Add new file

getInnerHTML.js

+
+const axios = require('axios');
+const domParser = require('dom-parser');
+const xpath = require('xpath');
+
+var cache = {};
+async function crawler(url, id, cb) {
+	cache[url] = cache[url] ? cache[url] : await axios.get(url)
+			.catch(function (e) {
+				console.error("Err near the axios.get", e);
+			});
+	return cb(cache[url].data, id);
+}
+
+function getInnerHTML_example_using_dom_parser(x, id) {
+	let r = null;
+	try {
+		let dp = new domParser({errorHandler: (e) => {
+				clog(e);
+			}});
+		let xmldoc = dp.parseFromString(x, 'text/html');
+		let el = xmldoc.getElementById(id);
+		r = el.innerHTML;
+	} catch (e) {
+		console.error(e);
+	}
+	return JSON.stringify(r);
+}
+
+function getInnerHTML(x, id) {
+	let resultAsString = null;
+	// Please write your code here
+	// Please don't use any standard or nonstandard DOMParser
+	return resultAsString;
+}
+
+(async () => {
+	let url = "https://www.amazon.com/dp/B01I5X5SQE"
+	let id = 'SalesRank';
+	let r1 = await crawler(url, id, getInnerHTML_example_using_dom_parser);
+	let r2 = await crawler(url, id, getInnerHTML_example_using_dom_parser);
+	console.log('Does the "getInnerHTML_example_using_dom_parser" function work correctly?', r1 === r2);
+	let r3 = await crawler(url, id, getInnerHTML);
+	console.log('Does the "getInnerHTML" function work correctly?', r3 === r2);
+})()
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