## Tooltip

Display prompt information for mouse hover.

### Basic usage

Tooltip has 9 placements.

:::demo Use attribute `content` to set the display content when hover. The attribute `placement` determines the position of the tooltip. Its value is `[orientation]-[alignment]` with four orientations `top`, `left`, `right`, `bottom` and three alignments `start`, `end`, `null`, and the default alignment is null. Take `placement="left-end"` for example, Tooltip will display on the left of the element which you are hovering and the bottom of the tooltip aligns with the bottom of the element.

```html
<div class="box">
  <div class="top">
    <el-tooltip
      class="item"
      effect="dark"
      content="Top Left prompts info"
      placement="top-start"
    >
      <el-button>top-start</el-button>
    </el-tooltip>
    <el-tooltip
      class="item"
      effect="dark"
      content="Top Center prompts info"
      placement="top"
    >
      <el-button>top</el-button>
    </el-tooltip>
    <el-tooltip
      class="item"
      effect="dark"
      content="Top Right prompts info"
      placement="top-end"
    >
      <el-button>top-end</el-button>
    </el-tooltip>
  </div>
  <div class="left">
    <el-tooltip
      class="item"
      effect="dark"
      content="Left Top prompts info"
      placement="left-start"
    >
      <el-button>left-start</el-button>
    </el-tooltip>
    <el-tooltip
      class="item"
      effect="dark"
      content="Left Center prompts info"
      placement="left"
    >
      <el-button>left</el-button>
    </el-tooltip>
    <el-tooltip
      class="item"
      effect="dark"
      content="Left Bottom prompts info"
      placement="left-end"
    >
      <el-button>left-end</el-button>
    </el-tooltip>
  </div>

  <div class="right">
    <el-tooltip
      class="item"
      effect="dark"
      content="Right Top prompts info"
      placement="right-start"
    >
      <el-button>right-start</el-button>
    </el-tooltip>
    <el-tooltip
      class="item"
      effect="dark"
      content="Right Center prompts info"
      placement="right"
    >
      <el-button>right</el-button>
    </el-tooltip>
    <el-tooltip
      class="item"
      effect="dark"
      content="Right Bottom prompts info"
      placement="right-end"
    >
      <el-button>right-end</el-button>
    </el-tooltip>
  </div>
  <div class="bottom">
    <el-tooltip
      class="item"
      effect="dark"
      content="Bottom Left prompts info"
      placement="bottom-start"
    >
      <el-button>bottom-start</el-button>
    </el-tooltip>
    <el-tooltip
      class="item"
      effect="dark"
      content="Bottom Center prompts info"
      placement="bottom"
    >
      <el-button>bottom</el-button>
    </el-tooltip>
    <el-tooltip
      class="item"
      effect="dark"
      content="Bottom Right prompts info"
      placement="bottom-end"
    >
      <el-button>bottom-end</el-button>
    </el-tooltip>
  </div>
</div>

<style>
  .box {
    width: 400px;

    .top {
      text-align: center;
    }

    .left {
      float: left;
      width: 110px;
    }

    .right {
      float: right;
      width: 110px;
    }

    .bottom {
      clear: both;
      text-align: center;
    }

    .item {
      margin: 4px;
    }

    .left .el-tooltip__popper,
    .right .el-tooltip__popper {
      padding: 8px 10px;
    }

    .el-button {
      width: 110px;
    }
  }
</style>
```

:::

### Theme

Tooltip has two themes: `dark` and `light`。

:::demo Set `effect` to modify theme, and the default value is `dark`.

```html
<el-tooltip content="Top center" placement="top">
  <el-button>Dark</el-button>
</el-tooltip>
<el-tooltip content="Bottom center" placement="bottom" effect="light">
  <el-button>Light</el-button>
</el-tooltip>
```

:::

### More Content

Display multiple lines of text and set their format.

:::demo Override attribute `content` of `el-tooltip` by adding a slot named `content`.

```html
<el-tooltip placement="top">
  <template #content> multiple lines<br />second line </template>
  <el-button>Top center</el-button>
</el-tooltip>
```

:::

### Advanced usage

In addition to basic usages, there are some attributes that allow you to customize your own:

`transition` attribute allows you to customize the animation in which the tooltip shows or hides, and the default value is el-fade-in-linear.

