Date selection control based on jQuery_jquery
But there are also some problems. Firstly, drawing the calendar is a bit slow. Secondly, the compatibility is not very good with IE Only. Thirdly, it is not based on jQuery haha.
That’s still the old rule, check the effect before doing it
This is a cooler Ext style.
From the picture above, we can see that this control actually has two views, a date and month view, and a year and month selection view.
1: Let’s start with HTML
Determining HTML for the date control is actually relatively simple, because it is obviously a list data format, and of course it mainly uses table.
The two views are wrapped with two Divs respectively. You can switch the views by controlling the display and hiding of the divs. For the complete HTMl structure, you can use IEDeveloper to take a look at the Demo structure. I took a screenshot myself 
2: Write CSS based on HTML and renderings
In fact, because it is in Ext style, I directly copy the ext css and images. .
CSS will not be analyzed and code will be uploaded directly.
Because the syntax highlighting in the blog park does not support CSS, I will not post it here. Please give me a download address:
All images used:
3: After finishing the CSS, we started writing our javascript.
Up there is a complete code
;(function($) {
var userAgent = window.navigator.userAgent.toLowerCase();
$.browser.msie8 = $.browser.msie && /msie 8.0/i.test(userAgent);
$.browser.msie7 = $.browser.msie && /msie 7.0/i.test(userAgent);
$.browser.msie6 = !$.browser.msie8 && !$.browser.msie7 && $.browser.msie && /msie 6.0/i.test(userAgent);
Date.prototype.Format = function(format) {
var o = {
"M ": this.getMonth() 1,
"d ": this.getDate(),
"h ": this.getHours(),
"H ": this.getHours(),
"m ": this.getMinutes(),
"s ": this.getSeconds(),
"q ": Math.floor((this.getMonth() 3) / 3),
"w": "0123456".indexOf(this.getDay()),
"S": this.getMilliseconds()
};
if (/(y )/.test(format)) {
format = format.replace(RegExp.$1, (this.getFullYear() "").substr(4 - RegExp.$1.length));
}
for (var k in o) {
if (new RegExp("(" k ")").test(format))
format = format.replace(RegExp.$1,
RegExp.$1.length == 1 ? o[k] :
("00" o[k]).substr(("" o[k]).length));
}
return format;
};
function DateAdd(interval, number, idate) {
number = parseInt(number);
var date;
if (typeof (idate) == "string") {
date = idate.split(/D/);
eval("var date = new Date(" date.join(",") ")");
}
if (typeof (idate) == "object") {
date = new Date(idate.toString());
}
switch (interval) {
case "y": date.setFullYear(date.getFullYear() number); break;
case "m": date.setMonth(date.getMonth() number); break;
case "d": date.setDate(date.getDate() number); break;
case "w": date.setDate(date.getDate() 7 * number); break;
case "h": date.setHours(date.getHours() number); break;
case "n": date.setMinutes(date.getMinutes() number); break;
case "s": date.setSeconds(date.getSeconds() number); break;
case "l": date.setMilliseconds(date.getMilliseconds() number); break;
}
return date;
};
$.fn.datepicker = function(o) {
var def = {
weekStart: 0,
weekName: ["日", "一", "二", "三", "四", "五", "六"], //星期的格式
monthName: ["一", "二", "三", "四", "五", "六", "七", "八", "九", "十", "十一", "十二"], //月份的格式
monthp: "月",
Year: new Date().getFullYear(), //定义年的变量的初始值
Month: new Date().getMonth() 1, //定义月的变量的初始值
Day: new Date().getDate(), //定义日的变量的初始值
today: new Date(),
btnOk: " 确定 ",
btnCancel: " 取消 ",
btnToday: "今天",
inputDate: null,
onReturn: false,
version: "1.1",
applyrule: false, //function(){};return rule={startdate,endate};
showtarget: null,
picker: ""
};
$.extend(def, o);
var cp = $("#BBIT_DP_CONTAINER");
if (cp.length == 0) {
var cpHA = [];
cpHA.push("
if ($.browser.msie6) {
cpHA.push('');
}
cpHA.push("
//输出下来框
cpHA.push("
| ", def.monthName[0], " | ", def.monthName[6], " | "); | |
| ", def.monthName[1], " | ", def.monthName[7], " | "); | |
| ", def.monthName[2], " | ", def.monthName[8], " | "); | |
| ", def.monthName[3], " | ", def.monthName[9], " | "); | |
| ", def.monthName[4], " | ", def.monthName[10], " | "); | |
| ", def.monthName[5], " | ", def.monthName[11], " | "); | |
| "); | |||
cpHA.push("
cpHA.push("
var s = cpHA.join("");
$(document.body).append(s);
