Introduction to wildcard usage in the selector of jquery _jquery

1. Selector
(1) wildcard characters:

Copy Code code as follows:

$ ("input[id^= ' Code ']");//id all input tags starting with code
$ ("input[id$= ' Code ']");//id all input tags that end with the code
$ ("input[id*= ' Code ']");//id property contains all input labels for code

(2) According to the index selection

Copy Code code as follows:

$ ("tbody Tr:even"); Select all TR tags with an even-numbered index
$ ("tbody tr:odd"); Select all TR tags with an odd index

(3) To obtain the number of input for the next level node of Jqueryobj

Copy Code code as follows:

Jqueryobj.children ("input"). Length;

(4) Get all <a> tags under the child node of the label with class main

Copy Code code as follows:

$ (". Main > a");

(5) Select adjacent label

Copy Code code as follows:

Jqueryobj.next ("div");//Get the jqueryobj tag immediately after a div,nextall fetch all

2. Filters

Copy Code code as follows:

Not
$ ("#code input:not ([id^= ' Code '])"//id for all input tags within the code tag that do not contain IDs starting with code

3. The event

Copy Code code as follows:

Working with keyboard actions on a text box
Jqueryobj.keyup (function (event) {
var keycode = event.which;//Gets the key value that is currently pressed on the keyboard, enter 13
}

4. Tool function

Copy Code code as follows:

$ (' #someField '). Val ($ (' #someField '). Val ());//Eliminate spaces, Syntax: $.trim (value)