Question

I try to click button on just opened page, but get TypeError: Cannot read property 'body' of undefined

var target = window.open("link");
target.document.body.getElementsByClassName("button class").item().click()

Could you please help?

Answer 1

Depending on what "link" is (at face value it is a page or servlet sibling to the main URL, but named link– however I suspect you are using it as a placeholder for something else) your main page may not have permission to access the document object, depending on the security policy as applied by the browser. For instance, you would see that error message normally if link was replaced by a URL with a different domain from that of the main page.