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Research on the use of filter (fn) in jquery, jqueryfilter

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Research on the use of filter (fn) in jquery, jqueryfilter

The official description of filter (fn) in jquery is as follows:

 

Filter out the element set that matches the returned value of the specified function. This function calculates each object once (as '$. each '). if the called function returns false, the element is deleted; otherwise, the element is retained. This statement is correct, but the example is incorrect. Example:

HTML code:

<P> <ol> <li> Hello </li> </ol> </p> <p> How are you? </P>

JQuery code:

$ ("P"). filter (function (index) {return $ ("ol", this). length = 0 ;});

Result:

[<P> How are you? </P>] However, when you try it, you will find that <p> is not allowed to <ol>, and errors will be reported in some browsers. In my own program, I used the filter (fn) method. I will release my example. The function I want to do is to display all the <div> content on a page. Some <div> content is dynamically loaded. [C-sharp]View plaincopy
  1. <% @ Page Language = "C #" AutoEventWireup = "true" CodeBehind = "JqeryClick. aspx. cs" Inherits = "AJAXEnabledWebApplication1.JqeryClick" %>
  2. <! DOCTYPE html PUBLIC "-// W3C // dtd xhtml 1.0 Transitional // EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  3. <Html xmlns = "http://www.w3.org/1999/xhtml">
  4. <Head runat = "server">
  5. <Title> No title page </title>
  8. <Mce: script src = "jquery-1.3.2.min.js" mce_src = "jquery-1.3.2.min.js" type = "text/javascript"> </mce: script>
  11. <Mce: script type = "text/javascript"> <! --
  12. $ (Function (){
  13. $ ("# Btn"). click (function (){
  15. // Display the selected content in the ViewDiv drop-down list. The value is displayed.
  16. $ ("# ViewDiv" ).html ($ ("# ddlSel"). val () + "-----" + $ ("# Select1"). val ());
  19. // Here is something I want to explain. The. aspx file I use will generate several of my own <div> files in <form>, which is not what I want to obtain
  20. // So here I add a large div to retrieve what we want.
  22. // Filter (fn) is used to filter out the items containing ol.
  23. $ ("# All"). children ("div"). filter (function (index ){
  24. Return $ ("ol", this). size () = 0;
  25. }). Each (function (index ){
  27. // The content of these divs is displayed here. Please note that we use
  28. // $ ("Div", this#.html ()
  29. Alert ($ ("#" + this. id + "" ).html ());
  30. });
  31. })
  32. })
  34. // --> </Mce: script>
  35. </Head>
  36. <Body>
  37. <Form id = "form1" runat = "server">
  38. <Div id = "all">
  39. <Div id = "one">
  40. <Asp: DropDownList ID = "ddlSel" runat = "server">
  41. <Asp: ListItem Value = "1"> Item 1 </asp: ListItem>
  42. <Asp: ListItem Value = "2"> Item 2 </asp: ListItem>
  43. </Asp: DropDownList>
  44. <Select id = "Select1">
  45. <Option value = "3"> Item 3 </option>
  46. <Option value = "4"> Item 4 </option>
  47. </Select>
  48. <Input id = "btn" type = "button" value = ""/> </div>
  50. <Div id = "ViewDiv"> </div>
  54. <Div id = "2"> <ol> <li> Hello </li> </ol> </div> <div id = "1"> How are you? </Div>
  56. </Div>
  57. </Form>
  58. </Body>
  59. </Html>

What is filter () in jquery?

JQuery API definition:
1. jQueryfilter (fn)
Filters out a set of elements that match the specified function return value.
HTML code:
<P> <ol> <li> Hello </li> </ol> </p> <p> How are you? </P>
JQuery code:
$ ("P"). filter (function (index ){
Return $ ("ol", this). length = 0;
});
Result:
[<P> How are you? </P>]

2. filter (expr)
Filters out a set of elements that match the specified expression.
This method is used to narrow the matching range. Multiple Expressions separated by commas
Example Description: retain the elements with the select class
HTML code:
<P> Hello </p> <p> Hello Again </p> <p class = "selected"> And Again </p>
JQuery code:
$ ("P"). filter (". selected ")
Result:
[<P class = "selected"> And Again </p>]

Filter Method in jquery

By... I am also confused ,., Why...

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