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* chore(main): release 15.4.0 * chore: generate versioned docs Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>
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1.3 KiB
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| ExecutionContext.queryObjects |
ExecutionContext.queryObjects() method
This method iterates the JavaScript heap and finds all the objects with the given prototype.
Signature:
class ExecutionContext {
queryObjects<Prototype>(
prototypeHandle: JSHandle<Prototype>
): Promise<HandleFor<Prototype[]>>;
}
Parameters
| Parameter | Type | Description |
|---|---|---|
| prototypeHandle | JSHandle<Prototype> | a handle to the object prototype |
Returns:
Promise<HandleFor<Prototype[]>>
A handle to an array of objects with the given prototype.
Remarks
Example
// 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();