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Author: g | 2025-04-24

The querySelectorAll() method returns all elements that matches a CSS selector(s). The querySelectorAll() method returns a NodeList . The querySelectorAll() method throws a The querySelectorAll() method returns all elements that matches a CSS selector(s). The querySelectorAll() method returns a NodeList. The querySelectorAll() method throws a

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Const csvRows = []; // Loop through each row for (const row of rows) { const cols = row.querySelectorAll('td, th'); const csvRow = []; // Loop through each column for (const col of cols) { csvRow.push('"' + col.innerText.replace(/"/g, '""') + '"'); // Escape double quotes } csvRows.push(csvRow.join(',')); // Join columns to create a CSV row } // Create a CSV string const csvString = csvRows.join('\n'); // Creating a link to download the CSV file const link = document.createElement('a'); link.href = 'data:text/csv;charset=utf-8,' + encodeURI(csvString); link.target = '_blank'; link.download = 'table_data.csv'; document.body.appendChild(link); link.click(); // Initiate download document.body.removeChild(link); // Clean up}// Attach the function to a button click eventdocument.getElementById('downloadButton').addEventListener('click', downloadTableAsCSV);Explanation of the Code Snippet:Getting Table Rows: The code uses document.getElementById to fetch the table by its ID (exampleTable). It collects all rows using the querySelectorAll method.Building CSV Rows: A nested for-loop iterates through each row and column, formatting the text. Notice how we escape double quotes to avoid issues in the CSV format.Creating Download Link: Finally, we create an anchor tag programmatically to facilitate the downloading of the CSV file.Consider Using LibrariesFor more complex cases or larger datasets, consider using libraries like PapaParse for parsing and conversion, which provides extensive functionalities to simplify these operations.To Wrap Things UpWith this guide, you should now feel confident converting HTML tables to CSV using JavaScript. As web technologies continue to evolve, understanding these principles will enhance your data management abilities.For further reading, consider checking out the following resources:MDN Web Docs on Table ElementsJavaScript DataTables DocumentationPapaParse DocumentationNow that you have the tools and knowledge at your disposal, go ahead and convert those HTML tables into CSV files with ease! Happy coding! DOM Workshop ✨Welcome to the DOM workshop! 👋 This workshop will provide hands-on experience working with the Document Object Model (DOM) in JavaScript. The DOM allows us to manipulate HTML and CSS using JavaScript.In this workshop, you will learn:How to select DOM elements using different selectors like getElementById, querySelector, etc. 🎯Traverse the DOM tree using properties like parentNode, childNodes, children, firstChild, andlastChild.How to modify text, HTML attributes, styles of DOM elements 🖌How to add, remove, and replace DOM elements ➕ ➖How to create new DOM elements and add them to the page 👷‍♂️The workshop contains examples and exercises to help you practice DOM manipulation. 💪 By the end of this workshop, you will have the skills to dynamically update web pages using JavaScript like a pro! 😎Getting StartedCreate a index.js file.Properly link index.js in your HTML document. ask Google or Tutorbot, if you need help with this!Check your javascript file is linked correctly by adding code to log a message:If you can't see your messages, double check the following:Your file path is correct.Your script tag is after the body tag of your html document or uses the defer attribute.Make sure to save the file and refresh the page.Ticket 1: Selecting DOM ElementsTicket 1a: getElementById()Instructions:Use getElementById() to select the element with the id of "title".Log the selected element to the console.Expected Outcome:The console should display the element with the content "Intro to the DOM".Ticket 1b: getElementsByClassName()Instructions:Use getElementsByClassName() to select elements with the class of "content".Log the selected elements to the console.Expected Outcome:The console should display a collection of two elements. The first with the content "This is a paragraph with the class 'content'." and the second with "This is another paragraph with the class 'content' and 'highlight'."Ticket 1c: getElementsByTagName()Instructions:Use getElementsByTagName() to select all elements on the page.Log the selected elements to the console.Expected Outcome:The console should display a collection of five elements with the content "🍎 Apple", "🍌 Banana", "🍒 Cherry", "🍇 Date", and "🍈 Fig", respectively.Ticket 1d: querySelector()Instructions:Use querySelector() to select the first element with the class "highlight".Log the selected element to the console.Expected Outcome:The console should display a single element with the content "This is another paragraph with the class 'content' and 'highlight'."Ticket 1e: querySelectorAll()Instructions:Use querySelectorAll() to select all elements with the class "highlight".Log the selected elements to the console.Expected Outcome:The console should display a collection of three elements: a element with the content "This is another paragraph with the class 'content' and 'highlight'" and two elements with the content "🍒 Cherry" and "🍈 Fig".Ticket 2: Traversing the DOMTicket 2a: Parent NodeInstructions:Select the first element inside the with the id of "itemList".Use the parentNode property to access its parent.Log the parent element to the console.Expected Outcome:The console should display

