I'm looking for a way to get the JavaScript code defined inside of onclick. I'm using .NET 2.0 C# Visual Studio 2005.
Example:
<span id="foo" onclick+"window.location.href='someURL'>click here</span>
My goal is to get the string "window.location.href='someURL'".
Scenario:
A user clicks on web page element, the tag shown above for instance, inside of WebBrowser control. Then the clicked tag is refereed to HtmlElement object
.
In WebBrowser control I then call HtmlElement object's getAttribute("onclick")
, it just gives me "System.__ComObject".
I've searched how to deal with it then found that it can be casted then get the value.
if (tag.GetAttribute("onclick").Equals("System.__ComObject"))
{
Console.WriteLine("dom elem >>>>>>>>>>> " + tag.DomElement.ToString());
mshtml.HTMLSpanElementClass span = (mshtml.HTMLSpanElementClass)tag.DomElement;
Console.WriteLine("js value ===>" + span.onclick);
}
Output:
dom elem >>>>>>>>>>> mshtml.HTMLSpanElementClass
js value ===> System.__ComObject
As it shown, span.onclick still give me System.__ComObject, what am I doing wrong?
In Why does HtmlElement's GetAttribute() method return “mshtml.HTMLInputElementClass” instead of the attribute's value? this guy said it worked in his case, and I've followed it, but mine is somewhat not working...
UPDATE
Research, research.....
I can add reference VisualBasic.dll to my C# project then call the method to find out who is this System.__ComObject really is.
Console.WriteLine(Microsoft.VisualBasic.Information.TypeName(span.onclick));
Output:
JScriptTypeInfo
It looks like this is a JScript type... how can I access this object?
More detail
The above description is based on my current project. The project is to create something like Selenium IDE. It uses WebBrowser control instead.
Selenium IDE creates 3 different things to record an element in the web document.
1. actionType
2. xpath
3. value
For instance,
type, //input[@id=foo], "hello world"
clickAndWait, //link=login, ""
Selenium IDE recognize page load so it changes actionType between "click"
and "clickAndWait"
. My case, I want to make it simple.
If I click on the element and if it is anchor tag
or has page load kind of javascript
such as onclick=window.location.href='blah'
then I want to set the actionType to "clickAndWait"
.
There are number of ways you can do it.
Another alternative is to use a custom navigation url and act upon it
Another Alternative method is to use External object, WebBrowser allows you to set an ObjectForScripting which you can access within Javascript of HTML.
ObjectForScripting in .NET 2.0
[ComVisible(true)]
public class MyClass
{
// can be called from JavaScript
public void ShowMessageBox(string msg){
MessageBox.Show(msg);
}
}
myBrowser.ObjectForScripting = new MyClass();
// or you can reuse instance of MyClass
And you can call,
window.external.ShowMessageBox("This was called from JavaScript");