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scrape.js
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scrape.js
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const puppeteer = require('puppeteer');
const db = require('./db/db_connection.js');
const express = require('express');
const app = express();
(async () => {
const insert_diseases_data = `
INSERT INTO diseases
(name, symptomsOccurrence, geneticEffects)
VALUES
(?, ?, ?);
`;
const insert_symptoms_data = `
INSERT INTO disease_symptom_xref
(disease, symptom, frequency)
VALUES
(?, ?, ?);
`;
const browser = await puppeteer.launch();
const page = await browser.newPage();
const baseURL = 'https://rarediseases.info.nih.gov/diseases?category=Birth%20Defects%3BBlood%20Diseases%3BCancer%3BEndocrine%20Diseases%3BGastrointestinal%20Diseases%3BGenetic%20Diseases%3BInfectious%20Diseases%3BKidney%20Diseases%3BNeurological%20Diseases%3BRespiratory%20Diseases%3BSkin%20Diseases%3BUrinary%20and%20Reproductive%20Diseases&page=';
let currentPage = 72;
let hasNextPage = true;
while (hasNextPage) {
const currentUrl = `${baseURL}${currentPage}&letter=&search=`;
console.log(`Navigating to page ${currentPage}: ${currentUrl}`);
await page.goto(currentUrl);
const diseaseLinks = await page.evaluate(() => {
const links = [];
const diseaseElements = document.querySelectorAll('body > app-root > ng-component > div.container-fluid.pt-3.mb-0.gray-bg > div > div > div > div > div.col-md-7.col-lg-8.col-xl-9 > div.results.pt-md-2 > div > div > a');
diseaseElements.forEach(element => {
links.push(element.href);
});
return links;
});
const currentDiseaseUrl = diseaseLinks[0];
try {
await page.goto(currentDiseaseUrl, { timeout: 10000 });
await Promise.all([
page.waitForNavigation({ waitUntil: 'domcontentloaded' }),
page.waitForSelector('body > app-root > app-disease-about > main-banner > div > div.position-relative.all.banner-image-cover.header-section > div > div.container-xxxl.banner-content.align-items-center.pt-lg-5.mt-lg-4 > div > div > div > h1', { timeout: 2000 })
.catch(() => null),
page.waitForSelector('#age-at-onset > div > div.container-xxxl.pt-5.pt-md-5.mb-md-5 > div > div.col-xl-8 > div > div.lower-text.mt-5.d-flex.justify-content-center.fs-md-18', { timeout: 2000 })
.catch(() => null),
page.waitForSelector('body > app-root > app-disease-about > inheritance > div > div > div > causes-tabs > div.d-flex.d-lg-none.flex-column.mobile-tabs-container.pt-2 > div > ul > li > button', { timeout: 2000 })
.catch(() => null),
page.waitForSelector('#symptoms > div:nth-child(1) > div > div.row.pb-4.pb-xl-5 > div.col.col-xl-9 > div > div.carousel-main', { timeout: 2000 })
.catch(() => null),
page.waitForSelector('div:nth-child(1) > div > div.row.pb-4.pb-xl-5 > div.col.col-xl-9 > div > div.list-item-wrapper.row.mt-2.w-100.mx-0.px-0 > div:nth-child(1) > div.col-3.fw-bold.fs-22.text-maroon.py-4.ps-4', { timeout: 2000 })
.catch(() => null),
]);
await page.waitForSelector('#symptoms > div:nth-child(1) > div > div.row.pb-4.pb-xl-5 > div.col.col-xl-9 > div > div.list-item-wrapper.row.mt-2.w-100.mx-0.px-0 > div', { timeout: 2000 }).catch(() => null);
const selector1 = 'body > app-root > app-disease-about > main-banner > div > div.position-relative.all.banner-image-cover.header-section > div > div.container-xxxl.banner-content.align-items-center.pt-lg-5.mt-lg-4 > div > div > div > h1';
const name = await page.evaluate((selector1) => {
const nameElem = document.querySelector(selector1);
return nameElem ? nameElem.textContent.trim() : 'N/A';
}, selector1);
console.log(name);
const selector = '#age-at-onset > div > div.container-xxxl.pt-5.pt-md-5.mb-md-5 > div > div.col-xl-8 > div > div.lower-text.mt-5.d-flex.justify-content-center.fs-md-18';
const symptomsOccurrence = await page.evaluate((selector) => {
