我可以在Awesomium中调用JavaScript中的应用程序方法吗？

Question

我在互联网上寻找答案,但我必须提出错误的问题.我有一个带有Awesomium网页控件的C#winforms应用程序.我能够从加载的页面中的javascript调用应用程序中定义的方法吗？如果是这样,怎么样？(样本js代码将不胜感激).谢谢!

Answer 1

该方法取决于您使用的Awesomium版本.在即将发布的1.7版本(目前为1.7 RC3)中如何完成以及如何完成之前已经有了一些变化.请注意,1.7中有一个改进,因为当JS调用应用程序上的方法时,.NET方法现在可以返回值.我不认为在1.7之前这是可能的.

以下是两种方法:

test.html(用于两个版本)

...
<script type="text/javascript">

    function myMethod() {
        document.write("In myMethod, calling .NET but expecting no return value.<br/>");

        jsobject.callNETNoReturn();
    }

    function myMethodExpectingReturn() {
        document.write("In myMethodExpectingReturn, calling .NET and expecting return value.<br/>");

        var returnVal2 = jsobject.callNETWithReturn("foo");
        document.write("Got value from .NET: " + returnVal2 + "<br/>");
    }

    function myMethodProvidingReturn(whatToReturn) {
        var returnVal =  whatToReturn + "bar";
        document.write("Returning '" + returnVal + "' to .NET.");

        return returnVal;
    }
</script>
...

版本1.7

Form1.cs的

public Form1()
{
    InitializeComponent();

    //webView is an instance of WebControl defined in your form
    webView.DocumentReady += WebViewOnDocumentReady;

    webView.Source = new Uri("test.html");
}

private void WebViewOnDocumentReady(object sender, UrlEventArgs urlEventArgs)
{
    webView.DocumentReady -= WebViewOnDocumentReady;

    JSObject jsobject = webView.CreateGlobalJavascriptObject("jsobject");

    jsobject.Bind("callNETNoReturn", false, JSHandler);
    jsobject.Bind("callNETWithReturn", true, JSHandler);

    webView.ExecuteJavascript("myMethod()");
    webView.ExecuteJavascript("myMethodExpectingReturn()");
    var result = webView.ExecuteJavascriptWithResult("myMethodProvidingReturn('foo')");
    Console.WriteLine(result.ToString());
}

private void JSHandler(object sender, JavascriptMethodEventArgs args)
{
    if (args.MustReturnValue)
    {
        Console.WriteLine("Got method call with return request");
        args.Result = "Returning " + args.Arguments[0];
    }
    else
    {
        Console.WriteLine("Got method call with no return request");
    }
}

版本1.6

Form.cs

public Form1()
{
    InitializeComponent();

    //webView is an instance of WebControl defined in your form
    webView.DomReady += WebViewOnDomReady;

    webView.Source = new Uri("test.html");
}

private void WebViewOnDomReady(object sender, EventArgs eventArgs)
{
    webView.DomReady -= WebViewOnDomReady;

    webView.CreateObject("jsobject");
    webView.SetObjectCallback("jsobject", "callNETNoReturn", JSHandler);

    webView.ExecuteJavascript("myMethod()");

    var result = webView.ExecuteJavascriptWithResult("myMethodProvidingReturn('foo')");
    Console.WriteLine(result.ToString());
}

private void JSHandler(object sender, JSCallbackEventArgs args)
{
    Console.WriteLine("Got method call with no return request");
}