/**
* @license
* Copyright 2018 Google Inc.
* SPDX-License-Identifier: Apache-2.0
*/
import expect from 'expect' ;
import {Puppeteer} from 'puppeteer' ;
import type {CustomQueryHandler} from 'puppeteer-core/internal/common/CustomQueryHandler.js' ;
import {getTestState, setupTestBrowserHooks} from './mocha-utils.js' ;
describe('querySelector' , function () {
setupTestBrowserHooks();
describe('Page.$eval' , function () {
it('should work' , async () => {
const {page} = await getTestState();
await page.setContent('<section id="testAttribute">43543</section>' );
const idAttribute = await page.$eval('section' , e => {
return e.id;
});
expect(idAttribute).toBe('testAttribute' );
});
it('should accept arguments' , async () => {
const {page} = await getTestState();
await page.setContent('<section>hello</section>' );
const text = await page.$eval(
'section' ,
(e, suffix) => {
return e.textContent! + suffix;
},
' world!' ,
);
expect(text).toBe('hello world!' );
});
it('should accept ElementHandles as arguments' , async () => {
const {page} = await getTestState();
await page.setContent('<section>hello</section><div> world</div>' );
using divHandle = (await page.$('div' ))!;
const text = await page.$eval(
'section' ,
(e, div) => {
return e.textContent! + div.textContent!;
},
divHandle,
);
expect(text).toBe('hello world' );
});
it('should throw error if no element is found' , async () => {
const {page} = await getTestState();
let error!: Error;
await page
.$eval('section' , e => {
return e.id;
})
.catch (error_ => {
return (error = error_);
});
expect(error.message).toContain(
'failed to find element matching selector "section"' ,
);
});
});
// The tests for $$eval are repeated later in this file in the test group 'QueryAll'.
// This is done to also test a query handler where QueryAll returns an Element[]
// as opposed to NodeListOf<Element>.
describe('Page.$$eval' , function () {
it('should work' , async () => {
const {page} = await getTestState();
await page.setContent(
'<div>hello</div><div>beautiful</div><div>world!</div>' ,
);
const divsCount = await page.$$eval('div' , divs => {
return divs.length;
});
expect(divsCount).toBe(3 );
});
it('should accept extra arguments' , async () => {
const {page} = await getTestState();
await page.setContent(
'<div>hello</div><div>beautiful</div><div>world!</div>' ,
);
const divsCountPlus5 = await page.$$eval(
'div' ,
(divs, two, three) => {
return divs.length + (two as number) + (three as number);
},
2 ,
3 ,
);
expect(divsCountPlus5).toBe(8 );
});
it('should accept ElementHandles as arguments' , async () => {
const {page} = await getTestState();
await page.setContent(
'<section>2</section><section>2</section><section>1</section><div>3</div>' ,
);
using divHandle = (await page.$('div' ))!;
const sum = await page.$$eval(
'section' ,
(sections, div) => {
return (
sections.reduce((acc, section) => {
return acc + Number(section.textContent);
}, 0 ) + Number(div.textContent)
);
},
divHandle,
);
expect(sum).toBe(8 );
});
it('should handle many elements' , async function () {
this .timeout(25 _000 );
const {page} = await getTestState();
await page.evaluate(
`
for (var i = 0 ; i <= 1000 ; i++) {
const section = document.createElement('section' );
section.textContent = i;
document.body.appendChild(section);
}
`,
);
const sum = await page.$$eval('section' , sections => {
return sections.reduce((acc, section) => {
return acc + Number(section.textContent);
}, 0 );
});
expect(sum).toBe(500500 );
});
});
describe('Page.$' , function () {
it('should query existing element' , async () => {
const {page} = await getTestState();
await page.setContent('<section>test</section>' );
using element = (await page.$('section' ))!;
expect(element).toBeTruthy();
});
it('should return null for non-existing element' , async () => {
const {page} = await getTestState();
using element = (await page.$('non-existing-element' ))!;
expect(element).toBe(null );
});
});
describe('Page.$$' , function () {
it('should query existing elements' , async () => {
const {page} = await getTestState();
await page.setContent('<div>A</div><br/><div>B</div>' );
const elements = await page.$$('div' );
expect(elements).toHaveLength(2 );
const promises = elements.map(element => {
return page.evaluate(e => {
return e.textContent;
}, element);
});
expect(await Promise.all(promises)).toEqual(['A' , 'B' ]);
});
it('should query existing elements without isolation' , async () => {
const {page} = await getTestState();
await page.setContent('<div>A</div><br/><div>B</div>' );
const elements = await page.$$('div' , {
isolate: false ,
});
expect(elements).toHaveLength(2 );
const promises = elements.map(element => {
return page.evaluate(e => {
return e.textContent;
}, element);
});
