puppeteer/website/versioned_docs/version-10.0.0/puppeteer.executioncontext.queryobjects.md
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Co-authored-by: Jack Franklin <jacktfranklin@chromium.org>
2021-08-09 09:57:14 +01:00

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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();