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In jQuery: Example of has selector usage, jquery Selector
This document describes the usage of the has selector in jQuery. Share it with you for your reference. The specific analysis is as follows:
This selector matches the element that contains the element that the selector matches.
Syntax structure:
Copy codeThe Code is as follows: $ (": has (selector )")
The definition of this selector may be a bit writable. In general, if an element contains the elements matched by the selector, the element will be matched. For example:
Copy codeThe Code is as follows: $ ("div: has (p )")
The preceding selector matches the div element containing the p element.
This selector should also be used with other selectors, such as class selector and element selector. For example:
Copy codeThe Code is as follows: $ ("div: has (p)" ).css ("color", "blue ")
The above Code sets the font color of the div element containing p to blue.
If it is not used with other selectors, the default state is to use with the * selector. For example, $ (": has") is equivalent to $ ("*: has ").
Parameter List:
| Parameters | Description |
| Selector | A Selector Used for filtering. |
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> helping customers </title>
<Style type = "text/css">
Div
{
Border: 1px solid green;
Height: 50px;
}
Span {border: 1px solid blue ;}
</Style>
<Script type = "text/javascript" src = "mytest/jQuery/jquery-1.8.3.js"> </script>
<Script type = "text/javascript">
$ (Document). ready (function (){
$ ("Button"). click (function (){
$ ("Div: has (span)" bar .css ("border", "1px solid red ")
})
})
</Script>
</Head>
<Body>
<Div> I do not include span </div>
<Div> <span> I am a span </span> </div>
<Button> click to view results </button>
</Body>
</Html>
The above Code sets the border color of the div containing the span element to red.
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> helping customers </title>
<Style type = "text/css">
Div
{
Border: 1px solid green;
Height: 50px;
}
Span {border: 1px solid blue ;}
</Style>
<Script type = "text/javascript" src = "mytest/jQuery/jquery-1.8.3.js"> </script>
<Script type = "text/javascript">
$ (Document). ready (function (){
$ ("Button"). click (function (){
$ ("*: Has (span)" bar .css ("border", "1px solid red ")
})
})
</Script>
</Head>
<Body>
<Div> I do not include span </div>
<Div> <span> I am a span </span> </div>
<P> <span> I am a span </span> </p>
<Button> click to view results </button>
</Body>
</Html>
Because the preceding Code does not specify a selector used in combination with the has selector, it is used with the * selector by default, therefore, the code above can set the border color of all elements containing all span elements to red.
I hope this article will help you with jQuery programming.
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