When we design forms, we may need to use the select drop-down option control. Unfortunately, the default select control in IE browser has a very ugly appearance, and cannot be controlled with styles, and images and other information cannot be added to the options. Today I will explain through examples how to use CSS and jQuery to create a beautiful drop-down option menu.
XHTML
请选择城市长沙北京南京堪培拉多伦多
As you can see, we use div to replace the native select tag of the drop-down option control.
CSS
#dropdown{width:186px; margin:80px auto; position:relative} #dropdown p{width:150px; height:24px; line-height:24px; padding-left:4px; padding-right:30px; border:1px solid #a9c9e2; background:#e8f5fe url(arrow.gif) no-repeat right 4px; color:#807a62; cursor:pointer} #dropdown ul{width:184px; background:#e8f5fe; margin-top:2px; border:1px solid #a9c9e2; position:absolute; display:none} #dropdown ul li{height:24px; line-height:24px; text-indent:10px} #dropdown ul li a{display:block; height:24px; color:#807a62; text-decoration:none} #dropdown ul li a:hover{background:#c6dbfc; color:#369}
Don’t talk too much about styles. You can modify the background color and font color in CSS, and even other arbitrarily defined styles. There is a small icon with a drop-down arrow, which has been packaged in the attachment.
jQuery
First, when "Please select a city" is clicked, determine whether the drop-down layer "ul" is displayed. If so, hide the drop-down option, otherwise open (slide down) the drop-down option
$("#dropdown p").click(function(){ var ul = $("#dropdown ul"); if(ul.css("display")=="none"){ ul.slideDown("fast"); }else{ ul.slideUp("fast"); } });
Then, when the drop-down option is clicked, get the option content, write the option content into the
tag, and hide the drop-down option.
$("#dropdown ul li a").click(function(){ var txt = $(this).text(); $("#dropdown p").html(txt); $("#dropdown ul").hide(); });
This completes a simple drop-down option operation, isn’t it very simple?
Of course, if you need to get the value of the option when interacting with the background, you need to define XHTML first.
请选择城市长沙北京南京堪培拉多伦多
As you can see from the code, adding a rel attribute to the a tag and assigning it a value is equivalent to the value of the option tag of select. The next step is to get the rel value through jQuery, please see the code:
$("#dropdown ul li a").click(function(){ var txt = $(this).text(); $("#dropdown p").html(txt); var value = $(this).attr("rel"); $("#dropdown ul").hide(); $("#result").html("您选择了"+txt+",值为:"+value); });
This completes a complete drop-down option operation.
The above is the entire content of this article, I hope you all like it.
【Recommended related tutorials】
1. JavaScript video tutorial
2. JavaScript online manual
3. bootstrap tutorial

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。

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")”。

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。

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。

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。

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。

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。

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。


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function

Dreamweaver Mac version
Visual web development tools

ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment

SublimeText3 Mac version
God-level code editing software (SublimeText3)

mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),
