[英]How to handle Javascript events via WebBrowser control for WinForms
I have read WebBrowser Control from .Net — How to Inject Javascript , Is it possible to call Javascript method from C# winforms and many others. 我从.Net阅读了WebBrowser控件 - 如何注入Javascript , 是否可以从C#winforms和其他许多人调用Javascript方法 。 Those examples were returns function value or alert window (synchronous calls).
这些示例是返回函数值或警报窗口(同步调用)。 I have to get result from event handler (async call):
我必须从事件处理程序(异步调用)获取结果:
<script type="text/javascript">
window.onload = function() {
var o = new M.Build(document.getElementById("ZID"));
M.Events.observe(o, o.Events.Success, function() {
// I have to get some value!!
});
M.Events.observe(o, o.Events.Fault, function() {
// I have to get some value!!
});
}
</script>
Calling C# from JavaScript
从JavaScript调用C#
Simply put, you can expose a C# object to the WebBrowser that the JavaScript can call directly The WebBrowser class exposes a property called ObjectForScripting that can be set by your application and becomes the window.external object within JavaScript.
简单地说,您可以将C#对象公开给JavaScript可以直接调用的WebBrowser WebBrowser类公开一个名为ObjectForScripting的属性,该属性可以由您的应用程序设置并成为JavaScript中的window.external对象。 The object must have the ComVisibleAttribute set true
该对象必须将ComVisibleAttribute设置为true
C#: C#:
[System.Runtime.InteropServices.ComVisibleAttribute(true)]
public class ScriptInterface
{
public void callMe()
{
… // Do something interesting
}
}
webBrowser1.ObjectForScripting = new ScriptInterface();
Javascript: 使用Javascript:
window.external.callMe();
Calling JavaScript in a WebBrowser control from C# 从C#调用WebBrowser控件中的JavaScript
This is code I have. 这是我的代码。 In the DocumentCompleted event ('cause I'm getting a page from online)
在DocumentCompleted事件中(因为我从在线获取页面)
var wb = (WebBrowser)sender
//Lots of other stuff
object obj = wb.Document.InvokeScript("MyFunctionName");
Create a function that returns whatever value you need and invoke away. 创建一个函数,返回您需要的任何值并调用。
You can also inject a script into the page 您还可以将脚本注入页面
string js = "function MyFunctionName(){alert('Yea!');}";
HtmlElement el = wb.Document.CreateElement("script");
IHTMLScriptElement element2 = (IHTMLScriptElement)el.DomElement;
element2.text = js;
head.AppendChild(el);
which can then be invoked. 然后可以调用它。 That's what I've done.
这就是我所做的。
If your webBrowser control is in a form, you can do the following: 如果您的webBrowser控件位于表单中,则可以执行以下操作:
[System.Runtime.InteropServices.ComVisibleAttribute(true)]
public class Form1
{
public Form1()
{
InitializeComponent();
webBrowser1.ObjectForScripting = this;
}
public void CallMe()
{
//.... this method can be called in javascript via window.external.CallMe();
}
}
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