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Get text field information from a loaded web page - Mac OS X Development

I am new to the Mac world.

I need to create an application that can extract information entered on a web page from text fields. My application will load a webpage hosted somewhere, and inside the webpage there will be a series of text fields and a submit button. After clicking the button, I should be able to read the information entered into the text fields of this web page.

I have the code as follows:

+ (BOOL)isSelectorExcludedFromWebScript:(SEL)aSelector
{
// For security, you must explicitly allow a selector to be called from JavaScript.

if (aSelector == @selector(showMessage:)) {
    return NO; // i.e. showMessage: is NOT _excluded_ from scripting, so it can be called.
}

return YES; // disallow everything else
}

- (void)showMessage:(NSString *)message
{
    // This method is called from the JavaScript "onClick" handler of the INPUT element 
    // in the HTML. This shows you how to have HTML form elements call Cocoa methods.

  DOMDocument *myDOMDocument = [[webView mainFrame] DOMDocument];     // 3
  DOMElement *contentTitle = [myDOMDocument getElementById:@"TexTest"];   // DOM
  message = [[contentTitle firstChild] nodeValue];                                            // lines

  NSRunAlertPanel(@"Message from JavaScript", message, nil, nil, nil);
}

When I launch the application and get into NSRunAlertPanel, it no longer wants to execute.

When I comment out the three lines of the DOM, NSRunAlertPanel displays my message and I can continue.

HTML looks like this:

<body> 
  <h1 id="contentTitle">Some kind of title</h1>
  <div id="main_content"> 
    <p>Some content</p> 
    <p>Some more content</p> 
  </div> 
  <div>
    <input id="TexTest" value=" " type="text">
  </div> 
  <div>
    <input id="message_button" value="Show Message" onclick="window.AppController.showMessage_('Hello there...');" type="button">
  </div>
</body>

Can anyone help with this issue?

+3
1

. :

- (void)showMessage:(NSString *)message
{
    // This method is called from the JavaScript "onClick" handler of the INPUT element 
    // in the HTML. This shows you how to have HTML form elements call Cocoa methods.

  DOMHTMLDocument *myDOMDocument = [[webView mainFrame] DOMDocument];
  DOMHTMLElement *contentTitle = [myDOMDocument getElementById:@"TexTest"];
  message = [contentTitle value];

  NSRunAlertPanel(@"Message from JavaScript", message, nil, nil, nil);
}
+1

Source: https://habr.com/ru/post/1709992/

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