Automated survey submitter using PhantomJS

run.fish

#!/bin/fish

phantomjs --ssl-protocol=any survey.js 100
for i in (seq 0 99)
	diff correct.png cap$i.png
end
rm *.png

survey.js

var system = require('system');
var args = system.args;

var succeed = 0, failed = 0, N = 50;

if (args.length === 1) {
    console.log("run with count.");
    phantom.exit();
} else {
    N = parseInt(args[1]);
}

function runTask(k) {
    var page = require('webpage').create();
    page.onConsoleMessage = function(msg) {
        console.log("Task " + k + ": " + msg);
    };

    page.open('https://www.wenjuan.com/s/QBjuQz/', function(status) {
        console.log("Task " + k + " status: " + status);
        if(status === "success") {
            window.setTimeout(function () {
                console.log("Task " + k + ": begin evaluating script...")
                var result = page.evaluateAsync(function () {
                    var questions = $(".question");
                    if (!questions.length) {
                        console.log("Error: no question detected");
                        return false;
                    }
                    var select = function (choices, n) {
                        console.log("choices: ", choices.length);
                        var p = 0;
                        for (var i = 0; i < n; i++) {
                            var t;
                            do {
                                t = Math.floor(Math.random() * choices.length);
                            } while (p & (1 << t));
                            console.log("select " + t);
                            $(choices.get(t)).click();
                            p |= 1 << t;
                        }
                    };

                    questions.each(function (i) {
                        var e = $(this),
                            qt = e.attr("questiontype");
                        console.log("question " + i);
                        switch (qt) {
                            case "2":
                                var choices = $("#" + e.attr("id") + " .icheckbox_div:not(:has(.option_open)) .jqTransformRadio");
                                select(choices, 1);
                                break;
                            case "3":
                                var choices = $("#" + e.attr("id") + " .icheckbox_div:not(:has(.option_open)) .jqTransformCheckbox");
                                select(choices, 2);
                                break;
                            default:
                                console.log("Unknown question type: " + qt);
                                return false;
                        }
                    });
                    $("#next_button").click();
                    return true;
                });
                if (result === false) {
                    failed += 1;
                    console.log("Task " + k + ": failed.");
                    return ;
                }
                window.setTimeout(function () {
                    console.log("Task " + k + ": completed.");
                    page.render("cap" + k + ".png");
                    succeed += 1;
                }, 3000);
            }, 500);
        } else {
            failed += 1;
        }
    });
}

for (var k = 0; k < N; k++) {
    console.log("SPAWNING TASK " + k);
    window.setTimeout((function (t) {
        return function () { runTask(t); };
    })(k), 1500 * k);
}
window.setInterval(function () {
    if (succeed + failed == N) {
        console.log("completed " + (succeed + failed) + " (" + succeed + "," + failed + ")");
        phantom.exit();
    } else {
        console.log("running " + (succeed + failed) + " (" + succeed + "," + failed + ")");
    }
}, 5000);