Jquery filter elements (1) and jquery filter elements

Jquery filter elements (1) and jquery filter elements

. Eq ()
Reduce the set of matching elements to the element of the specified index.
. Eq (index)
Index is an integer that indicates the position of an element, based on 0.
$ ("Li" ).eq(2).css ('background-color', 'red ')
// Select the third element to change the background to red.
. Eq (-index)
-Index is an integer that indicates the position of an element and starts from the last element in the set.
$ ("Li" ).eq(-2).css ('background-color', 'red ')
// Select the second to last element and change the background to red.

. Filter ()
Filter the matching expressions in the element set or the element set tested by the function.
. Filter (selector)
A selector string used to match elements.
$ ('Lil'). filter (': even'background .css ('background-color', 'red ');
// Turns the background of the element with an odd number of rows into red.
. Filter (function (index ));
Function (index)
A function is used to test each element in the set. This is the current DOM element.
$ ("Li"). filter (function (index ){
Return index % 3 = 2;
Background .css ('background-color', 'red ');
Change the multiples of the third and sixth three to red.
. Filter (element)
One or more DOM elements match the current element set.
$ ("Div"). filter (". mddle" ).css ("border-color", "red ");
Obtain the element that contains the. middle selector in the div and convert the background to red.
. Filter (jQuery object)

JQuery object type: object
Used to further filter the current element set.
$ ("Div"). filter (function (index ){
Return index = 1 | $ (this). attr ("id") = "fourth ";
}).Css ("border", "3px double red ")
Obtain the element in the div that contains an index value equal to 1 or the id selector is fourth, and change it to a border.

 

. First ()
Obtain the first element in the matched element set.
This method does not accept any parameters.
$ ("Li" ).first().css ("background-color", 'red ');
// Find the first element in li and change the background color to red.

. Has ()
Filter those that match the element set with matched selectors or DoM elements.
. Has (selector)
Selector: a selector string used to match elements.
. Has (contained)
Contained is used to match the DOM element of an element.
Certificate ('li'background .has('ul'background .css ('background', 'red ');
Filter out the elements containing ul in li.
. Is ()
Determines whether the element set that is currently matched is a selector, DOM element, or jQ object. If there is a match, true is returned.
. Is (selector)
A string that contains a selector expression used to match elements.
. Is (function (index ))
A function is used to test the index position of the element... index in the set. This indicates the current element.
. Is (jQuery object)
Existing element to match the current element.
. Is (element)
Element is a DOM element Used for matching.
$ ("Input [type = 'checkbox']"). parent (). is ("form ");
Determines whether the parent level of an element whose form type is checkbox is 'form'. If yes, true is returned, or false is returned.
. Last ()
Obtain the last matching element.
This method does not accept any parameters.
$ ("Li" ).last().css ("background-color", 'red ');
// Find the last element in li and change the background color to red.
. Map ()
Use a function to match every element in the current set. Generates a new object.
. Map (callback (index, domElemnt ))
Callback (index, domElemnt)
A function object.
$ ('Input'). map (function (){
Return $ (this). val ();
}) Obtain each value in the input set.
. Not ()
Removes the specified element from the matched element set.
. Not (selector)
Selector a selector used to match elements.
Certificate ('li'0000.not(('.notli'00000000.css ('background-color', red );
The background color except with the. notli selector is set to red.
. Not (elements)
One or more DOM elements to be removed from the element set.
$ ('Lil'). not (': event'background .css ('background-color', 'red ')
Items 2 and 4 in the list are red. Because the selector does not match.
$ ('P'). not ($ ("div p. selected "))
Remove the element that meets "div p. selected" from the section set.
. Not (function (index ))
Unction a function is used to test each element in the set. this refers to the current DOM element.
. Slice ()
Filters Matching Element Sets Based on the specified subscript range to generate an object.
. Slice (start [, end])
Start is an integer that starts counting from 0. Start subscript. If it is a negative number, it can start from the end.
End: an integer that starts counting from 0. End the subscript, if not written until the end.
Certificate ('li'mirror.slice(2).css ('background-color', 'red ')
From the third in the Set, the background is all white.
$ ('Lil'). slice (2, 42.16.css ('background-color', 'red ');
The background of the third and fourth items in the list is set to red.