如何使用Windows 10 UWP

时间:2017-04-18 18:19:19

标签: javascript windows uwp notify appdata

由于文件编写安全问题,我们尝试将应用程序从使用ms-appx-web:切换为使用ms-appdata:。但它立即失败,因为我们依赖于window.external.notify(),它可以与ms-appx-web一起工作:但似乎表现为ms-appdata的无操作:作为测试,我们将以下html加载到WebView对象中:

<html>
<head>
    <script>
        function demofunc( str ) {
            document.getElementById("demo").innerHTML += str;
            window.external.notify( str );
        }
    </script>
</head>
<body onLoad="demofunc('demofunc()');">
    demo &lt;body&gt;
    <div id="demo"></div>
</body>
</html>

产生这个结果:

demo <body> 
demofunc()

但是,不会产生任何类型的弹出消息。为什么?显然,调用demofunc()方法在demo div中添加第二行输出,但window.external.notify()不会产生弹出消息。有没有关于notify()和ms-appdata的特殊规则:?

更新 - 问题Can't run javascript alerts in universal app's webview at payment gateway类似,适用于ms-appx-web:但不适用于ms-appdata:。该问题捕获ScriptNotify(),然后使用Windows.UI.Popups.MessageDialog弹出一个对话框。使用ms-appx-web:调用ScriptNotify()但使用ms-appdata:不调用ScriptNotify()。这是我们的问题,没有弹出窗口。

1 个答案:

答案 0 :(得分:1)

  

但它立即失败,因为我们依赖于window.external.notify(),它可以与ms-appx-web一起工作:但似乎表现为ms-appdata的无操作:。

对于您的方案,请使用方案ms-local-stream:///,而不是ms-appdata:///。我已经测试了ms-local-stream:///方案,它运行得很好。

要使用NavigateToLocalStreamUri方法,您必须传入一个将URI模式转换为内容流的IUriToStreamResolver实现。请参考以下代码。

<强> StreamUriWinRTResolver

public sealed class StreamUriWinRTResolver : IUriToStreamResolver
    {
        /// <summary>
        /// The entry point for resolving a Uri to a stream.
        /// </summary>
        /// <param name="uri"></param>
        /// <returns></returns>
        public IAsyncOperation<IInputStream> UriToStreamAsync(Uri uri)
        {
            if (uri == null)
            {
                throw new Exception();
            }
            string path = uri.AbsolutePath;
            // Because of the signature of this method, it can't use await, so we
            // call into a separate helper method that can use the C# await pattern.
            return getContent(path).AsAsyncOperation();
        }

        /// <summary>
        /// Helper that maps the path to package content and resolves the Uri
        /// Uses the C# await pattern to coordinate async operations
        /// </summary>
        private async Task<IInputStream> getContent(string path)
        {
            // We use a package folder as the source, but the same principle should apply
            // when supplying content from other locations
            try
            {
                Uri localUri = new Uri("ms-appdata:///local" + path);
                StorageFile f = await StorageFile.GetFileFromApplicationUriAsync(localUri);
                IRandomAccessStream stream = await f.OpenAsync(FileAccessMode.Read);
                return stream.GetInputStreamAt(0);
            }
            catch (Exception) { throw new Exception("Invalid path"); }
        }
    }

<强>的MainPage

public MainPage()
 {
     this.InitializeComponent();
     MyWebView.ScriptNotify += MyWebView_ScriptNotify;
     Uri url = MyWebView.BuildLocalStreamUri("MyTag", "/Test/HomePage.html");
     StreamUriWinRTResolver myResolver = new StreamUriWinRTResolver();
     MyWebView.NavigateToLocalStreamUri(url, myResolver);
 }

我已将code sample上传到github。请检查。

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