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  4. Getting QStringList text to line edit based on a string inserted on another line edit
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Getting QStringList text to line edit based on a string inserted on another line edit

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  • M Offline
    M Offline
    mrjj
    Lifetime Qt Champion
    wrote on 18 Dec 2017, 16:37 last edited by
    #2

    Hi
    Hook up the QLine(1) textChanged() to a slot and in that slot
    call getNameIndex()

    L 1 Reply Last reply 18 Dec 2017, 16:44
    0
    • M mrjj
      18 Dec 2017, 16:37

      Hi
      Hook up the QLine(1) textChanged() to a slot and in that slot
      call getNameIndex()

      L Offline
      L Offline
      Lasith
      wrote on 18 Dec 2017, 16:44 last edited by
      #3

      @mrjj
      void MainWindow::on_name_textChanged(const QString &arg1)
      {
      getNameIndex();
      }

      I did this now but still no change :(

      M 1 Reply Last reply 18 Dec 2017, 16:52
      0
      • L Lasith
        18 Dec 2017, 16:44

        @mrjj
        void MainWindow::on_name_textChanged(const QString &arg1)
        {
        getNameIndex();
        }

        I did this now but still no change :(

        M Offline
        M Offline
        mrjj
        Lifetime Qt Champion
        wrote on 18 Dec 2017, 16:52 last edited by mrjj
        #4

        @Lasith
        did you use connect and checked the return code ?
        ahh, its via designer
        Set break point and see what happens.

        1 Reply Last reply
        0
        • L Offline
          L Offline
          Lasith
          wrote on 18 Dec 2017, 16:56 last edited by
          #5

          How to use connect and check return code?

          T M 3 Replies Last reply 18 Dec 2017, 16:59
          0
          • L Lasith
            18 Dec 2017, 16:56

            How to use connect and check return code?

            T Offline
            T Offline
            Taz742
            wrote on 18 Dec 2017, 16:59 last edited by
            #6
            This post is deleted!
            1 Reply Last reply
            0
            • L Lasith
              18 Dec 2017, 16:56

              How to use connect and check return code?

              M Offline
              M Offline
              mrjj
              Lifetime Qt Champion
              wrote on 18 Dec 2017, 16:59 last edited by mrjj
              #7

              @Lasith
              Forget about that. You use Designer so its pr auto.

              Your error is that you dont set name to compare with from LineEdit1
              sorry. you do.

              L 1 Reply Last reply 18 Dec 2017, 17:01
              0
              • L Lasith
                18 Dec 2017, 16:56

                How to use connect and check return code?

                T Offline
                T Offline
                Taz742
                wrote on 18 Dec 2017, 16:59 last edited by
                #8

                @Lasith

                #include "mainwindow.h"
                #include "ui_mainwindow.h"
                
                MainWindow::MainWindow(QWidget *parent) :
                    QMainWindow(parent),
                    ui(new Ui::MainWindow)
                {
                    ui->setupUi(this);
                
                    QObject::connect(ui->lnName, &QLineEdit::textChanged, this, [=](QString arg){
                        ui->lnIndex->setText(QString::number(this->getIndex(arg)));
                    });
                }
                
                MainWindow::~MainWindow()
                {
                    delete ui;
                }
                
                int MainWindow::getIndex(QString arg) {
                    QStringList names;
                    names << "John" << "Smith" << "Mary" <<"Anne";
                
                    for (int i = 0; i < names.size(); i++) {
                        if (names[i] == arg) {
                            return i;
                        }
                    }
                    return -1;
                }
                
                

                .h

                #ifndef MAINWINDOW_H
                #define MAINWINDOW_H
                
                #include <QMainWindow>
                
                namespace Ui {
                class MainWindow;
                }
                
                class MainWindow : public QMainWindow
                {
                    Q_OBJECT
                
                public:
                    explicit MainWindow(QWidget *parent = 0);
                    ~MainWindow();
                
                private:
                    Ui::MainWindow *ui;
                    int getIndex(QString arg);
                };
                
                #endif // MAINWINDOW_H
                
                
                1 Reply Last reply
                2
                • M mrjj
                  18 Dec 2017, 16:59

                  @Lasith
                  Forget about that. You use Designer so its pr auto.

