save only one fontFamilyName in a dropdownlist.

Hi @raldrald, one possible solution could be to collect only the unique font family names. Try this way:

// Create a new dialog
var dialog = new Window("dialog", "Choose a Font");

// Add a dropdown list for font family
var fontFamilyDropdown = dialog.add("dropdownlist", undefined, []);
fontFamilyDropdown.size = [200, 30];

// Add a dropdown list for font style
var fontStyleDropdown = dialog.add("dropdownlist", undefined, []);
fontStyleDropdown.size = [200, 30];

// Populate the font family dropdown list with all font families
var allfonts = app.fonts.everyItem().getElements();

// gather only unique font family names
var allFontFamilies = [],
    unique = {};

for (var i = 0; i < allfonts.length; i++) {
    if (true !== unique[allfonts[i].fontFamily]) {
        allFontFamilies.push(allfonts[i].fontFamily);
        unique[allfonts[i].fontFamily] = true;
    }
}

for (var i = 0; i < allFontFamilies.length; i++) {
    fontFamilyDropdown.add("item", allFontFamilies[i]);
}

// Set the first item as the default selection
fontFamilyDropdown.selection = 0;

// Function to update the font style dropdown based on the selected font family
function updateFontStyleDropdown() {
    fontStyleDropdown.removeAll();
    var selectedFontFamily = fontFamilyDropdown.selection.text;
    var fontStyles = [];
    for (var i = 0; i < allfonts.length; i++) {
        if (allfonts[i].fontFamily === selectedFontFamily) {
            fontStyles.push(allfonts[i].fontStyleName);
        }
    }
    for (var j = 0; j < fontStyles.length; j++) {
        fontStyleDropdown.add("item", fontStyles[j]);
    }
    fontStyleDropdown.selection = 0;
}

// Update the font style dropdown when a new font family is selected
fontFamilyDropdown.onChange = updateFontStyleDropdown;

// Add a button to close the dialog
dialog.add("button", undefined, "OK");

// Initial population of font style dropdown
updateFontStyleDropdown();

// Show the dialog
dialog.show();

// Get the selected font family and style
var selectedFontFamily = fontFamilyDropdown.selection.text;
var selectedFontStyle = fontStyleDropdown.selection.text;
alert("You selected: " + selectedFontFamily + " - " + selectedFontStyle);

I only changed a little section where I wrote "gather only unique font family names" and the next approx  12 lines.

- Mark