JQuery selectors and filters organized_jquery

After a night of searching and sorting, I finally came up with what should be considered the most comprehensive set of JQuery filter selection methods. All code is tested.

First HTML code

Copy code The code is as follows:

HTML Code

        
        
       


        
        
        


        
        
        

	​ ​
option1 option2 option3

Hello world!

JS code

1.DOM object and JQuery packaging set

1. What you get through document.getElementById(), document.getElementsByName(), etc. is the DOM object or DOM object set. The former gets the object, and the latter gets the DOM object set

Copy code The code is as follows:

var text11_dom=document.getElementById("text11");
var text11_dom=document.getElementsByName("text11")[0];
var text11_dom=document.all.text11;//Here text11 can be either a name value or an id value
var text11_dom=document.all[10];

2. If you want to use the functions provided by JQuery, you must first construct a JQuery packaging set. What is returned through $() is the JQuery packaging set.

Copy code The code is as follows:

var text11_jquery=$("#text11");

2. Convert JQuery packaging set and DOM object to each other

1. DOM objects cannot use JQuery attribute methods, but DOM objects can be converted into JQuery wrapper sets through $()

Copy code The code is as follows:

var text11_dom=document.getElementById("text11");
var text11_jquery=$(text11_dom);

2. The JQuery wrapper set can use the attribute methods of some DOM objects such as .length, but there are also some attribute methods that cannot be used such as .value. You can obtain the corresponding DOM object by adding square brackets and the index value after the JQuery wrapper set

Copy code The code is as follows:

var text11_dom=$("#text11")[0];

3. This is also a DOM object during each loop or when an event is triggered

Copy code The code is as follows:

$("#text11").click(function(){
var text11_dom_value=this.value;
alert(text11_dom_value);
});

3. The $ symbol represents a reference to the JQuery object in JQuery. There are four core methods of JQuery

1.jQuery(html[,ownerDocument]): Dynamically create Dom elements based on HTML original strings

Copy code The code is as follows:

$("

Hello!

").appendTo("body");

2.jQuery ( elements ): Encapsulate one or more Dom objects into jQuery packaging sets, which is the conversion between the above DOM objects and JQuery packaging sets

3.jQuery( callback ): shorthand for $(document).ready()

Copy code The code is as follows:

$(function(){
alert("Hello!");
});

4.JQuery(selector[,context]): Search for JQuery packaging sets that meet the conditions within the specified range. Context is the search range. Context can be a DOM object set or a JQuery packaging set
Find JQuery wrapper set
for element with id text11 in all tr ​​tags

Copy code The code is as follows:

var text11_query=$("#text11","tr");

===================jQuery selector===================

1. Basics selector Basics

1. Select based on tag name

Copy code The code is as follows:

var input_query=$("input");

2. Select
based on id value

Copy code The code is as follows:

var text11_query=$("#text11");

3. Select based on class value

Copy code The code is as follows:

var text11_query=$(".text11");

4. Select multiple JQuery packaging sets that meet the conditions at the same time. Use , to separate the conditions

Copy code The code is as follows:

var text_query=$("#text11,.text12");

5. Select all DOM elements

Copy code The code is as follows:

var all_query=$("*");

2. Hierarchy

1. Get all elements with the id value text11 below them from all tr ​​tags

Copy code The code is as follows:

var text11_query=$("tr #text11");

2. Get all direct input sub-elements
under all td tags

Copy code The code is as follows:

var input_query=$("td>input");

3. Get the class button11 element behind the element with id text11, and only get one element that meets the conditions. text11 and button11 are at the same level

Copy code The code is as follows:

var button11_query=$("#text11 .button11");

4. Get all elements with class button11 behind the element with id text11

Copy code The code is as follows:

var button11_query=$("#text11~.button11");

3. Basic Filters

1. Get the first input element

Copy code The code is as follows:

var input_query=$("input:first");

2. Get the last input element

Copy code The code is as follows:

var input_query=$("input:last");

3. Get all unselected input elements

Copy code The code is as follows:

var input_query=$("input:not(:checked)");

4. Count the first input element as one and find all odd-numbered input elements

Copy code The code is as follows:

var input_query=$("input:even");

