Karatasi ya Marejeleo ya jQuery
Marejeleo ya jQuery yanayoweza kutafutwa na kuchapishwa — viteuzi, udhibiti wa DOM, matukio, athari, kupitia, AJAX na visaidizi vya fomu. Bila malipo.
Selectors
14$('#id')
Select an element by its id
$('.class')
Select all elements with a class
$('div')
Select all elements of a tag name
$('*')
Select every element in the page
$('[name="email"]')
Select by an attribute value
$('a[href^="https"]')
Attribute starts-with selector
$('ul li:first')
First matched element
$('ul li:last')
Last matched element
$('tr:eq(2)')
Element at a zero-based index
$('li:not(.done)')
Exclude elements matching a selector
$(':checked')
All checked checkboxes/radios
$('div:visible')
Only currently visible elements
$('ul li')
Descendant combinator
$('ul > li')
Direct child combinator
Document ready & DOM
10$(function () { /* ... */ });
Run code once the DOM is ready
$(document).ready(fn)
Explicit document-ready handler
$(window).on('load', fn)
Run after all assets have loaded
$(this)
Wrap the current context element
$(el)
Wrap a raw DOM node in jQuery
$('<div class="box"></div>')
Create a new element from HTML
$('#box')[0]
Get the underlying DOM node
$('#box').get(0)
Get the DOM node via .get()
$('.item').length
Count the matched elements
$('#box').is(':visible')
Test a selector against the set
DOM manipulation
12$('#box').html('<b>Hi</b>')
Set the inner HTML
$('#box').text('Hello')
Set the text content (escaped)
$('#name').val('Ada')
Set a form field value
$('#list').append('<li>x</li>')
Insert content at the end
$('#list').prepend('<li>x</li>')
Insert content at the start
$('#box').before('<hr>')
Insert content before the element
$('#box').after('<hr>')
Insert content after the element
$('#box').remove()
Remove the element from the DOM
$('#box').empty()
Remove all child nodes
$('#box').clone()
Create a copy of the element
$('#box').wrap('<div>')
Wrap the element in new HTML
$('#box').replaceWith('<p>')
Replace the element entirely
Attributes & CSS
13$('#img').attr('src')
Get an attribute value
$('#img').attr('alt', 'Logo')
Set an attribute value
$('#cb').prop('checked')
Get a DOM property (checked/disabled)
$('#cb').prop('checked', true)
Set a DOM property
$('#img').removeAttr('title')
Remove an attribute
$('.box').addClass('active')
Add a CSS class
$('.box').removeClass('active')
Remove a CSS class
$('.box').toggleClass('open')
Toggle a CSS class on/off
$('.box').hasClass('active')
Test if a class is present
$('#box').css('color', 'red')
Set a single CSS property
$('#box').css({top: 0, left: 0})
Set multiple CSS properties
$('#box').width()
Get the computed width in pixels
$('#box').height()
Get the computed height in pixels
Events
12$('#btn').on('click', fn)
Attach an event handler
$('#btn').off('click')
Detach event handlers
$('#btn').click(fn)
Shorthand click handler
$('#form').submit(fn)
Handle form submission
$('#sel').change(fn)
Handle value changes
$('#in').keyup(fn)
Handle key-up in a field
$('#list').on('click', '.item', fn)
Delegated event for dynamic children
$('#btn').trigger('click')
Programmatically fire an event
$('#btn').one('click', fn)
Run a handler at most once
e.preventDefault()
Stop the default browser action
e.stopPropagation()
Stop the event from bubbling
e.target
The element that triggered the event
Effects & animation
12$('#box').show()
Display a hidden element
$('#box').hide()
Hide an element
$('#box').toggle()
Toggle visibility
$('#box').fadeIn(300)
Fade an element in
$('#box').fadeOut(300)
Fade an element out
$('#box').fadeTo(300, 0.5)
Fade to a given opacity
$('#box').slideUp()
Slide an element up (collapse)
$('#box').slideDown()
Slide an element down (expand)
$('#box').slideToggle()
Toggle a slide animation
$('#box').animate({left: 100})
Animate CSS properties
$('#box').stop()
Stop the current animation
$('#box').delay(500).fadeIn()
Delay the next queued effect
Traversing
12$('#box').find('.item')
Find descendants matching a selector
$('#box').parent()
Get the direct parent
$('#box').parents('.row')
Get all ancestors matching a selector
$('#box').closest('.row')
Nearest matching ancestor (or self)
$('#box').children()
Get the direct children
$('#box').siblings()
Get sibling elements
$('#box').next()
Get the next sibling
$('#box').prev()
Get the previous sibling
$('.item').each(fn)
Iterate over each matched element
$('.item').filter('.on')
Reduce the set by a selector
