44 lines
2.7 KiB
Markdown
44 lines
2.7 KiB
Markdown
<!-- Do not edit this file. It is automatically generated by API Documenter. -->
|
|
|
|
[Home](./index.md) > [puppeteer](./puppeteer.md) > [JSHandle](./puppeteer.jshandle.md)
|
|
|
|
## JSHandle class
|
|
|
|
Represents an in-page JavaScript object. JSHandles can be created with the [page.evaluateHandle](./puppeteer.page.evaluatehandle.md) method.
|
|
|
|
<b>Signature:</b>
|
|
|
|
```typescript
|
|
export declare class JSHandle
|
|
```
|
|
|
|
## 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
|
|
|
|
|
|
```js
|
|
const windowHandle = await page.evaluateHandle(() => window);
|
|
|
|
```
|
|
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.
|
|
|
|
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)<!-- -->.
|
|
|
|
## Methods
|
|
|
|
| Method | Modifiers | Description |
|
|
| --- | --- | --- |
|
|
| [asElement()](./puppeteer.jshandle.aselement.md) | | Returns either <code>null</code> or the object handle itself, if the object handle is an instance of [ElementHandle](./puppeteer.elementhandle.md)<!-- -->. |
|
|
| [dispose()](./puppeteer.jshandle.dispose.md) | | Stops referencing the element handle, and resolves when the object handle is successfully disposed of. |
|
|
| [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. |
|
|
| [evaluateHandle(pageFunction, args)](./puppeteer.jshandle.evaluatehandle.md) | | This method passes this handle as the first argument to <code>pageFunction</code>. |
|
|
| [executionContext()](./puppeteer.jshandle.executioncontext.md) | | Returns the execution context the handle belongs to. |
|
|
| [getProperties()](./puppeteer.jshandle.getproperties.md) | | The method returns a map with property names as keys and JSHandle instances for the property values. |
|
|
| [getProperty(propertyName)](./puppeteer.jshandle.getproperty.md) | | Fetches a single property from the referenced object. |
|
|
| [jsonValue()](./puppeteer.jshandle.jsonvalue.md) | | Returns a JSON representation of the object. |
|
|
| [toString()](./puppeteer.jshandle.tostring.md) | | Returns a string representation of the JSHandle. |
|
|
|