                  Your error is that you dont set name to compare with from LineEdit1
                  sorry. you do.

                  L Offline
                  L Offline
                  Lasith
                  wrote on 18 Dec 2017, 17:01 last edited by
                  #9

                  @mrjj No I already set the Name :(

                  M 1 Reply Last reply 18 Dec 2017, 17:05
                  0
                  • L Lasith
                    18 Dec 2017, 17:01

                    @mrjj No I already set the Name :(

                    M Offline
                    M Offline
                    mrjj
                    Lifetime Qt Champion
                    wrote on 18 Dec 2017, 17:05 last edited by
                    #10

                    @Lasith
                    Yeah, sorry saw that after.
                    Use @Taz742 solution (which uses lambda and is more smooth)
                    or try this test project (that does it with your code)
                    https://www.dropbox.com/s/pozxsv4sd1sa64p/editindex.zip?dl=0

                    L 1 Reply Last reply 18 Dec 2017, 17:12
                    1
                    • M mrjj
                      18 Dec 2017, 17:05

                      @Lasith
                      Yeah, sorry saw that after.
                      Use @Taz742 solution (which uses lambda and is more smooth)
                      or try this test project (that does it with your code)
                      https://www.dropbox.com/s/pozxsv4sd1sa64p/editindex.zip?dl=0

                      L Offline
                      L Offline
                      Lasith
                      wrote on 18 Dec 2017, 17:12 last edited by
                      #11

                      @mrjj Thanx but what was the problem in my code?

                      M T 2 Replies Last reply 18 Dec 2017, 17:16
                      0
                      • L Lasith
                        18 Dec 2017, 17:12

                        @mrjj Thanx but what was the problem in my code?

                        M Offline
                        M Offline
                        mrjj
                        Lifetime Qt Champion
                        wrote on 18 Dec 2017, 17:16 last edited by mrjj
                        #12

                        @Lasith
                        Only thing wrong was you assigned an int to a QString

                        index=i; // this wont work

                        have to be
                        index=QString::number(i);

                        I also added it would say "not found" just for testing.

                        L 1 Reply Last reply 18 Dec 2017, 17:22
                        1
                        • M mrjj
                          18 Dec 2017, 17:16

                          @Lasith
                          Only thing wrong was you assigned an int to a QString

                          index=i; // this wont work

                          have to be
                          index=QString::number(i);

                          I also added it would say "not found" just for testing.

                          L Offline
                          L Offline
                          Lasith
                          wrote on 18 Dec 2017, 17:22 last edited by
                          #13

                          @mrjj Oh a silly mistake :(

                          M 1 Reply Last reply 18 Dec 2017, 17:24
                          0
                          • L Lasith
                            18 Dec 2017, 17:22

                            @mrjj Oh a silly mistake :(

                            M Offline
                            M Offline
                            mrjj
                            Lifetime Qt Champion
                            wrote on 18 Dec 2017, 17:24 last edited by
                            #14

                            @Lasith
                            Well its not that silly as i do it sometimes also - as my old string class would
                            make the int a string but QString think something else of it.

                            1 Reply Last reply
                            0
                            • L Lasith
                              18 Dec 2017, 17:12

                              @mrjj Thanx but what was the problem in my code?

                              T Offline
                              T Offline
                              Taz742
                              wrote on 18 Dec 2017, 17:28 last edited by Taz742
                              #15

                              @Lasith
                              Your problems:

                              • You only once call the returning function of the index, and in the designer. (In fact, when ui->name text changes, the function should be called every time.)

                              @Lasith said in Getting QStringList text to line edit based on a string inserted on another line edit:

                              QString index;
                              Name=ui->name->text();
                              for(int i=0;i<names.size();i++)
                              {
                              if(names[i]==Name){
                              index=i;
                              }

                              You want the string but in your cycle the 'i' of the integer. Why do not you pay attention to this(index = i)? Try compile the app? If yes, the compiler would inform you about it.

                              From your profile it seems that you are using Qt too several months. But it does not seem to be at all.

                              Do not try to conquer the peak, learn to walk first.

                              1 Reply Last reply
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                              18 Dec 2017, 17:12

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