1.js

  alight.filters.throttle = {
    data: {
      delay: 0,
      to: null,
      scope: null
    }
    init: function(delay, scope) {
      data.delay = Number(delay);
      data.to = null;
      data.scope = scope;
    },
    onChange: function(value) {
      if (data.to) {
        clearTimeout(data.to);
      }
      data.to = setTimeout(function() {
        data.to = null;
        data.setValue(value);
        data.scope.$scan();
      }, data.delay);
    }
  };