Introduction to Chromeless

Chromeless is a powerful tool that enables developers to automate browser actions using a headless Chrome browser. It is perfect for scenarios such as web scraping, testing, and various other tasks where browser automation is required without a graphical user interface.

Chromeless API Examples

1. Launching a Browser

The primary step in using Chromeless is to launch a headless browser instance. Here is a simple code snippet to launch the browser:

  const Chromeless = require('chromeless');
  
  const chromeless = new Chromeless();
  
  (async function() {
    await chromeless
      .goto('https://example.com')
      .end();
  })();

2. Navigating to a URL

Navigate to a specific URL using the goto method:

  await chromeless.goto('https://example.com');

3. Taking a Screenshot

Take a screenshot of the web page:

  const screenshot = await chromeless.screenshot();
  console.log(screenshot); // prints local file path

4. Extracting Text

Extract text from a specific selector:

  const text = await chromeless.evaluate(() => {
    return document.querySelector('h1').textContent;
  });
  console.log(text);

5. Clicking an Element

Click an element on the page:

  await chromeless.click('#buttonId');

6. Type Text into an Input

Type text into an input field:

  await chromeless.type('Hello World', 'input[name="q"]');

7. Scrolling

Scroll to an element:

  await chromeless.scrollTo(0, 500);

App Example Using Chromeless

Below is an example application that uses several Chromeless APIs to automate form submission and takes a screenshot after submission:

  const Chromeless = require('chromeless');

  const chromeless = new Chromeless();

  (async function() {
    await chromeless
      .goto('https://example-form.com')
      .type('John Doe', 'input[name="name"]')
      .type('john.doe@example.com', 'input[name="email"]')
      .click('#submit')
      .wait('#success')
      .screenshot()
      .then(screenshot => {
        console.log(screenshot); // prints local file path of screenshot
      })
      .end();
  })();

This simple app navigates to a form, fills in the required details, submits it, waits for a success message, and then takes a screenshot of the result.

By leveraging Chromeless, developers can run complex browser automation tasks efficiently and effectively, making it a valuable tool in any developer’s toolkit.

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