I have been implementing EasyJSWebView into a project that pops up a web view on the receipt of a push message. This works fine for the most part, until you want to reload the current webview. At that point the functionality of EasyJSWebView breaks and the javascript in the webpage cannot communicate with the objective C running in the app.
This is the code I'm using to add the interface to the webview and then load the page on the view.
_webView.delegate = self;
javaScriptInterface* interface = [javaScriptInterface new];
[self.webView addJavascriptInterfaces:interface WithName:#"interface"];
interface.webView = self;
[interface release];
[[NSURLCache sharedURLCache] removeAllCachedResponses];
[_webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:#"mywebpage.com"]]];
If I call another loadrequest on the webview, even if it is to the same page, this stops working. I have tried adding another interface object to the webview before a reload but that doesn't seem to do anything either.
At the moment I am destroying the current webview and creating a new one each time I need to do a reload or another push message is received.
Is there any fix or workaround to this? I would like to be able to use one webview for everything and not worry if it gets reloaded or not.
There's a bug in the original EasyJSWebView repository.
Just use the fork from here: https://github.com/andiradulescu/EasyJSWebView
I'm not sure if this is the best way to solute the issue, but it works in my project. My method is to create an new UIWebView before every reload or redirect request. Below is the details:
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
//'isNotFirstLoad' marks if it is the fisrt load.
if (isNotFirstLoad) {
//create an new webview
CGRect frame = _myWebView.frame;
[_myWebView removeFromSuperview];
_myWebView = [[EasyJSWebView alloc] initWithFrame:frame];
[self.view addSubview:_myWebView];
//init the new webview
_webView.delegate = self;
javaScriptInterface* interface = [javaScriptInterface new];
[self.webView addJavascriptInterfaces:interface WithName:#"interface"];
[_myWebView loadRequest:request];
//reset the firstload flag to load the new request
isNotFirstLoad = NO;
return NO;
}
isNotFirstLoad = YES;
return YES;
}
Related
I'm using a WKWebview to run javascript scripts.
I am not using JSContext et.al since I need the javascript context to be able to perform XHTTP requests which aren't possible with JSContext alone.
This view is not added to the view hierarchy and I have no interest to do so.
The WKWebview is only used for its ability to run JS code in its engine.
The javascript code is working exactly as expected on the simulator.
The exact same code will also work in the context of certain other applications which I've tested with.
But for some reason in certain applications the WKWebview will not perform the javascript unless the WKWebview is added to the view hierarchy. The following code will work as expected. If removing the #warning code , stops working as expected
-(void)connect {
//TODO: Handle multiple connect calls
WKUserContentController *userContentController = [WKUserContentController new];
[self addScriptMessageHandlersForSocketEvents:userContentController];
NSString *socketFileContent = [self.class socketIOScript];
WKUserScript *socketIOScript = [[WKUserScript alloc] initWithSource:socketFileContent
injectionTime:WKUserScriptInjectionTimeAtDocumentStart
forMainFrameOnly:NO];
[userContentController addUserScript:socketIOScript];
NSString *bridgeJs = [self.class bridgeScript];
WKUserScript *bridgeScript = [[WKUserScript alloc] initWithSource:bridgeJs
injectionTime:WKUserScriptInjectionTimeAtDocumentStart
forMainFrameOnly:NO];
[userContentController addUserScript:bridgeScript];
NSMutableDictionary *d = [NSMutableDictionary new];
for (NSURLQueryItem *item in _parameters) {
d[item.name] = item.value;
}
NSString *params = json(d);
NSString *socketURLScript = [NSString stringWithFormat:#"createSocket(%#,%#);log('created script')",stringify(_url),params];
WKUserScript *createSocket = [[WKUserScript alloc] initWithSource:socketURLScript
injectionTime:WKUserScriptInjectionTimeAtDocumentEnd
forMainFrameOnly:NO];
[userContentController addUserScript:createSocket];
WKWebViewConfiguration * wkconfiguration = [WKWebViewConfiguration new];
wkconfiguration.userContentController = userContentController;
_wv = [[WKWebView alloc] initWithFrame:CGRectMake(0, 0, 0, 0) configuration:wkconfiguration];
#warning REMOVE THIS AND THE WKWebview stops working on some devices (NOT ALL DEVICES) and works in some applications as expected
[[UIApplication sharedApplication].keyWindow addSubview:_wv];
// END REMOVE THIS
_wv.navigationDelegate = self;
dispatch_group_enter(_loadedSemaphore);
[_wv loadHTMLString:#"<h1></h1>" baseURL:nil];
}
did you implement all the delegate methods for WKWebView ?
I have an iOS app with a web view controller, which is a delegate of a web view. I would like my UIWebView to never show a url which has a certain keyword or part of a URL. (In my case, I want to block a misleading error page from the app server, which can appear in response to any request).
I'm listening to these events:
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {}
-(void)webViewDidFinishLoad:(UIWebView *)webView{}
- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error {}
I'm not sure if listening to these events is enough to make sure that all internal page redirects, including those of javascript would be inspected and the offending url will be prevented from loading.
How can I create a UIWebView which will never show a certain page?
You can check if the keyword is in the URL that was requested and stop the page from loading by returning false. I am assuming the keyword you are looking for will be in the URL? Let's pretend it's errorPage.
-(BOOL) webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
NSURL *requestedURL = request.URL
NSString *stringCheck = requestedURL.absoluteString;
// This is the important part--check if errorPage is in the URL.
