Calling Javascript using UIWebView

Question

I am trying to call a javascript in a html page using the function -

View did load function
{

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDo         


        

Answer 1

To clarify a little bit more.

.h - implement the UIWebViewDelegate

@interface YourViewController : UIViewController <UIWebViewDelegate>
@property (weak, nonatomic) IBOutlet UIWebView *webView;
@end

.m

- (void)viewDidLoad
{
    [super viewDidLoad];

    NSString *path = @"http://www.google.com";
    [_webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:path]]];
    _webView.delegate = self; //Set the webviews delegate to this
}

- (void) webViewDidFinishLoad:(UIWebView *)webView
{
    //Execute javascript method or pure javascript if needed
    [_webView stringByEvaluatingJavaScriptFromString:@"methodName();"];
}

You could also assign the delegate from storyboard instead of doing it in the code.

Answer 2

Simple: You try to execute the JS function from Objective-C before the page even has been loaded.

Implement the UIWebView's delegate method webViewDidFinishLoad: in your UIViewController and in there you call [graphView stringByEvaluatingJavaScriptFromString:@"methodName()"]; to make sure the function gets called after the page has been loaded.