example2.js

var root_url = "http://www.mailinator.com/";

// Create new WebPage object for browsing
var page = new WebPage();

// Repeat console.log messages from PhantomJS
page.onConsoleMessage = function (msg) {
    console.log(msg);
};

// Callback for each page onload
page.onLoadFinished = function (msg) {
    // Get URL of finished page
    var url = page.evaluate(function () { return window.location.toString(); });

    // Handle original URL
    if (url === root_url) {
        page.evaluate(function () {
            // Populate login form and submit
            document.getElementById("check_inbox_field").value = "phantomjs";
            document.forms['search'].submit();
        });
    }
    // Check for inbox URL
    else if (url.indexOf("maildir") !== -1) {
        page.evaluate(function () {
            // Find the "Alternate Email" font tag
            var smalls = document.getElementsByClassName("small");
            for (var i=0; i<smalls.length; i++) {
                var fonts = smalls[i].getElementsByTagName("font");
                if (fonts.length) {
                    // Log when we find it
                    console.log("Alternate Email:", fonts[0].innerHTML);
                    break;
                }
            }
        });   
        // Exit after the inbox loads
        phantom.exit();
    }
};

// Browse to url
page.open(root_url);