waitForCondition を使う

waitForCondition(script, timeout)
Arguments:

    * script - the JavaScript snippet to run
    * timeout - a timeout in milliseconds, after which this command will return with an error

停止条件は activeRequestCount で判定する。

|caption=例：PrototypeでAjaxリクエストを待つ
|
|コマンド,対象,値
|
|click,foo_button,
|waitForCondition,selenium.browserbot.getCurrentWindow().Ajax.activeRequestCount == 0, 5000

|caption=例：jQueryでAjaxリクエストを待つ
|
|コマンド,対象,値
|
|click,foo_button,
|waitForCondition,selenium.browserbot.getCurrentWindow().jQuery.active == 0, 5000

参考

• http://d.hatena.ne.jp/cinquanta/20090501/1241675577
• http://codelevy.com/2007/11/05/selenium-and-ajax-requests