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Parsing web font as HTML causes major loss in performance and eventually crash- capture argument for addEventListener() and removeEventListener() should default to false- Opera does not fire events for empty scripts- Value of JSON.stringify with single digit argument is not equal to equivalent string literal- My Places pop-up in Google Maps cannot be closed, preventing use of Google Map Directions- Clicking on Google+ tab (top left corner) results in page that is never finished loading (history.replaceState)- XMLHttpRequest can not POST data that consists of plain literal numbers only- string.replace with number reference returns a wrong string- querySelectorAll does not throw exception on unknown pseudo-class- inline-block has maximum height of 2^15 (The Google Maps Api Reference)- Printing in Gmail freezes Opera- WebP images loaded through Turbo are not drawn if they are within the visible part of the content at load- Extension will not run on a page without Javascript unless first ran on a page with Javascript# Mail, news, chat* Improvements- Two-lined message list- New message display window- Message layout optimized for wide screens by not using whole width- New overlay dialogs for the mail view settings- Message grouping- Support for Pinning, mapped to IMAP \Flagged- Quick Reply redesign- Ctrl-Enter to send quick reply- Added support for QRESYNC - efficient IMAP sync- You can now change the global/default sorting and threading for mail (but still have a custom sorting for individual views)- Styling of feed items has been updated- Mail database files will be much less fragmented over time- Improved mail database stability with grouped journaling* Fixes- Message displayed even though no message selected- Show image enclosures inline in feeds- Paste with mouse in Mail Compose window is mouse position dependant- Enable Fit to Width for Opera Mail- Show account connection status in mail panel- Unread in Mail panel returns Us to scrape and parse Google Search Results with various Javascript libraries. We also saw how we can use a combination of Unirest and Cheerio and Axios and Cheerio to extract the data from Google.Other LibrariesIn this section, we will discuss some of the alternatives to the above-discussed libraries.Nightmare JSNightmare JS is a web automation library designed for websites that don’t own APIs and want to automate browsing tasks. Nightmare JS is mostly used by developers for UI testing and crawling. It can also help mimic user actions(like goto, type, and click) with an API that feels synchronous for each block of scripting. Let us take an example of how we can use Nightmare JS to scrape the Google Search Twitter Results.Install the Nightmare JS by running this command:npm i nightmareAs you can see in the above image, each Twitter result is under the tag .dHOsHb. So, this makes our code look like this:const Nightmare = require("nightmare") const nightmare = Nightmare() nightmare.goto(" => { let twitter_results = []; const results = document.querySelectorAll(".dHOsHb") results.forEach((result) => { let row = { "tweet": result.innerText, } twitter_results.push(row) }) return twitter_results;}).end().then((result) => { result.forEach((r) => { console.log(r.tweet); })}).catch((error) => { console.log(error)})Step-by-step explanation:After importing the library, we created an instance of Nightmare JS with the name nightmare.Then we use goto() to navigate to our target URL.In the next step, we used wait() to wait for the selected tag of the twitter result. You can also pass a time value as a parameter to wait for a specific period.Then we used evaluate(), which invokes functions on the page, in our case, it is querySelectorAll().In the next step, we used the forEach() function to iterate over the results array and fill each element with the text content.At last, we called the end() to stop the crawler and returned

