如何通过 WinForms 的 WebBrowser 控件处理 Javascript 事件
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/5167522/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
How to handle Javascript events via WebBrowser control for WinForms
提问by garik
I have read WebBrowser Control from .Net — How to Inject Javascript, Is it possible to call Javascript method from C# winformsand many others. Those examples were returns function value or alert window (synchronous calls). I have to get result from event handler (async call):
我已经阅读了 .Net 中的 WebBrowser Control - How to Inject Javascript，Is it possible to call Javascript method from C# winformsand many others。这些示例是返回函数值或警报窗口（同步调用）。我必须从事件处理程序（异步调用）中获取结果：
<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>
回答by garik
Calling C# from JavaScript
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. The object must have the ComVisibleAttribute set true
从 JavaScript 调用 C#
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，该属性可由您的应用程序设置，并成为 JavaScript 中的 window.external 对象。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:
Javascript：
window.external.callMe();
回答by QuinnG
This is code I have. In the DocumentCompleted event ('cause I'm getting a page from online)
这是我有的代码。在 DocumentCompleted 事件中（因为我从网上获取页面）
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，该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. That's what I've done.
然后可以调用。这就是我所做的。
回答by Ahmad
If your webBrowser control is in a form, you can do the following:
如果您的 webBrowser 控件在表单中，您可以执行以下操作：
[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();
}
}
