datatransferitemlist-clear.html

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This WPT test may be referenced by the following Test IDs:
- /html/editing/dnd/datastore/datatransferitemlist-clear.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>DataTransferItemList.clear() in the read/write mode removes all items</title>

<link rel="help" href="https://html.spec.whatwg.org/multipage/dnd.html#dom-datatransferitemlist-clear">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script>

test(t => {

    const dataTransfer = new DataTransfer();

    dataTransfer.items.add('hello', 'text/plain');

    dataTransfer.items.add('<b>hello</b>', 'text/html');

    assert_equals(dataTransfer.items.length, 2, 'two string items were added');

    dataTransfer.items.clear();

    assert_equals(dataTransfer.items.length, 0, 'clear() removed every item');

    assert_equals(dataTransfer.types.length, 0, 'clear() removed every type');

    assert_equals(dataTransfer.getData('text/plain'), '', 'the text/plain data is gone');

}, 'clear() removes string items from a read/write drag data store');

test(t => {

    const dataTransfer = new DataTransfer();

    dataTransfer.items.add('hello', 'text/plain');

    dataTransfer.items.add(new File(['contents'], 'file.txt', { type: 'text/plain' }));

    assert_equals(dataTransfer.items.length, 2, 'one string item and one file item were added');

    assert_equals(dataTransfer.files.length, 1, 'the file item is exposed through files');

    dataTransfer.items.clear();

    assert_equals(dataTransfer.items.length, 0, 'clear() removed every item');

    assert_equals(dataTransfer.files.length, 0, 'clear() emptied the file list');

}, 'clear() removes file items from a read/write drag data store');

</script>