How do I edit the HTML in a UIWebView? - ios

Question

I have a UIWebView that loads HTML. How do I access those HTML elements and change them?
I want to do something like: webView.getHTMLElement(id: main-title).value = "New title"

Answer 1

If you want to edit it in a form, this is how you can do it:
- (void)webViewDidFinishLoad:(UIWebView *)webView {
NSString *evaluate = [NSString stringWithFormat:#"document.form1.main-title.value='%#';", #"New title"];
[webView stringByEvaluatingJavaScriptFromString:evaluate];
}
Or if not in a form, maybe this (untested):
- (void)webViewDidFinishLoad:(UIWebView *)webView {
NSString *evaluate = [NSString stringWithFormat:#"document.getElementById('main-title').value='%#';", #"New title"];
[webView stringByEvaluatingJavaScriptFromString:evaluate];
}
Note! I assume it is an editable field that you want to change. Otherwise you are talking about parsing and that concept works like this:
static BOOL firstLoad = YES;
- (void)webViewDidFinishLoad:(UIWebView *)webView {
if (firstLoad) {
firstLoad = NO;
NSString *html = [_webView stringByEvaluatingJavaScriptFromString:#"document.documentElement.outerHTML"];
//Edit html here, by parsing or similar.
[webView loadHTMLString:html baseURL:[[NSBundle mainBundle] resourceURL]];
}
}
You can read more about parsing here: Objective-C html parser

Answer 2

First look at this post --> Getting the HTML source code of a loaded UIWebView
Then check this one out -->
Xcode UIWebView local HTML
Hopefully this works out for you

Answer 3

Try this:
[webView stringByEvaluatingJavaScriptFromString:#"document.getElementById(\"main-title\").value = \"New Title\""];
make sure you execute this code after the document is loaded.