Getting Started with PhantomJS

Capturing alert messages

It is common for most web developers to display a message using the JavaScript alert message box. These are pop-up messages that are displayed on top of the browser. Since we are running a headless browser, these pop ups will not be seen, but rest assured that they are triggered. We can still capture these events using the webpage onAlert().

var page = require('webpage').create();

page.onAlert = function(msg) {
  console.log(msg);
};

In the preceding code, we had overridden the onAlert callback after we created an instance of the web page module. The function receives a single parameter, which contains the message intended to be displayed in the pop-up message box. The function process that we provided here will be used by ...