mirror of
https://github.com/puppeteer/puppeteer
synced 2024-06-14 14:02:48 +00:00
f07ad2c661
This PR updates the docs regarding configuring puppeteer. In addition, some changes have been made to the documentation generator to show default values on the documentation site. Also fixes: https://github.com/puppeteer/puppeteer/pull/9144
1.3 KiB
1.3 KiB
| sidebar_label |
|---|
| 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.
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();