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- How to set an input field to be read-only in html?
- Use the readonly property to make the input box read-only, the user can view, select but cannot edit the content, and the value is still submitted with the form; the read-only state can be dynamically controlled through JavaScript; unlike disabled, the readonly field can still be focused and the data will be submitted, which is suitable for scenarios where data transmission needs to be retained.
- HTML Tutorial . Web Front-end 978 2025-09-12 00:37:02
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- How to get the row count for all tables in a MySQL database?
- Use INFORMATION_SCHEMA to quickly obtain the estimated row count of each table in the MySQL database, which is suitable for MyISAM and InnoDB; and the exact row count can be obtained through COUNT(*) query, but the speed is slow, which is suitable for scenarios with high accuracy requirements.
- Mysql Tutorial . Database 706 2025-09-12 00:10:01
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- How to horizontally center an image in CSS?
- Tocenteranimagehorizontally,useautomarginsonablock-levelimage:setdisplay:blockandmargin-left/righttoauto.2.Forinlineimages,applytext-align:centertotheparentcontainer.3.Formodernlayouts,usedisplay:flexwithjustify-content:centerontheparent.Eachmethodsu
- CSS Tutorial . Web Front-end 370 2025-09-12 00:08:01
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- Solve the problem that the Submit button cannot display data correctly in JavaScript
- This article aims to solve the problem that the Submit button in JavaScript cannot display data correctly. By wrapping relevant elements in a tag and using the submit event listener, page refresh can be effectively avoided and data can be displayed correctly in the specified location. This article will provide detailed code examples and steps to help developers solve similar problems.
- HTML Tutorial . Web Front-end 332 2025-09-12 00:00:02
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- Calculate the distance between geographic point sequences using Haversine formula in JavaScript
- This tutorial details how to use the Haversine formula to calculate the distance between consecutive points in a geolocation point array in JavaScript. By iterating the array, comparing the latitude and longitude of adjacent points, achieving accurate kilometer-level distance measurement, and providing complete code examples and precautions.
- HTML Tutorial . Web Front-end 589 2025-09-11 23:57:01
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- Tips to resolve the type conversion error of 'Undefined Index' in PHP
- This article aims to help developers resolve "Undefined Index" errors encountered in PHP, especially when getting data from URL parameters and passing them to functions. With a practical case, we will explore how to avoid such problems with explicit type conversions and emphasize the importance of using type declarations in function parameters.
- PHP Tutorial . Backend Development 903 2025-09-11 23:54:01
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- Tutorial on realizing the automatic disappearance of HTML messages
- This tutorial is intended to help developers realize the function of automatically disappearing after displaying messages on a web page. By combining PHP to add specific class names on the server side, using JavaScript to listen to DOM loading completion events on the client side, and setting a timer, the automatic disappearance effect of the message is finally achieved. This article will provide detailed code examples and step instructions to help you easily master this practical technique.
- PHP Tutorial . Backend Development 772 2025-09-11 23:42:01
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- Use window.scrollY to accurately control HTML element styles and boundaries
- This article details how to use JavaScript's window.scrollY property to dynamically adjust HTML elements, such as font size and margins, as pages scroll. By setting clear upper and lower limits of style values, ensure that the visual effect smoothly transitions within the predetermined range and avoid unlimited style changes, thereby improving user experience and interface control.
- HTML Tutorial . Web Front-end 416 2025-09-11 23:39:01
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- Spring Boot Thymeleaf: Solve 404 errors in database deletion operation
- This article aims to help developers solve 404 errors encountered when using Spring Boot and Thymeleaf for database deletion operations. By analyzing controllers, HTML code, and error information, we provide step-by-step troubleshooting and problem-solving solutions to ensure successful data deletion and correct page redirection. This article will focus on URL mapping, parameter passing and redirection methods, and provide corresponding code examples and precautions.
- HTML Tutorial . Web Front-end 505 2025-09-11 23:33:00
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- MySQL Data Filtering and State Echo Practical Guide Based on Checkboxes
- This tutorial details how to use HTML check boxes to interact with PHP and MySQL databases. We will explore two core application scenarios: one is to dynamically filter and display database data according to the checkbox conditions selected by the user; the other is how to correctly display the selected status of the checkbox based on the Boolean value (1 or 0) stored in the database. Through specific code examples and practical guidance, help developers to efficiently implement checkbox-based data management functions.
- PHP Tutorial . Backend Development 514 2025-09-11 23:30:01
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- JavaScript: Listen to window resize event dynamically adjust element width
- This article aims to solve the problem of how to listen for a resize event using JavaScript when the window size is smaller than a specific value and dynamically adjust the width of the target element based on the width of another element. The article will explain in detail how to correctly use window.innerWidth to get the window width and provide complete code examples to help developers achieve responsive layout effects.
- HTML Tutorial . Web Front-end 314 2025-09-11 23:27:00
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- Implement unique identification of cross-browser devices based on browser fingerprint recognition technology
- This article aims to provide a method for realizing unique identification of cross-browser devices through browser fingerprint recognition technology in HTML5 Web applications. Since traditional Session, Cookie and other solutions cannot share data between different browsers, this article will explore in-depth how to use user agents, request headers, Canvas fingerprints, WebGL information, device performance and other features to build a high-probability device fingerprint, thereby establishing associations between different browsers of the same device, and providing corresponding precautions and potential privacy risks.
- PHP Tutorial . Backend Development 228 2025-09-11 23:18:01
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- Solution to prevent repeated clicks in the same game cell causing content to disappear
- This article provides a solution based on CSS class name switching in a simple board game where players repeatedly click on the same cell and cause content (such as "X") to disappear. By adding and removing specific CSS classes, you can control the display and hiding of content in the cell, thereby avoiding the problems caused by repeated clicks, and providing clear code examples and detailed implementation steps.
- HTML Tutorial . Web Front-end 244 2025-09-11 23:12:01
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- Method for solving the type declaration error of 'Undefined Index' in PHP
- This article aims to help developers resolve the "Undefined Index" error encountered in PHP development, which usually occurs when trying to access keys that do not exist in an array. With a practical case, we will explore how to leverage type declarations to avoid such errors and provide some best practice suggestions to improve the robustness and maintainability of our code. The core is to ensure that the type of function parameters is consistent with the type expected by the internal processing logic of the function.
- PHP Tutorial . Backend Development 332 2025-09-11 23:00:01
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