GUI-DAT is a controller library for JavaScript.

var controllableObject = 
	{	
		numberProperty: 20,
		anotherNumberProperty: 0,
		textProperty: "a string",
		booleanProperty: false,
		functionProperty: function() {
			alert("I am a function!");
		}
	};

window.onload = function() {

	GUI.start();
	
	// Creates a number box
	GUI.add(controllableObject, "numberProperty");
	
	// Creates a slider (min, max)
	GUI.add(controllableObject, "anotherNumberProperty", -100, 100);
	
	// Creates a text field
	GUI.add(controllableObject, "textProperty");
	
	// Creates a checkbox
	GUI.add(controllableObject, "booleanProperty");
	
	// Creates a button
	GUI.add(controllableObject, "functionProperty");

}