString link = "https://nusmods.com/timetable/sem-1";
                                      ui->webView->load(QUrl(link));
                                  
                                      connect(ui->webView, &QWebView::loadFinished, this, &MainWindow::handleLoadFinished);
                                  
                                  }
                                  
                                  void MainWindow::handleLoadFinished(bool ok){
                                  
                                      qDebug() << QString("Loaded");
                                  }
                                  

                                  @jsulm @JonB
                                  Ive put in a slot and yes it prints out loaded but the webview is not showing anything. Btw thanks for the help!

                                  JonBJ 1 Reply Last reply
                                  0
                                  • N nicholaslee
                                    MainWindow::MainWindow(QWidget *parent) :
                                        QMainWindow(parent),
                                        ui(new Ui::MainWindow)
                                    {
                                        ui->setupUi(this);
                                    
                                        QString link = "https://nusmods.com/timetable/sem-1";
                                        ui->webView->load(QUrl(link));
                                    
                                        connect(ui->webView, &QWebView::loadFinished, this, &MainWindow::handleLoadFinished);
                                    
                                    }
                                    
                                    void MainWindow::handleLoadFinished(bool ok){
                                    
                                        qDebug() << QString("Loaded");
                                    }
                                    

                                    @jsulm @JonB
                                    Ive put in a slot and yes it prints out loaded but the webview is not showing anything. Btw thanks for the help!

                                    JonBJ Offline
                                    JonBJ Offline
                                    JonB
                                    wrote on last edited by
                                    #19

                                    @nicholaslee
                                    You need to add qDebug() << ok; there, we need to know what value ok is being passed as.

                                    1 Reply Last reply
                                    1
                                    • N Offline
                                      N Offline
                                      nicholaslee
                                      wrote on last edited by
                                      #20

                                      The value is passed as a 'true'

                                      JonBJ 1 Reply Last reply
                                      0
                                      • N nicholaslee

                                        The value is passed as a 'true'

                                        JonBJ Offline
                                        JonBJ Offline
                                        JonB
                                        wrote on last edited by
                                        #21

                                        @nicholaslee
                                        Then, fortunately or unfortunately, we've sent you down a wild goose chase, insofar as QWebView confirms that it has successfully completed loading the content. But it's good to know!

                                        Then I can only guess/suggest as per earlier that (assuming you say it is not a https or redirection issue) the web kit is having problems with the JavaScript content? Check the actual content received in the QWebPage/QWebFrame to verify it's what you see in a working browser, and see if there are any signals received indicating it's having problems with the content?

                                        1 Reply Last reply
                                        0
                                        • A Offline
                                          A Offline
                                          agarny
                                          wrote on last edited by
                                          #22

                                          @nicholaslee, you apparently solved your problem (since this is labelled "SOLVED"), but I cannot see what you had to do, if anything, to solve it. Would you mind sharing your findings, if any? (Yes, I am having the same problem with a JavaScript-generated page. I have yet to fully investigate the issue though.)

                                          1 Reply Last reply
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