Next, we need a JavaScript file to handle the signature drawing logic. The code is as follows: <\/p>
const canvas = document.getElementById('signatureCanvas');\nconst context = canvas.getContext('2d');\nlet isDrawing = false;\nlet lastX = 0;\nlet lastY = 0;\n\ncanvas.addEventListener('mousedown', (e) => {\n isDrawing = true;\n [lastX, lastY] = [e.clientX - canvas.offsetLeft, e.clientY - canvas.offsetTop];\n});\n\ncanvas.addEventListener('mousemove', (e) => {\n if (!isDrawing) return;\n const x = e.clientX - canvas.offsetLeft;\n const y = e.clientY - canvas.offsetTop;\n context.beginPath();\n context.moveTo(lastX, lastY);\n context.lineTo(x, y);\n context.stroke();\n [lastX, lastY] = [x, y];\n});\n\ncanvas.addEventListener('mouseup', () => {\n isDrawing = false;\n});\n\nfunction clearSignature() {\n context.clearRect(0, 0, canvas.width, canvas.height);\n}\n\nfunction saveSignature() {\n const image = document.getElementById('savedSignature');\n image.src = canvas.toDataURL();\n}<\/pre>In the above code, we first obtain the canvas element and its context object. We then listened to the mouse events to get the user's signature draw position. In the mouse down event, we will start recording the coordinates of the user's last point. In the mouse move event, we draw the signature graphic based on the recorded coordinates and the current coordinates. On the mouse release event, we stop recording the user's signature drawing. Finally, we provide functions to clear the signature and save the signature. The latter assigns the DataURL generated by the signature to an image element to display the signature. <\/p>Finally, we need to introduce external CSS files to beautify the page. You can customize the style according to your own needs. The sample code is as follows: <\/p>canvas {\n border: 1px solid #000;\n cursor: crosshair;\n}\n\nbutton {\n margin-top: 10px;\n}<\/pre>Through the above steps, we successfully built a simple online electronic signature tool. Users can draw their own signature on the canvas, clear the signature through the Clear button, and save the signature as a picture through the Save button. Developers can expand functions according to business needs, such as adding signature verification, saving signatures to back-end servers, etc. <\/p>\nSummary: Using JavaScript to build online electronic signature tools can provide convenience and security for modern business communications. Through the code examples provided in this article, developers can quickly implement a powerful online electronic signature tool and expand it according to business needs. <\/p>\nThe above is an article about using JavaScript to build an online electronic signature tool. I hope it will be helpful to readers. <\/p>"} 亚洲国产日韩欧美一区二区三区,精品亚洲国产成人av在线,国产99视频精品免视看7,99国产精品久久久久久久成人热,欧美日韩亚洲国产综合乱 Community Articles Topics Q&A Learn Course Programming Dictionary Tools Library Development tools Website Source Code PHP Libraries JS special effects Website Materials Extension plug-ins AI Tools Leisure Game Download Game Tutorials English 簡(jiǎn)體中文 English 繁體中文 日本語(yǔ) ??? Melayu Fran?ais Deutsch Login singup Home Web Front-end JS Tutorial Build an online e-signature tool using JavaScript Build an online e-signature tool using JavaScript WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWB Aug 09, 2023 pm 12:01 PM javascript online electronic signature Using JavaScript to build an online electronic signature tool With the advent of the digital age, electronic signatures have become a fast, convenient and secure way of business communication. When developing online electronic signature tools, JavaScript is undoubtedly a powerful language choice. This article will introduce how to use JavaScript to build a simple yet powerful online electronic signature tool, with code examples. Before we start, we need to understand a few concepts. There are generally two types of electronic signatures: picture-based signatures and vector graphic-based signatures. The former displays the user's real signature image on the web page, while the latter uses JavaScript to draw the signature graphic. In this article, we will use a vector graphic-based signature. First, we need an HTML page as a basis. On the page we will place a canvas element for the user to draw their signature. The code is as follows: <!DOCTYPE html> <html> <head> <title>在線電子簽名工具</title> <script src="signature.js"></script> </head> <body> <h1>在線電子簽名工具</h1> <canvas id="signatureCanvas"></canvas> <button onclick="clearSignature()">清除簽名</button> <button onclick="saveSignature()">保存簽名</button> <img id="savedSignature" / alt="Build an online e-signature tool using JavaScript" > </body> </html>Next, we need a JavaScript file to handle the signature drawing logic. The code is as follows: const canvas = document.getElementById('signatureCanvas'); const context = canvas.getContext('2d'); let isDrawing = false; let lastX = 0; let lastY = 0; canvas.addEventListener('mousedown', (e) => { isDrawing = true; [lastX, lastY] = [e.clientX - canvas.offsetLeft, e.clientY - canvas.offsetTop]; }); canvas.addEventListener('mousemove', (e) => { if (!isDrawing) return; const x = e.clientX - canvas.offsetLeft; const y = e.clientY - canvas.offsetTop; context.beginPath(); context.moveTo(lastX, lastY); context.lineTo(x, y); context.stroke(); [lastX, lastY] = [x, y]; }); canvas.addEventListener('mouseup', () => { isDrawing = false; }); function clearSignature() { context.clearRect(0, 0, canvas.width, canvas.height); } function saveSignature() { const image = document.getElementById('savedSignature'); image.src = canvas.toDataURL(); }In the above code, we first obtain the canvas element and its context object. We then listened to the mouse events to get the user's signature draw position. In the mouse down event, we will start recording the coordinates of the user's last point. In the mouse move event, we draw the signature graphic based on the recorded coordinates and the current coordinates. On the mouse release event, we stop recording the user's signature drawing. Finally, we provide functions to clear the signature and save the signature. The latter assigns the DataURL generated by the signature to an image element to display the signature. Finally, we need to introduce external CSS files to beautify the page. You can customize the style according to your own needs. The sample code is as follows: canvas { border: 1px solid #000; cursor: crosshair; } button { margin-top: 10px; }Through the above steps, we successfully built a simple online electronic signature tool. Users can draw their own signature on the canvas, clear the signature through the Clear button, and save the signature as a picture through the Save button. Developers can expand functions according to business needs, such as adding signature verification, saving signatures to back-end servers, etc. Summary: Using JavaScript to build online electronic signature tools can provide convenience and security for modern business communications. Through the code examples provided in this article, developers can quickly implement a powerful online electronic signature tool and expand it according to business needs. The above is an article about using JavaScript to build an online electronic signature tool. I hope it will be helpful to readers. The above is the detailed content of Build an online e-signature tool using JavaScript. For more information, please follow other related articles on the PHP Chinese website! Statement of this Website The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn Hot AI Tools Undress AI Tool Undress images for free Undresser.AI Undress AI-powered app for creating realistic nude photos AI Clothes Remover Online AI tool for removing clothes from photos. Clothoff.io AI clothes remover Video Face Swap Swap faces in any video effortlessly with our completely free AI face swap tool! Show More Hot Article Grass Wonder Build Guide | Uma Musume Pretty Derby 4 weeks ago By Jack chen Roblox: 99 Nights In The Forest - All Badges And How To Unlock Them 3 weeks ago By DDD Uma Musume Pretty Derby Banner Schedule (July 2025) 4 weeks ago By Jack chen Windows Security is blank or not showing options 4 weeks ago By 下次還敢 RimWorld Odyssey Temperature Guide for Ships and Gravtech 3 weeks ago By Jack chen Show More Hot Tools Notepad++7.3.1 Easy-to-use and free code editor SublimeText3 Chinese version Chinese version, very easy to use Zend Studio 13.0.1 Powerful PHP integrated development environment Dreamweaver CS6 Visual web development tools SublimeText3 Mac version God-level code editing software (SublimeText3) Show More Hot Topics Laravel Tutorial 1597 29 PHP Tutorial 1488 72 Show More Related knowledge WebSocket and JavaScript: key technologies for implementing real-time monitoring systems Dec 17, 2023 pm 05:30 PM WebSocket and JavaScript: Key technologies for realizing real-time monitoring systems Introduction: With the rapid development of Internet technology, real-time monitoring systems have been widely used in various fields. One of the key technologies to achieve real-time monitoring is the combination of WebSocket and JavaScript. This article will introduce the application of WebSocket and JavaScript in real-time monitoring systems, give code examples, and explain their implementation principles in detail. 