jQuery study notes control page implementation code_jquery
each() traverses elements (k1)
$(document).ready(function () {
$("#btn").html("each() traverses elements").click(function (event) {
$( "div").each(function (index) {
$(this).html("This is the "index "div");
});
event.preventDefault();
});
});
Get the value of the attribute (k1) attr(name)
$(document).ready(function () {
$("#btn").html("Get attribute value"). click(function (event) {
$("div").each(function () {
alert("The value of the title attribute is:" $(this).attr("title"));
});
event.preventDefault();
});
});
Set the value of the attribute (k1) attr(name,value), attr (name,fn)
eg1
$(document ).ready(function () {
$("div").each(function () {
$(this).html(this.title);
});
$( "#btn").html("Set attribute value").click(function (event) {
$("div").each(function () {
$(this).attr("style ", "color:Red");
});
event.preventDefault();
});
});
eg2
$(document).ready(function () {
$( "div").each(function () {
$(this).html(this.title);
});
$("#btn").html("Set attribute value" ).click(function (event) {
$("div").each(function (index) {
$(this).attr("id", function () {
return "div -id" index;
}).html($(this).attr("id"));
});
event.preventDefault();
});
});
Remove attribute (k1) removeAttr(name)
Set element style
addClass(names), removeClass(names), toggleClass(names)
$(document).ready(function () {
$ ("div").each(function () {
$(this).html(this.title).addClass("myClass1").mouseover(function () {
$(this).toggleClass( "myClass2");
});
});
});
Get it directly and set the style (k1) css(name), css(name,value )
$(document).ready(function () {
$("div").each(function () {
$(this).html(this.title).css({ color: "Red", opacity: "0.5" }).mouseover( function () {
$(this).css("opacity", "1.0");
}).mouseout(function () {
$(this).css("opacity", " 0.5");
});
});
});
Judge css type hasClass(name) is(name)
Process the elements of the page
text() gets the plain text content html () gets the innerHTML attributes including innerHTML
Move and copy elements (k2) append(), appendTo(target) has two forms: copy and move , single target movement, multiple target copy
$(document ).ready(function () {
$("p").append($("a:eq(0)"));
$("p:eq(1)").append( $("a:eq(1)"));
});
Add nodes: before(), insertBefore(), after(), insertAfter()
Yes Add elements directly before or after the node, instead of inserting them as child elements. There are two forms of copying and moving, single target movement, multiple target copy
Delete element (k2)
eg1: remove()
$(function () {
$(" p").remove(":contains(P)");// Equivalent to $("p:contains("P")").remove();
});
eg2: empty() Note: There is a difference between empty() and remove(). empty() deletes all its child elements
$(function () {
$("p").css({border:"1px solid #FF0000",height:"20px"} ).empty();
});
Clone elements to solve the problem of copying and moving (k3)
$(function () {
$("#btn-k3").html("clone() clone yourself and clone Event").click(function () {
//Clone yourself and clone the click event (set to true)
$(this).clone(true).insertAfter(this);
}) ;
});
Processing the value of the form element (k4) val()
$(function () {
$("input[type=button]").click(function () {
var sValue = $( this).val();
$("input[type=text]").val(sValue);
});
});
Processing page Event
Bind event listener (k5) bind(eventType,[data],Listener), eventTypeName(fn), one(eventType,Listener)
$(function () {
for (var i = 0; i $( "div:last").clone(true).insertAfter($("div:last"));
};
$("div").one("click", function () {
$(this).addClass("myClass1").html("Can only be clicked once");
});
});
Delete event (k5) unbind(), unbind("click"), unbind("click",myFunc)
$(function () {
$("div").clone().html("unbind() delete event").click(function () {
$(" div").unbind();
}).insertAfter($("div"));
$("div:first").click(function () {
alert("Not deleted Event");
});
});
/*Properties and methods of jQuery event object
altKey If the Alt key is pressed, it is true, otherwise it is false
ctrlKey If Ctrl is pressed, it will be true, otherwise it will be false
keyCode For keyup and keydown events, return the value of the key ("A" and "a" have the same value, which is 65)
page.X,page .Y The coordinates of the mouse pointer on the client, excluding toolbars and scroll bars, etc.
