Am trying to send an html(which javascript tags) email from my ios app. there is no errors but the javascript will not work
my code below:
- (IBAction)sendDirection:(id)sender {
// Email Subject
NSString *emailTitle = #"example subject";
// Email Content
NSString *messageBody = #"<html><head><script>function initialize(){document.getElementById('directions').innerHTML = 'testing';}</script></head><body onload='initialize()'></div><span id='directions'></span></body></html>";
// To address
NSArray *toRecipents = [NSArray arrayWithObject:#"info#example.com"];
MFMailComposeViewController *mc = [[MFMailComposeViewController alloc] init];
mc.mailComposeDelegate = self;
[mc setSubject:emailTitle];
[mc setMessageBody:messageBody isHTML:YES];
[mc setToRecipients:toRecipents];
// Present mail view controller on screen
[self presentViewController:mc animated:YES completion:NULL];
}
Many email clients disable JavaScript to prevent XSS attacks and other vulnerabilities. Your best bet is to stick to plain HTML+CSS, and even then some of the more interesting CSS features may not be available, depending on the client.
It's hard to tell what you're trying to do with JavaScript, but it's best if you keep all programming in Objective-C and use mail composer only for HTML markup.
Related
I've an Android Activity and I've got a Button that button need to access some Javascript function. Simply my app get the user info(ID,pass) then go to web page(this operation doing backgrun with asynctask class) write these two info as ID and pass then user click the Log In button in my app button has to use some js function
<script type="text/javascript">
//<![CDATA[
var theForm = document.forms['form1'];
if (!theForm) {
theForm = document.form1;
}
function __doPostBack(eventTarget, eventArgument) {
if (!theForm.onsubmit || (theForm.onsubmit() != false)) {
theForm.__EVENTTARGET.value = eventTarget;
theForm.__EVENTARGUMENT.value = eventArgument;
theForm.submit();
}
}
//]]>
</script>
this is the func. i need to use
My post and get request for connection the site are
POST//
URL url = new URL(params[0]); //http://login.cu.edu.tr/Login.aspx? site=https://derskayit.cu.edu.tr&ReturnUrl=%2f
connection=(HttpURLConnection) url.openConnection();
connection.setDoOutput(true);
OutputStreamWriter writer = new OutputStreamWriter(connection.getOutputStream());
writer.write(data);
writer.flush();
these codes for the put the ID and pass
GET //
reader= new BufferedReader((new InputStreamReader(connection.getInputStream())));
StringBuilder builder = new StringBuilder();
String line;
while((line= reader.readLine())!=null){
builder.append(line + "\n");
}
text=builder.toString();
there is any help or suggestion for me i am very confused about that situation and i feel really bad myself thanks for helps anyway. Have a nice day
For using Javascript without a webView to make requests!
The question has already an answer here in this question
The javax.script package is not part of the Android SDK. You can execute JavaScript in a WebView, as described here. You perhaps can use Rhino, as described here. You might also take a look at the Scripting Layer for Android project.
Also a similar question was asked here
You can execute JavaScript without a WebView. You can use AndroidJSCore. Here is a quick example how you might do it:
HttpClient client = new DefaultHttpClient();
HttpGet request = new HttpGet("http://your_website_here/file.js");
HttpResponse response = client.execute(request);
String js = EntityUtils.toString(response.getEntity());
JSContext context = new JSContext();
context.evaluateScript(js);
context.evaluateScript("question.vote(0);");
However, this most likely won't work outside of a WebView, because I presume you are not only relying on JavaScript, but AJAX, which is not part of pure JavaScript. It requires a browser implementation.
Is there a reason you don't use a hidden WebView and simply inject your code?
// Create a WebView and load a page that includes your JS file
webView.evaluateJavascript("question.vote(0);", null);
Otherwise:
Yes you can make HTTP POST and HTTP GET requests without using WebView. But if you want to use a webView remember Javascript in a webview is disabled by default (for security purposes). So before calling any javascript functions make sure you enable javascript in your webview like this
webView.getSettings().setJavaScriptEnabled( true );
And after that javascript will be enabled in your webView.
But in case you do not want to use a webview and javascript to make http requests. There is a lot of alternative methods you can define a Button in your activity's layout in xml. And respond with a http request on button Clicked listener!
Also remember making http Request using Android/Java default classes is a huge task and error prone and requires you to care about using async tasks to avoid blocking the UI thread.
Alternatively
In android we use ready-made library to make http requests. Google has a good library called Volley. it is easy to customize,respond to errors and it automatically making request out of the main thread.See more explanation here!. If there is still some problems comment below!
