gistfile1.js

YUI.add('autocomplete-jeremy', function(Y) {

var Plugin = Y.Plugin;

function ACListPlugin(config) {
    config.inputNode = config.host;

    // Render by default.
    if (!config.render && config.render !== false) {
      config.render = true;
    }

    Y.before(this._bindPrompt, this, 'bindUI');

    ACListPlugin.superclass.constructor.apply(this, arguments);
}

Y.extend(ACListPlugin, Y.AutoCompleteList, {
    _bindPrompt: function () {
        this.get('inputNode').on('focus', this._showLocationPrompt);
    },

    _showLocationPrompt: function (e) {
        var inputNode = e.target;

        if (inputNode.get('value') === '') {
            this.get('listNode').setContent('<li>Please type the name of your city.</li>');
            this.show();
        }
    }
}, {
    NAME      : 'autocompleteListPlugin',
    NS        : 'ac',
    CSS_PREFIX: Y.ClassNameManager.getClassName('aclist')
});

Plugin.AutoComplete     = ACListPlugin;
Plugin.AutoCompleteList = ACListPlugin;

}, '@VERSION@', {requires:['autocomplete-list', 'node-pluginhost']});