Access webpage properties in Share extension

Question

I want to access webpage properties (Title, Meta - description, URL, default image, etc) when user opens Share extension on iOS using javascript file. I am using the following code for javascript (https://developer.apple.com/library/prerelease/ios/documentation/General/Conceptual/ExtensibilityPG/ExtensionScenarios.html#//apple_ref/doc/uid/TP40014214-CH21-SW12):

    var MyExtensionJavaScriptClass = function() {};

MyExtensionJavaScriptClass.prototype = {
    run: function(arguments) {
    // Pass the baseURI of the webpage to the extension.
        arguments.completionFunction({"url": document.baseURI});
        arguments.completionFunction({"host": getHost()});
        arguments.completionFunction({"title": document.title});
        arguments.completionFunction({"description": getDescription()});
        arguments.completionFunction({"image": getImage()});
    },
    getHost: function() {
        var l = document.createElement("a");
        l.href = href;
        return l.hostname;
    },
    getDescription: function() {
        var metas = document.getElementsByTagName('meta'); 

       for (i=0; i<metas.length; i++) { 
          if (metas[i].getAttribute("property") == "description") { 
             return metas[i].getAttribute("content"); 
          } 
       } 
        return "";
    },
    getImage: function() {
        // Need to find this out
        return "";
    },
// Note that the finalize function is only available in iOS.
    finalize: function(arguments) {
        // arguments contains the value the extension provides in [NSExtensionContext completeRequestReturningItems:completion:].
    // In this example, the extension provides a color as a returning item.
    document.body.style.backgroundColor = arguments["bgColor"];
    }
};

// The JavaScript file must contain a global object named "ExtensionPreprocessingJS".
var ExtensionPreprocessingJS = new MyExtensionJavaScriptClass;

Is this the right way to access Web page properties also what's the best way to fetch the first image in the content.

Any help would be much appreciated.

Answer 1

Here is how i solved this problem.

JS Code:

var MyExtensionJavaScriptClass = function() {};

MyExtensionJavaScriptClass.prototype = {
    getDescription: function() {
        var metas = document.getElementsByTagName('meta'); 
        for (i=0; i<metas.length; i++) { 
            if (metas[i].getAttribute("name") == "description") { 
                return metas[i].getAttribute("content"); 
            }
        }
        return "";
    },
    getImage: function() {
        var metas = document.getElementsByTagName('meta'); 
        for (i=0; i<metas.length; i++) { 
            if (metas[i].getAttribute("name") == "og:image" || metas[i].getAttribute("name") == "sailthru.image.full" || metas[i].getAttribute("name") == "twitter:image:src") { 
                return metas[i].getAttribute("content"); 
            }
        }
        return "";
    },
    run: function(arguments) {
    // Pass the baseURI of the webpage to the extension.
        arguments.completionFunction({"url": document.baseURI, "host": document.location.hostname, "title": document.title, "description": this.getDescription(), "image": this.getImage()});
    },
// Note that the finalize function is only available in iOS.
    finalize: function(arguments) {
        // arguments contains the value the extension provides in [NSExtensionContext completeRequestReturningItems:completion:].
    // In this example, the extension provides a color as a returning item.
    // document.body.style.backgroundColor = arguments["bgColor"];
    }
};

// The JavaScript file must contain a global object named "ExtensionPreprocessingJS".
var ExtensionPreprocessingJS = new MyExtensionJavaScriptClass;

// ExtensionPreprocessingJS.test();

Swift Code:

for item: AnyObject in (self.extensionContext?.inputItems)! {
    let inputItem = item as! NSExtensionItem

    for provider: AnyObject in inputItem.attachments! {
        let itemProvider = provider as! NSItemProvider

        if itemProvider.hasItemConformingToTypeIdentifier(kUTTypePropertyList as String) {
            itemProvider.loadItemForTypeIdentifier(kUTTypePropertyList as String, options: nil, completionHandler: { (result: NSSecureCoding?, error: NSError!) -> Void in
                if let resultDict = result as? NSDictionary {
                    self.articleTitle = resultDict[NSExtensionJavaScriptPreprocessingResultsKey]!["title"] as! String
                    self.articleHost = resultDict[NSExtensionJavaScriptPreprocessingResultsKey]!["host"] as! String
                    self.articleDesc = resultDict[NSExtensionJavaScriptPreprocessingResultsKey]!["description"] as! String
                    self.articleImage = resultDict[NSExtensionJavaScriptPreprocessingResultsKey]!["image"] as! String
                    self.articleUrl = resultDict[NSExtensionJavaScriptPreprocessingResultsKey]!["url"] as! String
                }
            })
        }
    }
}