CODEWITHSUNDEEP
javascriptwpfcommunication
Gab
Gab

Reputation: 1910

WPF WebBrowser - call methods in JavaScript

I'm developing a WPF application with only a WebBrowser that launch a HTML page with JavasCript. I also have some C# methods.

I'm looking for a good way to launch my C# methods in JavaScript, with parameters and if possible callbacks.

For now, I have JavaScript methods that navigate to special URL like "myApp://mymethod?param1=value&param2=value" and in the "Navigating" event of the webBrowser, I check the URL and call the method that I need with the parameters.

This solution works but the size of the URL is limited. How can I send heavier data ? (custom headers data, POST, cookies, local storage or anything else I don't know... :) )

I can't use window.external because in the end I will use Xamarin to do a cross-platforms app. WebBrowser will be for Windows, but IOS use UIWebView that dosen't support window.external ( stevesaxon.me/posts/2011/… ) so i need a solution that works everywhere and the custom URL has a size limit.

If somebody has a solution...

Upvotes: 2

Views: 3043

Answers (1)

Vlad Bezden
Vlad Bezden

Reputation: 89499

Please take a look at How to: Implement Two-Way Communication Between DHTML Code and Client Application Code

Basically you need to use window.external object in your scripting code to access public properties and methods

HTML Code:

<button onclick="window.external.Test('called from script code')">
    call client code from script code
</button>

C# Code in your WPF code:

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

Communication between WPF and JavaScript requires full trust, so you will need to add following code:

[PermissionSet(SecurityAction.Demand, Name = "FullTrust")]
[ComVisible(true)]
public class MainWindow
{
        public void Test(String message)
    {
        MessageBox.Show(message, "client code");
    }
}

Upvotes: 1

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