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);
}