How to get selected row index in JSF datatable?

Question

I have a databale on index.xhtml

Answer 1

What you can do is to use the [getRowData()][1] method on the Java bean to directly get the object located on the line that hosts the button on which the user clicked.

An example of code:

public void editBook(ActionEvent evt) {
    // We get the table object
    HtmlDataTable table = getParentDatatable((UIComponent) evt.getSource());
    // We get the object on the selected line.
    Object o = table.getRowData();
    // Eventually, if you need the index of the line, simply do:
    int index = table.getRowIndex();
    // ...
}

// Method to get the HtmlDataTable.
private HtmlDataTable getParentDatatable(UIComponent compo) {
    if (compo == null) {
        return null;
    }
    if (compo instanceof HtmlDataTable) {
        return (HtmlDataTable) compo;
    }
    return getParentDataTable(compo.getParent());
}

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Edit

The JSF code now looks like:

In addition, do not forget to change the signature of editBook() method, by setting a javax.faces.event.ActionEvent argument.