Example learning of DOM operations and events in jquery-form validation_jquery

Obviously, doing so will result in a better user experience.
html code:

Copy code The code is as follows:

username:

jquery code:

Copy code The code is as follows:

Okay, now let’s analyze the jquery statements inside in detail.
Look at the DOM operation statement first
$('form:input') This is used to find all the , , <select>, <button> elements under the form element . <br>Similarly, there are $(':text'), $(':checkbox'), etc. Anyway, as long as you understand that only within the form, you can get the corresponding elements through the form selector. <br>parent() is the parent node that finds the matching element. find() is used to search for elements that match an expression. remove() is used to delete elements. <br>is() uses an expression to check the element collection of the current selector, and returns true if there is at least one matching element. <br>appendTo() is to add an element to another element. <br>triggerHandler() is a characteristic method that triggers specific events on the element. <br>Look at the event statement again. <br>keyup() is triggered when the key is pressed upward. <br>It should be easy to understand the above code after understanding each method <br>You may have questions about this code. $parent.find(".formtips").remove(); <br>This sentence is to ensure that there is only one element prompted later. 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What is LaravelValidationLaravelValidation is La</p> </div> <div class="phphistorical_Version2_mids"> <a href="https://www.php.cn/faq/565652.html" title="How to implement form validation for web applications using Golang" class="phphistorical_Version2_mids_img"> <img onerror="this.onerror=''; this.src='/static/imghw/default1.png'" src="/static/imghw/default1.png" class="lazy" data-src="https://img.php.cn/upload/article/000/887/227/168756892379623.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="How to implement form validation for web applications using Golang" /> </a> <a href="https://www.php.cn/faq/565652.html" title="How to implement form validation for web applications using Golang" class="phphistorical_Version2_mids_title">How to implement form validation for web applications using Golang</a> <span class="Articlelist_txts_time">Jun 24, 2023 am 09:08 AM</span> <p class="Articlelist_txts_p">Form validation is a very important link in web application development. It can check the validity of the data before submitting the form data to avoid security vulnerabilities and data errors in the application. Form validation for web applications can be easily implemented using Golang. This article will introduce how to use Golang to implement form validation for web applications. 1. Basic elements of form validation Before introducing how to implement form validation, we need to know what the basic elements of form validation are. Form elements: form elements are</p> </div> <div class="phphistorical_Version2_mids"> <a href="https://www.php.cn/faq/586515.html" title="PHP form validation tips: How to use the filter_input function to verify user input" class="phphistorical_Version2_mids_img"> <img onerror="this.onerror=''; this.src='/static/imghw/default1.png'" src="/static/imghw/default1.png" class="lazy" data-src="https://img.php.cn/upload/article/000/887/227/169085109686329.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="PHP form validation tips: How to use the filter_input function to verify user input" /> </a> <a href="https://www.php.cn/faq/586515.html" title="PHP form validation tips: How to use the filter_input function to verify user input" class="phphistorical_Version2_mids_title">PHP form validation tips: How to use the filter_input function to verify user input</a> <span class="Articlelist_txts_time">Aug 01, 2023 am 08:51 AM</span> <p class="Articlelist_txts_p">PHP form validation tips: How to use the filter_input function to verify user input Introduction: When developing web applications, forms are an important tool for interacting with users. Correctly validating user input is one of the key steps to ensure data integrity and security. PHP provides the filter_input function, which can easily verify and filter user input. This article will introduce how to use the filter_input function to verify user input and provide relevant code examples. one,</p> </div> <div class="phphistorical_Version2_mids"> <a href="https://www.php.cn/faq/624932.html" title="How to handle form validation using middleware in Laravel" class="phphistorical_Version2_mids_img"> <img onerror="this.onerror=''; this.src='/static/imghw/default1.png'" src="/static/imghw/default1.png" class="lazy" data-src="https://img.php.cn/upload/article/000/465/014/169891184483303.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="How to handle form validation using middleware in Laravel" /> </a> <a href="https://www.php.cn/faq/624932.html" title="How to handle form validation using middleware in Laravel" class="phphistorical_Version2_mids_title">How to handle form validation using middleware in Laravel</a> <span class="Articlelist_txts_time">Nov 02, 2023 pm 03:57 PM</span> <p class="Articlelist_txts_p">How to use middleware to handle form validation in Laravel, specific code examples are required Introduction: Form validation is a very common task in Laravel. In order to ensure the validity and security of the data entered by users, we usually verify the data submitted in the form. Laravel provides a convenient form validation function and also supports the use of middleware to handle form validation. This article will introduce in detail how to use middleware to handle form validation in Laravel and provide specific code examples.</p> </div> <div class="phphistorical_Version2_mids"> <a href="https://www.php.cn/faq/569847.html" title="Form validation and filtering methods in PHP?" class="phphistorical_Version2_mids_img"> <img onerror="this.onerror=''; this.src='/static/imghw/default1.png'" src="/static/imghw/default1.png" class="lazy" data-src="https://img.php.cn/upload/article/000/887/227/168804749465254.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="Form validation and filtering methods in PHP?" /> </a> <a href="https://www.php.cn/faq/569847.html" title="Form validation and filtering methods in PHP?" class="phphistorical_Version2_mids_title">Form validation and filtering methods in PHP?</a> <span class="Articlelist_txts_time">Jun 29, 2023 pm 10:04 PM</span> <p class="Articlelist_txts_p">PHP is a scripting language widely used in web development, and its form validation and filtering are very important parts. 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Among them, form validation is a very basic and important function. In this article, we will introduce how to perform form validation operations in ThinkPHP6. 1. Definition of validation rules In ThinkPHP6, validation rules need to be defined in the controller. We can define the rules by defining a $validate attribute in the controller, as shown below: usethinkVa</p> </div> </div> <a href="https://www.php.cn/web-designer.html" class="phpgenera_Details_mainL4_botton"> <span>See all articles</span> <img src="/static/imghw/down_right.png" alt="" /> </a> </div> </div> </div> </main> <footer> <div class="footer"> <div class="footertop"> <img src="/static/imghw/logo.png" alt=""> <p>Public welfare online PHP training，Help PHP learners grow quickly！</p> </div> <div class="footermid"> <a href="https://www.php.cn/about/us.html">About us</a> <a href="https://www.php.cn/about/disclaimer.html">Disclaimer</a> <a href="https://www.php.cn/update/article_0_1.html">Sitemap</a> </div> <div class="footerbottom"> <p> © php.cn All rights reserved </p> </div> </div> </footer> <input type="hidden" id="verifycode" value="/captcha.html"> <script>layui.use(['element', 'carousel'], function () {var element = layui.element;$ = layui.jquery;var carousel = layui.carousel;carousel.render({elem: '#test1', width: '100%', height: '330px', arrow: 'always'});$.getScript('/static/js/jquery.lazyload.min.js', function () {$("img").lazyload({placeholder: "/static/images/load.jpg", effect: "fadeIn", threshold: 200, skip_invisible: false});});});</script> <script src="/static/js/common_new.js"></script> <script type="text/javascript" src="/static/js/jquery.cookie.js?1743686469"></script> <script src="https://vdse.bdstatic.com//search-video.v1.min.js"></script> <link rel='stylesheet' id='_main-css' href='/static/css/viewer.min.css?2' type='text/css' media='all' /> <script type='text/javascript' src='/static/js/viewer.min.js?1'></script> <script type='text/javascript' src='/static/js/jquery-viewer.min.js'></script> <script type="text/javascript" src="/static/js/global.min.js?5.5.53"></script> <script> var _paq = window._paq = window._paq || []; /* tracker methods like "setCustomDimension" should be called before "trackPageView" */ _paq.push(['trackPageView']); _paq.push(['enableLinkTracking']); (function () { var u = "https://tongji.php.cn/"; _paq.push(['setTrackerUrl', u + 'matomo.php']); _paq.push(['setSiteId', '9']); var d = document, g = d.createElement('script'), s = d.getElementsByTagName('script')[0]; g.async = true; g.src = u + 'matomo.js'; s.parentNode.insertBefore(g, s); })(); </script> <script> // top layui.use(function () { var util = layui.util; util.fixbar({ on: { mouseenter: function (type) { layer.tips(type, this, { tips: 4, fixed: true, }); }, mouseleave: function (type) { layer.closeAll("tips"); }, }, }); }); document.addEventListener("DOMContentLoaded", (event) => { // 定义一个函数来处理滚动链接的点击事件 function setupScrollLink(scrollLinkId, targetElementId) { const scrollLink = document.getElementById(scrollLinkId); const targetElement = document.getElementById(targetElementId); if (scrollLink && targetElement) { scrollLink.addEventListener("click", (e) => { e.preventDefault(); // 阻止默认链接行为 targetElement.scrollIntoView({ behavior: "smooth" }); // 平滑滚动到目标元素 }); } else { console.warn( `Either scroll link with ID '${scrollLinkId}' or target element with ID '${targetElementId}' not found.` ); } } // 使用该函数设置多个滚动链接 setupScrollLink("Article_Details_main1L2s_1", "article_main_title1"); setupScrollLink("Article_Details_main1L2s_2", "article_main_title2"); setupScrollLink("Article_Details_main1L2s_3", "article_main_title3"); setupScrollLink("Article_Details_main1L2s_4", "article_main_title4"); setupScrollLink("Article_Details_main1L2s_5", "article_main_title5"); setupScrollLink("Article_Details_main1L2s_6", "article_main_title6"); // 可以继续添加更多的滚动链接设置 }); window.addEventListener("scroll", function () { var fixedElement = document.getElementById("Article_Details_main1Lmain"); var scrollTop = window.scrollY || document.documentElement.scrollTop; // 兼容不同浏览器 var clientHeight = window.innerHeight || document.documentElement.clientHeight; // 视口高度 var scrollHeight = document.documentElement.scrollHeight; // 页面总高度 // 计算距离底部的距离 var distanceToBottom = scrollHeight - scrollTop - clientHeight; // 当距离底部小于或等于300px时，取消固定定位 if (distanceToBottom <= 980) { fixedElement.classList.remove("Article_Details_main1Lmain"); fixedElement.classList.add("Article_Details_main1Lmain_relative"); } else { // 否则，保持固定定位 fixedElement.classList.remove("Article_Details_main1Lmain_relative"); fixedElement.classList.add("Article_Details_main1Lmain"); } }); </script> </body> </html>