How can I open a View Controller when the UIWebView (by means of Java) recognized a click on an Image?
I have an HTML that says the following:
<html>
<head>
<meta name=viewport content=width=320/>
<script>
function imageClicked(){
var clicked=true;
window.location="/click/"+clicked;
}
</script>
</head>
<body>
<center><h1>This is Page One</h1></center>
<center><a href="javascript:void(0)" onMouseDown="imageClicked()"><IMG SRC="divers-circle.jpg">
</a></center>
</center><br><br>
<c开发者_JAVA技巧enter>Scuba divers</center>
</body>
</html>
The HTML is properly loaded to a UIWebView, since it is a local file:
[webView loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:((WebPageObj *)obj).webPath ofType:@"html"]isDirectory:NO]]];
webView.dataDetectorTypes = UIDataDetectorTypeAll;
Now, when I click the image, it recognized the click, but how can I implement an action within Xcode, for example, open another view or an alert?
BTW, I did this based on a tutorial that explains some concept, here is the link: http://www.codeproject.com/KB/iPhone/iPhoneDevReader.aspx
However, it created the HTML within Xcode, and in my case, I loaded the HTML, therefore, I need to somehow read the script within the HTML to include the following:
if ( [request.mainDocumentURL.relativePath isEqualToString:@"/click/false"] ) {
NSLog( @"not clicked" );
return false;
}
if ( [request.mainDocumentURL.relativePath isEqualToString:@"/click/true"] ) { //the image is clicked, variable click is true
NSLog( @"image clicked" );
UIAlertView* alert=[[UIAlertView alloc]initWithTitle:@"JavaScript called"
message:@"You've called iPhone provided control from javascript!!" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:nil];
[alert show];
[alert release];
return false;
}
return true;
}
What method will help me to do that? and where Shall I put it since I am using a ScrollView, and then loading the WebView when the page is called.
Thanks in advance.
You need to set a delegate for your UIWebView.
If you set a delegate for your UIWebView the following method will be called everytime your web view sends a request:
- (BOOL)webView:(UIWebView*)webView shouldStartLoadWithRequest:(NSURLRequest*)request navigationType:(UIWebViewNavigationType)navigationType {
NSURL *url = [request URL];
if (navigationType == UIWebViewNavigationTypeLinkClicked) {
if ([[url scheme] isEqualToString:@"click"]) {
// do whatever you want here to happen after the click
}
return NO;
} else {
return YES;
}
}
To make it as easy as possible change your html to the following (no Javascript needed):
<html>
<head>
<meta name=viewport content=width=320/>
</head>
<body>
<center><h1>This is Page One</h1></center>
<center><a href="click://"><IMG SRC="divers-circle.jpg"></a></center>
<br><br>
<center>Scuba divers</center>
</body>
</html>
When the image is clicked, the following is happening:
- The WebView sends a request with the URL "click://".
- The UIWebView delegate's method webView:shouldStartLoadWithRequest:navigationType: is being called
- the 2 "if" clauses in this method evaluate to "YES" because the request happened after a click (navigationType == UIWebViewNavigationTypeLinkClicked) and the URL's scheme is "click"
You find more about the UIWebViewDelegate protocol here.
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