evaluate_javascript

Asynchronously evaluate script in the script world with name world_name of the main frame current context in this.

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 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 enable_javascript_markup.

When the operation is finished, callback will be called. You can then call evaluate_javascript.end to get the result of the operation.

This is an example of using evaluate_javascript with a script returning a string:

```c 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"); } webkit_javascript_result_unref (js_result); }

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); } ```

Parameters: