HTML, CSS, and jQuery: Build a beautiful login form validation
In web development, the login form is a common component. Form validation is an important step to ensure security and accuracy when users log in to a website or application. This article will introduce how to build a beautiful login form verification using HTML, CSS and jQuery, and provide specific code examples.
Step 1: Initialize the HTML structure
First, let us create the HTML structure. Here is a basic login form example:
<form id="login-form"> <h2 id="用户登录">用户登录</h2> <input type="text" id="username" placeholder="用户名"> <input type="password" id="password" placeholder="密码"> <button type="submit">登录</button> </form>
Step 2: Add CSS Styles
To make the login form look prettier, we need to add some CSS styles to it. Here is a basic CSS example:
#login-form { max-width: 300px; margin: 0 auto; padding: 20px; border: 1px solid #ccc; border-radius: 5px; text-align: center; } h2 { margin-bottom: 20px; } input { width: 100%; padding: 10px; margin-bottom: 10px; border: 1px solid #ccc; border-radius: 3px; } button { width: 100%; padding: 10px; background-color: #007bff; color: #fff; border: none; border-radius: 3px; cursor: pointer; } button:hover { background-color: #0056b3; }
Step Three: Write jQuery Validation Logic
Now, let’s use jQuery to add form validation logic. We will verify the username and password when submitting the form. If the verification is successful, the user will be allowed to log in; if the verification fails, an error message will be displayed.
The following is a basic jQuery example:
$(document).ready(function() { $("#login-form").submit(function(event) { event.preventDefault(); // 阻止表单提交 var username = $("#username").val(); var password = $("#password").val(); // 对用户名和密码进行验证 if (username === "" || password === "") { $("#login-error").html("请填写用户名和密码"); } else if (username !== "admin" || password !== "123456") { $("#login-error").html("用户名或密码不正确"); } else { $("#login-error").html(""); // 清空错误消息 // 登录成功之后的操作 } }); });
Step 4: Display the error message
In order to display the error message, we need to add a display to the HTML structure Elements of the error message.
<div id="login-error"></div>
When the form is submitted, we dynamically update this element based on the validation results.
Full code example
Here is a complete example with all the HTML, CSS and jQuery code:
<div id="login-error"></div> <script> /* jQuery验证逻辑 */ </script>登录表单验证
Conclusion
With HTML, CSS and jQuery, We can easily build a beautiful login form validation. When the user submits the form, we use jQuery to validate the input and display an error message based on the validation result. Hope this article helps you!
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实现方法:1、用“$("img").delay(毫秒数).fadeOut()”语句,delay()设置延迟秒数;2、用“setTimeout(function(){ $("img").hide(); },毫秒值);”语句,通过定时器来延迟。

区别:1、axios是一个异步请求框架,用于封装底层的XMLHttpRequest,而jquery是一个JavaScript库,只是顺便封装了dom操作;2、axios是基于承诺对象的,可以用承诺对象中的方法,而jquery不基于承诺对象。

修改方法:1、用css()设置新样式,语法“$(元素).css("min-height","新值")”;2、用attr(),通过设置style属性来添加新样式,语法“$(元素).attr("style","min-height:新值")”。

增加元素的方法:1、用append(),语法“$("body").append(新元素)”,可向body内部的末尾处增加元素;2、用prepend(),语法“$("body").prepend(新元素)”,可向body内部的开始处增加元素。

删除方法:1、用empty(),语法“$("div").empty();”,可删除所有子节点和内容;2、用children()和remove(),语法“$("div").children().remove();”,只删除子元素,不删除内容。

在jquery中,apply()方法用于改变this指向,使用另一个对象替换当前对象,是应用某一对象的一个方法,语法为“apply(thisobj,[argarray])”;参数argarray表示的是以数组的形式进行传递。

on()方法有4个参数:1、第一个参数不可省略,规定要从被选元素添加的一个或多个事件或命名空间;2、第二个参数可省略,规定元素的事件处理程序;3、第三个参数可省略,规定传递到函数的额外数据;4、第四个参数可省略,规定当事件发生时运行的函数。

去掉方法:1、用“$(selector).removeAttr("readonly")”语句删除readonly属性;2、用“$(selector).attr("readonly",false)”将readonly属性的值设置为false。


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