IT Log

Record various IT issues and difficulties.

Tag: JavaScript

  • How to Write JavaScript Countdown

    To create a JavaScript countdown timer, follow these steps: HTML Structure: Create a container for the countdown display. <div class="countdown-container"> <div id="days">00</div> <div id="hours">00</div> <div id="minutes">00</div> <div id="seconds">00</div> </div> CSS Styling: Style the container and countdown elements. .countdown-container { display: flex; justify-content: center; align-items: center; gap: 2rem; font-family: Arial, sans-serif; color: #333; } #days, #hours,…

  • Front-end uses Markdown to upload files, the editor generates a timestamp, and how does the backend receive it

    To solve the problem of generating a timestamp when uploading files using Markdown in the frontend and receiving it in the backend, follow these steps: Frontend Implementation: Generate Timestamp: Use JavaScript’s Date.now() to create a unique timestamp. Modify Filename: Append the timestamp to the selected file’s name (e.g., filename_1630548000.jpg). Insert into Markdown: Update the Markdown…

  • Front-End Drag and Drop Sorting Implementation Methods

    Front-End Drag and Drop Sorting Implementation Methods To implement drag-and-drop sorting in the frontend, you can use HTML5’s drag-and-drop API along with JavaScript. Here’s a step-by-step guide to achieve this: 1. Set Up HTML Structure Create a container for your sortable items. For example: <div class="sortable-container"> <div class="item" draggable="true">Item 1</div> <div class="item" draggable="true">Item 2</div> <div…

  • Merge Multiple HTTP Requests in Frontend

    To merge multiple HTTP requests in the frontend, you can use JavaScript libraries like axios or superagent, which support batching of requests. Alternatively, you can utilize ES6 Promises with Promise.all() to handle multiple requests concurrently. Solution Code: // Example using Promise.all() with Fetch API const mergeRequests = () => { const requests = [ fetch(‘https://api.example.com/data1’),…

  • How to Transfer Backend Data to Frontend

    To transfer backend data to the frontend effectively, follow these steps: Establish Communication: Use HTTP methods (GET, POST) to send requests from the frontend to the backend. Implement endpoints in your backend to handle these requests. Fetch Data with JavaScript: Utilize libraries like Axios or the Fetch API in your frontend code to make these…

  • How to Convert String Type to Long Type

    To convert a string type to a long type, follow these steps depending on the programming language you’re using: Java Use Long.parseLong() method: try { String str = "12345"; long num = Long.parseLong(str); System.out.println(num); // Output: 12345 } catch (NumberFormatException e) { e.printStackTrace(); } Python Use the int() function, as long is deprecated in Python…