Good programmer web front end training JavaScript learning notes -- jquery

Knowledge and action 2021-01-22 05:40:21
good programmer web end training


Good programmer web Front end training JavaScript Learning notes --jQuery Today, let's talk about some jQuery Something else

 Good programmer web Front end training JavaScript Learning notes --jQuery


Element operation


· Create an element

var div = $('<div></div>')

· Insert elements inside

// towards div Insert a p Elements , In the last $('div').append($('<p></p>'))?// hold p Element inserted into div In the middle , In the last $('<p>hello</p>').appendTo($('div'))?// towards div Insert a p Elements , Put it first $('div').prepend($('<p></p>'))?// hold p Element inserted into div In the middle , Put it first $('<p>hello</p>').prependTo($('div'))

· External insert element

// stay div Insert an element after p$('div').after($('<p></p>'))?// stay div Insert an element before p$('div').before($('<p></p>'))?// hold p Element inserted into div After element $('div').insertAfter($('<p></p>'))?// hold p Element inserted into div In front of the element $('div').insertBefore($('<p></p>'))

· Replacement elements

// hold div Replace the element with p Elements $('div').replaceWith($('<p></p>'))?// use p The element is replaced by div Elements $('<p></p>').replaceAll($('div'))

· Remove elements

// Delete all child nodes under the element $('div').empty()?// Remove yourself from the page $('div').remove()

· Clone elements

// Clone a li Elements // Take two parameters // Parameters 1: Do you want to copy your own events , The default is false// Parameters 2: Do you want to copy the events on all child nodes , The default is true$('li').clone()

Element size


· The width and height of the operation element

// obtain div The high position of the element content , It doesn't contain padding and border$('div').height()// Set up div The height of the content location is 200px$('div').height(200)?// obtain div The width of the element's content position , It doesn't contain padding and border$('div').width()// Set up div The width of the content location is 200px$('div').width(200)

· Get the built-in width and height of the element

// obtain div The high position of the element content , contain padding It doesn't contain border$('div').innerHeight()?// obtain div The width of the element's content position , contain padding It doesn't contain border$('div').innerWidth()

· Get the external width and height of the element

// obtain div The high position of the element content , contain padding and border$('div').outerHeight()// obtain div The high position of the element content , contain padding and border and margin$('div').outerHeight(true)?// obtain div The width of the element's content position , contain padding and border$('div').outerWidth()// obtain div The high position of the element content , contain padding and border and margin$('div').outerWidth(true)

Element location


· The position of the element relative to the page

// obtain div Position relative to the page $('div').offset() // What you get is an object { left: value , top: value }?// to div Set the position relative to the page $('div').offset({ left: 100, top: 100 })// Get positioned to a distance from the top left corner of the page 100 100 The location of

· The offset of an element from its parent

// obtain div The offset from the parent element ( The value of positioning )$('div').position()

· Get the height and width of the page

window.onscroll =function () {

// Get the height of the browser console.log($(window).scrollTop())}?window.onscroll =function () {

// Get the width of the browser scroll console.log($(window).scrollLeft())}

Elemental Events


· How to bind Events

// to button Button to bind a click event $('button').on('click', function () {

console.log(' I got clicked ')})?// to button Button to bind a click event , And carry parameters $('button').on('click', { name: 'Jack' }, function (e) {

console.log(e) // All the content is in the event object console.log(e.data) // { name: 'Jack' }})?// The way events are delegated to button Bind click event $('div').on('click', 'button', function () {

console.log(this) // button Button })?// The way events are delegated to button Bind click events and carry parameters $('div').on('click', 'button', { name: 'Jack' }, function (e) {

console.log(this) // button Button console.log(e.data)})

· Remove events

// to button The button is bound to a Click event , perform handler function $('button').on('click', handler)?// Remove events using off$('button').off('click', handler)

· Events that can only be executed once

// This event is bound again button On the button // Once executed, it will not be executed again $('button').one('click', handler)

· Direct trigger events

// When the code gets here , It will automatically trigger button Of click event $('button').trigger('click')

Common events that can be used directly


· The event that can be used directly is that it can not be used on To bind , Event methods that can be used directly

· click

// Direct to div Bind a click event $('div').click(function () {

console.log(' I got clicked ')})?// to div Bind a click event and pass parameters $('div').click({ name: 'Jack' }, function (e) {

console.log(e.data)})

· dblclick

// Direct to div Bind a double click event $('div').dblclick(function () {

console.log(' I got clicked ')})?// to div Bind a double-click event and pass parameters $('div').dblclick({ name: 'Jack' }, function (e) {

console.log(e.data)})

· scroll

// Direct to div Bind a scrolling event $('div').scroll(function () {

console.log(' I got clicked ')})?// to div Bind a scroll event and pass parameters $('div').scroll({ name: 'Jack' }, function (e) {

console.log(e.data)})

· hover

// This event contains two event handling functions // One is when you move in , One is triggered when moving out $('div').hover(function () {

console.log(' I'll trigger when I move in again ')}, function () {

console.log(' I'll trigger when I move out ')})

Animation


· show

// to div Bind a display animation $('div').show() // If the element itself is display none The status of can be displayed ?// to div Bind a display animation // Accept three parameters // $('div').show(' millisecond ', ' Speed ', ' Callback function ') $('div').show(1000, 'linear', function () {

console.log(' I'm done ')})

· hide

// to div Bind a hidden animation $('div').hide() // If the element itself is display block The state of being able to hide ?// to div Bind a display animation // Accept three parameters // $('div').show(' millisecond ', ' Speed ', ' Callback function ') $('div').hide(1000, 'linear', function () {

console.log(' I'm done hiding ')})

· toggle

// to div Bind a toggle animation $('div').hide() // The element itself is the display , Then hide , If it is hidden, it will be displayed ?// to div Bind a display animation // Accept three parameters // $('div').show(' millisecond ', ' Speed ', ' Callback function ') $('div').toggle(1000, 'linear', function () {

console.log(' The animation is finished ')})

· animate

// Define a custom animation $('.show').click(function () {

$('div').animate({

width: 500,

height: 300

}, 1000, 'linear', function () {

console.log(' The animation is over ')

})})

· stop

// Customize the animation now $('div').stop() // Just stop in the current state

· finish

// End the animation now $('div').finish() // Stop at the end of the animation
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