expect(await Promise.all(promises)).toEqual(['A' , 'B' ]);
});
it('should return empty array if nothing is found' , async () => {
const {page, server} = await getTestState();
await page.goto (server.EMPTY_PAGE);
const elements = await page.$$('div' );
expect(elements).toHaveLength(0 );
});
describe('xpath' , function () {
it('should query existing element' , async () => {
const {page} = await getTestState();
await page.setContent('<section>test</section>' );
const elements = await page.$$('xpath/html/body/section' );
expect(elements[0 ]).toBeTruthy();
expect(elements).toHaveLength(1 );
});
it('should return empty array for non-existing element' , async () => {
const {page} = await getTestState();
const element = await page.$$('xpath/html/body/non-existing-element' );
expect(element).toEqual([]);
});
it('should return multiple elements' , async () => {
const {page} = await getTestState();
await page.setContent('<div></div><div></div>' );
const elements = await page.$$('xpath/html/body/div' );
expect(elements).toHaveLength(2 );
});
});
});
describe('ElementHandle.$' , function () {
it('should query existing element' , async () => {
const {page, server} = await getTestState();
await page.goto (server.PREFIX + '/playground.html' );
await page.setContent(
'<html><body><div class="second"><div class="inner">A</div></div></body></html>' ,
);
using html = (await page.$('html' ))!;
using second = (await html.$('.second' ))!;
using inner = await second.$('.inner' );
const content = await page.evaluate(e => {
return e?.textContent;
}, inner);
expect(content).toBe('A' );
});
it('should return null for non-existing element' , async () => {
const {page} = await getTestState();
await page.setContent(
'<html><body><div class="second"><div class="inner">B</div></div></body></html>' ,
);
using html = (await page.$('html' ))!;
using second = await html.$('.third' );
expect(second).toBe(null );
});
});
describe('ElementHandle.$eval' , function () {
it('should work' , async () => {
const {page} = await getTestState();
await page.setContent(
'<html><body><div class="tweet"><div class="like">100</div><div class="retweets">10</div></div></body></html>' ,
);
using tweet = (await page.$('.tweet' ))!;
const content = await tweet.$eval('.like' , node => {
return (node as HTMLElement).innerText;
});
expect(content).toBe('100' );
});
it('should retrieve content from subtree' , async () => {
const {page} = await getTestState();
const htmlContent =
'<div class="a">not-a-child-div</div><div id="myId"><div class="a">a-child-div</div></div>' ;
await page.setContent(htmlContent);
using elementHandle = (await page.$('#myId' ))!;
const content = await elementHandle.$eval('.a' , node => {
return (node as HTMLElement).innerText;
});
expect(content).toBe('a-child-div' );
});
it('should throw in case of missing selector' , async () => {
const {page} = await getTestState();
const htmlContent =
'<div class="a">not-a-child-div</div><div id="myId"></div>' ;
await page.setContent(htmlContent);
using elementHandle = (await page.$('#myId' ))!;
const errorMessage = await elementHandle
.$eval('.a' , node => {
return (node as HTMLElement).innerText;
})
.catch (error => {
return error.message;
});
expect(errorMessage).toBe(
`Error: failed to find element matching selector ".a" `,
);
});
});
describe('ElementHandle.$$eval' , function () {
it('should work' , async () => {
const {page} = await getTestState();
await page.setContent(
'<html><body><div class="tweet"><div class="like">100</div><div class="like">10</div></div></body></html>' ,
);
using tweet = (await page.$('.tweet' ))!;
const content = await tweet.$$eval('.like' , nodes => {
return (nodes as HTMLElement[]).map(n => {
return n.innerText;
});
});
expect(content).toEqual(['100' , '10' ]);
});
it('should retrieve content from subtree' , async () => {
const {page} = await getTestState();
const htmlContent =
'<div class="a">not-a-child-div</div><div id="myId"><div class="a">a1-child-div</div><div class="a">a2-child-div</div></div>' ;
await page.setContent(htmlContent);
using elementHandle = (await page.$('#myId' ))!;
const content = await elementHandle.$$eval('.a' , nodes => {
return (nodes as HTMLElement[]).map(n => {
return n.innerText;
});
});
expect(content).toEqual(['a1-child-div' , 'a2-child-div' ]);
});
it('should not throw in case of missing selector' , async () => {
const {page} = await getTestState();
const htmlContent =
'<div class="a">not-a-child-div</div><div id="myId"></div>' ;
await page.setContent(htmlContent);
using elementHandle = (await page.$('#myId' ))!;
const nodesLength = await elementHandle.$$eval('.a' , nodes => {
return nodes.length;
});
expect(nodesLength).toBe(0 );
});
});
describe('ElementHandle.$$' , function () {
it('should query existing elements' , async () => {
