QComboBox: how to get selected value?

[Ivan Khromov]

Good day! I'm newbie in Qt, please, help me!
When I was writing my programs on C# 2008, there have been many ways to get the current value of the ComboBox. In Qt, I create QComboBox and insert items without using UI designer.

dataExp = new QComboBox();
codeList = new QComboBox();
apiPrivate = new QComboBox();
// items: codeList
codeList->addItem("PHP", "php");
codeList->addItem("JavaScript", "javascript");
// end of items for codeList
//items: dataExp
dataExp->addItem("Never delete", "N");
dataExp->addItem("10 Minutes", "10M");
dataExp->addItem("1 Hour", "1H");
dataExp->addItem("1 Day", "1D");
dataExp->addItem("1 Month", "1M");
// end of items for dataExp
// items: apiPrivate
apiPrivate->addItem("Public", "0");
apiPrivate->addItem("Private", "1");
// end of items for apiPrivate

dataExp = new QComboBox();
codeList = new QComboBox();
apiPrivate = new QComboBox();
// items: codeList
codeList->addItem("PHP", "php");
codeList->addItem("JavaScript", "javascript");
// end of items for codeList
//items: dataExp
dataExp->addItem("Never delete", "N");
dataExp->addItem("10 Minutes", "10M");
dataExp->addItem("1 Hour", "1H");
dataExp->addItem("1 Day", "1D");
dataExp->addItem("1 Month", "1M");
// end of items for dataExp
// items: apiPrivate
apiPrivate->addItem("Public", "0");
apiPrivate->addItem("Private", "1");
// end of items for apiPrivate

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My question: now to get value from selected item?
I try that:

private_stat = apiPrivate->itemText(apiPrivate->currentIndex());
prog_lang = codeList->itemText(codeList->currentIndex());
date_expire = dataExp->itemText(dataExp->currentIndex());

private_stat = apiPrivate->itemText(apiPrivate->currentIndex());
prog_lang = codeList->itemText(codeList->currentIndex());
date_expire = dataExp->itemText(dataExp->currentIndex());

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But returned default value
Tell me, what to do?

[Zlatomir]

You can use currentText() or you have the currentIndexChanged(...) signal (with int index or QString text parameter)

[Ivan Khromov]

I tried so:

void qpastebin::IndexChangedCode() {
    codeList->setCurrentIndex(codeList->currentIndex());
}
void qpastebin::IndexChangedExpd() {
    dataExp->setCurrentIndex(dataExp->currentIndex());
}
void qpastebin::IndexChangedPriv() {
    apiPrivate->setCurrentIndex(apiPrivate->currentIndex());
}

void qpastebin::IndexChangedCode() {
    codeList->setCurrentIndex(codeList->currentIndex());
}
void qpastebin::IndexChangedExpd() {
    dataExp->setCurrentIndex(dataExp->currentIndex());
}
void qpastebin::IndexChangedPriv() {
    apiPrivate->setCurrentIndex(apiPrivate->currentIndex());
}

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and slots:

private_stat = apiPrivate->itemData(apiPrivate->currentIndex()).toString();
prog_lang = codeList->itemData(codeList->currentIndex()).toString();
date_expire = dataExp->itemData(dataExp->currentIndex()).toString();
connect(codeList, SIGNAL(currentIndexChanged(int)), this, SLOT(IndexChangedCode()));
connect(dataExp, SIGNAL(currentIndexChanged(int)), this, SLOT(IndexChangedExpd()));
connect(apiPrivate, SIGNAL(currentIndexChanged(int)), this, SLOT(IndexChangedPriv()));

private_stat = apiPrivate->itemData(apiPrivate->currentIndex()).toString();
prog_lang = codeList->itemData(codeList->currentIndex()).toString();
date_expire = dataExp->itemData(dataExp->currentIndex()).toString();
connect(codeList, SIGNAL(currentIndexChanged(int)), this, SLOT(IndexChangedCode()));
connect(dataExp, SIGNAL(currentIndexChanged(int)), this, SLOT(IndexChangedExpd()));
connect(apiPrivate, SIGNAL(currentIndexChanged(int)), this, SLOT(IndexChangedPriv()));

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But all the same data from QComboBox only those who are selected by default ...
Please show an example would be very grateful

[Zlatomir]

Here you go, i just displayed the changing text in a QLabel:

#include <QApplication>
#include <QLabel>
#include <QComboBox>
#include <QVBoxLayout>
 
int main(int argc, char** argv) {
 
    QApplication a(argc, argv);
    QWidget w;
 
    QVBoxLayout *layout = new QVBoxLayout(&w);
    QLabel *label = new QLabel("Here you will see the selected text from ComboBox", &w);
    QComboBox *combo = new QComboBox(&w);
    layout->addWidget(label);
    layout->addWidget(combo);
    combo->addItem("First text");
    combo->addItem("Secont text");
    combo->addItem("Third text");
 
    QObject::connect(combo, SIGNAL(currentIndexChanged(QString)), label, SLOT(setText(QString)));
 
    w.show();
 
    return a.exec();
}

#include <QApplication>
#include <QLabel>
#include <QComboBox>
#include <QVBoxLayout>

int main(int argc, char** argv) {

    QApplication a(argc, argv);
    QWidget w;

    QVBoxLayout *layout = new QVBoxLayout(&w);
    QLabel *label = new QLabel("Here you will see the selected text from ComboBox", &w);
    QComboBox *combo = new QComboBox(&w);
    layout->addWidget(label);
    layout->addWidget(combo);
    combo->addItem("First text");
    combo->addItem("Secont text");
    combo->addItem("Third text");

    QObject::connect(combo, SIGNAL(currentIndexChanged(QString)), label, SLOT(setText(QString)));

    w.show();

    return a.exec();
}

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[Ivan Khromov]

Thank you! That helped!