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如何用c#本地代码实现与Webbrowser中的JavaScript交互

2014-12-13 15:33 232 查看

关键词：.Net,Webbrowser,JavaScript,communication

参考：

[PermissionSet(SecurityAction.Demand, Name="FullTrust")]
[System.Runtime.InteropServices.ComVisibleAttribute(true)]
public class Form1 : Form
{
private void Form1_Load(object sender, EventArgs e)
{
webBrowser1.AllowWebBrowserDrop = false;
webBrowser1.IsWebBrowserContextMenuEnabled = false;
webBrowser1.WebBrowserShortcutsEnabled = false;
webBrowser1.ObjectForScripting = this;
// Uncomment the following line when you are finished debugging.
//webBrowser1.ScriptErrorsSuppressed = true;

webBrowser1.DocumentText =
"<html><head><script>" +
"function test(message) { alert(message); }" +
"</script></head><body><button " +
"onclick=\"window.external.Test('called from script code')\">" +
"call client code from script code</button>" +
"</body></html>";
}

public void Test(String message)
{
MessageBox.Show(message, "client code");
}

private void button1_Click(object sender, EventArgs e)
{
webBrowser1.Document.InvokeScript("test",
new String[] { "called from client code" });
}
}

链接0：codeproject中VB和js的交互

链接1：自定义数据类型的参数传递

代码：

dynamic data = webBrowser1.Document.InvokeScript("eval", new[] {
"(function() { return { latitude: 1, longitude: 2 }; })()" });

MessageBox.Show("Data: " + data.latitude + ", " + data.longitude);

链接：添加js到已加载的网页

代码：

private void addScript(HtmlElement head, string scriptSource)
{
HtmlElement lhe_script = head.Document.CreateElement("script");
IHTMLScriptElement script = (IHTMLScriptElement)lhe_script.DomElement;
script.src = scriptSource;
head.AppendChild(lhe_script);
}

addScript(Webbrowser.Head, @"<Change File Path here>jquery.min.js");
addScript(WebBrowser.Head, @"InjectMonitor.js");

Selenium则是一个利用http协议，来实现js和其他语言之间的通信，他强大的地方是js部分。

ide/main/src/content/selenium-runner.js

// overide _executeCurrentCommand so we can collect stats of the commands executed
_executeCurrentCommand : function() {
/**
* Execute the current command.
*
* @return a function which will be used to determine when
* execution can continue, or null if we can continue immediately
*/
var command = this.currentCommand;
LOG.info("Executing: |" + command.command + " | " + command.target + " | " + command.value + " |");

var handler = this.commandFactory.getCommandHandler(command.command);
if (handler == null) {
throw new SeleniumError("Unknown command: '" + command.command + "'");
}

command.target = selenium.preprocessParameter(command.target);
command.value = selenium.preprocessParameter(command.value);
LOG.debug("Command found, going to execute " + command.command);
updateStats(command.command);
this.result = handler.execute(selenium, command);
this.waitForCondition = this.result.terminationCondition;
},

selenium-api

CommandHandlerFactory

是Api核心，在

selenium-api.js

selenium-commandhandlers.js

文件中实现。

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