1. WebSocket technology How to implement an online speech recognition system using WebSocket and JavaScript Dec 17, 2023 pm 02:54 PM How to use WebSocket and JavaScript to implement an online speech recognition system Introduction: With the continuous development of technology, speech recognition technology has become an important part of the field of artificial intelligence. The online speech recognition system based on WebSocket and JavaScript has the characteristics of low latency, real-time and cross-platform, and has become a widely used solution. This article will introduce how to use WebSocket and JavaScript to implement an online speech recognition system. How to use JavaScript and WebSocket to implement a real-time online ordering system Dec 17, 2023 pm 12:09 PM Introduction to how to use JavaScript and WebSocket to implement a real-time online ordering system: With the popularity of the Internet and the advancement of technology, more and more restaurants have begun to provide online ordering services. In order to implement a real-time online ordering system, we can use JavaScript and WebSocket technology. WebSocket is a full-duplex communication protocol based on the TCP protocol, which can realize real-time two-way communication between the client and the server. In the real-time online ordering system, when the user selects dishes and places an order JavaScript and WebSocket: Building an efficient real-time weather forecasting system Dec 17, 2023 pm 05:13 PM JavaScript and WebSocket: Building an efficient real-time weather forecast system Introduction: Today, the accuracy of weather forecasts is of great significance to daily life and decision-making. As technology develops, we can provide more accurate and reliable weather forecasts by obtaining weather data in real time. In this article, we will learn how to use JavaScript and WebSocket technology to build an efficient real-time weather forecast system. This article will demonstrate the implementation process through specific code examples. We How to implement an online reservation system using WebSocket and JavaScript Dec 17, 2023 am 09:39 AM How to use WebSocket and JavaScript to implement an online reservation system. In today's digital era, more and more businesses and services need to provide online reservation functions. It is crucial to implement an efficient and real-time online reservation system. This article will introduce how to use WebSocket and JavaScript to implement an online reservation system, and provide specific code examples. 1. What is WebSocket? WebSocket is a full-duplex method on a single TCP connection. Simple JavaScript Tutorial: How to Get HTTP Status Code Jan 05, 2024 pm 06:08 PM JavaScript tutorial: How to get HTTP status code, specific code examples are required. Preface: In web development, data interaction with the server is often involved. When communicating with the server, we often need to obtain the returned HTTP status code to determine whether the operation is successful, and perform corresponding processing based on different status codes. This article will teach you how to use JavaScript to obtain HTTP status codes and provide some practical code examples. Using XMLHttpRequest How to use Java Websocket to implement online audio and video calls? Dec 02, 2023 am 09:44 AM How to use JavaWebsocket to implement online audio and video calls? In today's digital age, real-time communication is becoming more and more common. Whether it is remote collaboration at work or remote communication with relatives and friends at home, real-time audio and video calls have become an indispensable part of people. This article will introduce how to use JavaWebsocket to implement online audio and video calls, and provide specific code examples. 1. Understand WebsocketWebsocket is a new technology in HTML5 How to use insertBefore in javascript Nov 24, 2023 am 11:56 AM Usage: In JavaScript, the insertBefore() method is used to insert a new node in the DOM tree. This method requires two parameters: the new node to be inserted and the reference node (that is, the node where the new node will be inserted). See all articles <bdo id="golye"></bdo><abbr id="golye"><optgroup id="golye"></optgroup></abbr><var id="golye"></var>
In the above code, we first obtain the canvas element and its context object. We then listened to the mouse events to get the user's signature draw position. In the mouse down event, we will start recording the coordinates of the user's last point. In the mouse move event, we draw the signature graphic based on the recorded coordinates and the current coordinates. On the mouse release event, we stop recording the user's signature drawing. Finally, we provide functions to clear the signature and save the signature. The latter assigns the DataURL generated by the signature to an image element to display the signature. <\/p>
Finally, we need to introduce external CSS files to beautify the page. You can customize the style according to your own needs. The sample code is as follows: <\/p>
