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https://github.com/puppeteer/puppeteer
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50 lines
5.6 KiB
Markdown
50 lines
5.6 KiB
Markdown
---
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sidebar_label: JSHandle
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---
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# JSHandle class
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Represents an in-page JavaScript object. JSHandles can be created with the [page.evaluateHandle](./puppeteer.page.evaluatehandle.md) method.
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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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JSHandle prevents the referenced JavaScript object from being garbage-collected unless the handle is [disposed](./puppeteer.jshandle.dispose.md). JSHandles are auto- disposed when their origin frame gets navigated or the parent context gets destroyed.
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JSHandle instances can be used as arguments for [Page.$eval()](./puppeteer.page._eval.md), [Page.evaluate()](./puppeteer.page.evaluate.md), and [Page.evaluateHandle()](./puppeteer.page.evaluatehandle.md).
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## Properties
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| Property | Modifiers | Type | Description |
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| --------------------------------------------------------------------- | --------- | ---- | -------------------------------------------------------------------------------- |
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| [\[\_\_JSHandleSymbol\]?](./puppeteer.jshandle.___jshandlesymbol_.md) | | T | <i>(Optional)</i> 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) | | |
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| [dispose()](./puppeteer.jshandle.dispose.md) | | Stops referencing the element handle, and resolves when the object handle is successfully disposed of. |
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| [evaluate(pageFunction, args)](./puppeteer.jshandle.evaluate.md) | | This method passes this handle as the first argument to <code>pageFunction</code>. If <code>pageFunction</code> returns a Promise, then <code>handle.evaluate</code> would wait for the promise to resolve and return its value. |
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| [evaluateHandle(pageFunction, args)](./puppeteer.jshandle.evaluatehandle.md) | | This method passes this handle as the first argument to <code>pageFunction</code>. |
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| [executionContext()](./puppeteer.jshandle.executioncontext.md) | | Returns the execution context the handle belongs to. |
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| [getProperties()](./puppeteer.jshandle.getproperties.md) | | The method returns a map with property names as keys and JSHandle instances for the property values. |
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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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| [jsonValue()](./puppeteer.jshandle.jsonvalue.md) | | |
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| [remoteObject()](./puppeteer.jshandle.remoteobject.md) | | Provides access to \[Protocol.Runtime.RemoteObject\](https://chromedevtools.github.io/devtools-protocol/tot/Runtime/\#type-RemoteObject) backing this JSHandle. |
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| [toString()](./puppeteer.jshandle.tostring.md) | | Returns a string representation of the JSHandle. |
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