Example of filter () method usage in jQuery, jqueryfilter

Last Update:2015-01-07 Source: Internet

Author: User

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This method can filter out elements or element sets that match the returned values of a specified expression or method.

Syntax structure 1:
Filters out a set of elements that match the specified expression.
Copy codeThe Code is as follows: $ (selector). filter (expr)

Parameter List:

Parameters	Description
Expr	String Value, used to filter the selector expression of the current element set.

Instance code:

Copy codeThe Code is as follows:
<! DOCTYPE html>
<Html>
<Head>
<Meta charset = "UTF-8">
<Meta name = "author" content = "http://www.bkjia.com/"/>
<Title> filter () function-helper's house </title>
<Script type = "text/javascript" src = "mytest/jQuery/jquery-1.8.3.js"> </script>
<Script type = "text/javascript">
$ (Document). ready (function (){
$ ("Li"). filter (". js" ).css ("color", "blue ")
})
</Script>
</Head>
<Body>
<Div>
<Ul>
<Li> HTML zone </li>
<Li class = "js"> Javascript area </li>
<Li> Div + Css area </li>
<Li> Jquery area </li>
</Ul>
</Div>
</Body>
</Html>

This Code sets the font color of the class li named js to blue.

Syntax structure 2:

Filter the specified jquery object from the element set.
Copy codeThe Code is as follows: $ (selector). filter (element)

Parameter List:

Parameters	Description
Element	The jQuery object or DOM object used to match the elements in the current element set.

Instance code:

Instance 1:

Copy codeThe Code is as follows:
<! DOCTYPE html>
<Html>
<Head>
<Meta charset = "UTF-8">
<Meta name = "author" content = "http://www.bkjia.com/"/>
<Title> filter () function-helper's house </title>
<Script type = "text/javascript" src = "mytest/jQuery/jquery-1.8.3.js"> </script>
<Script type = "text/javascript">
$ (Document). ready (function (){
$ ("Li"). filter (document. getElementById ("js" )).css ("color", "blue ")
})
</Script>
</Head>
<Body>
<Div>
<Ul>
<Li> HTML zone </li>
<Li id = "js"> Javascript area </li>
<Li> Div + Css area </li>
<Li> Jquery area </li>
</Ul>
</Div>
</Body>
</Html>

Example 2:

Copy codeThe Code is as follows:
<! DOCTYPE html>
<Html>
<Head>
<Meta charset = "UTF-8">
<Meta name = "author" content = "http://www.bkjia.com/"/>
<Title> filter () function-helper's house </title>
<Script type = "text/javascript" src = "mytest/jQuery/jquery-1.8.3.js"> </script>
<Script type = "text/javascript">
$ (Document). ready (function (){
$ ("Li"). filter ($ ("li" has 0]00000000.css ("color", "blue ")
})
</Script>
</Head>
<Body>
<Div>
<Ul>
<Li> HTML zone </li>
<Li id = "js"> Javascript area </li>
<Li> Div + Css area </li>
<Li> Jquery area </li>
</Ul>
</Div>
</Body>
</Html>

Syntax structure 3:

Filters out a set of elements that match the returned values of the specified function.
The filter () method calculates each object once (for example, $. each ).. If the call function returns false, the element is deleted; otherwise, the element is retained.
Copy codeThe Code is as follows: $ (selector). filter (function ())

Parameter List:

Parameters	Description
Function (index)	Defines the function that returns the matching value of filter. Index is the index value of the current element in the Matching Element Set.

Instance code:

Copy codeThe Code is as follows:
<! DOCTYPE html>
<Html>
<Head>
<Meta charset = "UTF-8">
<Meta name = "author" content = "http://www.bkjia.com/"/>
<Title> filter () function-helper's house </title>
<Script type = "text/javascript" src = "mytest/jQuery/jquery-1.8.3.js"> </script>
<Script type = "text/javascript">
$ (Document). ready (function (){
$ ("Ul"). filter (function (index ){
Return $ (". js", this). length = 0;
}).Css ("color", "blue ")
})
</Script>
</Head>
<Body>
<Div>
<Ul>
<Li> HTML zone </li>
<Li class = "js"> Javascript area </li>
<Li> Div + Css area </li>
<Li> Jquery area </li>
</Ul>
<Ul>
<Li> the font needs to change to Blue </li>
</Ul>
</Div>
</Body>
</Html>

I hope this article will help you with jQuery programming.

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

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Example of filter () method usage in jQuery, jqueryfilter

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