## Popover
### Basic usage
Similar to Tooltip, Popover is also built with `Vue-popper`. So for some duplicated attributes, please refer to the documentation of Tooltip.
:::demo Add `ref` in your popover, then in your button, use `v-popover` directive to link the button and the popover. The attribute `trigger` is used to define how popover is triggered: `hover`, `click` or `focus`. Alternatively, you can specify reference using a named `slot`.
```html
Hover to activateClick to activateFocus to activate
```
:::
### Nested information
Other components can be nested in popover. Following is an example of nested table.
:::demo replace the `content` attribute with a default `slot`.
```html
Click to activate
```
:::
### Nested operation
Of course, you can nest other operations. It's more light-weight than using a dialog.
:::demo
```html
Are you sure to delete this?
cancelconfirm
Delete
```
:::
### Attributes
| Attribute | Description | Type | Accepted Values | Default |
|--------------------|----------------------------------------------------------|-------------------|-------------|--------|
| trigger | how the popover is triggered | string | click/focus/hover/manual | click |
| title | popover title | string | — | — |
| content | popover content, can be replaced with a default `slot` | string | — | — |
| width | popover width | string, number | — | Min width 150px |
| placement | popover placement | string | top/top-start/top-end/bottom/bottom-start/bottom-end/left/left-start/left-end/right/right-start/right-end | bottom |
| disabled | whether Popover is disabled | boolean | — | false |
| value(v-model) | whether popover is visible | Boolean | — | false |
| offset | popover offset | number | — | 0 |
| transition | popover transition animation | string | — | el-fade-in-linear |
| visible-arrow | whether a tooltip arrow is displayed or not. For more info, please refer to [Vue-popper](https://github.com/element-component/vue-popper) | boolean | — | true |
| popper-options | parameters for [popper.js](https://popper.js.org/documentation.html) | object | please refer to [popper.js](https://popper.js.org/documentation.html) | `{ boundariesElement: 'body', gpuAcceleration: false }` |
| popper-class | custom class name for popover | string | — | — |
| open-delay | delay of appearance when `trigger` is hover, in milliseconds | number | — | — |
### Slot
| Name | Description |
| --- | --- |
| — | text content of popover |
| reference | HTML element that triggers popover |
### Events
| Event Name | Description | 回调参数 |
|---------|--------|---------|
| show | triggers when popover shows | — |
| hide | triggers when popover hides | — |