NSString in UIWebview

Question

I have an NSString and a webView in my project (Objective-C for iPhone), I have called index.html in webView and inside it I inserted my script (ja

Answer 1

When passing an NSString into a UIWebView (for use as a javascript String) you need to make sure to escape newlines as well as single/double quotes:

NSString *html = @"
Hello there
";

html = [html stringByReplacingOccurrencesOfString:@"\'" withString:@"\\\'"];
html = [html stringByReplacingOccurrencesOfString:@"\"" withString:@"\\\""];
html = [html stringByReplacingOccurrencesOfString:@"\n" withString:@"\\n"];
html = [html stringByReplacingOccurrencesOfString:@"\r" withString:@""];

NSString *javaScript = [NSString stringWithFormat:@"injectSomeHtml('%@');", html];
[_webView stringByEvaluatingJavaScriptFromString:javaScript];

The reverse process is well described by @Michael-Kessler