5. Starting from the second input, find all even-numbered input elements

Copy code The code is as follows:

var input_query=$("input:odd");

6. Find the input element with index 1, and the index value starts from 0

Copy code The code is as follows:

var input_query=$("input:eq(1)");

7. Find all input elements with index greater than 0

Copy code The code is as follows:

var input_query=$("input:gt(0)");

8. Find all input elements with index less than 2

Copy code The code is as follows:

var input_query=$("input:lt(2)");

9. Get alltitle elements
on the page

Copy code The code is as follows:

var h_query=$(":header");

10. Get all elements that are executing animation effects

Copy code The code is as follows:

var animated_query=$(":animated");

4. Content Filters

1. Find all h1 elements containing "Hello World!" in all html content

Copy code The code is as follows:

var h1_query=$("h1:contains('Hello world!')");

2. Get all td elements
that do not contain sub-tags or have empty html content

Copy code The code is as follows:

var td_query=$("td:empty");

3. Find all td elements containing input sub-elements

Copy code The code is as follows:

var td_query=$("td:has(input)");

4. Find all td elements that contain sub-tags or have html content

Copy code The code is as follows:

var td_query=$("td:parent");

5. Visibility Filters Visibility Filters

1. Find all hidden input elements

Copy code The code is as follows:

var input_query=$("input:hidden");

2. Find all visible input elements

Copy code The code is as follows:

var input_query=$("input:visible");

6. Attribute Filters
1. Find all input elements containing the id attribute

Copy code The code is as follows:

var input_query=$("input[id]");

2. Find the input element whose name value is text11

Copy code The code is as follows:

var input_query=$("input[name='text11']");

3. Find all input elements whose name value is not equal to text11

Copy code The code is as follows:

var input_query=$("input[name!='text11']");

4. Find the input element whose name value starts with text

Copy code The code is as follows:

var input_query=$("input[name^='text']");

5. Find all input elements whose name value ends with 11

Copy code The code is as follows:

var input_query=$("input[name$='11']");

6. Find all input elements whose name value contains ext

Copy code The code is as follows:

var input_query=$("input[name*='ext']");

7. Find all input elements that contain the id attribute and the name value contains ext

Copy code The code is as follows:

var input_query=$("input[id][name*='ext']");

7. Child Filters

1. Find all input elements ranked second among all child elements in the parent element
The parameter in nth-child() is optional, even counts as an even number here, and odd counts as an odd number here. Any number of n means that all input elements with parent elements are selected. The number directly selects the input element ranked first. Input elements count as one

Copy code The code is as follows:

var input_query=$("input:nth-child(2)");

2. Find all input elements that rank first among all child elements in the parent element

Copy code The code is as follows:

var input_query=$("input:first-child");

3. Find all input elements that are the last among all child elements in the parent element

Copy code The code is as follows:

var input_query=$("input:last-child");

4. Find all input elements that are the only child elements in the parent element

Copy code The code is as follows:

var input_query=$("input:only-child");

8. Form selector Forms

1. Find all input elements

Copy code The code is as follows:

var input_query=$(":input");

2. Find all text box elements

Copy code The code is as follows:

var text_query=$(":text");

3. Find all password box elements

Copy code The code is as follows:

var password_query=$(":password");

4. Find all checkboxes

Copy code The code is as follows:

var checkbox_query=$(":checkbox");

5. Find all submit button elements

Copy code The code is as follows:

var submit_query=$(":submit");

6. Find all image domain elements

Copy code The code is as follows:

var image_query=$(":image");

7. Find all reset button elements

Copy code The code is as follows:

var reset_query=$(":reset");

8. Find all button elements

Copy code The code is as follows:

var button_query=$(":button");

9. Find all file field elements

Copy code The code is as follows:

var file_query=$(":file");

9. Form Filters

1. Find all available input elements

Copy code The code is as follows:

var input_query=$("input:enabled");

2. Find all unavailable input elements

Copy code The code is as follows:

var input_query=$("input:disabled");

3. Find all selected radio checkboxes

Copy code The code is as follows:

var input_query=$("input:checked");

4. Find all selected drop-down boxes

Copy code The code is as follows:

var option_query=$("option:selected");