canvas {\n border: 1px solid #000;\n cursor: crosshair;\n}\n\nbutton {\n margin-top: 10px;\n}<\/pre>Through the above steps, we successfully built a simple online electronic signature tool. Users can draw their own signature on the canvas, clear the signature through the Clear button, and save the signature as a picture through the Save button. Developers can expand functions according to business needs, such as adding signature verification, saving signatures to back-end servers, etc. <\/p>\nSummary: Using JavaScript to build online electronic signature tools can provide convenience and security for modern business communications. Through the code examples provided in this article, developers can quickly implement a powerful online electronic signature tool and expand it according to business needs. <\/p>\nThe above is an article about using JavaScript to build an online electronic signature tool. I hope it will be helpful to readers. <\/p>"} 亚洲国产日韩欧美一区二区三区,精品亚洲国产成人av在线,国产99视频精品免视看7,99国产精品久久久久久久成人热,欧美日韩亚洲国产综合乱 Community Articles Topics Q&A Learn Course Programming Dictionary Tools Library Development tools Website Source Code PHP Libraries JS special effects Website Materials Extension plug-ins AI Tools Leisure Game Download Game Tutorials English 簡(jiǎn)體中文 English 繁體中文 日本語(yǔ) ??? Melayu Fran?ais Deutsch Login singup Home Web Front-end JS Tutorial Build an online e-signature tool using JavaScript Build an online e-signature tool using JavaScript WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWB Aug 09, 2023 pm 12:01 PM javascript online electronic signature Using JavaScript to build an online electronic signature tool With the advent of the digital age, electronic signatures have become a fast, convenient and secure way of business communication. When developing online electronic signature tools, JavaScript is undoubtedly a powerful language choice. This article will introduce how to use JavaScript to build a simple yet powerful online electronic signature tool, with code examples. Before we start, we need to understand a few concepts. There are generally two types of electronic signatures: picture-based signatures and vector graphic-based signatures. The former displays the user's real signature image on the web page, while the latter uses JavaScript to draw the signature graphic. In this article, we will use a vector graphic-based signature. First, we need an HTML page as a basis. On the page we will place a canvas element for the user to draw their signature. The code is as follows: <!DOCTYPE html> <html> <head> <title>在線電子簽名工具</title> <script src="signature.js"></script> </head> <body> <h1>在線電子簽名工具</h1> <canvas id="signatureCanvas"></canvas> <button onclick="clearSignature()">清除簽名</button> <button onclick="saveSignature()">保存簽名</button> <img id="savedSignature" / alt="Build an online e-signature tool using JavaScript" > </body> </html>Next, we need a JavaScript file to handle the signature drawing logic. The code is as follows: const canvas = document.getElementById('signatureCanvas'); const context = canvas.getContext('2d'); let isDrawing = false; let lastX = 0; let lastY = 0; canvas.addEventListener('mousedown', (e) => { isDrawing = true; [lastX, lastY] = [e.clientX - canvas.offsetLeft, e.clientY - canvas.offsetTop]; }); canvas.addEventListener('mousemove', (e) => { if (!isDrawing) return; const x = e.clientX - canvas.offsetLeft; const y = e.clientY - canvas.offsetTop; context.beginPath(); context.moveTo(lastX, lastY); context.lineTo(x, y); context.stroke(); [lastX, lastY] = [x, y]; }); canvas.addEventListener('mouseup', () => { isDrawing = false; }); function clearSignature() { context.clearRect(0, 0, canvas.width, canvas.height); } function saveSignature() { const image = document.getElementById('savedSignature'); image.src = canvas.toDataURL(); }In the above code, we first obtain the canvas element and its context object. We then listened to the mouse events to get the user's signature draw position. In the mouse down event, we will start recording the coordinates of the user's last point. In the mouse move event, we draw the signature graphic based on the recorded coordinates and the current coordinates. On the mouse release event, we stop recording the user's signature drawing. Finally, we provide functions to clear the signature and save the signature. The latter assigns the DataURL generated by the signature to an image element to display the signature. Finally, we need to introduce external CSS files to beautify the page. You can customize the style according to your own needs. The sample code is as follows: canvas { border: 1px solid #000; cursor: crosshair; } button { margin-top: 10px; }Through the above steps, we successfully built a simple online electronic signature tool. Users can draw their own signature on the canvas, clear the signature through the Clear button, and save the signature as a picture through the Save button. Developers can expand functions according to business needs, such as adding signature verification, saving signatures to back-end servers, etc. Summary: Using JavaScript to build online electronic signature tools can provide convenience and security for modern business communications. Through the code examples provided in this article, developers can quickly implement a powerful online electronic signature tool and expand it according to business needs. The above is an article about using JavaScript to build an online electronic signature tool. I hope it will be helpful to readers. The above is the detailed content