Newbee HTML and Parameters

Discussion in 'iOS Programming' started by KeithsPuma, Aug 17, 2008.

  1. KeithsPuma macrumors newbie

    Jul 12, 2004
    I have added a HTML file to my project so that it's embedded within the application.
    With the following code I can view the HTML file in the iPhone simulator.

    NSBundle *bundle   = [ NSBundle mainBundle ];
    NSString *path     = [ bundle bundlePath ];
    NSString *fullPath = [ NSBundle pathForResource:@"TestHTML" ofType:@"html" inDirectory:path ];
    NSString *params   = @"?Fred=1.2&Bert=-2.2&Harry=3";
    NSString *fullURL  = [ NSString stringWithFormat:@"%@%@", fullPath, params ];
    // fullPath = "/Users/keith/Library/Application Support/iPhone Simulator/User/Applications/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx/"
    [ self loadRequest:[ NSURLRequest requestWithURL:[ NSURL fileURLWithPath:fullPath ] ] ];
    Now this works as it can Find the Embedded HTML file "TestHTML.html"

    My question is how do I pass parameters into the HTML file ie "Fred=1 Bert=-2.2 Harry=3" so that the java script can use them.
    If I try the usual method by appending "?Fred=1.2&Bert=-2.2&Harry=3" to the URL then the application does not work, I suspect its trying to find the file "TestHTML.html?Fred=1.2&Bert=-2.2&Harry=3"

    // fullURL = "/Users/keith/Library/Application Support/iPhone Simulator/User/Applications/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx/"
    [ self loadRequest:[ NSURLRequest requestWithURL:[ NSURL fileURLWithPath:fullURL ] ] ];
    This does NOT work

    any suggestions please

  2. pashik macrumors member

    Jul 16, 2008
    U can add this parameters as hidden fields into html
    <input type="hidden" name="Fred" value="1">
    Javascript can work with elements in DOM without probelms
  3. KeithsPuma thread starter macrumors newbie

    Jul 12, 2004
    Thanks for your reply, but I don't think I explained the problem properly.
    I have a HTML file that works when I pass variable into it by adding "?fred=1" etc. after the html extension.

    I want the application to pass these variable to the HTML so that the javascript can use these values.
    The way I usually do this is by doing "test.html?Fred=1"
    Then the java script processes this as a parameter and creates the variable accordingly.

    I need to pass these variable values into the HTML file, but because I've EMBEDDED the HTML file within the application, it can't find the HTML file in its Bundle if a append anything after the ".html" even a space.

  4. kainjow Moderator emeritus


    Jun 15, 2000
    Are you sure the NSURL object is valid on the iPhone? I'd put it in a separate variable so you can check it specifically.

    Also I would use this code for getting the path - a bit cleaner:
    NSString *fullPath = [[NSBundle mainBundle] pathForResource:@"TestHTML.html" ofType:nil];
  5. KeithsPuma thread starter macrumors newbie

    Jul 12, 2004
    I'm pretty sure as if I don't append parameters it works. if i just an a single space to the URL then it doesn't.
    I have used 2 variable above initial post the testing ( fullpath and fullURL ) if I use the fullpath in the call "requestWithURL" it works but not if I call "requestWithURL" with the fullURL variable.
    I've tested it with fullpath and just added a space to it and that doen't.

    agreed that does look neater, thanks for that.
    Thanks for the help. I just wonder if its a bug or by design ?

  6. kainjow Moderator emeritus


    Jun 15, 2000
    I bet it's not working because fileURLWithPath expects a valid file, but you are appending the URL parameters to the file path. I would try using fileURLWithPath with the original .html file name (without the parameters), then on the URL call absoluteString to get the full URL as a string (which would be file://something, and then append to that the URL parameters.
  7. KeithsPuma thread starter macrumors newbie

