Create custom font filter

Sounds like a very useful PlugIn. I searched the SDK, I didn't see anything obvious. I wonder if the way document fonts are handled, might be a clue.

P.

The best I could come up with is to give a dropdown list of fonts allowed - select the text frame - run the script - and select the font.

It's jsx - but not really sure how else to go about it - just an idea.

// Define an array of allowed font names
var allowedFonts = ["Arial", "Helvetica", "Times New Roman", "Verdana"];

// Function to create and display a dialog box with dropdowns for font selection
function showDialog() {
    // Create a new dialog box
    var dialog = app.dialogs.add({ name: "Font Selector" });
    
    // Create a dialog column
    var dialogColumn = dialog.dialogColumns.add();
    
    // Create a dropdown control for font selection
    var fontDropdown = dialogColumn.dropdowns.add({
        stringList: allowedFonts
    });
    
    // Display the dialog box
    var result = dialog.show();
    
    // Check if the user clicked OK
    if (result == true) {
        // Get the selected font from the dropdown
        var selectedFont = fontDropdown.stringList[fontDropdown.selectedIndex];
        
        // Apply the selected font to the text
        applyFont(selectedFont);
    }
    
    // Close the dialog box
    dialog.destroy();
}

// Function to apply the selected font to a text frame
function applyFont(fontName) {
    // Check if there is a text frame selected
    if (app.selection.length > 0 && app.selection[0] instanceof TextFrame) {
        // Apply the font to the text frame
        app.selection[0].texts[0].appliedFont = app.fonts.itemByName(fontName);
    } else {
        // If no text frame is selected, display an error message
        alert("Please select a text frame before applying the font.");
    }
}

// Call the function to display the dialog box
showDialog();

You mean built in UI dropdowns?

If you are building your own tool - why not create your own dropdown with a "restricted" list of fonts.