Reading HTML content from a UIWebView

Question

Is it possible to read the raw HTML content of a web page that has been loaded into a UIWebView   If not  is there another way to pull raw HTML content from a web page in the iPhone SDK  such as an equivalent of the  NET WebClient  openRead

User · Answer

Note that the NSString stringWithContentsOfURL will report a totally different user-agent string than the UIWebView making the same request. So if your server is user-agent aware, and sending back different html depending on who is asking for it, you may not get correct results this way.

Also note that the @"document.body.innerHTML" mentioned above will only display what is in the body tag. If you use @"document.all[0].innerHTML" you will get both head and body. Which is still not the complete contents of the UIWebView, since it will not get back the !doctype or html tags, but it is a lot closer.

User · Answer

To read -  NSString  html    myWebView stringByEvaluatingJavaScriptFromString    document getElementById  your div id   textContent    NSLog html         To modify -  html    myWebView stringByEvaluatingJavaScriptFromString    document getElementById  your div id   textContent

User · Answer

I use a swift extension like this   extension UIWebView       var htmlContent String            return self stringByEvaluatingJavaScript from   document documentElement outerHTML

User · Answer

you should try this   document documentElement outerHTML

User · Answer

if you want to extract the contents of an already-loaded UIWebView  -stringByEvaluatingJavaScriptFromString  For example   NSString   html    webView stringByEvaluatingJavaScriptFromString    document body innerHTML

User · Answer

To get the whole HTML raw data  with  lt head gt  and  lt body gt     NSString  html    webView stringByEvaluatingJavaScriptFromString   document documentElement outerHTML

User · Answer

In Swift v3   let doc   webView stringByEvaluatingJavaScript from   document documentElement outerHTML

User · Answer

The second question is actually easier to answer  Look at the stringWithContentsOfURL encoding error  method of NSString - it lets you pass in a URL as an instance of NSURL  which can easily be instantiated from NSString  and returns a string with the complete contents of the page at that URL  For example   NSString  googleString     http   www google com   NSURL  googleURL    NSURL URLWithString googleString   NSError  error  NSString  googlePage    NSString stringWithContentsOfURL googleURL                                                  encoding NSASCIIStringEncoding                                                    error  amp error     After running this code  googlePage will contain the HTML for www google com  and error will contain any errors encountered in the fetch   You should check the contents of error after the fetch    Going the other way  from a UIWebView  is a bit trickier  but is basically the same concept  You ll have to pull the request from the view  then do the fetch as before   NSURL  requestURL     yourWebView request  URL   NSError  error  NSString  page    NSString stringWithContentsOfURL requestURL                                            encoding NSASCIIStringEncoding                                              error  amp error     EDIT  Both these methods take a performance hit  however  since they do the request twice  You can get around this by grabbing the content from a currently-loaded UIWebView using its stringByEvaluatingJavascriptFromString  method  as such   NSString  html    yourWebView stringByEvaluatingJavaScriptFromString                                              document body innerHTML      This will grab the current HTML contents of the view using the Document Object Model  parse the JavaScript  then give it to you as an NSString  of HTML   Another way is to do your request programmatically first  then load the UIWebView from what you requested  Let s say you take the second example above  where you have NSString  page as the result of a call to stringWithContentsOfURL encoding error   You can then push that string into the web view using loadHTMLString baseURL   assuming you also held on to the NSURL you requested    yourWebView loadHTMLString page baseURL requestURL     I m not sure  however  if this will run JavaScript found in the page you load  the method name  loadHTMLString  is somewhat ambiguous  and the docs don t say much about it    For more info    UIWebView class reference NSString class reference NSURL class reference

User · Answer

UIWebView  get HTML from UIWebView   let content   uiWebView stringByEvaluatingJavaScript from   document body innerHTML     set HTML into UIWebView    Do not forget to extend a class from  UIWebViewDelegate  and nil the delegate  func someFunction          let uiWebView   UIWebView       uiWebView loadHTMLString   lt html gt  lt body gt  lt  body gt  lt  html gt    baseURL  nil      uiWebView delegate   self as  UIWebViewDelegate    func webViewDidFinishLoad   webView  UIWebView          ready to be processed      get set HTML from WKWebView

User · Answer

Xcode 5 iOS 7  Universal App example for iOS 7 and Xcode 5  It is an open source project   example located here  Link to SimpleWebView  Project Zip and Source Code Example

[html] Reading HTML content from a UIWebView

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