1.3 KiB
1.3 KiB
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| Page.queryObjects |
Page.queryObjects() method
This method iterates the JavaScript heap and finds all objects with the given prototype.
Signature:
class Page {queryObjects<Prototype>(prototypeHandle: JSHandle<Prototype>): Promise<JSHandle<Prototype[]>>;}
Parameters
| Parameter | Type | Description |
|---|---|---|
| prototypeHandle | JSHandle<Prototype> | a handle to the object prototype. |
Returns:
Promise<JSHandle<Prototype[]>>
Promise which resolves to a handle to an array of objects with this prototype.
Remarks
Shortcut for page.mainFrame().executionContext().queryObjects(prototypeHandle).
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();