The loadstart event is fired when progress has begun on the loading of a resource. This applies for example to XMLHttpRequest calls, and to the content of an <img> or <video> element.
HTMLImageElement, for example| Property | Type | Description |
|---|---|---|
target Read only
| EventTarget | The event target (the topmost target in the DOM tree). |
type Read only
| DOMString | The type of event. |
bubbles Read only
| Boolean | Whether the event normally bubbles or not |
cancelable Read only
| Boolean | Whether the event is cancellable or not? |
lengthComputable | boolean | Specifies whether or not the total size of the transfer is known. Read only. |
loaded | 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 | 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. |
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https://developer.mozilla.org/en-US/docs/Web/Events/loadstart