mirror of
https://github.com/puppeteer/puppeteer
synced 2024-06-14 14:02:48 +00:00
50 lines
4.7 KiB
Markdown
50 lines
4.7 KiB
Markdown
---
|
|
sidebar_label: JSHandle
|
|
---
|
|
|
|
# JSHandle class
|
|
|
|
Represents a reference to a JavaScript object. Instances can be created using [Page.evaluateHandle()](./puppeteer.page.evaluatehandle.md).
|
|
|
|
Handles prevent the referenced JavaScript object from being garbage-collected unless the handle is purposely [disposed](./puppeteer.jshandle.dispose.md). JSHandles are auto-disposed when their associated frame is navigated away or the parent context gets destroyed.
|
|
|
|
Handles can be used as arguments for any evaluation function such as [Page.$eval()](./puppeteer.page._eval.md), [Page.evaluate()](./puppeteer.page.evaluate.md), and [Page.evaluateHandle()](./puppeteer.page.evaluatehandle.md). They are resolved to their referenced object.
|
|
|
|
#### Signature:
|
|
|
|
```typescript
|
|
export declare class JSHandle<T = unknown>
|
|
```
|
|
|
|
## Remarks
|
|
|
|
The constructor for this class is marked as internal. Third-party code should not call the constructor directly or create subclasses that extend the `JSHandle` class.
|
|
|
|
## Example
|
|
|
|
```ts
|
|
const windowHandle = await page.evaluateHandle(() => window);
|
|
```
|
|
|
|
## Properties
|
|
|
|
| Property | Modifiers | Type | Description |
|
|
| ---------------------- | --------------------- | ---- | -------------------------------------------------------------- |
|
|
| \[\_\_JSHandleSymbol\] | <code>optional</code> | T | Used for nominally typing [JSHandle](./puppeteer.jshandle.md). |
|
|
|
|
## Methods
|
|
|
|
| Method | Modifiers | Description |
|
|
| ---------------------------------------------------------------------------- | --------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------- |
|
|
| [asElement()](./puppeteer.jshandle.aselement.md) | | Either <code>null</code> or the handle itself if the handle is an instance of [ElementHandle](./puppeteer.elementhandle.md). |
|
|
| [dispose()](./puppeteer.jshandle.dispose.md) | | Releases the object referenced by the handle for garbage collection. |
|
|
| [evaluate(pageFunction, args)](./puppeteer.jshandle.evaluate.md) | | Evaluates the given function with the current handle as its first argument. |
|
|
| [evaluateHandle(pageFunction, args)](./puppeteer.jshandle.evaluatehandle.md) | | Evaluates the given function with the current handle as its first argument. |
|
|
| [getProperties()](./puppeteer.jshandle.getproperties.md) | | Gets a map of handles representing the properties of the current handle. |
|
|
| [getProperty(propertyName)](./puppeteer.jshandle.getproperty.md) | | Fetches a single property from the referenced object. |
|
|
| [getProperty(propertyName)](./puppeteer.jshandle.getproperty_1.md) | | |
|
|
| [getProperty(propertyName)](./puppeteer.jshandle.getproperty_2.md) | | |
|
|
| [jsonValue()](./puppeteer.jshandle.jsonvalue.md) | | A vanilla object representing the serializable portions of the referenced object. |
|
|
| [remoteObject()](./puppeteer.jshandle.remoteobject.md) | | Provides access to the [Protocol.Runtime.RemoteObject](https://chromedevtools.github.io/devtools-protocol/tot/Runtime/#type-RemoteObject) backing this handle. |
|
|
| [toString()](./puppeteer.jshandle.tostring.md) | | Returns a string representation of the JSHandle. |
|