    Jul 12, 2004

    Thanks to all who tried to help.
    I've given up with trying to pass variables.
    I now dynamically create the web page.
    For those who are interested this seems to work ;-)
    float fred = 1.234;
    NSError *error;
    // Create the webpage
    NSString * webPage = @"";
    webPage = [ webPage stringByAppendingString:@"<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Strict//EN\" \"\">\n" ];
    webPage = [ webPage stringByAppendingString:@"<html\">\n" ];
    webPage = [ webPage stringByAppendingString:@"  <head>\n" ];
    webPage = [ webPage stringByAppendingString:@"    <meta http-equiv=\"content-type\" content=\"text/html; charset=utf-8\"/>\n" ];
    webPage = [ webPage stringByAppendingString:@"    <title>iPhone - Test WebPage</title>\n" ];
    webPage = [ webPage stringByAppendingString:@"    <script type=\"text/javascript\">\n" ];
    webPage = [ webPage stringByAppendingString:@"      var fred =" ];
    webPage = [ webPage stringByAppendingString: [ NSString stringWithFormat:@"%f", fred ] ];
    webPage = [ webPage stringByAppendingString:@";" ];
    webPage = [ webPage stringByAppendingString:@"</html>\n" ];
    // write to file
    if ( [ webPage writeToFile:@"webpage.html" atomically:YES encoding:NSUTF8StringEncoding error:&error ] )
      // Now try to display the WebPage
      [ self loadRequest:[ NSURLRequest requestWithURL:[ NSURL fileURLWithPath:@"webpage.html" ] ] ];
    NSLog( webPage );
    regards Keith
  8. kainjow Moderator emeritus


    Jun 15, 2000
    Did you try what I wrote above? I just tested and it works :)
    NSString *htmPath = [[NSBundle mainBundle] pathForResource:@"params.htm" ofType:nil];
    NSString *fileURLString = [[NSURL fileURLWithPath:htmPath] absoluteString];
    NSString *params = @"?name=bob";
    NSURL *fileURL = [NSURL URLWithString:[fileURLString stringByAppendingString:params]];
    [webView loadRequest:[NSURLRequest requestWithURL:fileURL]];
    The HTML I used:
    <meta name="viewport" content="minimum-scale=1.0, width=device-width, maximum-scale=1">
    <script language="javascript">
    // from
    function gup( name )
      name = name.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]");
      var regexS = "[\\?&]"+name+"=([^&#]*)";
      var regex = new RegExp( regexS );
      var results = regex.exec( window.location.href );
      if( results == null )
        return "";
        return results[1];
    function get_name()
      return gup('name');
    Your name is: <script language="javascript">document.write(get_name());</script>
  9. KeithsPuma thread starter macrumors newbie

    Jul 12, 2004
    I did try but i misunderstood what you meant, I just put "file://" at the beginning of the string. Anyway Just tried your method and it works a treat. All is not lost as a newbee I have been learning xcode. As a seasoned windows "delphi" programmer its a big culture shock in the differences between Object C and Pascal.
  10. svjim macrumors newbie

    Aug 27, 2008
    referencing bundled javascript files

    This thread has been a tremendous help to me, however I have an additional question.

    I am using a UIWebView and I am able to load an html file that is in the resources directory, but it references javascript libraries that are also in the resource directory.

    <script language="javascript" type="text/javascript" src="foo.js"></script>

    Since foo.js in in the in the same directory, I thought it would load, but not so. Any suggestion on what I need to do to make this work would be appreciated.


  11. kainjow Moderator emeritus


    Jun 15, 2000
    I would suggest using tokens. For exame, replace foo.js with $foo.js$, then you could use NSMutableString to replace $foo.js$ with the full path, which you can find using NSBundle's pathForResource:eek:fType:. So the first time you launch the app, read in the HTML from your app's resources folder, replace the tokens, and then write it out to your app's documents folder.
  12. svjim macrumors newbie

    Aug 27, 2008
  13. kainjow Moderator emeritus


    Jun 15, 2000
    Actually, you might be able to use URLWithString:relativeToURL: instead.
  14. svjim macrumors newbie

    Aug 27, 2008
    relative URLS with UIWebView

    Again thanks for all the help. I ended up doing the following.

    // get the path to the main bundle
    	NSString *bundlePath = [[NSBundle mainBundle]bundlePath];
    	// get the path to the  the html file
    	NSString *fullPath = [[NSBundle mainBundle] pathForResource:@"tutorial2.html" ofType:nil];
    	// read the html page into a string
    	NSString *htmlText = [NSString stringWithContentsOfFile:fullPath];
    	// Load the page as a string with the base URL set to the bundlePath 
                -- Now relative references in the page work
    	[webView loadHTMLString:htmlText baseURL:[NSURL fileURLWithPath:bundlePath]];

    I am still going to use tokens in the HTML, but not for relative URL addresses. I hope this might help someone else facing a similar problem.


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