b33ff31c2a
Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>
45 lines
1.3 KiB
Markdown
45 lines
1.3 KiB
Markdown
---
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sidebar_label: Page.queryObjects
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---
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# Page.queryObjects() method
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This method iterates the JavaScript heap and finds all objects with the given prototype.
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#### Signature:
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```typescript
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class Page {
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abstract queryObjects<Prototype>(
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prototypeHandle: JSHandle<Prototype>
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): Promise<JSHandle<Prototype[]>>;
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}
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```
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## Parameters
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| Parameter | Type | Description |
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| --------------- | ---------------------------------------------------- | --------------------------------- |
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| prototypeHandle | [JSHandle](./puppeteer.jshandle.md)<Prototype> | a handle to the object prototype. |
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**Returns:**
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Promise<[JSHandle](./puppeteer.jshandle.md)<Prototype\[\]>>
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Promise which resolves to a handle to an array of objects with this prototype.
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## Example
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```ts
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// Create a Map object
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await page.evaluate(() => (window.map = new Map()));
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// Get a handle to the Map object prototype
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const mapPrototype = await page.evaluateHandle(() => Map.prototype);
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// Query all map instances into an array
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const mapInstances = await page.queryObjects(mapPrototype);
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// Count amount of map objects in heap
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const count = await page.evaluate(maps => maps.length, mapInstances);
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await mapInstances.dispose();
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await mapPrototype.dispose();
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```
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