var cp = $("#BBIT_DP_CONTAINER");
initevents();
}
function initevents() {
//1 today btn;
$("#BBIT-DP-TODAY").click(returntoday);
cp.click(returnfalse);
$("#BBIT_DP_INNER tbody").click(tbhandler);
$("#BBIT_DP_LEFTBTN").click(prevm);
$("#BBIT_DP_RIGHTBTN").click(nextm);
$("#BBIT_DP_YMBTN").click(showym);
$("#BBIT-DP-MP").click(mpclick);
$("#BBIT-DP-MP-PREV").click(mpprevy);
$("#BBIT-DP-MP-NEXT").click(mpnexty);
$("#BBIT-DP-MP-OKBTN").click(mpok);
$("#BBIT-DP-MP-CANCELBTN").click(mpcancel);
}
function mpcancel() {
$("#BBIT-DP-MP").animate({ top: -193 }, { duration: 200, complete: function() { $("#BBIT-DP-MP").hide(); } });
return false;
}
function mpok() {
def.Year = def.cy;
def.Month = def.cm 1;
def.Day = 1;
$("#BBIT-DP-MP").animate({ top: -193 }, { duration: 200, complete: function() { $("#BBIT-DP-MP").hide(); } });
writecb();
return false;
}
function mpprevy() {
var y = def.ty - 10
def.ty = y;
rryear(y);
return false;
}
function mpnexty() {
var y = def.ty 10
def.ty = y;
rryear(y);
return false;
}
function rryear(y) {
var s = y - 4;
var ar = [];
for (var i = 0; i < 5; i ) {
ar.push(s i);
ar.push(s i 5);
}
$("#BBIT-DP-MP td.bbit-dp-mp-year").each(function(i) {
if (def.Year == ar[i]) {
$(this).addClass("bbit-dp-mp-sel");
}
else {
$(this).removeClass("bbit-dp-mp-sel");
}
$(this).html("" ar[i] "").attr("xyear", ar[i]);
});
}
function mpclick(e) {
var panel = $(this);
var et = e.target || e.srcElement;
var td = getTd(et);
if (td == null) {
return false;
}
if ($(td).hasClass("bbit-dp-mp-month")) {
if (!$(td).hasClass("bbit-dp-mp-sel")) {
var ctd = panel.find("td.bbit-dp-mp-month.bbit-dp-mp-sel");
if (ctd.length > 0) {
ctd.removeClass("bbit-dp-mp-sel");
}
$(td).addClass("bbit-dp-mp-sel")
def.cm = parseInt($(td).attr("xmonth"));
}
}
if ($(td).hasClass("bbit-dp-mp-year")) {
if (!$(td).hasClass("bbit-dp-mp-sel")) {
var ctd = panel.find("td.bbit-dp-mp-year.bbit-dp-mp-sel");
if (ctd.length > 0) {
ctd.removeClass("bbit-dp-mp-sel");
}
$(td).addClass("bbit-dp-mp-sel")
def.cy = parseInt($(td).attr("xyear"));
}
}
return false;
}
function showym() {
var mp = $("#BBIT-DP-MP");
var y = def.Year;
def.cy = def.ty = y;
var m = def.Month - 1;
def.cm = m;
var ms = $("#BBIT-DP-MP td.bbit-dp-mp-month");
for (var i = ms.length - 1; i >= 0; i--) {
var ch = $(ms[i]).attr("xmonth");
if (ch == m) {
$(ms[i]).addClass("bbit-dp-mp-sel");
}
else {
$(ms[i]).removeClass("bbit-dp-mp-sel");
}
}
rryear(y);
mp.css("top", -193).show().animate({ top: 0 }, { duration: 200 });
}
function getTd(elm) {
if (elm.tagName.toUpperCase() == "TD") {
return elm;
}
else if (elm.tagName.toUpperCase() == "BODY") {
return null;
}
else {
var p = $(elm).parent();
if (p.length > 0) {
if (p[0].tagName.toUpperCase() != "TD") {
return getTd(p[0]);
}
else {
return p[0];
}
}
}
return null;
}
function tbhandler(e) {
var et = e.target || e.srcElement;
var td = getTd(et);
if (td == null) {
return false;
}
var $td = $(td);
if (!$(td).hasClass("bbit-dp-disabled")) {
var s = $td.attr("xdate");
var arrs = s.split("-");
cp.data("indata", new Date(arrs[0], parseInt(arrs[1], 10) - 1, arrs[2]));
returndate();
}
return false;
}
function returnfalse() {
return false;
}
function prevm() {
if (def.Month == 1) {
def.Year--;
def.Month = 12;
}
else {
def.Month--
}
writecb();
return false;
}
function nextm() {
if (def.Month == 12) {
def.Year ;
def.Month = 1;
}
else {
def.Month
}
writecb();
return false;
}
function returntoday() {
cp.data("indata", new Date());
returndate();
}
function returndate() {
var ct = cp.data("ctarget");
var ck = cp.data("cpk");
var re = cp.data("onReturn");
var ndate = cp.data("indata")
var ads = cp.data("ads");
var ade = cp.data("ade");
var dis = false;
if (ads && ndate < ads) {
dis = true;
}
if (ade && ndate > ade) {
dis = true;
}
if (dis) {
return;
}
if (re && jQuery.isFunction(re)) {
re.call(ct[0], cp.data("indata"));
}
else {
ct.val(cp.data("indata").Format("yyyy-MM-dd"));
}
ck.attr("isshow", "0");
cp.removeData("ctarget").removeData("cpk").removeData("indata").removeData("onReturn")
.removeData("ads").removeData("ade");
cp.css("visibility", "hidden");
ct = ck = null;
}
function writecb() {
var tb = $("#BBIT_DP_INNER tbody");
