jquery selector Daquan

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

$ ("#myELement") select an element with an ID value equal to myelement, the ID value cannot be duplicated in the document only one ID value is myelement so get the unique element

$ ("div") selects all div tag elements and returns an array of DIV elements

$ (". MyClass") Select all elements of CSS that use the MyClass class

$ ("*") selects all the elements in the document and can be selected in a variety of ways: for example $ ("#myELement, Div,.myclass")

Cascade selector:

$ ("form input") selects all the input elements in the form element

$ ("#main > *") Select all child elements with an ID value of main

$ ("label + input") selects all of the next INPUT element nodes of the label element, and the test selector returns all input label elements that follow the label tag directly followed by an input tag

$ ("#prev ~ div") sibling selector, which returns all the div tags that belong to the same parent element for the 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 of the TR elements of the section 0,2,4 ... Element (Note: The sequence number starts at 0 because the selected number of elements is an array.)

$ ("tr:odd") Select all of the TR elements of the section 1,3,5 ... An element

$ ("Td:eq (2)") select the TD element with the number 2 in all TD elements

$ ("TD:GT (4)") Select all TD elements in the TD element with an ordinal greater than 4

$ ("Td:lt (4)") selects all TD elements in the TD element with an ordinal less than 4

$ (": Header") Select H1, H2, H3 and the like

$ ("div:animated") Select the element that is performing the animation effect

Content Filter Selector:

$ ("Div:contains (' John ')") Select all the elements in the div that contain the John text

$ ("Td:empty") Select all the arrays of TD elements that are empty (nor include text nodes)

$ ("Div:has (P)") Select all DIV elements that contain p tags

$ ("td:parent") Select all the element array with TD as parent node

Visual Filter Selector:

$ ("Div:hidden") Select all the hidden div elements

$ ("div:visible") Select all of the visual DIV elements

Attribute Filter Selector:

$ ("Div[id]") Select all DIV elements that contain the id attribute

$ ("input[name= ' newsletter ')" selects all the name attributes equal to the INPUT element of ' newsletter '

$ ("input[name!= ' newsletter ')" selects all the name attribute not equal to ' newsletter ' INPUT element

$ ("input[name^= ' News ')") Select all the name attributes to start with ' news ' INPUT element

$ ("input[name$= ' News ')") Select all the name attributes to end with ' news ' INPUT element

$ ("input[name*= ' Man ')") Select all the name attributes that contain the ' news ' INPUT element

$ ("input[id][name$= ' Man ')") can use multiple attributes for federated selection, which is to get all the elements that contain the id attribute and then the property 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 the child nodes that have only one child node in all Div

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 the checkbox input elements

$ (": Submit") Select all the submit input elements

$ (": Image") Select all the image input elements

$ (": Reset") Select all the reset input elements

$ (": Button") Select all the button input elements

$ (": File") Select all the file input elements

$ (": Hidden") Select all input elements of type hidden or hidden fields of the form

Form element Filter Selector:

$ (": Enabled") Select all the actionable form elements

$ (":d isabled") Select all the non-actionable form elements

$ (": Checked") Select all of the checked form elements

$ ("select Option:selected") selects all selected elements in the child element of the Select

Select the text value of the previous TD 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 terminated with "_r"

$ ("input[@ name ^= ' S_ ']"). Not ("[@ name $= ' _r ']")

A value that is selected by a radio named radio_01

$ ("input[@ name =radio_01][@checked]"). Val ();

$ ("a B") finds all child nodes under the a element, including non-direct child nodes

$ ("a>b") finds direct child nodes below the A element

$ ("a+b") finds sibling nodes behind a element, including non-direct child nodes

$ ("a~b") finds sibling nodes behind a element, excluding non-direct child nodes

1. $ ("a B") Find all child nodes under the a element, including non-direct child nodes

Example: Find all input elements in the form

HTML Code:

?

12345678910

<form><label>Name:</label><input name="name" /><fieldset> <label>Newsletter:</label> <input name="newsletter" /></fieldset></form><input name="none" /><span style=‘font-family: verdana, "courier new"; font-size: medium;‘ face="verdana, ‘courier new‘" size="4"><span style="line-height: 21px; font-size: 14px; white-space: normal;"></span></span>

JQuery Code:

$ ("form input")

Results:

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

2. $ ("a>b") Find the direct child node under the A element

Example: Match all the child input elements in the form.

HTML Code:

?

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<form><label>Name:</label><input name="name" /><fieldset> <label>Newsletter:</label> <input name="newsletter" /></fieldset></form><input name="none" /><span style=‘font-family: verdana, "courier new"; font-size: medium;‘ face="verdana, ‘courier new‘" size="4"><span style="line-height: 21px; font-size: 14px; white-space: normal;"></span></span>

JQuery Code:

$ ("form > Input")

Results:

[<input name= "name"/>]

3. $ ("a+b") find sibling nodes behind a element, including non-direct child nodes

Example: match all input elements following the label

HTML Code:

?

123456789

<form><label>Name:</label><input name="name" /><fieldset> <label>Newsletter:</label> <input name="newsletter" /></fieldset></form><input name="none" />

JQuery Code:

$ ("label + input")

Results:

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

4. $ ("a~b") find sibling nodes behind a element, excluding non-direct child nodes

Example: Find all input elements with form peers

HTML Code:

?

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<form><label>Name:</label><input name="name" /><fieldset> <label>Newsletter:</label> <input name="newsletter" /></fieldset></form><input name="none" /> <span style=‘font-family: verdana, "courier new"; font-size: medium;‘ face="verdana, ‘courier new‘" size="4"><span style="line-height: 21px; font-size: 14px; white-space: normal;"></span></span>

JQuery Code:

$ ("form ~ input")

Results:

[<input name= "None"/>]

jquery selector Daquan