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50 lines
4.7 KiB
Markdown
50 lines
4.7 KiB
Markdown
---
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sidebar_label: JSHandle
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---
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# JSHandle class
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Represents a reference to a JavaScript object. Instances can be created using [Page.evaluateHandle()](./puppeteer.page.evaluatehandle.md).
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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.
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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.
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#### Signature:
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```typescript
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export declare class JSHandle<T = unknown>
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```
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## Remarks
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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.
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## Example
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```ts
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const windowHandle = await page.evaluateHandle(() => window);
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```
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## Properties
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| Property | Modifiers | Type | Description |
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| ---------------------- | --------------------- | ---- | -------------------------------------------------------------- |
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| \[\_\_JSHandleSymbol\] | <code>optional</code> | T | Used for nominally typing [JSHandle](./puppeteer.jshandle.md). |
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## Methods
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| Method | Modifiers | Description |
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| ---------------------------------------------------------------------------- | --------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------- |
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| [asElement()](./puppeteer.jshandle.aselement.md) | | Either <code>null</code> or the handle itself if the handle is an instance of [ElementHandle](./puppeteer.elementhandle.md). |
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| [dispose()](./puppeteer.jshandle.dispose.md) | | Releases the object referenced by the handle for garbage collection. |
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| [evaluate(pageFunction, args)](./puppeteer.jshandle.evaluate.md) | | Evaluates the given function with the current handle as its first argument. |
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| [evaluateHandle(pageFunction, args)](./puppeteer.jshandle.evaluatehandle.md) | | Evaluates the given function with the current handle as its first argument. |
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| [getProperties()](./puppeteer.jshandle.getproperties.md) | | Gets a map of handles representing the properties of the current handle. |
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| [getProperty(propertyName)](./puppeteer.jshandle.getproperty.md) | | Fetches a single property from the referenced object. |
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| [getProperty(propertyName)](./puppeteer.jshandle.getproperty_1.md) | | |
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| [getProperty(propertyName)](./puppeteer.jshandle.getproperty_2.md) | | |
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| [jsonValue()](./puppeteer.jshandle.jsonvalue.md) | | A vanilla object representing the serializable portions of the referenced object. |
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| [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. |
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| [toString()](./puppeteer.jshandle.tostring.md) | | Returns a string representation of the JSHandle. |
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