of Build an online e-signature tool using JavaScript. For more information, please follow other related articles on the PHP Chinese website! Statement of this Website The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn Hot AI Tools Undress AI Tool Undress images for free Undresser.AI Undress AI-powered app for creating realistic nude photos AI Clothes Remover Online AI tool for removing clothes from photos. Clothoff.io AI clothes remover Video Face Swap Swap faces in any video effortlessly with our completely free AI face swap tool! Show More Hot Article Grass Wonder Build Guide | Uma Musume Pretty Derby 4 weeks ago By Jack chen Roblox: 99 Nights In The Forest - All Badges And How To Unlock Them 3 weeks ago By DDD Uma Musume Pretty Derby Banner Schedule (July 2025) 4 weeks ago By Jack chen Windows Security is blank or not showing options 4 weeks ago By 下次還敢 RimWorld Odyssey Temperature Guide for Ships and Gravtech 3 weeks ago By Jack chen Show More Hot Tools Notepad++7.3.1 Easy-to-use and free code editor SublimeText3 Chinese version Chinese version, very easy to use Zend Studio 13.0.1 Powerful PHP integrated development environment Dreamweaver CS6 Visual web development tools SublimeText3 Mac version God-level code editing software (SublimeText3) Show More Hot Topics Laravel Tutorial 1597 29 PHP Tutorial 1488 72 Show More Related knowledge WebSocket and JavaScript: key technologies for implementing real-time monitoring systems Dec 17, 2023 pm 05:30 PM WebSocket and JavaScript: Key technologies for realizing real-time monitoring systems Introduction: With the rapid development of Internet technology, real-time monitoring systems have been widely used in various fields. One of the key technologies to achieve real-time monitoring is the combination of WebSocket and JavaScript. This article will introduce the application of WebSocket and JavaScript in real-time monitoring systems, give code examples, and explain their implementation principles in detail. 1. WebSocket technology How to implement an online speech recognition system using WebSocket and JavaScript Dec 17, 2023 pm 02:54 PM How to use WebSocket and JavaScript to implement an online speech recognition system Introduction: With the continuous development of technology, speech recognition technology has become an important part of the field of artificial intelligence. The online speech recognition system based on WebSocket and JavaScript has the characteristics of low latency, real-time and cross-platform, and has become a widely used solution. This article will introduce how to use WebSocket and JavaScript to implement an online speech recognition system. How to use JavaScript and WebSocket to implement a real-time online ordering system Dec 17, 2023 pm 12:09 PM Introduction to how to use JavaScript and WebSocket to implement a real-time online ordering system: With the popularity of the Internet and the advancement of technology, more and more restaurants have begun to provide online ordering services. In order to implement a real-time online ordering system, we can use JavaScript and WebSocket technology. WebSocket is a full-duplex communication protocol based on the TCP protocol, which can realize real-time two-way communication between the client and the server. In the real-time online ordering system, when the user selects dishes and places an order JavaScript and WebSocket: Building an efficient real-time weather forecasting system Dec 17, 2023 pm 05:13 PM JavaScript and WebSocket: Building an efficient real-time weather forecast system Introduction: Today, the accuracy of weather forecasts is of great significance to daily life and decision-making. As technology develops, we can provide more accurate and reliable weather forecasts by obtaining weather data in real time. In this article, we will learn how to use JavaScript and WebSocket technology to build an efficient real-time weather forecast system. This article will demonstrate the implementation process through specific code examples. We How to implement an online reservation system using WebSocket and JavaScript Dec 17, 2023 am 09:39 AM How to use WebSocket and JavaScript to implement an online reservation system. In today's digital era, more and more businesses and services need to provide online reservation functions. It is crucial to implement an efficient and real-time online reservation system. This article will introduce how to use WebSocket and JavaScript to implement an online reservation system, and provide specific code examples. 