I am displaying one UIWebView in my iPhone application. In UIWebView I am displaying HTML page which has JavaScript also. I want to call method(of X Code) when one button is clicked in HTML page.
How can I do this. Thanks
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2 Answers
If I understand your question correctly, you want to call an Objective C method from a javascript onClick event handler in your UIWebView. The way to do that is to redirect the browser to a URL with a custom scheme in your javascript code like this:
function buttonClicked() {
window.location.href = "yourapp://buttonClicked";
}
Back in Objective C, declare that your view controller conforms to the UIWebViewDelegate protocol,
@interface DTWebViewController : DTViewController <UIWebViewDelegate> {
...
set your controller as the web view's delegate,
- (void)viewDidLoad {
[super viewDidLoad];
self.webView.delegate = self;
}
and intercept the URL before it loads like this:
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
if ([[request.URL scheme] isEqual:@"yourapp"]) {
if ([[request.URL host] isEqual:@"buttonClicked"]) {
[self callYourMethodHere];
}
return NO; // Tells the webView not to load the URL
}
else {
return YES; // Tells the webView to go ahead and load the URL
}
}
5 Comments
BlackTigerX
cool, this also works for intercepting anchor clicks, the navigationType will be UIWebViewNavigationTypeLinkClicked
ganesh manoj
function buttonClicked() { window.location.href = "yourapp://buttonClicked"; } can you tell more about these lines
arlomedia
This works great with the following change: yourapp://buttonClicked should contain a host component, like yourapp://www.yourapp.com/buttonClicked. Then the path will be "/buttonClicked". Otherwise, it will be an empty string.
Demonedge
This doesn't work for me on ios9, does anyone know why?
AmyNguyen
hi, I'm using your code with Swift, but nothing is happen, my code: unc webView(webView: UIWebView, shouldStartLoadWithRequest request: NSURLRequest,navigationType: UIWebViewNavigationType)-> Bool{ if (request.URL!.scheme == "index//clickFunction") { self.move() return false } else return true. Thought, request is equal "index//clickFunction", it runs to else return true. So, where I was wrong, please?
Swift Version
webView.delegate = self
extension ViewController: UIWebViewDelegate {
func webView(_ webView: UIWebView, shouldStartLoadWith request: URLRequest, navigationType: UIWebViewNavigationType) -> Bool {
if request.description == "yourappname://buttonClicked" {
// do your stuff here
return false
}
return true
}
}
Example HTML
<a href="yourappname://buttonClicked">
<img src="http://someurl.com/table_desktop.jpg"/ width="100%">
</a>
If you want to know how to do it in wkWebView, here is the link
1 Comment
Soorej Babu
Its in swift. not objective c