NSRange range = [urlString rangeOfString:#"errorPage"];
if (range.location == NSNotFound)
return YES;
else
return NO;
}
I was wondering if anyone knew how to do this. I have a bunch of NSNotifications and I'd like to create listeners in Javascript, embedded in a UIWebView, that will get executed when the NSNotifications are received.
I know this is possible using PhoneGap and the method sendPluginResult, but I was wondering if there was another way of doing it without cordova.
Thanks
Create your listener outside the UIWebView and send the stringByEvaluatingJavaScriptFromString message to your web view.
- (void)registerObserver
{
NSArray *names = [NSArray arrayWithObjects:
#"FirstNotification", #"SecondNotification", #"ThirdNotification", nil];
for (NSString *name in names)
{
[[NSNotificationCenter defaultCenter]
addObserver:self
selector:#selector(notificationReceived:)
name:#"NotificationName"
object:nil];
}
}
- (void)notificationReceived:(NSNotification *notification)
{
NSString *js = [NSString stringWithFormat:
#"notificationReceived('%#');", notification.name];
[self.webView stringByEvaluatingJavaScriptFromString:js];
}
in the call back NSNotification method call this:
[yourwebview stringByEvaluatingJavaScriptFromString:#"methodName()"];
and create that "methodname" in your javascript code
I'm trying to download a file programmly on this site, and I found that when you click the highlighted download button("下载"), it runs a Javascript: document.getElementById('downLoad').action='/download.php?fileid=11024011';downishare('0');
On my Mac, it runs fine and downloads the file when I run it on Safari. But when I use
[webView stringByEvaluatingJavaScriptFromString:[NSString stringWithFormat:#"document.getElementById('downLoad').action='/download.php?fileid=11024011'"]];
It doesn't return anything.
Does anyone know why and how can I get the download URL?
Thanks.
Well... the download url is this: http://ishare.iask.sina.com.cn/download.php?fileid=11024011
You can check it also with the 'Network' tab in chrome or firebug in firefox. BUT... when you try to access it directly, it redirects you. There might be some server side validation of the request, like the referrer url or something.
Have you tried implementing the webView delegate method shouldStartLoadWithRequest to parse through links?
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
if ([[[request URL] absoluteString] hasPrefix:#"http://ishare.iask.sina.com.cn/download.php?fileid="])
//I believe this would download everything that has a link prefix of "http://ishare.iask.sina.com.cn/download.php?fileid="
//So you should create some sort of checker to make sure it only downloads the file they select
// Determile cache file path
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *filePath = [NSString stringWithFormat:#"%#/%#", [paths objectAtIndex:0],#"index.html"];
// Download and write to file
NSURL *url = [NSURL URLWithString:[[request URL] absoluteString]];
NSData *urlData = [NSData dataWithContentsOfURL:url];
[urlData writeToFile:filePath atomically:YES];
// Load file in UIWebView
[webView loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:filePath]]];
return NO;
}
else {
return YES;
}
<script language="javascript">
alert("Hell! UIWebView!");
</script>
I can see the alert message inside my UIWebView but can I handle this situation?
Update:
I'm loading a web-page into my UIWebView:
- (void)login {
NSString *requestText = [[NSString alloc] initWithFormat: #"%#?user=%#&password=%#", DEFAULT_URL, user.name, user.password]; // YES, I'm using GET request to send password :)
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:requestText]];
[webView loadRequest:request];
}
The target page contain a JS. If user name or password is incorrect this JS show alert.
I have not any access to its sources.
I want to handle it inside my UIWebViewDelegate.
A better solution to this problem is to create a Category for UIWebView for the method
webView:runJavaScriptAlertPanelWithMessage:initiatedByFrame:
So that you can handle the alert event in any way that you'd like. I did this because I don't like the default behavior of UIWebView when it puts the filename of the source in the UIAlertView title. The Category looks something like this,
#interface UIWebView (JavaScriptAlert)
- (void)webView:(UIWebView *)sender runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WebFrame *)frame;
#end
#implementation UIWebView (JavaScriptAlert)
- (void)webView:(UIWebView *)sender runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WebFrame *)frame {
UIAlertView* dialogue = [[UIAlertView alloc] initWithTitle:nil message:message delegate:nil cancelButtonTitle:#"Okay" otherButtonTitles:nil];
[dialogue show];
[dialogue autorelease];
}
#end
This seems to do it:
- (void)webViewDidFinishLoad:(UIWebView *)webView
{
JSContext *ctx = [webView valueForKeyPath:#"documentView.webView.mainFrame.javaScriptContext"];
ctx[#"window"][#"alert"] = ^(JSValue *message) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"JavaScript Alert" message:[message toString] delegate:nil cancelButtonTitle:#"OK" otherButtonTitles:nil];
[alert show];
};
}
Note: only tested on iOS 8.
If by "contain a flash" you mean the page you're loading into your web view has an Adobe Flash movie in it, you're out of luck, I'm afraid. Mobile Safari doesn't support Flash, and most likely never will.
In the general case, if you want JavaScript running in a web view to communicate with the native app hosting it, you can load fake URLs (for example: "myapp://alert?The+text+of+the+alert+goes+here."). That will trigger the webView:shouldStartLoadWithRequest:navigationType: delegate method. In that method, inspect the request, and if the URL being loaded is one of these internal communications, trigger the appropriate action in your app, and return NO.