const symptomElement = document.querySelector(selector);
return symptomElement ? symptomElement.textContent.trim() : null;
}, selector);
console.log(symptomsOccurrence)
const geneticEffects = await page.evaluate(() => {
const geneticEffectElements = document.querySelectorAll('body > app-root > app-disease-about > inheritance > div > div > div > causes-tabs > div.d-flex.d-lg-none.flex-column.mobile-tabs-container.pt-2 > div > ul > li > button');
const effects = [];
geneticEffectElements.forEach(element => {
effects.push(element.textContent.trim());
});
return effects;
});
console.log(geneticEffects);
const geneticEffectsString = geneticEffects.length > 0 ? geneticEffects.join(', ') : 'None';
const carouselContainerSelector = '#symptoms > div:nth-child(1) > div > div.row.pb-4.pb-xl-5 > div.col.col-xl-9 > div > div.carousel-main > div.carousel-container.pt-3';
const slideSelector = `${carouselContainerSelector} > div.carousel-slide`;
const nextButtonSelector = '#symptoms > div:nth-child(1) > div > div.row.pb-4.pb-xl-5 > div.col.col-xl-9 > div > div.carousel-main > div.d-xl-none.mobile-prev-next-buttons > button.icon-gard-arrow-right.btn.btn-outline-white.nav-button';
const extractCarouselData = async () => {
const symptomCountSelector = '#symptoms > div:nth-child(1) > div > div.row.pt-0.pb-2.text-white > div > p';
const symptomCountText = await page.evaluate((selector) => {
const element = document.querySelector(selector);
return element ? element.textContent.trim() : '';
}, symptomCountSelector);
const symptomCount = parseInt(symptomCountText.match(/\d+/)[0], 10);
const symptomCountToFetch = symptomCount; // You can change this number as needed
const extractedData = [];
for (let i = 0; i < symptomCountToFetch; i++) {
await page.waitForSelector(carouselContainerSelector);
const symptomData = await page.evaluate((slideSelector) => {
const slides = document.querySelectorAll(slideSelector);
const extractedData = [];
slides.forEach(slide => {
const name = slide.querySelector('.symptom-list-header h3').textContent.trim();
const frequency = slide.querySelector('.symptom-list-frequency.fs-7.fs-md-6 > symptoms-section-frequency-slider > div.wrap > div.frequency-wrap > div.marker-text.d-none.d-md-block > div').textContent.trim();
extractedData.push({ name, frequency });
});
return extractedData;
}, slideSelector);
extractedData.push(...symptomData);
const nextButton = await page.$(nextButtonSelector);
if (!nextButton) {
break;
}
await nextButton.click();
await page.waitForTimeout(1000);
}
return extractedData;
};
const carouselData = await extractCarouselData();
console.log(carouselData);
db.execute(insert_diseases_data, [name, symptomsOccurrence, geneticEffectsString], (error, results) => {
if (error) {
console.log(error);
} else {
console.log("Disease data inserted successfully");
}
});
for (let j = 0; j < carouselData.length; j++) {
const symptom = carouselData[j];
db.execute(insert_symptoms_data, [name, symptom.name, symptom.frequency], (error, results) => {
if (error) {
console.log(error);
} else {
console.log("Symptom data inserted successfully");
}
});
}
} catch (error) {
console.error(`Error processing ${currentDiseaseUrl}: ${error.message}`);
currentPage+=20
continue;
}
const s = '#body > app-root > ng-component > div.container-fluid.pt-3.mb-0.gray-bg > div > div > div > div > div.col-md-7.col-lg-8.col-xl-9 > div.d-flex.d-xl-block.justify-content-between.align-items-center.pb-5 > div > a:nth-child(9)';
const nextButton = await page.evaluate((s) => {
const elem = document.querySelector(s);
return elem ? elem.textContent.trim() : 'N/A';
}, s);
hasNextPage = nextButton !== null;
if (hasNextPage && currentPage < 380) {
currentPage+=20;
} else {
console.log("No more pages");
break;
}
}
await browser.close();
})();
app.listen(4000, () => {
console.log('Server is running on port 4000');
});