Selenium - alert and confirm in the page's onload() event

Selenium does NOT support _javascript_ alerts that are generated in a page's onload() event handler. Selenium does NOT support _javascript_ confirmations that are generated in a page's onload() event handler.

You may have some alert in the login page to display some alert on invalid username and password. When you want to automate the test cases on those pages, you need to add some javascript code on those pages before displaying the alert or confirm. These following lines makes the selenium to capture the alert or confirm messages.

var browserbot = parent.selenium.browserbot;
if (browserbot) {
browserbot.modifyWindowToRecordPopUpDialogs(window, browserbot);
}
alert("Alert message after those selenium workaround js snippet");