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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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qtcreatorqstringlistline editindexof
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  • 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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