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https://github.com/puppeteer/puppeteer
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204 lines
3.6 KiB
Markdown
204 lines
3.6 KiB
Markdown
---
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sidebar_label: JSHandle
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---
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# JSHandle class
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Represents 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 abstract 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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<table><thead><tr><th>
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Property
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</th><th>
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Modifiers
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</th><th>
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Type
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</th><th>
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Description
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</th></tr></thead>
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<tbody><tr><td>
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<span id="_">\_</span>
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</td><td>
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`optional`
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</td><td>
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T
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</td><td>
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Used for nominally typing [JSHandle](./puppeteer.jshandle.md).
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</td></tr>
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<tr><td>
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<span id="move">move</span>
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</td><td>
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</td><td>
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() => this
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</td><td>
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</td></tr>
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</tbody></table>
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## Methods
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<table><thead><tr><th>
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Method
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</th><th>
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Modifiers
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</th><th>
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Description
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</th></tr></thead>
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<tbody><tr><td>
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<span id="aselement">[asElement()](./puppeteer.jshandle.aselement.md)</span>
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</td><td>
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</td><td>
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Either `null` or the handle itself if the handle is an instance of [ElementHandle](./puppeteer.elementhandle.md).
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</td></tr>
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<tr><td>
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<span id="dispose">[dispose()](./puppeteer.jshandle.dispose.md)</span>
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</td><td>
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</td><td>
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Releases the object referenced by the handle for garbage collection.
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</td></tr>
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<tr><td>
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<span id="evaluate">[evaluate(pageFunction, args)](./puppeteer.jshandle.evaluate.md)</span>
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</td><td>
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</td><td>
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Evaluates the given function with the current handle as its first argument.
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</td></tr>
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<tr><td>
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<span id="evaluatehandle">[evaluateHandle(pageFunction, args)](./puppeteer.jshandle.evaluatehandle.md)</span>
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</td><td>
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</td><td>
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Evaluates the given function with the current handle as its first argument.
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</td></tr>
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<tr><td>
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<span id="getproperties">[getProperties()](./puppeteer.jshandle.getproperties.md)</span>
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</td><td>
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</td><td>
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Gets a map of handles representing the properties of the current handle.
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</td></tr>
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<tr><td>
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<span id="getproperty">[getProperty(propertyName)](./puppeteer.jshandle.getproperty.md)</span>
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</td><td>
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</td><td>
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Fetches a single property from the referenced object.
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</td></tr>
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<tr><td>
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<span id="getproperty">[getProperty(propertyName)](./puppeteer.jshandle.getproperty_1.md)</span>
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</td><td>
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</td><td>
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</td></tr>
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<tr><td>
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<span id="jsonvalue">[jsonValue()](./puppeteer.jshandle.jsonvalue.md)</span>
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</td><td>
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</td><td>
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A vanilla object representing the serializable portions of the referenced object.
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</td></tr>
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<tr><td>
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<span id="remoteobject">[remoteObject()](./puppeteer.jshandle.remoteobject.md)</span>
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</td><td>
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</td><td>
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Provides access to the [Protocol.Runtime.RemoteObject](https://chromedevtools.github.io/devtools-protocol/tot/Runtime/#type-RemoteObject) backing this handle.
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</td></tr>
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<tr><td>
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<span id="tostring">[toString()](./puppeteer.jshandle.tostring.md)</span>
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</td><td>
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</td><td>
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Returns a string representation of the JSHandle.
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</td></tr>
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</tbody></table>
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