packages/cross_file/lib/src/web_helpers/web_helpers.dart

// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'dart:html';

/// Create anchor element with download attribute
AnchorElement createAnchorElement(String href, String suggestedName) {
  final element = AnchorElement(href: href);

  if (suggestedName == null) {
    element.download = 'download';
  } else {
    element.download = suggestedName;
  }

  return element;
}

/// Add an element to a container and click it
void addElementToContainerAndClick(Element container, Element element) {
  // Add the element and click it
  // All previous elements will be removed before adding the new one
  container.children.add(element);
  element.click();
}

/// Initializes a DOM container where we can host elements.
Element ensureInitialized(String id) {
  var target = querySelector('#${id}');
  if (target == null) {
    final Element targetElement = Element.tag('flt-x-file')..id = id;

    querySelector('body').children.add(targetElement);
    target = targetElement;
  }
  return target;
}