$("#BBIT_DP_YMBTN").html(def.monthName[def.Month - 1] def.monthp " " def.Year);
var firstdate = new Date(def.Year, def.Month - 1, 1);
var diffday = def.weekStart - firstdate.getDay();
var showmonth = def.Month - 1;
if (diffday > 0) {
diffday -= 7;
}
var startdate = DateAdd("d", diffday, firstdate);
var enddate = DateAdd("d", 42, startdate);
var ads = cp.data("ads");
var ade = cp.data("ade");
var bhm = [];
var tds = def.today.Format("yyyy-MM-dd");
var indata = cp.data("indata");
var ins = indata != null ? indata.Format("yyyy-MM-dd") : "";
for (var i = 1; i <= 42; i ) {
if (i % 7 == 1) {
bhm.push("
}
var ndate = DateAdd("d", i - 1, startdate);
var tdc = [];
var dis = false;
if (ads && ndate < ads) {
dis = true;
}
if (ade && ndate > ade) {
dis = true;
}
if (ndate.getMonth() < showmonth) {
tdc.push("bbit-dp-prevday");
}
else if (ndate.getMonth() > showmonth) {
tdc.push("bbit-dp-nextday");
}
if (dis) {
tdc.push("bbit-dp-disabled");
}
else {
tdc.push("bbit-dp-active");
}
var s = ndate.Format("yyyy-MM-dd");
if (s == tds) {
tdc.push("bbit-dp-today");
}
if (s == ins) {
tdc.push("bbit-dp-selected");
}
bhm.push("
if (i % 7 == 0) {
bhm.push("
}
}
tb.html(bhm.join(""));
}
var dateReg = /^(d{1,4})(-|/|.)(d{1,2})2(d{1,2})$/;
return $(this).each(function() {
var obj = $(this).addClass("bbit-dp-input");
var picker = $(def.picker);
def.showtarget == null && obj.after(picker);
picker.click(function(e) {
var isshow = $(this).attr("isshow");
//先隐藏
var me = $(this);
if (cp.css("visibility") == "visible") {
cp.css(" visibility", "hidden");
}
if (isshow == "1") {
me.attr("isshow", "0");
cp.removeData("ctarget").removeData("cpk").removeData("indata").removeData("onReturn");
return false;
}
var v = obj.val();
if (v != "") {
v = v.match(dateReg);
}
if (v == null || v == "") {
def.Year = new Date().getFullYear();
def.Month = new Date().getMonth() 1;
def.Day = new Date().getDate();
def.inputDate = null
}
else {
def.Year = parseInt(v[1], 10);
def.Month = parseInt(v[3], 10);
def.Day = parseInt(v[4], 10);
def.inputDate = new Date(def.Year, def.Month - 1, def.Day);
}
cp.data("ctarget", obj).data("cpk", me).data("indata", def.inputDate).data("onReturn", def.onReturn);
if (def.applyrule && $.isFunction(def.applyrule)) {
var rule = def.applyrule.call(obj, obj[0].id);
if (rule) {
if (rule.startdate) {
cp.data("ads", rule.startdate);
}
else {
cp.removeData("ads");
}
if (rule.enddate) {
cp.data("ade", rule.enddate);
}
else {
cp.removeData("ade");
}
}
}
else {
cp.removeData("ads").removeData("ade")
}
writecb();
$("#BBIT-DP-T").height(cp.height());
var t = def.showtarget || obj;
var pos = t.offset();
var height = t.outerHeight();
var newpos = { left: pos.left, top: pos.top height };
var w = cp.width();
var h = cp.height();
var bw = document.documentElement.clientWidth;
var bh = document.documentElement.clientHeight;
if ((newpos.left w) >= bw) {
newpos.left = bw - w - 2;
}
if ((newpos.top h) >= bh) {
newpos.top = pos.top - h - 2;
}
if (newpos.left < 0) {
newpos.left = 10;
}
if (newpos.top < 0) {
newpos.top = 10;
}
$("#BBIT-DP-MP").hide();
newpos.visibility = "visible";
cp.css(newpos);
//cp.show();
$(this).attr("isshow", "1");
$(document).one("click", function(e) {
me.attr("isshow", "0");
cp.removeData("ctarget").removeData("cpk").removeData("indata");
cp.css("visibility", "hidden");
});
return false;
});
});
};
})(jQuery);
那接着就是分析一下实现的主要过程和一些注意的要点:
首先还是套版化编写jQuery控件的套子:
;(function($) {
//You can also use $.fn.extend(datepicker:function(o){})
$.fn.datepicker= function(o) {
} ( Comments have been added to the code to explain the meaning of these parameters. Several parameters are set for multi-language, such as weekName, monthName
Copy code
Year: new Date().getFullYear(), //The initial value of the variable that defines the year
Month: new Date().getMonth() 1, //The initial value of the variable that defines the month
Day: new Date().getDate(), //The initial value of the variable that defines the day
today: new Date(),//today
btnOk: "OK",//OK button Text
btnCancel: "Cancel", //The text of the cancel button
btnToday: "Today", //The text of today's button
inputDate: null, //Useless, it will only be used for storage in the code Data
