當用戶訪問你的網站時，他們會做一些事情，比如點擊各種連結，將滑鼠移到文本和圖像上等等。這些是我們在JavaScript和VBScript術語中稱之爲事件的例子。
我們可以使用JavaScript或VBScript編寫事件處理程序，並可以指定對這些事件採取的一些操作。雖然這些是事件，但它們將被指定爲HTML標記的屬性。
HTML 4.01規範定義了19個事件，但後來的HTML-5添加了許多其他事件，我們在下面列出了這些事件;
Window Events Attributes
在較舊版本的HTML中引入了以下事件，但所有標記爲的標記都是HTML-5的一部分。
| Events | HTML-5 | Description |
|---|---|---|
| onafterprint |  |
Triggers after a document is printed |
| onbeforeprint | |
Triggers before a document is printed |
| onbeforeonload | |
Triggers before a document loads |
| onerror | |
Triggers when an error occurs |
| onhaschange | |
Triggers when a document has changed |
| onload | Triggers when a document loads | |
| onmessage | |
Triggers when a message is triggered |
| onoffline | |
Triggers when a document goes offline |
| ononline | |
Triggers when a document comes online |
| onpagehide | |
Triggers when a window is hidden |
| onpageshow | |
Triggers when a window becomes visible |
| onpopstate | |
Triggers when a window's history changes |
| onredo | |
Triggers when a document performs a redo |
| onresize | |
Triggers when a window is resized |
| onstorage | |
Triggers when a document loads |
| onundo | |
Triggers when a document performs an undo |
| onunload | Triggers when a user leaves the document |
Form Events
在較舊版本的HTML中引入了以下標記，但所有標記爲的標記都是HTML-5的一部分。
| Events | HTML-5 | Description |
|---|---|---|
| onblur | Triggers when a window loses focus | |
| onchange | Triggers when an element changes | |
| oncontextmenu | |
Triggers when a context menu is triggered |
| onfocus | Triggers when a window gets focus | |
| onformchange | |
Triggers when a form changes |
| onforminput | |
Triggers when a form gets user input |
| oninput | |
Triggers when an element gets user input |
| oninvalid | |
Triggers when an element is invalid |
| onreset | Triggers when a form is reset | |
| onselect | Triggers when an element is selected | |
| onsubmit | Triggers when a form is submitted |
Keyboard Events
| Events | HTML-5 | Description |
|---|---|---|
| onkeydown | Triggers when a key is pressed | |
| onkeypress | Triggers when a key is pressed and released | |
| onkeyup | Triggers when a key is released |
Mouse Events
在較舊版本的HTML中引入了以下標記，但所有標記爲的標記都是HTML-5的一部分。
| Events | HTML-5 | Description |
|---|---|---|
| onclick | Triggers on a mouse click | |
| ondblclick | Triggers on a mouse double-click | |
| ondrag | |
Triggers when an element is dragged |
| ondragend | |
Triggers at the end of a drag operation |
| ondragenter | |
Triggers when an element has been dragged to a valid drop target |
| ondragleave | |
Triggers when an element leaves a valid drop target |
| ondragover | |
Triggers when an element is being dragged over a valid drop target |
| ondragstart | |
Triggers at the start of a drag operation |
| ondrop | |
Triggers when a dragged element is being dropped |
| onmousedown | Triggers when a mouse button is pressed | |
| onmousemove | Triggers when the mouse pointer moves | |
| onmouseout | Triggers when the mouse pointer moves out of an element | |
| onmouseover | Triggers when the mouse pointer moves over an element | |
| onmouseup | Triggers when a mouse button is released | |
| onmousewheel | |
Triggers when the mouse wheel is being rotated |
| onscroll | |
Triggers when an element's scrollbar is being scrolled |
Media Events
在較舊版本的HTML中引入了以下標記，但所有標記爲的標記都是HTML-5的一部分。