`disabled` attribute allows you to disable `tooltip`. You just need set it to `true`.

In fact, Tooltip is an extension based on [Vue-popper](https://github.com/element-component/vue-popper), you can use any attribute that are allowed in Vue-popper.

:::demo

```html
<template>
  <el-tooltip
    :disabled="disabled"
    content="click to close tooltip function"
    placement="bottom"
    effect="light"
  >
    <el-button @click="disabled = !disabled"
      >click to {{disabled ? 'active' : 'close'}} tooltip function</el-button
    >
  </el-tooltip>
</template>

<script>
  export default {
    data() {
      return {
        disabled: false,
      }
    },
  }
</script>

<style>
  .slide-fade-enter-active {
    transition: all 0.3s ease;
  }
  .slide-fade-leave-active {
    transition: all 0.3s cubic-bezier(1, 0.5, 0.8, 1);
  }
  .slide-fade-enter,
  .expand-fade-leave-active {
    margin-left: 20px;
    opacity: 0;
  }
</style>
```

:::

:::tip
The `router-link` component is not supported in tooltip, please use `vm.$router.push`.

Disabled form elements are not supported for Tooltip, more information can be found at [MDN](https://developer.mozilla.org/en-US/docs/Web/Events/mouseenter). You need to wrap the disabled form element with a container element for Tooltip to work.
:::

### Attributes

| Attribute             | Description                                                                                                                   | Type    | Accepted Values                                                                                           | Default                                                 |
| --------------------- | ----------------------------------------------------------------------------------------------------------------------------- | ------- | --------------------------------------------------------------------------------------------------------- | ------------------------------------------------------- |
| append-to-body        | whether to append Dialog itself to body. A nested Dialog should have this attribute set to `true`                             | boolean | —                                                                                                         | true                                                    |
| effect                | Tooltip theme                                                                                                                 | string  | dark/light                                                                                                | dark                                                    |
| content               | display content, can be overridden by `slot#content`                                                                          | String  | —                                                                                                         | —                                                       |
| placement             | position of Tooltip                                                                                                           | string  | top/top-start/top-end/bottom/bottom-start/bottom-end/left/left-start/left-end/right/right-start/right-end | bottom                                                  |
| model-value / v-model | visibility of Tooltip                                                                                                         | boolean | —                                                                                                         | false                                                   |
| disabled              | whether Tooltip is disabled                                                                                                   | boolean | —                                                                                                         | false                                                   |
| offset                | offset of the Tooltip                                                                                                         | number  | —                                                                                                         | 0                                                       |
| transition            | animation name                                                                                                                | string  | —                                                                                                         | el-fade-in-linear                                       |
| visible-arrow         | whether an arrow is displayed. For more information, check [Vue-popper](https://github.com/element-component/vue-popper) page | boolean | —                                                                                                         | true                                                    |
| popper-options        | [popper.js](https://popper.js.org/documentation.html) parameters                                                              | Object  | refer to [popper.js](https://popper.js.org/documentation.html) doc                                        | `{ boundariesElement: 'body', gpuAcceleration: false }` |
| show-after            | delay of appearance, in millisecond                                                                                           | number  | —                                                                                                         | 0                                                       |
| hide-after            | delay of disappear, in millisecond                                                                                            | number  | —                                                                                                         | 0                                                       |
| auto-close            | timeout in milliseconds to hide tooltip                                                                                       | number  | —                                                                                                         | 0                                                       |
| manual                | whether to control Tooltip manually. `mouseenter` and `mouseleave` won't have effects if set to `true`                        | boolean | —                                                                                                         | false                                                   |
| popper-class          | custom class name for Tooltip's popper                                                                                        | string  | —                                                                                                         | —                                                       |
| enterable             | whether the mouse can enter the tooltip                                                                                       | Boolean | —                                                                                                         | true                                                    |
| tabindex              | [tabindex](https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/tabindex) of Tooltip                           | number  | —                                                                                                         | 0                                                       |