onReturn: false, //Function called back when a date is selected
version: "1.0", //Version
applyrule: false, //Date selection rules, you can set a selectable date range function (){};return rule={startdate,endate};
showtarget: null, //Display carrier, the object on which the calendar expansion depends, the default is the object itself
picker: "" //Additional click event Object
};
$.extend(def, o);//Use the passed parameters to fill in the default
The second part is to initialize the month view and year and month selection. The HTML of the view is
Copy the code
cpHA. push("
if ($.browser.msie6) { / /If it is IE6 pop-up layer cover select
cpHA.push('');
}
cpHA.push("
| "); //头yo cpHA.push("
cpHA.push(" | |||
| "); //week cpHA.push ("
cpHA.push(""); cpHA.push(""); var s = cpHA.join(""); $(document.body).append(s); //Add to body cp = $("#BBIT_DP_CONTAINER"); //Get it again Once initevents(); //Initialization event } A key point here is that the HTML output and event initialization of the date are only done once, because basically two will not be opened on the same page at the same time. There are also some special custom attributes in the generated HTML. If you look carefully, you will find that these attributes will play a big role in subsequent time processing. So let’s take a look at the event
Copy the code The code is as follows:
$("#BBIT- DP-TODAY").click(returntoday);//Today's button event cp.click(returnfalse);//Prevent bubbling $("#BBIT_DP_INNER tbody").click(tbhandler);/ /Add a click event to the body in the middle of the month view instead of adding $("#BBIT_DP_LEFTBTN").click(prevm) to each td;//Last month $("#BBIT_DP_RIGHTBTN").click( nextm);//Next month $("#BBIT_DP_YMBTN").click(showym);//Switch to year and month view $("#BBIT-DP-MP").click(mpclick) ;//The click event of the year and month view is also used for distribution $("#BBIT-DP-MP-PREV").click(mpprevy);//Previous year $("#BBIT- DP-MP-NEXT").click(mpnexty);//Next year $("#BBIT-DP-MP-OKBTN").click(mpok);//Event of ok button $ ("#BBIT-DP-MP-CANCELBTN").click(mpcancel);//Cancel button event Add events to each element that needs to be clicked. There are two places here. It is quite special. For a click view of a monthly view, the traditional method is to add events to each TD. However, my TD does not exist at this time. However, if an event is added every time a TD is generated, then the impact will be Performance, so we directly add a click event to the container and distribute the event by judging the event source. Selecting the view in another year and month also has the same logic as above, so let's analyze the click event of the month view. , in fact, when each TD is generated, an xdate custom attribute  will be registered. Let’s take a look at the tbhandler function
Copy code The code is as follows:
function tbhandler(e) { var et = e.target || e.srcElement; //Find the event source var td = getTd(et); //The event source recursively looks up td if (td == null) { return false; } var $td = $(td); . if (!$(td).hasClass("bbit-dp-disabled")) {If it is not disabled var s = $td.attr("xdate");//Get the self value of td Define attribute date data var arrs = s.split("-"); cp.data("indata", new Date(arrs[0], parseInt(arrs[1], 10) - 1, arrs[2])); returndate();//Return date . } return false; } All date selection times After initialization (one-time), you need to add click events to each picker
Copy the code The code is as follows:
return $(this).each(function() { var obj = $(this).addClass("bbit-dp-input");//Add style to input var picker = $(def.picker);//Get the picker object //If showtarget is not null, this will register the picker behind the input //Otherwise the user handles the picker position by himself, that is, picker It already exists on the page itself //You can look at the difference between calls 1 and 3 in the example def.showtarget == null && obj.after(picker); picker.click(function( e) { ....//Omit code }); The click event of picker is relatively long. I think it is better to talk about it separately. The first point is The second is the processing of real-life hidden events, the second is the processing of window edge issues, and the third is the processing of date range rules.
