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Problem This is in response to pprunner's post titled "grab focus in the gtkentry wich is empty".
Suppose you have set up some GtkEntry fields. When the user clicks the Submit button, you would like to check for any empty fields. If a field is empty, you want to set the focus back on the empty field as shown below:
Solution
- When the user click the Submit button, we loop through all fields and check if there are any empty ones.
- If a field is empty, we first display a popup alert, then use GtkWidget::grab_focus() to set the focus on the empty field.
Sample Code 1
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| <?php
$window = new GtkWindow();
$window->set_size_request(400, 240);
$window->connect_simple('destroy', array('Gtk','main_quit'));
$window->add($vbox = new GtkVBox());
// display title
$title = new GtkLabel("Grab Focus on empty GtkEntry fields");
$title->modify_font(new PangoFontDescription("Times New Roman Italic 10"));
$title->modify_fg(Gtk::STATE_NORMAL, GdkColor::parse("#0000ff"));
$title->set_size_request(-1, 40);
$vbox->pack_start($title, 0, 0);
$fields = array('Item number', 'Item Description', 'Unit price', 'Quantity');
$field_size = array(120, 200, 80, 80);
$entry = array(); // to store the text entries
$table = new GtkTable();
display_table($table, $fields, $field_size); // display the table
$vbox->pack_start($table);
function display_table($table, $fields, $field_size) {
global $entry;
$row = 0;
foreach ($fields as $field) {
$label = new GtkLabel(" $field: ");
$alignment = new GtkAlignment(1, .5, 0, 0);
$alignment->add($label);
$table->attach($alignment, 0, 1, $row, $row+1,
Gtk::FILL, Gtk::SHRINK, 0, 0);
$entry[$row] = new GtkEntry();
$alignment = new GtkAlignment(0, .5, 0, 0);
$alignment->add($entry[$row]);
$entry[$row]->set_size_request($field_size[$row], -1);
$table->attach($alignment, 1, 2, $row, $row+1);
++$row;
}
}
// create a submit button
$button = new GtkButton('Submit');
$button->set_size_request(60, 28);
$button->connect('clicked', 'on_click');
$row = count($fields);
$alignment = new GtkAlignment(0, 0.5, 0, 0);
$alignment->add($button);
$table->attach($alignment, 1, 2, $row, $row+1);
$window->show_all();
Gtk::main();
function on_click($button) {
global $fields, $entry;
// validate
$i=0;
foreach($fields as $field) {
$val = $entry[$i]->get_text();
if ($val=='') { // note 1
alert("Please enter $fields[$i]"); // note 2
$entry[$i]->grab_focus(); // note 3
return;
}
++$i;
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- Note that this is only 70% of the sample code. You have to be a registered member to see the entire sample code. Please login or register.
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Explanation We make use of the code from How to align GtkEntry fields - Part 2? to set up the GtkEntry fields.
We also make use of the code from How to display a popup alert for required fields - Part 1? to display the popup alert.
What's new here:
- Check for empty fields.
- Display an popup alert.
- Set focus back on the emtpy field.
Related Links
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