1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
|
---
title: 'XMLHttpRequest: progress イベント'
slug: Web/API/XMLHttpRequest/progress_event
tags:
- API
- イベント
- ProgressEvent
- リファレンス
- ウェブ
- XMLHttpRequest
- progress
browser-compat: api.XMLHttpRequest.progress_event
translation_of: Web/API/XMLHttpRequest/progress_event
---
{{APIRef}}
**`progress`** イベントは、リクエストがもっとデータを受信した際に定期的に発行されます。
<table class="properties">
<tbody>
<tr>
<th scope="row">バブリング</th>
<td>なし</td>
</tr>
<tr>
<th scope="row">キャンセル可能</th>
<td>不可</td>
</tr>
<tr>
<th scope="row">インターフェイス</th>
<td>{{domxref("ProgressEvent")}}</td>
</tr>
<tr>
<th scope="row">イベントハンドラープロパティ</th>
<td>
{{domxref("XMLHttpRequestEventTarget/onprogress", "onprogress")}}
</td>
</tr>
</tbody>
</table>
## 例
### ライブデモ
#### HTML
```html
<div class="controls">
<input class="xhr success" type="button" name="xhr" value="Click to start XHR (success)" />
<input class="xhr error" type="button" name="xhr" value="Click to start XHR (error)" />
<input class="xhr abort" type="button" name="xhr" value="Click to start XHR (abort)" />
</div>
<textarea readonly class="event-log"></textarea>
```
```css hidden
.event-log {
width: 25rem;
height: 4rem;
border: 1px solid black;
margin: .5rem;
padding: .2rem;
}
input {
width: 11rem;
margin: .5rem;
}
```
#### JS
```js
const xhrButtonSuccess = document.querySelector('.xhr.success');
const xhrButtonError = document.querySelector('.xhr.error');
const xhrButtonAbort = document.querySelector('.xhr.abort');
const log = document.querySelector('.event-log');
function handleEvent(e) {
log.textContent = log.textContent + `${e.type}: ${e.loaded} bytes transferred\n`;
}
function addListeners(xhr) {
xhr.addEventListener('loadstart', handleEvent);
xhr.addEventListener('load', handleEvent);
xhr.addEventListener('loadend', handleEvent);
xhr.addEventListener('progress', handleEvent);
xhr.addEventListener('error', handleEvent);
xhr.addEventListener('abort', handleEvent);
}
function runXHR(url) {
log.textContent = '';
const xhr = new XMLHttpRequest();
addListeners(xhr);
xhr.open("GET", url);
xhr.send();
return xhr;
}
xhrButtonSuccess.addEventListener('click', () => {
runXHR('https://raw.githubusercontent.com/mdn/content/main/files/en-us/_wikihistory.json');
});
xhrButtonError.addEventListener('click', () => {
runXHR('http://i-dont-exist');
});
xhrButtonAbort.addEventListener('click', () => {
runXHR('https://raw.githubusercontent.com/mdn/content/main/files/en-us/_wikihistory.json').abort();
});
```
#### 結果
{{ EmbedLiveSample('Live_example', '100%', '150px') }}
## 仕様書
{{Specifications}}
## ブラウザーの互換性
{{Compat}}
## 関連情報
- 関連イベント: {{domxref("XMLHttpRequest/loadstart_event", "loadstart")}}, {{domxref("XMLHttpRequest/load_event", "load")}}, {{domxref("XMLHttpRequest/loadend_event", "loadend")}}, {{domxref("XMLHttpRequest/error_event", "error")}}, {{domxref("XMLHttpRequest/abort_event", "abort")}}
- [進捗の監視](/ja/docs/Web/API/XMLHttpRequest/Using_XMLHttpRequest#monitoring_progress)
|
