我可以在Awesomium调用应用程序的方法从JavaScript?(Can I call appl

2019-07-03 16:19发布

我已经冲刷互联网寻找一个答案,但我一定要问错了问题。 我有与Awesomium网络控制一个C#WinForms应用程序。 我能够调用在加载的页面中应用程序中定义的JavaScript方法? 如果是这样,怎么样? (样品js代码将不胜感激)。 谢谢!

Answer 1:

该方法依赖于它Awesomium的版本,您正在使用。 还有的是一点是如何在即将到来的1.7版本(目前为1.7 RC3)做的改变,它是如何做之前。 请注意,在1.7一个改进,在.NET方法现在可以返回值时,JS调用您的应用程序的方法。 我不相信到1.7,这是可能的之前。

这里有两种方法:

的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>
...

1.7版

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");
    }
}

1.6版

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");
}


Answer 2:

在C ++:(在.NET绑定将可能是相似的)

定义一个回调类:

class TestListener : public Awesomium::WebViewListener {
public:
    virtual void onCallback(
        Awesomium::WebView* caller,
        const std::wstring& objectName,
        const std::wstring& callbackName,
        const Awesomium::JSArguments& args
    ) {
        if (objectName == L"myApi" && callbackName == L"doMagicFoo") {
            cout << "callback called with " << args.size() << " args\n";
        }
    }

    //...implement all the other pure virtual functions...  
};

然后,当您设置的WebView:

TestListener bob;
webView->setListener(&bob);
webView->createObject(L"myApi");
webView->setObjectCallback(L"myApi", L"doMagicFoo");

然后在你的HTML / JS:

<button onclick="myApi.doMagicFoo('super', 45)">do native call</button>


Answer 3:

对于新版本

从JavaScript调用:

webControl1.LoadingFrameComplete += LoadingFramecompleted;

public void LoadingFramecompleted(object sender, FrameEventArgs e){
    //after loading complete create global object
    JSObject obj = webControl1.CreateGlobalJavascriptObject("jsobject");
    obj.Bind(myMethod);
}

private JSValue myMethod(object sender, JavascriptMethodEventArgs e)
{
    MessageBox.Show("hello world");
    return "My response";
}

里面的JavaScript

jsobject.myMethod(); //myMethod is the method name defined in c#

要调用JavaScript

webControl1.ExecuteJavascript("SayHello()");


文章来源: Can I call application methods from JavaScript in Awesomium?