jquery Hierarchy Selector Usage instructions

1.find (): Finds the child element of the element and the grandson element (and all descendant elements).

$ (' #box '). Find (' P '). CSS (' colour ', ' white ');//id for all P labels under box
2.children (): found the child element of the element.

$ (' #box '). Children (' P '). CSS (' Color ', ' white ');//id for all child elements of box.

3.next (): Finds the next element of the same level element of the element.

$ (' #box '). Next (' P '). css (' font-size ', ' 26px ');//will be set to 26px with the next P label font at the same level as ID box, if the next primary color is not a P tag, it has no effect
$ (' #box '). Next (). CSS (' font-size ', ' 26px ');//will be set to 26px with the next label font at the same level as ID box
4.nextAll (): Find all elements that are eligible after the same level as the element.

$ (' #box '). Nextall (' P '). CSS (' Color ', ' red ');//will be set to red with all subsequent p labels at the id=box level
$ (' #box '). Nextall (). CSS (' Color ', ' red ');//will be set to red with all the primary colors after the Id=box same level
5.prev (), Prevall () and above 3, 4 are just the difference between the front and the rear.

6.siblings (): All the sibling elements.

$ (' #box '). Siblings (' P '). CSS (' color ', ' green ');//id=box all the sibling elements for P tags are set to green
$ (' #box '). Siblings (). CSS (' color ', ' green ');//id=box all sibling elements are set to green

7.nextUntil (): Search down until an element is encountered to stop the assignment action.

$ (' #box '). Nextuntil (' P '). CSS (' color ', ' orange ');//give Id=box the downward sibling element color to orange until you meet

The JQuery selector is incredibly powerful, and here's a quick summary of common element lookup methods

$ ("#myELement") select an element with an ID value equal to MyElement, and the ID value cannot be repeated in the document only one ID value is myelement so the unique element is obtained
$ ("div") selects all div tag elements, returns an array of DIV elements
$ (". MyClass") Select all elements of a CSS that uses the MyClass class
$ ("*") Select all the elements in the document, and you can use a variety of options for joint selection: for example $ ("#myELement, Div,.myclass")

Cascade selector:
$ ("Form input") select the INPUT element in all form elements
$ ("#main > *") Select all child elements of the ID value of main
$ ("label + input") selects the next INPUT element node for all the label elements, and the test selector returns all input label elements immediately following the label label with an input label
$ ("#prev ~ div") sibling selector, which returns all the div tags that belong to the same parent element for a LABEL element with ID prev

Basic Filter Selector:
$ ("Tr:first") selects the first of all TR elements
$ ("Tr:last") selects the last of all TR elements
$ ("Input:not (: Checked) + span")

Filter out: All input elements of the checked selector

$ ("Tr:even") Select all TR elements of the 0,2,4 ... Element (Note: Since the selected element is an array, the ordinal number is starting at 0)

$ ("tr:odd") Select all TR elements of the 1,3,5 ... An element
$ ("Td:eq (2)") select the TD element with the serial number 2 in all TD elements
$ ("TD:GT (4)") Select all TD elements with serial number greater than 4 in TD elements
$ ("Td:ll (4)") Select all TD elements with a serial number less than 4 in the TD element
$ (": Header")
$ ("div:animated")
Content Filter Selector:

$ ("Div:contains (' John ')") Select elements in all div that contain John text
$ ("Td:empty") selects all arrays of TD elements that are empty (and not including text nodes)
$ ("Div:has (P)") Select all DIV elements that contain p tags
$ ("td:parent") Select all array of elements with TD as parent node
Visual Filter Selector:

$ ("Div:hidden") Select all the hidden div elements
$ ("div:visible") Select all the visual div elements
Attribute Filter Selector:

$ ("Div[id]") Select all DIV elements that contain ID attributes
$ ("input[name= ' newsletter ']") selects all input elements that have the Name property equal to ' newsletter '

$ ("input[name!= ' newsletter ']") selects all input elements that are not equal to ' newsletter ' for all name properties

$ ("input[name^= ' News") selects all the input elements with the name attribute beginning with ' News '
$ ("input[name$= ' News '") Select all the input elements with the name attribute ending with ' news '
$ ("input[name*= ' Man ']") Select all the name attributes containing the ' news ' INPUT element

$ ("input[id][name$= ' man ')" can use multiple properties for joint selection, which is to get all the elements that contain the id attribute and then the attribute ends with a man

child element Filter Selector:

$ ("UL Li:nth-child (2)"), $ ("ul Li:nth-child (Odd)"), $ ("ul Li:nth-child (3n + 1)")

$ ("div span:first-child") returns an array of the first child nodes of all DIV elements
$ ("div span:last-child") returns an array of the last nodes of all DIV elements
$ ("div button:only-child") returns an array of all child nodes in all div with only one child node

Form element selector:

$ (": Input") Select all form input elements, including input, textarea, select and button

$ (": Text") Select all text input elements
$ (":p assword") Select all password input elements
$ (": Radio") Select all radio input elements
$ (": CheckBox") Select all checkbox input elements
$ (": Submit") Select all submit input elements
$ (": Image") Select all image input elements
$ (": Reset") Select all reset input elements
$ (": Button") Select All button input elements
$ (": File") Select all file input elements
$ (": Hidden") Select the hidden fields of all input elements or forms that are of type hidden

Form element Filter Selector:

$ (": Enabled") Select all operable form elements
$ (":d isabled") Select all of the form elements that are not operable
$ (": Checked") Select all of the checked form elements
$ ("Select Option:selected") Select the element to be selected in the child elements of all Select



Select the last TD's text value for the input text box named "S_03_22″"
$ ("input[@ name =s_03_22]"). Parent (). Prev (). Text ()

The name begins with "S_" and is not end with "_r"
$ ("input[@ name ^= ' S_ ']"). Not ("[@ name $= ' _r ']")

A value selected by a radio named radio_01
$ ("input[@ name =radio_01][@checked]"). Val ();





$ ("A B") finds all child nodes under a element, including non-direct child nodes
$ ("a>b") looking for a direct child node under the A element
$ ("a+b") finds sibling nodes behind a element, including indirect child nodes
$ ("a~b") finds sibling nodes behind a element, excluding indirect child nodes

1. $ ("A B") Look for all child nodes under a element, including non-direct child nodes

Example: Find all input elements in a form

HTML Code:

The code is as follows	Copy Code
<form> <label>Name:</label> <input name= "Name"/> <fieldset> <label>Newsletter:</label> <input name= "Newsletter"/> </fieldset> </form> <input name= "None"/>

JQuery Code:

$ ("form input")
Results:

[<input name= "name"/>, <input name= "newsletter"/>]

2. $ ("a>b") Find the direct child node below the A element
Example: matches all the child input elements in the form.