iPhone: stringByEvaluatingJavaScriptFromString gives wrong output

Question

I am showing a web page using html string in a UIWebview. I want to retrieve the value typed from the below text area code.

result = [result stringByAppendingFormat:@"<textarea name=\"qId_"];
    NSString *questionid = [question valueForKey:@"QuestionId"];
    NSString *questionidSTR = (NSString *) [NSString stringWithFormat:@"%@", questionid];
    result = [result stringByAppendingFormat:questionidSTR];
    [questionidArray addObject:questionidSTR];
    result = [result stringByAppendingFormat:@"\" rows=\"5\" style=\"width:90%\"></textarea>"];

I tried

NSString  *value = [NSString stringWithFormat:@"%@%@%@",@"document.getElementById('",[questionidArray objectAtIndex:i],@"').value"];

   NSString* out = [enterSurveyWebview stringByEvaluatingJavaScriptFromString:value];

But, its not giving the correct output, i think i'm doing wrong when retrieving the value.

Could someone please correct me for retrieving portion?

Thank you.

Lily Ballard · Accepted Answer · 2012-03-12 21:25:10Z

2

Your <textarea> has a name of qId_%@ (where %@ is the QuestionId), but your javascript is only asking for %@. You also need to be using getElementByName() instead of getElementById().

NSString *value = [NSString stringWithFormat:@"document.getElementsByName('qId_%@')[0].value", [questionidArray objectAtIndex:i]];

edited Mar 12, 2012 at 21:25

answered Mar 12, 2012 at 20:27

Lily Ballard

187k34 gold badges390 silver badges350 bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

Getsy Over a year ago

I tried correcting it, result=[NSString stringWithFormat:@"%@qId_%@%@",@"document.getElementById('",[questionidArray objectAtIndex:i],@"').value"]; but its not getting the value.

Lily Ballard Over a year ago

@Getsy: I think you want getElementByName()

Lily Ballard Over a year ago

Sorry, make that getElementsByName().

Getsy Over a year ago

Either result = [NSString stringWithFormat:@"document.getElementByName('%@').value", [questionidArray objectAtIndex:i]]; (or) result = [NSString stringWithFormat:@"document.getElementByName('qId_%@').value", [questionidArray objectAtIndex:i]]; , both are not giving the actual result.

Collectives™ on Stack Overflow

iPhone: stringByEvaluatingJavaScriptFromString gives wrong output

1 Answer 1

4 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

4 Comments

Your Answer

Sign up or log in

Post as a guest

Related