Usage of jQuery Selector

JQuery selectors can be divided into basic selectors, hierarchical selectors, filter selectors, and form selectors. Filter selectors can be divided into: simple filter selector, content filter selector, visibility filter selector, attribute filter selector, child element filter selector, and form object attribute filter selector. Selector is the most basic of jQuery. below

JQuery selectors can be divided into basic selectors, hierarchical selectors, filter selectors, and form selectors. Filter selectors can be divided into: simple filter selector, content filter selector, visibility filter selector, attribute filter selector, child element filter selector, and form object attribute filter selector. Selector is the most basic of jQuery. Next we will introduce the usage of jquery selector.

In jquery, selectors are divided into the following types:

Basic Selector

1. id selector (specify the id element)

Set the background color of the element id = "one" to black. (Id selector returns a single element)

$ (Document). ready (function (){
Certificate ('0000one'0000.css ('background', '#000 ');
});
2. class selector (traversing css class elements)

Sets the background color of the element to black.

$ (Document). ready (function (){
Certificate ('.cube'0000.css ('background ',' #000 ');
});
3. element selector (traversing html elements)

Set the text size of the p element to 12px.

$ (Document). ready (function (){
(('P'0000.css ('font-size', '12px ');
});
4. * selector (traversing all elements)
$ (Document). ready (function (){
// Traverse all elements in the form and set the font color to red
$ ('Form * '0000.css ('color', '# ff0000 ');
});
5. Parallel Selector
$ (Document). ready (function (){
// Set the margin of the p and div elements to 0.
$ ('P, div'0000.css ('margin ', '0 ');
});

Cascade selector:

$ ("Form input") Select the input element from all form elements

$ ("# Main> *") select all child elements whose id is main.

$ ("Label + input") Select the next input element node of all label elements. The result returned by the test selector is that the label is directly followed by all input tag elements of an input tag.

$ ("# Prev ~ Div ") compatriot selector, which returns all div tags of the Tag Element with id as prev that belongs to the same parent element.

 

Filter Selector

 

Basic filter selector:

$ ("Tr: first") Select the first element of all tr

$ ("Tr: last") Select the last one of all tr Elements

$ ("Input: not (: checked) + span") filters out all input elements of the checked selector.

$ ("Tr: even") Select the 0, 2, 4 ...... (Note: Because the selected multiple elements are arrays, the serial number starts from 0)

$ ("Tr: odd") select elements 1, 3, 5... of all tr elements.

$ ("Td: eq (2)") Select the td element whose Sn is 2 from all td elements.

$ ("Td: gt (4)") Select All td elements whose serial number is greater than 4 in the td Element

$ ("Td: ll (4)") Select All td elements whose serial number is less than 4 in the td Element

Content Filter selector:

$ ("Div: contains ('john')") select all elements whose div contains John text.

$ ("Td: empty") Select an array of all td elements that are empty (or contain text nodes)

$ ("Div: has (p)") Select All div elements containing the p tag

$ ("Td: parent") Select All element arrays with td as the parent node

Visual filter selector:

$ ("Div: hidden") select all the div elements to be hidden.

$ ("Div: visible") Select All visualized div elements

Attribute filter selector:

$ ("Div [id]") Select All div elements containing the id attribute

$ ("Input [name = 'newsletter ']") Select the input element whose name attribute is equal to 'newsletter'.

$ ("Input [name! = 'Newsletter'] ") Select the input element whose name attribute is not equal to 'newsletter '.

$ ("Input [name ^ = 'News']") select all input elements whose name attributes start with 'News '.

$ ("Input [name $ = 'News']") select all input elements whose name attributes end with 'News '.

$ ("Input [name * = 'man']") select all input elements whose name attribute contains 'new '.

$ ("Input [id] [name $ = 'man']") multiple attributes can be used for joint selection, this selector is used to obtain all elements that contain the id attribute and end with man.

Child element filter selector:

$ ("Div span: first-child") returns the array of the first subnode of all div elements.

$ ("Div span: last-child") returns the array of the last node of all div elements.

$ ("Div button: only-child") returns an array of all child nodes with only one subnode in all Divs.

Form element selector:

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

$ (": Text") select all text input Elements

$ (": Password") select all password input Elements

$ (": Radio") select all radio input Elements

$ (": Checkbox") select all the 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 of the hidden type.

Form element filter selector:

$ (": Enabled") Select All operable form elements

$ (": Disabled") Select All unoperable form elements

$ (": Checked") select all checked form elements

$ ("Select option: selected") select the selected element from all select sub-elements.