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Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com> Co-authored-by: Nikolay Vitkov <nvitkov@chromium.org>
68 lines
1.2 KiB
Markdown
68 lines
1.2 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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<table><thead><tr><th>
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Parameter
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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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prototypeHandle
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</td><td>
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[JSHandle](./puppeteer.jshandle.md)<Prototype>
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</td><td>
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a handle to the object prototype.
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</td></tr>
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</tbody></table>
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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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