WebView.evaluateJavascript

Asynchronously evaluate script in the script world with name world_name of the main frame current context in web_view. If world_name is null, the default world is used. Any value that is not null is a distinct world. The source_uri will be shown in exceptions and doesn't affect the behavior of the script. When not provided, the document URL is used.

Note that if #WebKitSettings:enable-javascript is false, this method will do nothing. If you want to use this method but still prevent web content from executing its own JavaScript, then use #WebKitSettings:enable-javascript-markup.

When the operation is finished, callback will be called. You can then call [webkit.web_view.WebView.evaluateJavascriptFinish] to get the result of the operation.

This is an example of using [webkit.web_view.WebView.evaluateJavascript] with a script returning a string:

static void
web_view_javascript_finished (GObject      *object,
                             GAsyncResult *result,
                             gpointer      user_data)
{
   JSCValue               *value;
   GError                 *error = NULL;

   value = webkit_web_view_evaluate_javascript_finish (WEBKIT_WEB_VIEW (object), result, &error);
   if (!value) {
       g_warning ("Error running javascript: %s", error->message);
       g_error_free (error);
       return;
   }

   if (jsc_value_is_string (value)) {
       gchar        *str_value = jsc_value_to_string (value);
       JSCException *exception = jsc_context_get_exception (jsc_value_get_context (value));
       if (exception)
           g_warning ("Error running javascript: %s", jsc_exception_get_message (exception));
       else
           g_print ("Script result: %s\n", str_value);
       g_free (str_value);
   } else {
       g_warning ("Error running javascript: unexpected return value");
   }
   g_object_unref (value);
}

static void
web_view_get_link_url (WebKitWebView *web_view,
                      const gchar   *link_id)
{
   gchar *script = g_strdup_printf ("window.document.getElementById('%s').href;", link_id);
   webkit_web_view_evaluate_javascript (web_view, script, -1, NULL, NULL, NULL, web_view_javascript_finished, NULL);
   g_free (script);
}