const {page} = await getTestState();
await page.setContent(
'<html><body><div>A</div><br/><div>B</div></body></html>' ,
);
using html = (await page.$('html' ))!;
const elements = await html.$$('div' );
expect(elements).toHaveLength(2 );
const promises = elements.map(element => {
return page.evaluate(e => {
return e.textContent;
}, element);
});
expect(await Promise.all(promises)).toEqual(['A' , 'B' ]);
});
it('should return empty array for non-existing elements' , async () => {
const {page} = await getTestState();
await page.setContent(
'<html><body><span>A</span><br/><span>B</span></body></html>' ,
);
using html = (await page.$('html' ))!;
const elements = await html.$$('div' );
expect(elements).toHaveLength(0 );
});
describe('xpath' , function () {
it('should query existing element' , async () => {
const {page, server} = await getTestState();
await page.goto (server.PREFIX + '/playground.html' );
await page.setContent(
'<html><body><div class="second"><div class="inner">A</div></div></body></html>' ,
);
using html = (await page.$('html' ))!;
const second = await html.$$(
`xpath/./body/div[contains(@class , 'second' )]`,
);
const inner = await second[0 ]!.$$(
`xpath/./div[contains(@class , 'inner' )]`,
);
const content = await page.evaluate(e => {
return e.textContent;
}, inner[0 ]!);
expect(content).toBe('A' );
});
it('should return null for non-existing element' , async () => {
const {page} = await getTestState();
await page.setContent(
'<html><body><div class="second"><div class="inner">B</div></div></body></html>' ,
);
using html = (await page.$('html' ))!;
const second = await html.$$(`xpath/div[contains(@class , 'third' )]`);
expect(second).toEqual([]);
});
});
});
// This is the same tests for `$$eval` and `$$` as above, but with a queryAll
// handler that returns an array instead of a list of nodes.
describe('QueryAll' , function () {
const handler: CustomQueryHandler = {
queryAll: (element, selector) => {
return [...(element as Element).querySelectorAll(selector)];
},
};
before(() => {
Puppeteer.registerCustomQueryHandler('allArray' , handler);
});
it('should have registered handler' , async () => {
expect(
Puppeteer.customQueryHandlerNames().includes('allArray' ),
).toBeTruthy();
});
it('$$ should query existing elements' , async () => {
const {page} = await getTestState();
await page.setContent(
'<html><body><div>A</div><br/><div>B</div></body></html>' ,
);
using html = (await page.$('html' ))!;
const elements = await html.$$('allArray/div' );
expect(elements).toHaveLength(2 );
const promises = elements.map(element => {
return page.evaluate(e => {
return e.textContent;
}, element);
});
expect(await Promise.all(promises)).toEqual(['A' , 'B' ]);
});
it('$$ should return empty array for non-existing elements' , async () => {
const {page} = await getTestState();
await page.setContent(
'<html><body><span>A</span><br/><span>B</span></body></html>' ,
);
using html = (await page.$('html' ))!;
const elements = await html.$$('allArray/div' );
expect(elements).toHaveLength(0 );
});
it('$$eval should work' , async () => {
const {page} = await getTestState();
await page.setContent(
'<div>hello</div><div>beautiful</div><div>world!</div>' ,
);
const divsCount = await page.$$eval('allArray/div' , divs => {
return divs.length;
});
expect(divsCount).toBe(3 );
});
it('$$eval should accept extra arguments' , async () => {
const {page} = await getTestState();
await page.setContent(
'<div>hello</div><div>beautiful</div><div>world!</div>' ,
);
const divsCountPlus5 = await page.$$eval(
'allArray/div' ,
(divs, two, three) => {
return divs.length + (two as number) + (three as number);
},
2 ,
3 ,
);
expect(divsCountPlus5).toBe(8 );
});
it('$$eval should accept ElementHandles as arguments' , async () => {
const {page} = await getTestState();
await page.setContent(
'<section>2</section><section>2</section><section>1</section><div>3</div>' ,
);
using divHandle = (await page.$('div' ))!;
const sum = await page.$$eval(
'allArray/section' ,
(sections, div) => {
return (
sections.reduce((acc, section) => {
return acc + Number(section.textContent);
}, 0 ) + Number(div.textContent)
);
},
divHandle,
);
expect(sum).toBe(8 );
});
it('$$eval should handle many elements' , async function () {
this .timeout(25 _000 );
const {page} = await getTestState();
await page.evaluate(
`
for (var i = 0 ; i <= 1000 ; i++) {
const section = document.createElement('section' );
section.textContent = i;
document.body.appendChild(section);
}
`,
);
const sum = await page.$$eval('allArray/section' , sections => {
return sections.reduce((acc, section) => {
return acc + Number(section.textContent);
}, 0 );
});
expect(sum).toBe(500500 );
});
});
});
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