relatedTarget The element that the mouse pointer enters or leaves in the mouse event
screenX, screenY The coordinate value of the mouse pointer relative to the entire computer screen
shiftKey is true when the shift key is pressed, false otherwise
target the element/object that caused the event
type the name of the event
which is the Unicode value of the key in keyboard events, and represents the value of the key in mouse events (1 is the left button, 2 is the middle button, and 3 is the right button)
stopPropagation() prevents the event from bubbling upwards
preventDefault() prevents the default behavior of the event
*/
automatically triggers the event (k5 ) trigger(eventType)
$(function () {
$("div").click(function () {
alert("click event");
});
$(".myClass3").trigger("click") ;
});
Implementing dynamic alternation of click events (k6) toggle(fn,fn)
$(function () {
$("img").attr("title","toggle() to implement click event Dynamic alternation").toggle(function (event) {
$(event.target).attr("src", "Img/Img2.jpg");
},
function (event) {
$(event.target).attr("src", "Img/Img1.jpg");
});
});
Implementing sensor mouse (k6)
$(function () {
$("img").hover(function (event) {
$(event.target).css("opacity", "1.0");
},
function (event) {
$(event.target).css("opacity", "0.5");
}
);
});
html code
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
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
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)
Hot Topics
What should I do if I encounter garbled code printing for front-end thermal paper receipts?
Apr 04, 2025 pm 02:42 PM
Frequently Asked Questions and Solutions for Front-end Thermal Paper Ticket Printing In Front-end Development, Ticket Printing is a common requirement. However, many developers are implementing...
Demystifying JavaScript: What It Does and Why It Matters
Apr 09, 2025 am 12:07 AM
JavaScript is the cornerstone of modern web development, and its main functions include event-driven programming, dynamic content generation and asynchronous programming. 1) Event-driven programming allows web pages to change dynamically according to user operations. 2) Dynamic content generation allows page content to be adjusted according to conditions. 3) Asynchronous programming ensures that the user interface is not blocked. JavaScript is widely used in web interaction, single-page application and server-side development, greatly improving the flexibility of user experience and cross-platform development.
Who gets paid more Python or JavaScript?
Apr 04, 2025 am 12:09 AM
There is no absolute salary for Python and JavaScript developers, depending on skills and industry needs. 1. Python may be paid more in data science and machine learning. 2. JavaScript has great demand in front-end and full-stack development, and its salary is also considerable. 3. Influencing factors include experience, geographical location, company size and specific skills.
How to merge array elements with the same ID into one object using JavaScript?
Apr 04, 2025 pm 05:09 PM
How to merge array elements with the same ID into one object in JavaScript? When processing data, we often encounter the need to have the same ID...
Is JavaScript hard to learn?
Apr 03, 2025 am 12:20 AM
Learning JavaScript is not difficult, but it is challenging. 1) Understand basic concepts such as variables, data types, functions, etc. 2) Master asynchronous programming and implement it through event loops. 3) Use DOM operations and Promise to handle asynchronous requests. 4) Avoid common mistakes and use debugging techniques. 5) Optimize performance and follow best practices.
How to achieve parallax scrolling and element animation effects, like Shiseido's official website?
or:
How can we achieve the animation effect accompanied by page scrolling like Shiseido's official website?
Apr 04, 2025 pm 05:36 PM
Discussion on the realization of parallax scrolling and element animation effects in this article will explore how to achieve similar to Shiseido official website (https://www.shiseido.co.jp/sb/wonderland/)...
The difference in console.log output result: Why are the two calls different?
Apr 04, 2025 pm 05:12 PM
In-depth discussion of the root causes of the difference in console.log output. This article will analyze the differences in the output results of console.log function in a piece of code and explain the reasons behind it. �...
How to implement panel drag and drop adjustment function similar to VSCode in front-end development?
Apr 04, 2025 pm 02:06 PM
Explore the implementation of panel drag and drop adjustment function similar to VSCode in the front-end. In front-end development, how to implement VSCode similar to VSCode...
