Programmatically open dropdown or combobox on UIWebView

AppDelegate.m

//
//  AppDelegate.m
//  DOMTest
//
//  Created by Douglas Fischer on 1/28/14.
//  Copyright (c) 2014 Abacomm Brasil. All rights reserved.
//

#import "AppDelegate.h"
#import "TestViewController.h"

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    self.window.backgroundColor = [UIColor whiteColor];
    
    TestViewController *testViewController = [[TestViewController alloc] init];
    UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:testViewController];
    self.window.rootViewController = navigationController;

    [self.window makeKeyAndVisible];
    return YES;
}

@end

TestViewController.h

@interface TestViewController : UIViewController
@end

TestViewController.m

#import "TestViewController.h"

@interface TestViewController ()

@property (nonatomic, strong) UIWebView *webView;

- (void)initUIElements;
- (void)leftBarButtonTapped;

@end

@implementation TestViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    [self initUIElements];
}

- (void)initUIElements {
    _webView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
    _webView.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
    _webView.keyboardDisplayRequiresUserAction = NO;
    [self.view addSubview:_webView];
    
    UIBarButtonItem *leftBarButton = [[UIBarButtonItem alloc] initWithTitle:@"Simulate" style:UIBarButtonItemStylePlain target:self action:@selector(leftBarButtonTapped)];
    self.navigationItem.leftBarButtonItem = leftBarButton;
}

- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];
    
    NSURL *url = [NSURL URLWithString:@"https://docs.google.com/forms/d/1bQPAK6TpekQGXiY6NjtUMnJFXtVpzW74gFoJ25wgnuk/viewform"];
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    [_webView loadRequest:request];
}


#pragma mark - Button Handling

- (void)leftBarButtonTapped {
    NSString *result = [_webView stringByEvaluatingJavaScriptFromString:@"document.forms[0].elements[0].focus()"];
    NSLog(@"[%@]", result);
}

@end