QComboBox - set selected item based on the item s data

Question

What would be the best way of selecting an item in a QT combo box out of a predefined list of enum based unique values   In the past I have become accustomed to  NET s style of selection where the item can be selected by setting the selected property to the item s value you wish to select   cboExample SelectedValue   2    Is there anyway to do this with QT based on the item s data  if the data is a C   enumeration

User · Answer

If you know the text in the combo box that you want to select, just use the setCurrentText() method to select that item.

ui->comboBox->setCurrentText("choice 2");

From the Qt 5.7 documentation

The setter setCurrentText() simply calls setEditText() if the combo box is editable. Otherwise, if there is a matching text in the list, currentIndex is set to the corresponding index.

So as long as the combo box is not editable, the text specified in the function call will be selected in the combo box.

Reference: http://doc.qt.io/qt-5/qcombobox.html#currentText-prop

User · Answer

You can also have a look at the method findText const QString  amp  text  from QComboBox  it returns the index of the element which contains the given text   -1 if not found   The advantage of using this method is that you don t need to set the second parameter when you add an item   Here is a little example       Create the comboBox    QComboBox     comboBox   new QComboBox      Create the ComboBox elements list  here we use QString     QList lt QString gt  stringsList  stringsList append  Text1    stringsList append  Text3    stringsList append  Text4    stringsList append  Text2    stringsList append  Text5        Populate the comboBox     comboBox- gt addItems stringsList       Create the label    QLabel  label   new QLabel      Search for  Text2  text    int index    comboBox- gt findText  Text2    if  index    -1       label- gt setText  Text2 not found      else     label- gt setText QString  Text2 s index is                        append QString  number  comboBox- gt findText  Text2           setup layout    QVBoxLayout  layout   new QVBoxLayout this   layout- gt addWidget  comboBox   layout- gt addWidget label

User · Answer

You lookup the value of the data with findData   and then use setCurrentIndex    QComboBox  combo   new QComboBox  combo- gt addItem  100  100 0         2nd parameter can be any Qt type combo- gt addItem        float value 100 0  int index   combo- gt findData value   if   index    -1        -1 for not found    combo- gt setCurrentIndex index

[c++] QComboBox - set selected item based on the item's data

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