1.3 KiB
1.3 KiB
Home > puppeteer > ExecutionContext > queryObjects
ExecutionContext.queryObjects() method
This method iterates the JavaScript heap and finds all the objects with the given prototype.
Signature:
queryObjects(prototypeHandle: JSHandle): Promise<JSHandle>;
Parameters
| Parameter | Type | Description |
|---|---|---|
| prototypeHandle | JSHandle | a handle to the object prototype |
Returns:
Promise<JSHandle>
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();