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Research on the use of filter (FN) in jquery

Source: Internet
Author: User
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The official note given by the filter (FN) in jquery is:

Filters out the collection of elements that match the return value of the specified function the inside of the function computes each object once (as ' $.each '). If the called function returns false then this element is deleted, otherwise it will be preserved. There is no problem with this explanation, but the example given is problematic. Example is

HTML Code:

<p><ol><li>hello</li></ol></p><p>how is you?</p>

JQuery Code:

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

Results:

[<p>how is you?</p>] but everyone in the test will find the,<p> is not allowed to put <ol>, in some browsers will error. I used the filter (FN) method in one of my programs. I'll just put out the example I'm using. The function that I want to do is actually very simple, it is to display all the <div> content of a page. Some of the <div> content is dynamically loaded. [C-sharp]View Plaincopy < param name= "allowfullscreen" value= "false" >< param name= "wmode" value= "Transparent" >
  2. <%@ page language="C #" autoeventwireup="true" codebehind="JqeryClick.aspx.cs" inherits=" Ajaxenabledwebapplication1.jqeryclick "%>
  4. <! DOCTYPE HTML public "-//W3C//DTD XHTML 1.0 transitional//en" "http://www.w3.org/TR/xhtml1/DTD/ Xhtml1-transitional.dtd ">
  6. "http://www.w3.org/1999/xhtml" >
  8. "Server" >
  10. <title> Untitled Page </title>
  16. <mce:script src="jquery-1.3.2.min.js" mce_src= "Jquery-1.3.2.min.js" type= "Text/javascript">< /mce:script>
  22. <mce:script type="Text/javascript" ><!--
  24. $ (function () {
  26. $ ("#btn"). Click (function () {
  30. two drop-down lists are currently selected in Viewdiv.  The value is displayed.
  32. $ ("#ViewDiv"). HTML ($ ("#ddlSel"). Val () + "-----" + $ ("#Select1"). Val ());
  38. //Here's a little bit of what I'm going to illustrate, I'm using an. aspx file that will generate itself within <form> a few <div>
  40. //So here I add a big div to fetch what we want.
  44. //Use Filter (FN) here to remove the items containing OL
  46. $ ("#all"). Children ("div"). Filter (function (index) {
  48. return $ ("ol", this ). Size () = = 0;
  50. }). Each (function (index) {
  54. //The contents of these div are shown here. Please note that here we use
  56. //$ ("div", this). HTML () This method
  58. Alert ($ ("#" +this.id+""). html ());
  60. });
  62. })
  64. })
  68. --></mce:script>
  72. <body>
  74. <form id="Form1" runat= "Server" >
  76. <div id="All" >
  78. <div id="one" >
  80. <asp:dropdownlist id="Ddlsel" runat= "Server" >
  82. <asp:listitem value="1" > First item </asp:ListItem>
  84. <asp:listitem value="2" > Second item </asp:ListItem>
  86. </asp:DropDownList>
  88. <select id="Select1" >
  90. <option value="3" > Third </option>
  92. <option value="4" > Fourth </option>
  94. </select>
  96. <input id="btn" type="button" value="show Information"/></div>
  100. <div id="Viewdiv" ></div>
  108. <div id="2" ><ol><li>hello</li></ol></div><div id="1" >How is You ?</div>
  112. </div>
  114. </form>
  116. </body>

Research on the use of filter (FN) in jquery

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