callAsyncJavascriptFunction
Asynchronously call @body with @arguments in the script world with name @world_name of the main frame current context in @web_view. The @arguments values must be one of the following types, or contain only the following GVariant types: number, string and dictionary. The result of the operation can be a Promise that will be properly passed to the callback. If @world_name is null, the default world is used. Any value that is not null is a distin ct 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_call_async_javascript_function_finish() to get the result of the operation.
This is an example that shows how to pass arguments to a JS function that returns a Promise that resolves with the passed argument:
static void
web_view_javascript_finished (GObject *object,
GAsyncResult *result,
gpointer user_data)
{
JSCValue *value;
GError *error = NULL;
value = webkit_web_view_call_async_javascript_function_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_number (value)) {
gint32 int_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: %d\n", int_value);
g_free (str_value);
} else {
g_warning ("Error running javascript: unexpected return value");
}
g_object_unref (value);
}
static void
web_view_evaluate_promise (WebKitWebView *web_view)
{
GVariantDict dict;
g_variant_dict_init (&dict, NULL);
g_variant_dict_insert (&dict, "count", "u", 42);
GVariant *args = g_variant_dict_end (&dict);
const gchar *body = "return new Promise((resolve) => { resolve(count); });";
webkit_web_view_call_async_javascript_function (web_view, body, -1, arguments, NULL, NULL, NULL, web_view_javascript_finished, NULL);
}Since
2.40
Parameters
the function body
length of @body, or -1 if @body is a nul-terminated string
a #GVariant with format a{sv} storing the function arguments, or null
the name of a #WebKitScriptWorld or null to use the default
the source URI
a #GCancellable or null to ignore
a #GAsyncReadyCallback to call when the script finished