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Xiaoqiang’s road to HTML5 mobile development (35) - Detailed explanation of filters in jQuery

黄舟
黄舟Original
2017-02-04 14:47:281304browse

1. Basic filter selector
:first
:last
:not(selector) :Nodes other than the nodes matched by the selector
:even :even
:odd :odd
:eq(index)
:gt(index) : Bigger than him

:lt(index) : Smaller than him 

<html>  
    <head>  
        <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.0/jquery.min.js"></script>  
        <script>  
            $(function(){  
                $(&#39;#b1&#39;).click(function(){  
                    //$(&#39;tr:first&#39;).css(&#39;background-color&#39;,&#39;#cccccc&#39;);  
                    //$(&#39;tbody tr:first&#39;).css(&#39;background-color&#39;,&#39;#cccccc&#39;);  
                    //$(&#39;tbody tr:not(#tr2)&#39;).css(&#39;background-color&#39;,&#39;#cccccc&#39;);  
                    //$(&#39;tbody tr:even&#39;).css(&#39;background-color&#39;,&#39;#cccccc&#39;);  
                    $(&#39;tbody tr:eq(2)&#39;).css(&#39;background-color&#39;,&#39;#cccccc&#39;);  
                });  
            });  
        </script>  
    </head>  
    <body>  
        <table border="1" cellpadding="0" cellspacing="0" width="60%">  
            <thead>  
                <tr>  
                    <td>name</td><td>age</td>  
                </tr>  
            </thead>  
            <tbody>  
                <tr><td>zs</d><td>22</td></tr>  
                <tr id="tr2"><td>ls</d><td>22</td></tr>  
                <tr><td>ww</d><td>22</td></tr>  
                <tr><td>ll</d><td>22</td></tr>  
            </tbody>  
        </table>  
        <input type="button" value="clickMe" id="b1"/>  
    <body>  
</html>

2. Content filtering selector
:contains(text)
:empty: A node with no child nodes or a node with empty text content
:has(selector)
:parent: A node that contains a parent node

<html>  
    <head>  
        <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.0/jquery.min.js"></script>  
        <script>  
            $(function(){  
                $(&#39;#b1&#39;).click(function(){  
                    $(&#39;:contains(hello)&#39;).css(&#39;background&#39;,&#39;red&#39;);  
                    //$(&#39;:empty&#39;).css(&#39;&#39;,&#39;&#39;);  
                    //$(&#39;p :has(p)&#39;).css(&#39;&#39;,&#39;&#39;);  
                });  
            });  
        </script>  
    </head>  
    <body>  
        <p>  
            <p>hello</p>  
            <p>你好</p>  
            <p>  
                <p>java</p>  
            <p>  
            <input type="button" value="clickMe" id="b1"/>  
        </p>  
    </body>  
  
</html>

Xiaoqiang’s road to HTML5 mobile development (35) - Detailed explanation of filters in jQuery

Actually, my goal is not to make the entire screen turn red. Why does it all turn red? Look at the code below again. I added a p

$(&#39;p:contains(hello)&#39;).css(&#39;background&#39;,&#39;red&#39;);

Xiaoqiang’s road to HTML5 mobile development (35) - Detailed explanation of filters in jQuery

in front of contains(hell0). You can see that although it is not full screen, it is not the result I want. How can I do this? What about changing just the background below hello to red? You can do this

$(&#39;p p:contains(hello)&#39;).css(&#39;background&#39;,&#39;red&#39;);

Xiaoqiang’s road to HTML5 mobile development (35) - Detailed explanation of filters in jQuery

3. Visibility filter selector
:hidden
Find input type="hidden" and display=none:visible

$(function(){  
    $(&#39;#a1&#39;).click(function(){  
        $(&#39;p:hidden&#39;).css(&#39;display&#39;,&#39;block&#39;);  
        //如过有这个样式则去掉，没有则加上  
        $(&#39;#d1&#39;).toggleClass(&#39;show&#39;);  
    });  
    //每点击一次，执行一个函数，循环执行  
    $(&#39;#a1&#39;).toggle(function(){  
        //$(&#39;#d1&#39;).css(&#39;display&#39;,&#39;block&#39;);  
        $(&#39;#d1&#39;).show(400); //在400毫秒种打开  
        //或者使用slow fast normal三个参数  
        $(&#39;#d1&#39;).show(slow);  
    },function(){  
        //$(&#39;#d1&#39;).css(&#39;display&#39;,&#39;none&#39;);  
        $(&#39;#d1&#39;).hide();  
    });  
});

4. Filter selector
(1) Attribute filter selector [attribute]
[attribute=value]
[attribute!=value]

<html>  
    <head>  
        <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.0/jquery.min.js"></script>  
        <script>  
            $(function(){  
                $(&#39;#b1&#39;).click(function(){  
                    $(&#39;p[id=p1]&#39;).html(&#39;hello java&#39;);  
                });  
            });  
        </script>  
    </head>  
    <body>  
        <p id="p1">hello</p>  
        <p>world</p>  
        <input type="button" value="click" id="b1"/>  
    </body>  
</html>

(2), Child element filter selector: Returns all matching child nodes under the parent node
:nth-child(index/even/odd)
n starts from 1

<html>  
    <head>  
        <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.0/jquery.min.js"></script>  
        <script>  
            $(function(){  
                $(&#39;#b1&#39;).click(function(){  
                    $(&#39;ul li:nth-child(1)&#39;).html(&#39;item100&#39;);  
                });  
            });  
        </script>  
    </head>  
    <body>  
            <ul>  
                <li>item1</li>  
                <li>item2</li>  
                <li>item3</li>  
  
            </ul>  
            <ul>  
                <li>item4</li>  
                <li>item5</li>  
                <li>item6</li>  
  
            </ul>  
            <input type="button" value="click" id="b1"/>  
    </body>  
</html>

(3), form object Attribute filter selector
:enabled
:disabled //The text input box cannot be entered
:checked//The selected node
:selected

5, form selector
:input $(':input');Return all input
:text
:pasword
:checkbox
:radio
:submit
:image
:reset
:button

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