1. What is WebSocket? WebSocket is a full-duplex method on a single TCP connection. Simple JavaScript Tutorial: How to Get HTTP Status Code Jan 05, 2024 pm 06:08 PM JavaScript tutorial: How to get HTTP status code, specific code examples are required. Preface: In web development, data interaction with the server is often involved. When communicating with the server, we often need to obtain the returned HTTP status code to determine whether the operation is successful, and perform corresponding processing based on different status codes. This article will teach you how to use JavaScript to obtain HTTP status codes and provide some practical code examples. Using XMLHttpRequest How to use Java Websocket to implement online audio and video calls? Dec 02, 2023 am 09:44 AM How to use JavaWebsocket to implement online audio and video calls? In today's digital age, real-time communication is becoming more and more common. Whether it is remote collaboration at work or remote communication with relatives and friends at home, real-time audio and video calls have become an indispensable part of people. This article will introduce how to use JavaWebsocket to implement online audio and video calls, and provide specific code examples. 1. Understand WebsocketWebsocket is a new technology in HTML5 How to use insertBefore in javascript Nov 24, 2023 am 11:56 AM Usage: In JavaScript, the insertBefore() method is used to insert a new node in the DOM tree. This method requires two parameters: the new node to be inserted and the reference node (that is, the node where the new node will be inserted). See all articles <bdo id="golye"></bdo><abbr id="golye"><optgroup id="golye"></optgroup></abbr><var id="golye"></var>
Through the above steps, we successfully built a simple online electronic signature tool. Users can draw their own signature on the canvas, clear the signature through the Clear button, and save the signature as a picture through the Save button. Developers can expand functions according to business needs, such as adding signature verification, saving signatures to back-end servers, etc. <\/p>\n
Summary: Using JavaScript to build online electronic signature tools can provide convenience and security for modern business communications. Through the code examples provided in this article, developers can quickly implement a powerful online electronic signature tool and expand it according to business needs. <\/p>\n
The above is an article about using JavaScript to build an online electronic signature tool. I hope it will be helpful to readers. <\/p>"}
Using JavaScript to build an online electronic signature tool
With the advent of the digital age, electronic signatures have become a fast, convenient and secure way of business communication. When developing online electronic signature tools, JavaScript is undoubtedly a powerful language choice. This article will introduce how to use JavaScript to build a simple yet powerful online electronic signature tool, with code examples.
Before we start, we need to understand a few concepts. There are generally two types of electronic signatures: picture-based signatures and vector graphic-based signatures. The former displays the user's real signature image on the web page, while the latter uses JavaScript to draw the signature graphic. In this article, we will use a vector graphic-based signature.
First, we need an HTML page as a basis. On the page we will place a canvas element for the user to draw their signature. The code is as follows:
<!DOCTYPE html> <html> <head> <title>在線電子簽名工具</title> <script src="signature.js"></script> </head> <body> <h1>在線電子簽名工具</h1> <canvas id="signatureCanvas"></canvas> <button onclick="clearSignature()">清除簽名</button> <button onclick="saveSignature()">保存簽名</button> <img id="savedSignature" / alt="Build an online e-signature tool using JavaScript" > </body> </html>
Next, we need a JavaScript file to handle the signature drawing logic. The code is as follows:
const canvas = document.getElementById('signatureCanvas'); const context = canvas.getContext('2d'); let isDrawing = false; let lastX = 0; let lastY = 0; canvas.addEventListener('mousedown', (e) => { isDrawing = true; [lastX, lastY] = [e.clientX - canvas.offsetLeft, e.clientY - canvas.offsetTop]; }); canvas.addEventListener('mousemove', (e) => { if (!isDrawing) return; const x = e.clientX - canvas.offsetLeft; const y = e.clientY - canvas.offsetTop; context.beginPath(); context.moveTo(lastX, lastY); context.lineTo(x, y); context.stroke(); [lastX, lastY] = [x, y]; }); canvas.addEventListener('mouseup', () => { isDrawing = false; }); function clearSignature() { context.clearRect(0, 0, canvas.width, canvas.height); } function saveSignature() { const image = document.getElementById('savedSignature'); image.src = canvas.toDataURL(); }
In the above code, we first obtain the canvas element and its context object. We then listened to the mouse events to get the user's signature draw position. In the mouse down event, we will start recording the coordinates of the user's last point. In the mouse move event, we draw the signature graphic based on the recorded coordinates and the current coordinates. On the mouse release event, we stop recording the user's signature drawing. Finally, we provide functions to clear the signature and save the signature. The latter assigns the DataURL generated by the signature to an image element to display the signature.