I am writing an app for ios to extract information from a webpage, however, the relevant pieces on the page are built by javascript. So when it is loaded by webview, the javascript is executed and the information displays no problem. If I try to load the page into a string by using the following method, the javascript is loaded, but not actually executed, therefore the string has no useful data in it.
NSData *urlData = [NSData dataWithContentsOfURL:[NSURL URLWithString:fullURL]];
NSString *responseString = [[NSString alloc] initWithData:urlData encoding:NSUTF8StringEncoding];
Is there another way besides loading the page into webview and exporting it from there? If not, how do you do that?
I'm not sure if there's another way outside of letting the UIWebView execute the JS and render the page, but if you do end up going this route, you could just grab the HTML of the whole page and pass that to the native end like so:
[dummyWebView stringByEvaluatingJavaScriptFromString:#"document.getElementsByTagName('html')[0].outerHTML;"];
Listening to the window.load event might be better to know when the page has finished going through all the JS
Good luck!
You set delegate to webView: self.webView.delegate = self; and implement UIWebViewDelegate:
- (void)webViewDidFinishLoad:(UIWebView *)webView
{
NSString *html = [webView stringByEvaluatingJavaScriptFromString:#"document.documentElement.outerHTML"];
NSLog(#"html1 = %#", html);
// or use
NSString *html2 = [webView stringByEvaluatingJavaScriptFromString:#"document.body.innerHTML"];
NSLog(#"html2 = %#", html2);
}
<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.
I am trying to add Readability (a third party app) compatibility with my web browser, and I tracked down a bookmarklet to save a page to Readability:
javascript:(%28function%28%29%7Bwindow.baseUrl%3D%27http%3A//www.readability.com%27%3Bwindow.readabilityToken%3D%27bbRmvVb9nTNRWSVEGb9yrcFP4USUHnTjk2EVWXjn%27%3Bvar%20s%3Ddocument.createElement%28%27script%27%29%3Bs.setAttribute%28%27type%27%2C%27text/javascript%27%29%3Bs.setAttribute%28%27charset%27%2C%27UTF-8%27%29%3Bs.setAttribute%28%27src%27%2CbaseUrl%2B%27/bookmarklet/read.js%27%29%3Bdocument.documentElement.appendChild%28s%29%3B%7D%29%28%29)
however, I can't seem to get it to work. It works in desktop Safari and mobile/iPhone Safari. But both of the methods below do nothing:
[webview stringByEvaluatingJavaScriptFromString: readability];
[webview loadRequest: [NSURLRequest requestWithURL: [NSURL URLWithString: readability]]];
(readability is a string with the value above)
Is there another method to run javascript bookmarklets that I am unaware of or am I doing something wrong? Help is much appreciated.
Greg
You got this error is because the javascript url is encoded, you should decode the javascript string, (may be you use NSURL to pass the string, so it was encoded by NSURL)
then use the webview stringByEvaluatingJavaScriptFromString, this solution work well
-(void)loadUrl:(NSURL*)url
{
if ([[url scheme] isEqualToString:#"javascript"])
{
NSRange range = [[url absoluteString] rangeOfString:#"javascript:"];
NSString *javaScriptString = [[[url absoluteString] substringFromIndex:range.location + range.length] URLDecodedString];
[self stringByEvaluatingJavaScriptFromString:javaScriptString];
}
else
{
[self loadRequest:[NSURLRequest requestWithURL:url]];
}
}
You probably need to use their API. What you are trying to do is likely prevented for security reasons, and you need to put your own API key in the request.
I have made a login form in html/javascript to be injected into a UIWebView in my iPhone application. This all works really well and the login works. But when I press the login button it goes to the expected page within that view.
I was wondering if I could inject some objective c or by ways of a javascript do a modalView or dismissView to have upon the login have the page go to the application.
In the Application I have just made the UI of the webpage more user friendly.
So to kind of show what I am asking I have pasted some code.
NSString *myHTML = #"<form action="gotowebsite.com" onSubmit='return !validateLogin();'><input some textfield><input password field>";
Now I am imagining that the dismissal code will go into the onSubmit area.
Am I on a possibly good track??
Cheers Jeff
Implement UIWebViewDelegate in your class and on successful login redirect your page to a url like login://success
when you redirect your page, UIWebview will start loading request and the call the function written below.
- (BOOL)webView:(UIWebView*)webView shouldStartLoadWithRequest:(NSURLRequest*)request navigationType:(UIWebViewNavigationType)navigationType {
//CAPTURE USER LINK-CLICK.
NSURL *url = [request URL];
NSString *urlStr = [url absoluteString];
if([urlStr isEqualToString:#"login://success"]){ //same url which you gave for redirection
[self dismissModalViewControllerAnimated:YES]; // or do whatever you want to do on a successful login
}
return YES;
}