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In the meantime it’s best to use getAttribute and setAttribute as demonstrated earlier.While developing your application, you may find it useful to be able to select elements based on the presence of — or indeed the specific values of — their custom data- attributes. This can be achieved quickly and easily using querySelectorAll as shown below:// Select all elements with a 'data-flowering' attributedocument.querySelectorAll('[data-flowering]');// Select all elements with red leavesdocument.querySelectorAll('[data-foliage-colour="red"]');A word of warningAs data attributes become more widely used, the potential for clashes in naming conventions becomes much greater. If you use an unimaginative attribute name such as data-height, then it is likely you will eventually come across a library or plugin that uses the same attribute name. Multiple scripts getting and setting a common data- attribute will probably cause chaos. In order to avoid this, I encourage people to choose a standard string (perhaps the site/plugin name) to prefix all their data- attributes — e.g. data-html5doctor-height or data-my-plugin-height.SummaryCustom data- attributes are a great way to simplify the storage of application data in your web pages. Although you can’t utilise the new JavaScript APIs just yet, you can enjoy great success using getAttribute and setAttribute safe in the knowledge that they will work in all major browsers.HomeworkIf you’re super keen to have a play with the new dataset property but disappointed that it hasn’t been implemented, fear not!, for there is a light at the end of the tunnel. You might be interested in looking at Dr Remy’s experimental code, which partially enables the dataset functionality in some browsers by editing the Element.prototype.The code supports the retrieval of data- attributes in the latest versions of Firefox, Safari, Opera, and Chrome, but sadly will not work in any version of IE (since IE does not expose the Element object). This code also. The querySelectorAll() method returns all elements that matches a CSS selector(s). The querySelectorAll() method returns a NodeList . The querySelectorAll() method throws a The querySelectorAll() method returns all elements that matches a CSS selector(s). The querySelectorAll() method returns a NodeList. The querySelectorAll() method throws a

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Hire Me! I'm currently looking for my next role in developer relations and advocacy. If you've got an open role and think I'd be a fit, please reach out. You can also find me on LinkedIn. While driving my kids to school this morning, I had an interesting thought. Is it possible for a web component to recognize, and respond, when its inner DOM contents have changed? Turns out of course it is, and the answer isn't really depenedant on web components, but is a baked-in part of the web platform, the MutationObserver. Here's what I built as a way to test it out.The Initial Web ComponentI began with a simple web component that had the following simple feature - count the number of images inside it and report. So we can start with this HTML: And build a simple component:class ImgCounter extends HTMLElement { constructor() { super(); } connectedCallback() { let imgs = this.querySelectorAll('img'); this.innerHTML += `There are ${imgs.length} images in me.`; } }if(!customElements.get('img-counter')) customElements.define('img-counter', ImgCounter);It just uses querySelectorAll to count the img node inside it. For my initial HTML, this reports 3 of course.I then added a simple button to my HTML:Add ImgAnd a bit of code:document.querySelector('#testAdd').addEventListener('click', () => { document.querySelector('img-counter').innerHTML = 'New: ' + document.querySelector('img-counter').innerHTML;});When run, it will add a new image, but obviously, the counter won't update. Here's a CodePen of this initial version: See the Pen Img Counter WC 1 by Raymond Camden (@cfjedimaster) on CodePen.Enter - the MutationObserverThe MDN docs on MutationObserver are pretty good, as always. I won't repeat what's written there but the basics are:Define what you want to observe under a DOM element - which includes the subtree, childList, and attributesWrite your callbackDefine the observer based on the callbackTie the observer to the DOM root you want to watchSo my thinking was...Move out my 'count images and update display' to a functionAdd a mutation observer and when things change, re-run the new functionMy first attempt was rather naive, but here it is in code form, not CodePen, for reasons that will be clear soon:class ImgCounter extends HTMLElement { constructor() { super(); } connectedCallback() { this.renderCount(); const mutationObserver = (mutationList, observer) => { this.renderCount(); }; const observer = new MutationObserver(mutationObserver); observer.observe(this, { childList: true, subtree: true }); } renderCount() { let imgs = this.querySelectorAll('img'); this.innerHTML += `There are ${imgs.length} images in me.`; }}So the MutationObserver callback is sent information about what changed,