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This feature is well established and works across many devices and browser versions. It’s been available across browsers since июль 2015 г..
Событие loadstart происходит, когда начинается загрузка.
ProgressEvent
РаспространяетсяНет
ОтменяемоеНет
ЦельElement
Действие по умолчаниюНет
| target Только для чтения | EventTarget | The event target (the topmost target in the DOM tree). |
| type Только для чтения | DOMString | The type of event. |
| bubbles Только для чтения | Boolean | Whether the event normally bubbles or not. |
| cancelable Только для чтения | Boolean | Whether the event is cancellable or not. |
| lengthComputable Только для чтения | Boolean | Specifies whether or not the total size of the transfer is known. Read only. |
| loaded Только для чтения | unsigned long (long) | The number of bytes transferred since the beginning of the operation. This doesn't include headers and other overhead, but only the content itself. Read only. |
| total Только для чтения | unsigned long (long) | The total number of bytes of content that will be transferred during the operation. If the total size is unknown, this value is zero. Read only. |
This page was last modified on 29 авг. 2025 г. by MDN contributors.
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