# refresh

>  **NOTE**
>
>  This component is supported since API version 4. Updates will be marked with a superscript to indicate their earliest API version.

The **<refresh\>** component is used to refresh a page through a pull-down gesture.

## Required Permissions

None


## Child Components

Supported


## Attributes

In addition to the [universal attributes](js-components-common-attributes.md), the following attributes are supported.

| Name| Type| Default Value| Mandatory| Description|
| -------- | -------- | -------- | -------- | -------- |
| offset | &lt;length&gt; | - | No| Distance to the top of the parent component from the **<refresh\>** component that comes to rest after a successful pull-down gesture.|
| refreshing | boolean | false | No| Whether the **\<refresh>** component is being used for refreshing.|
| type | string | auto | No| Dynamic effect when the component is refreshed. Two options are available and cannot be modified dynamically.<br>- **auto**: default effect. When the list is pulled to the top, the list does not move. When the list is pulled to the bottom, a circle is displayed.<br>- **pulldown**: When the list is pulled to the top, users can continue to pull down to trigger a refresh. The rebound effect will appear after the refresh. If the child component contains a list, set **scrolleffect** of the list to **no** to prevent drop-down effect conflicts.|
| lasttime | boolean | false | No| Whether to display the last update time. The character string format is **last update time: XXXX**, where **XXXX** is displayed based on the certain time and date formats and cannot be dynamically modified. (It is recommended that this attribute be used when **type** is set to **pulldown**. The fixed distance is at the bottom of the content drop-down area. Pay attention to the **offset** attribute setting to prevent overlapping.)|
| timeoffset<sup>6+</sup> | &lt;length&gt; | - | No| Distance between the update time and the top of the parent component.|
| friction | number | 42 | No| Pull-down friction coefficient. The value ranges from 0 to 100. A larger value indicates a more responsive component. For example, if a user pulls the component down 100 px, it will actually move 100 * **friction**% px.|


## Styles

In addition to the [universal styles](js-components-common-styles.md), the following styles are supported.

| Name| Type| Default Value| Mandatory| Description|
| -------- | -------- | -------- | -------- | -------- |
| background-color | &lt;color&gt; | white<br>| No| Background color of the **\<refresh>** component.|
| progress-color | &lt;color&gt; | black<br>| No| Color of the loading icon of the **\<refresh>** component.|


## Events

The following events are supported.

| Name| Parameter| Description|
| -------- | -------- | -------- |
| refresh | { refreshing: refreshingValue } | Triggered when the **\<refresh>** component is pulled down and the refresh status changes. Available values are as follows:<br>- **false**: The **\<refresh>** component is being pulled down.<br>- **true**: The **\<refresh>** component is not being pulled down.|
| pulldown | { state: string } | Triggered when a user starts or stops pulling down the **\<refresh>** component. Available values are as follows:<br>- **start**: The pull-down starts.<br>- **end**: The pull-down ends.|


## Methods

The [universal methods](js-components-common-methods.md) are not supported.


## Example

```html
<!-- xxx.hml -->
<div class="container">
  <refresh refreshing="{{fresh}}" onrefresh="refresh">
    <list class="list" scrolleffect="no">
      <list-item class="listitem" for="list">
        <div class="content">
          <text class="text">{{$item}}</text>
        </div>
      </list-item>
    </list>
  </refresh>
</div>
```

```css
/* xxx.css */
.container {
  flex-direction: column;
  align-items: center;
  width: 100%;
  height: 100%;
}

.list {
  width: 100%;
  height: 100%;
}

.listitem {
  width: 100%;
  height: 150px;
}

.content {
  width: 100%;
  height: 100%;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.text {
  font-size: 35px;
  font-weight: bold;
}
```

```js
// xxx.js
import promptAction from '@ohos.promptAction';
export default {
  data: {
    list:[],
    fresh:false
  },
  onInit() {
    this.list = [];
    for (var i = 0; i <= 3; i++) {
            var item ='List element' + i;
      this.list.push(item);
    }
  },
  refresh: function (e) {
    promptAction.showToast({
      message: 'Refreshing...'
    })
    var that = this;
    that.fresh = e.refreshing;
    setTimeout(function () {
      that.fresh = false;
      var addItem ='Refresh element';
      that.list.unshift(addItem);
      promptAction.showToast({
        message: 'Refreshed.'
      })
    }, 2000)
  }
}
```

![en-us_image_0000001150719520](figures/en-us_image_0000001150719520.gif)