Automatic form fill, random form fill, and all kind of nice things with forms. Can be used for mass user account generation on a web site, for instance.

filldata.js

exports.url = "http://test.com"; //URL of the first page of the form



exports.fillRules = [ //Each element is a new page in the form

{// First page
   // Keys must be CSS selectors
   // Values indicate how to fill the selected element
   "#inputid" : "constant string value",
   "#inputid2" : ["this", "that"], // One value will be picked at random
   "input[type='password']" : {"type":"randomstr", "length":8}, // A string of random characters
   "input.numberinput" : {"type":"randomint", "min":8, "max":18}, // A random integer between 8 and 18
},

{ // If submitting the form at the given url leads to a second form page, this second form can be filled too 
   "#email" : {"type":"composedstr", "parts":[{"select":"#name","attr":"innerHTML"}, '@', {'choice':['gmail.com', 'yahoo.co.uk']}]},
}
];

formfill-phantom.js

/*****************
Formfill
Description: fill forms through a headless browser. Works on multi-page forms.  
Author: @lovasoa
License: GPLv2
******************/

var system = require("system");
var filldata = require("./filldata");

var nbrFills = 1;
if (system.args.length > 1) {
	nbrFills = parseInt(system.args[1]);
	console.log("I will fill it "+nbrFills+' times');
}

var page = new WebPage();
page.onConsoleMessage = function() {
	console.log('Page says: ');
	console.log.apply(console, arguments);
};
page.viewportSize = {
  width: 800,
  height: 800
};

page.addVariable = function (name, value) {
	var strname = JSON.stringify(name);
	var strval = JSON.stringify(value);
	if (typeof value === "function") strval = value.toString();
	var fun = eval("(function(){return (window["+strname+"]="+strval+")})");
	return this.evaluate(fun);
}

function fillPage () {

	function randomInt(min, max) {
		return Math.floor(min + (max-min+1)*Math.random());
	}
	function randomStr(len) {
		var arr = Array(len);
		for (var i=0; i<len; i++) {
			arr[i] = String.fromCharCode(randomInt(97, 122)); // 97:'a' 122:'z'
		}
		return arr.join('');
	}

	for (var selector in formfiller_phantom_data) {
		var target = document.querySelector(selector);
		var replinfo = formfiller_phantom_data[selector];

		if (Array.isArray(replinfo)) {
			var repl = replinfo[randomInt(0, replinfo.length-1)];
		} else if (typeof replinfo === "object") {
			switch (replinfo.type) {
				case "randomstr":
					// String of random characters
					repl = randomStr(replinfo.length || randomInt(5,100));
					break;
				case "randomint":
					repl = randomInt(replinfo.min||0, replinfo.max||100);
					break;
				case "randomselect":
					// Only applicable if target is a select element. Chooses a random option
					var min = replinfo.min || 0;
					var max = (typeof replinfo.max === "number") ? replinfo.max : target.options.length-1;
					repl = target.options.item(randomInt(min, max)).value;
					break;
				case "randomemail":
					repl = randomStr(randomInt(6,20))+"@gmail.com";
					break;
				case "composedstr":
					repl = '';
					for (var i=0;i<replinfo.parts.length;i++) {
						var p = replinfo.parts[i];
						if (typeof p === "string") {
							repl += replinfo.parts[i];
						} else {
							if (p.select) {
								repl += document.querySelector(p.select)[p.attr||"value"];
							} else if (p.randint) {
								repl += randomInt(p.randint[0], p.randint[1]);
							} else if (p.choice) {
								repl += p.choice[randomInt(0,p.choice.length-1)];
							}
						}
					}
					break;
				case "attributes":
					for (a in replinfo) {
						if (a != "type") target[a] = replinfo[a];
					}
					repl = null;
					break;
				default:
					console.log("Invalid replinfo type");
			}
		} else if (typeof replinfo === "function") {
			repl = replinfo(target);
		} else {
			repl = replinfo;
		}
		if (repl !== null) target.value = repl;
	}

	//Validate the form of the last target found
	target.form.submit();
}



var i=0, inter;
function fillOnce() {

	i++;
	if (i > nbrFills) {
		phantom.exit();
	}
	clearInterval(inter);

	page.open(filldata.url, function() {
		var curPage = -1;
		var curUrl = '';

		inter = setInterval(function(){
			if ( !page.loading && curUrl != page.frameUrl ) {
				curUrl = page.frameUrl;

				curPage ++;
				if (curPage === filldata.fillRules.length) {
					page.zoomFactor = 0.4;
					page.render("capture-finale-"+i+".pdf");
					page.clearCookies();
					fillOnce();
					return;
				}

				console.log("Filling " + page.frameUrl);
				page.addVariable("formfiller_phantom_data", filldata.fillRules[curPage]);
				page.evaluate(fillPage);
			};
		}, 50);
	});
}

fillOnce();