Copy code The code is as follows:
function(e) { //Get whether it is currently displayed var isshow = $(this).attr("isshow"); var me = $(this); //If displayed, then hidden, used to handle the logic of clicking the picker to display it and then clicking the picker to hide it if (cp.css("visibility") == "visible") { cp. css(" visibility", "hidden"); } //Similarly if it is displayed if (isshow == "1") { me.attr("isshow", " 0"); //Remover temporary data, because it is a singleton, it needs to indicate which input is currently cp.removeData("ctarget").removeData("cpk").removeData("indata"). removeData("onReturn"); return false; //Prevent bubbling } //If hidden, get the input value var v = obj.val(); if (v != "") { v = v.match(dateReg);//Verify whether the format is correct } if (v == null || v == "") { //If the format is incorrect or empty, use the current date def.Year = new Date().getFullYear(); def.Month = new Date().getMonth() 1; def. Day = new Date().getDate(); def.inputDate = null } else { //Otherwise use the input date def.Year = parseInt(v[1 ], 10); def.Month = parseInt(v[3], 10); def.Day = parseInt(v[4], 10); def.inputDate = new Date(def .Year, def.Month - 1, def.Day); } //Register temporary data cp.data("ctarget", obj).data("cpk", me).data ("indata", def.inputDate).data("onReturn", def.onReturn); //Call the rule and return an optional date range if (def.applyrule && $.isFunction(def. applyrule)) { var rule = def.applyrule.call(obj, obj[0].id); if (rule) { if (rule.startdate) { cp.data ("ads", rule.startdate); } else { cp.removeData("ads"); } if (rule.enddate) { cp. data("ade", rule.enddate); } else { cp.removeData("ade"); } } } else { //Remove the restriction if it does not exist cp.removeData("ads").removeData("ade") } //The content of the monthly calendar is td writecb(); $("#BBIT-DP-T").height(cp.height()); //Get the displayed attached object var t = def.showtarget || obj; / /Get the position of the object var pos = t.offset(); //Get the height of the object var height = t.outerHeight(); //The position of the date selection box is attached The position of the object plus its height var newpos = { left: pos.left, top: pos.top height }; //The following are all dealing with window boundary issues var w = cp.width( ); var h = cp.height(); var bw = document.documentElement.clientWidth; var bh = document.documentElement.clientHeight; if ((newpos.left w) > ;= bw) { newpos.left = bw - w - 2; } if ((newpos.top h) >= bh) { newpos.top = pos.top - h - 2; } if (newpos.left < 0) { newpos.left = 10; } if (newpos.top < 0) { newpos.top = 10; } //Force the default to be the month date view $("#BBIT-DP-MP").hide(); newpos.visibility = "visible" ; cp.css(newpos); //Move to known position and display //cp.show(); $(this).attr("isshow", "1"); //Register a single click event to the document to solve the problem of hiding the date picker by clicking elsewhere after opening the date picker $(document).one("click", function(e) { me.attr("isshow", "0"); cp.removeData("ctarget").removeData("cpk").removeData("indata"); cp.css("visibility ", "hidden"); }); return false;//Organization bubbles } Some other codes are functions of date operations, such as last month and next month I won’t introduce it for a while. If you have any questions about the code, you can leave a message and I will answer it. Finally, there are examples. The first example is an honest demonstration Demo example. There are three types. Method, there is also a description of the calling method: http://jscs.cloudapp.net/ControlsSample/dpdemo The second example is the datepicker combined with the schedule management control I wrote Application (you can take a look at this first) http://xuanye.cloudapp.net/ The positions are:
is the application of datepicker in my creation. Finally, if you think this article is helpful to you, then click [Recommend]? Statement of this Website
