我试图在运行时插入我自己的javascript来呈现HTML(index.html - 存在于IsolatedStorage中)。要从javascript拨打电话到c#webBrowser_ScriptNotify
。我将如何实现这一目标,这是我尝试实现这一目标。
string script = " <script type=\"text/javascript\"> function scriptNotify() { window.external.notify(\"runtime\");}</script>";
byte[] param = GetBytes(script);
webBrowser.Navigate(new Uri("/index.html", UriKind.Relative), param,"Content-Type: application/x-www-form-urlencoded");
private void webBrowser_ScriptNotify(object sender, NotifyEventArgs e)
{
if (e.Value.ToString().Equals("runtime"))
{
Debug.WriteLine("Call from dynamic javascript");
}
}
static byte[] GetBytes(string str)
{
byte[] bytes = new byte[str.Length * sizeof(char)];
System.Buffer.BlockCopy(str.ToCharArray(), 0, bytes, 0, bytes.Length);
return bytes;
}
更新
这里我尝试在当前打开的HTML页面中注入脚本标记。
var scriptString = "var script=document.createElement('script');"
+ "script.type=\"text/javascript\";"
+ "script.InnerHTML=\"function callMe(){window.external.notify(\"runtime\")};\""
+ "document.getElementsByTagName('head')[0].appendChild(script);";
webBrowser.InvokeScript("eval", scriptString);
因系统错误而失败。
System.SystemException was unhandled
Message: An unhandled exception of type 'System.SystemException' occurred in Microsoft.Phone.Interop.ni.dll
Additional information: An unknown error has occurred. Error: 80020101.
StackTrace:
at Microsoft.Phone.Controls.NativeMethods.ValidateHResult(Int32 hr)
at Microsoft.Phone.Controls.WebBrowserInterop.InvokeScript(String scriptName, String[] args)
at Microsoft.Phone.Controls.WebBrowser.InvokeScript(String scriptName, String[] args)
at WebBrowserJSTest.MainPage.webBrowser_LoadCompleted(Object sender, NavigationEventArgs e)
提前致谢。
答案 0 :(得分:1)
请注意,eval
已知在页面上至少有一个<script>
标记时才会生效。
以下解决方案使用webBrowser.InvokeScript("setTimeout", ...)
执行一些JavaScript(从而启用eval
)。我使用Windows应用商店应用测试了这种方法,它在那里工作。我希望它也适用于Windows Phone,希望你能够确认它。
async Task ExecScriptNotify()
{
// load a blank page
var tcsLoad = new TaskCompletionSource<object>();
this.webBrowser.NavigationCompleted += (s, eArgs) =>
tcsLoad.TrySetResult(Type.Missing);
this.webBrowser.NavigateToString("<body></body>");
await tcsLoad.Task;
// first add a script via "setTimeout", JavaScript gets initialized
var tcsInit = new TaskCompletionSource<object>();
this.webBrowser.ScriptNotify += (s, eArgs) =>
{
if (eArgs.Value == "initialized")
tcsInit.TrySetResult(Type.Missing);
};
this.webBrowser.InvokeScript("setTimeout",
new string[] { "window.external.notify('initialized')", "0" });
await tcsInit.Task;
// then use "eval"
this.webBrowser.InvokeScript("eval",
new string[] { "document.body.style.backgroundColor = 'yellow'" });
}
答案 1 :(得分:0)
答案 2 :(得分:0)
尝试这样的事情:
string script =&#34; //你的JS方法&#34 ;; string elementInnerText =(string)WebBrowser1.InvokeScript(&#34; eval&#34;,script);