45 lines
1.3 KiB
Markdown
45 lines
1.3 KiB
Markdown
---
|
|
sidebar_label: ExecutionContext.queryObjects
|
|
---
|
|
|
|
# ExecutionContext.queryObjects() method
|
|
|
|
Iterates through the JavaScript heap and finds all the objects with the given prototype.
|
|
|
|
**Signature:**
|
|
|
|
```typescript
|
|
class ExecutionContext {
|
|
queryObjects<Prototype>(
|
|
prototypeHandle: JSHandle<Prototype>
|
|
): Promise<HandleFor<Prototype[]>>;
|
|
}
|
|
```
|
|
|
|
## Parameters
|
|
|
|
| Parameter | Type | Description |
|
|
| --------------- | ---------------------------------------------------- | -------------------------------- |
|
|
| prototypeHandle | [JSHandle](./puppeteer.jshandle.md)<Prototype> | a handle to the object prototype |
|
|
|
|
**Returns:**
|
|
|
|
Promise<[HandleFor](./puppeteer.handlefor.md)<Prototype\[\]>>
|
|
|
|
A handle to an array of objects with the given prototype.
|
|
|
|
## Example
|
|
|
|
```ts
|
|
// Create a Map object
|
|
await page.evaluate(() => (window.map = new Map()));
|
|
// Get a handle to the Map object prototype
|
|
const mapPrototype = await page.evaluateHandle(() => Map.prototype);
|
|
// Query all map instances into an array
|
|
const mapInstances = await page.queryObjects(mapPrototype);
|
|
// Count amount of map objects in heap
|
|
const count = await page.evaluate(maps => maps.length, mapInstances);
|
|
await mapInstances.dispose();
|
|
await mapPrototype.dispose();
|
|
```
|