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Often happens to have the need of change a part of the page with ajax.

Hello ppl. Even though i have a small experience with yii I though of writing this to help people which want to do something similar.

This example uses a MySQL DB with a table named tree with the fields id, name, and parent_id. The parent_id will be NULL for root elements. The SQL is kept simple (no autoinc, no FK, etc).

The easiest way to update content in AJAX is to use the renderPartial method.

With yii you're able to create ajax requests and updates easily. But most times you always want to show a loading indicatior to your user.

Often you'll need a form with two dropdowns, and one dropdown's values will be dependent on the value of the other dropdown. Using Yii's built-in AJAX functionality you can create such a dropdown.