problem inserting a string into a text field

at0m87 · 02-07-2012, 07:11 AM

I have login User name and password stored in an array and wants to auto login the credentials using

Code:

stringByEvaluatingJavaScriptFromString

Code:

- (void)webViewDidFinishLoad:(UIWebView *)webView {
    
    NSString *usname = loginObj.loginUserName;
    NSString *pwd = loginObj.password;
    NSLog(@"%@, %@", username, password);
    
    //---access the 2 fields in the HTML---
   error>> [myWebView stringByEvaluatingJavaScriptFromString:@"document.getElementById('email').value='%@';", usname];
   error>> [myWebView stringByEvaluatingJavaScriptFromString:@"document.getElementById('pass').value='%@';", pwd];
}

i receive error "too many argument to methods call, expected 1, have 2"

in the debugger, the NSLog printed the correct username and password stored in my array.

Duncan C · 02-07-2012, 07:44 AM

Quote:

Originally Posted by at0m87

I have login User name and password stored in an array and wants to auto login the credentials using

Code:

stringByEvaluatingJavaScriptFromString

Code:

- (void)webViewDidFinishLoad:(UIWebView *)webView {
    
    NSString *usname = loginObj.loginUserName;
    NSString *pwd = loginObj.password;
    NSLog(@"%@, %@", username, password);
    
    //---access the 2 fields in the HTML---
   error>> [myWebView stringByEvaluatingJavaScriptFromString:@"document.getElementById('email').value='%@';", usname];
   error>> [myWebView stringByEvaluatingJavaScriptFromString:@"document.getElementById('pass').value='%@';", pwd];
}

i receive error "too many argument to methods call, expected 1, have 2"

in the debugger, the NSLog printed the correct username and password stored in my array.

The error is telling you exactly what is wrong. The method stringByEvaluatingJavaScriptFromString wants a SINGLE parameter. You are passing it 2 parameters Your quoted string, and a value that you want to be inserted into that string. You can't do that. There are specific methods like the NSString method stringWithFormat, and the NSLog function, that can take a variable number of arguments and parse a format string, but most cannot.

Break your statement into two lines:

Code:

NSString *jsString = [NSString stringWithFormat: 
  @"document.getElementById('email').value='%@';", 
  usname];
[myWebView stringByEvaluatingJavaScriptFromString: jsString];

The NSString method stringWithFormat takes a format string and a variable number of arguments and returns a string result. You can then pass the resulting string to your webVeiw's stringByEvaluatingJavaScriptFromString method.

at0m87 · 02-07-2012, 08:28 AM

Quote:

Originally Posted by Duncan C

The error is telling you exactly what is wrong. The method stringByEvaluatingJavaScriptFromString wants a SINGLE parameter. You are passing it 2 parameters Your quoted string, and a value that you want to be inserted into that string. You can't do that. There are specific methods like the NSString method stringWithFormat, and the NSLog function, that can take a variable number of arguments and parse a format string, but most cannot.

Break your statement into two lines:

Code:

NSString *jsString = [NSString stringWithFormat: 
  @"document.getElementById('email').value='%@';", 
  usname];
[myWebView stringByEvaluatingJavaScriptFromString: jsString];

The NSString method stringWithFormat takes a format string and a variable number of arguments and returns a string result. You can then pass the resulting string to your webVeiw's stringByEvaluatingJavaScriptFromString method.

Thank you Duncan! I will remember what you said! And yes, my code works now =)