pixel-editor/js/_presets.js

//presets
var presets = {
    'Gameboy Color': {
        width: 240,
        height: 203,
        palette: 'Gameboy Color'
    },
    'PICO-8': {
        width: 128,
        height: 128,
        palette: 'PICO-8'
    },
    'Commodore 64': {
        width: 40,
        height: 80,
        palette: 'Commodore 64'
    }
};

//populate preset list in new pixel menu
Object.keys(presets).forEach(function(presetName,index) {

    var presetsMenu = document.getElementById('preset-menu');

    //create button
    var button = document.createElement('button');
    button.appendChild(document.createTextNode(presetName));

    //insert new element
    presetsMenu.appendChild(button);

    //add click event listener
    on('click', button, function() {

        //change dimentions on new pixel form
        setValue('size-width', presets[presetName].width);
        setValue('size-height', presets[presetName].height);

        //set the text of the dropdown to the newly selected preset
        setText('palette-button', presets[presetName].palette);

        //hide the dropdown menu
        deselect('preset-menu');
        deselect('preset-button');

        //set the text of the dropdown to the newly selected preset
        setText('preset-button', presetName);
    });

});

on('click', 'preset-button', function (e){
    //open or close the preset menu
    toggle('preset-button');
    toggle('preset-menu');

    //close the palette menu
    deselect('palette-button');
    deselect('palette-menu');

    //stop the click from propogating to the parent element
    e.stopPropagation();
});