Finally, we need to introduce external CSS files to beautify the page. You can customize the style according to your own needs. The sample code is as follows:
canvas { border: 1px solid #000; cursor: crosshair; } button { margin-top: 10px; }
Through the above steps, we successfully built a simple online electronic signature tool. Users can draw their own signature on the canvas, clear the signature through the Clear button, and save the signature as a picture through the Save button. Developers can expand functions according to business needs, such as adding signature verification, saving signatures to back-end servers, etc.
Summary: Using JavaScript to build online electronic signature tools can provide convenience and security for modern business communications. Through the code examples provided in this article, developers can quickly implement a powerful online electronic signature tool and expand it according to business needs.
The above is an article about using JavaScript to build an online electronic signature tool. I hope it will be helpful to readers.
The above is the detailed content of Build an online e-signature tool using JavaScript. For more information, please follow other related articles on the PHP Chinese website!
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Easy-to-use and free code editor
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WebSocket and JavaScript: Key technologies for realizing real-time monitoring systems Introduction: With the rapid development of Internet technology, real-time monitoring systems have been widely used in various fields. One of the key technologies to achieve real-time monitoring is the combination of WebSocket and JavaScript. This article will introduce the application of WebSocket and JavaScript in real-time monitoring systems, give code examples, and explain their implementation principles in detail. 1. WebSocket technology
How to use WebSocket and JavaScript to implement an online speech recognition system Introduction: With the continuous development of technology, speech recognition technology has become an important part of the field of artificial intelligence. The online speech recognition system based on WebSocket and JavaScript has the characteristics of low latency, real-time and cross-platform, and has become a widely used solution. This article will introduce how to use WebSocket and JavaScript to implement an online speech recognition system.
Introduction to how to use JavaScript and WebSocket to implement a real-time online ordering system: With the popularity of the Internet and the advancement of technology, more and more restaurants have begun to provide online ordering services. In order to implement a real-time online ordering system, we can use JavaScript and WebSocket technology. WebSocket is a full-duplex communication protocol based on the TCP protocol, which can realize real-time two-way communication between the client and the server. In the real-time online ordering system, when the user selects dishes and places an order
JavaScript and WebSocket: Building an efficient real-time weather forecast system Introduction: Today, the accuracy of weather forecasts is of great significance to daily life and decision-making. As technology develops, we can provide more accurate and reliable weather forecasts by obtaining weather data in real time. In this article, we will learn how to use JavaScript and WebSocket technology to build an efficient real-time weather forecast system. This article will demonstrate the implementation process through specific code examples. We
How to use WebSocket and JavaScript to implement an online reservation system. In today's digital era, more and more businesses and services need to provide online reservation functions. It is crucial to implement an efficient and real-time online reservation system. This article will introduce how to use WebSocket and JavaScript to implement an online reservation system, and provide specific code examples. 1. What is WebSocket? WebSocket is a full-duplex method on a single TCP connection.
JavaScript tutorial: How to get HTTP status code, specific code examples are required. Preface: In web development, data interaction with the server is often involved. When communicating with the server, we often need to obtain the returned HTTP status code to determine whether the operation is successful, and perform corresponding processing based on different status codes. This article will teach you how to use JavaScript to obtain HTTP status codes and provide some practical code examples. Using XMLHttpRequest
How to use JavaWebsocket to implement online audio and video calls? In today's digital age, real-time communication is becoming more and more common. Whether it is remote collaboration at work or remote communication with relatives and friends at home, real-time audio and video calls have become an indispensable part of people. This article will introduce how to use JavaWebsocket to implement online audio and video calls, and provide specific code examples. 1. Understand WebsocketWebsocket is a new technology in HTML5
Usage: In JavaScript, the insertBefore() method is used to insert a new node in the DOM tree. This method requires two parameters: the new node to be inserted and the reference node (that is, the node where the new node will be inserted).
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