feat(Page): introduce Page.queryObjects #1005
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This patch introduces Page.queryObjects and ExecutionContext.queryObjects methods to query JavaScript heap for objects with a certain prototype. Fixes puppeteer#304.
| await page.evaluate(() => window.map = new Map()); | ||
| const prototypeHandle = await page.evaluateHandle(() => Map.prototype); | ||
| const objectsHandle = await page.queryObjects(prototypeHandle); | ||
| const count = await page.evaluate(objects => objects.length, objectsHandle); |
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To make me feel safer, can we actually check that the object here is the map and is usable.
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This is really exciting. It feels a bit clumsy to use, but maybe that is ok. I was hoping for something like |
Disposing an array of JSHandles is not very nice and talkative from protocol's point of view: await Promise.all(handles.map(handle => handle.dispose()));Most of the time you'll be satisfied with inspecting the objects with const objectPrototype = await page.evaluateHandle(() => Object.prototype);
const objectsHandle = await page.queryObjects(objectPrototype);
const count = await page.evaluate(objects => objects.length, objectsHandle); |
ithinkihaveacat
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Oct 31, 2017
This patch introduces `Page.queryObjects` and `ExecutionContext.queryObjects` methods to query JavaScript heap for objects with a certain prototype. Fixes puppeteer#304.
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This patch introduces
Page.queryObjectsandExecutionContext.queryObjectsmethods to query JavaScript heapfor objects with a certain prototype.
Fixes #304.