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Forum Update on Monday, May 27th 2025

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

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qtcreatorqstringlistline editindexof
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  • mrjjM Offline
    mrjjM Offline
    mrjj
    Lifetime Qt Champion
    wrote on 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
    0
    • mrjjM mrjj

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

      L Offline
      L Offline
      Lasith
      wrote on last edited by
      #3

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

      I did this now but still no change :(

      mrjjM 1 Reply Last reply
      0
      • L Lasith

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

        I did this now but still no change :(

        mrjjM Offline
        mrjjM Offline
        mrjj
        Lifetime Qt Champion
        wrote on 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 last edited by
          #5

          How to use connect and check return code?

          Taz742T mrjjM 3 Replies Last reply
          0
          • L Lasith

            How to use connect and check return code?

            Taz742T Offline
            Taz742T Offline
            Taz742
            wrote on last edited by
            #6
            This post is deleted!
            1 Reply Last reply
            0
            • L Lasith

              How to use connect and check return code?

              mrjjM Offline
              mrjjM Offline
              mrjj
              Lifetime Qt Champion
              wrote on 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
              0
              • L Lasith

                How to use connect and check return code?

                Taz742T Offline
                Taz742T Offline
                Taz742
                wrote on 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
                • mrjjM mrjj

                  @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 last edited by
                  #9

                  @mrjj No I already set the Name :(

                  mrjjM 1 Reply Last reply
                  0
                  • L Lasith

                    @mrjj No I already set the Name :(

                    mrjjM Offline
                    mrjjM Offline
                    mrjj
                    Lifetime Qt Champion
                    wrote on 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
                    1
                    • mrjjM mrjj

                      @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 last edited by
                      #11

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

                      mrjjM Taz742T 2 Replies Last reply
                      0
                      • L Lasith

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

                        mrjjM Offline
                        mrjjM Offline
                        mrjj
                        Lifetime Qt Champion
                        wrote on 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
                        1
                        • mrjjM mrjj

                          @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 last edited by
                          #13

                          @mrjj Oh a silly mistake :(

                          mrjjM 1 Reply Last reply
                          0
                          • L Lasith

                            @mrjj Oh a silly mistake :(

                            mrjjM Offline
                            mrjjM Offline
                            mrjj
                            Lifetime Qt Champion
                            wrote on 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

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

                              Taz742T Offline
                              Taz742T Offline
                              Taz742
                              wrote on 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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