$('.item').first()
Reduce the set to the first element
$('.item').eq(1)
Reduce the set to one index
AJAX
11$.ajax({url: '/api', method: 'GET'})
Full-control AJAX request
$.get('/api', fn)
Shorthand HTTP GET request
$.post('/api', data, fn)
Shorthand HTTP POST request
$.getJSON('/api.json', fn)
GET request expecting JSON
$('#box').load('/part.html')
Load HTML into an element
$.ajax({dataType: 'json'})
Set the expected response type
$.ajax({data: {q: 'x'}})
Send request parameters
.done(function (res) {})
Run a callback on success
.fail(function (err) {})
Run a callback on failure
.always(function () {})
Run a callback after completion
$.ajaxSetup({headers: {}})
Set defaults for all requests
Forms
10$('#form').serialize()
Encode form data as a query string
$('#form').serializeArray()
Encode form data as an array
$('#name').val()
Read a field value
$('#name').val('Ada')
Write a field value
$(':input')
Select all form input elements
$('#cb').is(':checked')
Test if a checkbox is checked
$('#sel option:selected')
Get the selected option
$('#in').focus()
Move focus to a field
$('#form').on('submit', fn)
Handle the form submit event
$('#in').prop('disabled', true)
Disable a form control
Utilities
11$.each(arr, fn)
Iterate over an array or object
$.map(arr, fn)
Build a new array from each item
$.grep(arr, fn)
Filter an array by a predicate
$.extend({}, a, b)
Merge objects into a target
$.trim(' hi ')
Trim leading/trailing whitespace
$.inArray(2, arr)
Find an item index in an array
$.isArray(x)
Test whether a value is an array
$.isFunction(x)
Test whether a value is a function
$.parseJSON(str)
Parse a JSON string into an object
$.now()
Current timestamp in milliseconds
$.type(x)
Get the internal type of a value
Hakuna kipengele kinacholingana na “:q”.
Kuhusu Karatasi ya Marejeleo ya jQuery
Karatasi hii ya kumbukumbu ya jQuery ni kumbukumbu fupi ya maktaba inayoendesha bado sehemu kubwa ya tovuti zilizopo: vichaguzi (selectors), document ready na misingi ya DOM, uchakataji wa DOM, sifa (attributes) na CSS, matukio, athari na uhuishaji, upitiaji (traversing), AJAX, fomu, na huduma za jumla (utilities).
Ikiwa unadumisha front-end za zamani, plugins au themu za CMS za zamani, ufahamu wa jQuery bado ni ujuzi wa vitendo. Kila safu mlalo inaoanisha wito wa method na maelezo ya mstari mmoja, ili uweze kukumbuka muundo hasa kwa ajili ya utoaji wa event delegation, upitiaji wa mnyororo, au ombi la AJAX bila kupekua nyaraka za zamani.
Karatasi ni bure na inafanya kazi kikamilifu upande wa kifaa chako. Chuja methods papo hapo kwa sanduku la utafutaji, ruka kati ya sehemu kupitia orodha ya yaliyomo inayoning'inia, nakili kipande chochote kwa mbofyo mmoja na chapisha ukurasa unapokuwa katikati ya urekebishaji wa msimbo wa zamani.
Jinsi ya kutumia Karatasi ya Marejeleo ya jQuery
- Pitia sehemu, kuanzia Vichaguzi na Document ready na DOM hadi Upitiaji na AJAX na Huduma za jumla.
- Tafuta method kama on, closest au ajax ili kuchuja karatasi papo hapo.
- Ruka hadi sehemu kama Athari na uhuishaji kupitia upau wa pembeni unaoning'inia.
- Bofya kipande au ikoni yake ya kunakili ili kunakili wito wa jQuery kwenye msimbo wako.
- Chapisha karatasi kwa ajili ya kumbukumbu ya nje ya mtandao unapofanya kazi kwenye miradi ya zamani.
Maswali yanayoulizwa mara kwa mara
Sehemu kumi: vichaguzi, document ready na misingi ya DOM, uchakataji wa DOM, sifa na CSS, matukio, athari na uhuishaji, upitiaji, AJAX, fomu, na huduma za msaada za jumla.
Kwa miradi mipya timu nyingi zinatumia vanilla JavaScript, lakini kiasi kikubwa cha msimbo wa uzalishaji, plugins na themu za CMS bado zinaendesha jQuery — karatasi hii inalenga kudumisha na kuhamisha msimbo huo kwa ujasiri.
Ndiyo. Sehemu ya matukio inajumuisha aina ya delegated ya .on() pamoja na kuunganisha, kuondoa uunganisho na kuchochea — mfumo unaohitajika zaidi unapofanya kazi na vipengele vilivyoingizwa kwa njia ya kimuundo.
Ndiyo. Bofya kipande chochote, au ikoni ya kunakili kwenye safu mlalo yake, na wito hunakiliwa kwenye clipboard yako tayari kubandikwa.
Ndiyo, ni bure kabisa — inayoweza kutafutwa, kuchapishwa na inaonyeshwa kwenye kivinjari chako bila kujisajili.
Utafutaji maarufu
jquery cheat sheet
jquery selectors
jquery ajax syntax
jquery event methods
jquery dom manipulation
jquery effects and animation
jquery traversing methods
jquery reference
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