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How to remove the height attribute of an element with jQuery? In front-end development, we often encounter the need to manipulate the height attributes of elements. Sometimes, we may need to dynamically change the height of an element, and sometimes we need to remove the height attribute of an element. This article will introduce how to use jQuery to remove the height attribute of an element and provide specific code examples. Before using jQuery to operate the height attribute, we first need to understand the height attribute in CSS. The height attribute is used to set the height of an element 
How to use PUT request method in jQuery?
Feb 28, 2024 pm 03:12 PM
How to use PUT request method in jQuery? In jQuery, the method of sending a PUT request is similar to sending other types of requests, but you need to pay attention to some details and parameter settings. PUT requests are typically used to update resources, such as updating data in a database or updating files on the server. The following is a specific code example using the PUT request method in jQuery. First, make sure you include the jQuery library file, then you can send a PUT request via: $.ajax({u 
jQuery Tips: Quickly modify the text of all a tags on the page
Feb 28, 2024 pm 09:06 PM
Title: jQuery Tips: Quickly modify the text of all a tags on the page In web development, we often need to modify and operate elements on the page. When using jQuery, sometimes you need to modify the text content of all a tags in the page at once, which can save time and energy. The following will introduce how to use jQuery to quickly modify the text of all a tags on the page, and give specific code examples. First, we need to introduce the jQuery library file and ensure that the following code is introduced into the page: < 
In-depth analysis: jQuery's advantages and disadvantages
Feb 27, 2024 pm 05:18 PM
jQuery is a fast, small, feature-rich JavaScript library widely used in front-end development. Since its release in 2006, jQuery has become one of the tools of choice for many developers, but in practical applications, it also has some advantages and disadvantages. This article will deeply analyze the advantages and disadvantages of jQuery and illustrate it with specific code examples. Advantages: 1. Concise syntax jQuery's syntax design is concise and clear, which can greatly improve the readability and writing efficiency of the code. for example, 
Use jQuery to modify the text content of all a tags
Feb 28, 2024 pm 05:42 PM
Title: Use jQuery to modify the text content of all a tags. jQuery is a popular JavaScript library that is widely used to handle DOM operations. In web development, we often encounter the need to modify the text content of the link tag (a tag) on the page. This article will explain how to use jQuery to achieve this goal, and provide specific code examples. First, we need to introduce the jQuery library into the page. Add the following code in the HTML file: 
How to tell if a jQuery element has a specific attribute?
Feb 29, 2024 am 09:03 AM
How to tell if a jQuery element has a specific attribute? When using jQuery to operate DOM elements, you often encounter situations where you need to determine whether an element has a specific attribute. In this case, we can easily implement this function with the help of the methods provided by jQuery. The following will introduce two commonly used methods to determine whether a jQuery element has specific attributes, and attach specific code examples. Method 1: Use the attr() method and typeof operator // to determine whether the element has a specific attribute 
Understand the role and application scenarios of eq in jQuery
Feb 28, 2024 pm 01:15 PM
jQuery is a popular JavaScript library that is widely used to handle DOM manipulation and event handling in web pages. In jQuery, the eq() method is used to select elements at a specified index position. The specific usage and application scenarios are as follows. In jQuery, the eq() method selects the element at a specified index position. Index positions start counting from 0, i.e. the index of the first element is 0, the index of the second element is 1, and so on. The syntax of the eq() method is as follows: $("s 
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