如何在不修改webbrowser控件中的文档的情况下注入并执行javascript函数？

Question

I could simply do :

object DomElement = ChooseMyDomElement(webBrowser1);  //this is a ID less element
webBrowser1.DocumentText = NewDocumentTextWithInjectedJavaScriptFunction;
webBrowser1.Document.InvokeScript("myfnc", DomElement);

However I don't want to make any modification to loaded document like set DocumentText , Create a new script element, etc..

Here is that I tried :

object DomElement = ChooseMyDomElement(webBrowser1);  //this is a ID less element
var js = "function myfnc(r) {alert(r);}  myfnc(" + DomElement +");"; //DomElement is converted to string!
webBrowser1.Document.InvokeScript("eval", new object[] { js });

The problem is that java sees DomElement as string!
I want to send DomElement object with a javascript function to do processing on DomElement in the script.

Answer 1

Try this:

void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
    var anyScripts = webBrowser1.Document.GetElementsByTagName("script");
    if (anyScripts == null || anyScripts.Count == 0)
    {
        // at least one <script> element must be present for eval to work
        var script = webBrowser1.Document.CreateElement("script");
        webBrowser1.Document.Body.AppendChild(script);
    }

    // use anonymous functions

    dynamic func = webBrowser1.Document.InvokeScript("eval", new[] { 
        "(function() { return function(elem, color) { elem.style.backgroundColor = color; } })()" });

    var body = this.webBrowser1.Document.Body.DomElement;

    func(body, "red");
}

Answer 2

这样的事情应该在控件中执行javascript，而无需更改文档：

 BrowserControl.Navigate("javascript:function test(){console.log('test');}test();")