blocks|key|2537787|text|下面是一个函数，用于确定匹配选择器的任何元素是否至少有一个属性：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2537788|function+hasOneOrMoreAttributes(selector)+{
++++var+hasAttribute+=+false;
++++$(selector).each(function(index,+element)+{
++++++++if+(element.attributes.length+>+0)+{
++++++++++++hasAttribute+=+true;
++++++++++++return+false;+//+breaks+out+of+the+each+once+we+find+an+attribute
++++++++}
++++});
++++return+hasAttribute;
}|code-block|syntax|javascript|2537789|用法：|2537790|if+(hasOneOrMoreAttributes('.someClass'))+{
++++//+Do+something
}|2537791|如果你想对至少有一个属性的选定元素进行操作，那就更简单了--你可以创建一个自定义过滤器：|2537792|//+Works+on+the+latest+versions+of+Firefox,+IE,+Safari,+and+Chrome
//+But+not+IE+6+(for+reasons+I+don't+understand)
jQuery.expr[':'].hasAttributes+=+function(elem)+{
++++return+elem.attributes.length;
};|2537793|它可以像这样使用：|2537794|$(document).ready(function(){
++++$('li:hasAttributes').addClass('superImportant');
}|2537795|entityMap^0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|Y|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|10|8|@]|9|@]|A|$]]|$1|Q|3|R|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|S|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|T|$]]

Here's a function that determines whether any of the elements matching a selector have at least one attribute:

<pre><code>function hasOneOrMoreAttributes(selector) {
 var hasAttribute = false;
 $(selector).each(function(index, element) {
 if (element.attributes.length &gt; 0) {
 hasAttribute = true;
 return false; // breaks out of the each once we find an attribute
 }
 });
 return hasAttribute;
}
</code></pre>

Usage:

<pre><code>if (hasOneOrMoreAttributes('.someClass')) {
 // Do something
}
</code></pre>

If you want to operate on selected elements that have at least one attribute, it's even easier - you create a custom filter:

<pre><code>// Works on the latest versions of Firefox, IE, Safari, and Chrome
// But not IE 6 (for reasons I don't understand)
jQuery.expr[':'].hasAttributes = function(elem) {
 return elem.attributes.length;
};
</code></pre>

Which you can use like this:

<pre><code>$(document).ready(function(){
 $('li:hasAttributes').addClass('superImportant');
}
</code></pre>

blocks|key|830846|text|如果您想查看元素是否具有特定属性，只需执行以下操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|830847|if+($('#something').is('[attribute]'))+{
++//+...
}|code-block|syntax|javascript|830848|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

If you want to see if the element has a particular attribute, just do this:

<pre><code>if ($('#something').is('[attribute]')) {
 // ...
}
</code></pre>

blocks|key|82794|text|$("selector").get(0).hasAttributes("attributes");|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|82795|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>$("selector").get(0).hasAttributes("attributes");
</code></pre>

blocks|key|2537712|text|您需要使用来自Get+all+Attributes+from+a+HTML+element+with+Javascript/jQuery的信息|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2537713|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/2048720^0|7|1P|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

You'd need to use information from <a href="https://stackoverflow.com/questions/2048720">Get all Attributes from a HTML element with Javascript/jQuery</a>

blocks|key|1127776|text|不是完整的jQuery代码，但它可以工作|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1127777|$("a").click(
function+()+{
++++if($("a").get(0).attributes+>+0)
++++++++alert("it+has+attributes");
})|code-block|syntax|javascript|1127778|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Not a whole jQuery code but it will work

<pre><code>$("a").click(
function () {
 if($("a").get(0).attributes &gt; 0)
 alert("it has attributes");
})
</code></pre>

blocks|key|1127883|text|我不确定您是否只想返回包含该属性的元素，但如果是这样的话，我发现最简单的方法是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1127884|$('selector[attribute]')|code-block|syntax|javascript|1127885|这将返回jquery对象，使其包含包含该属性的所有元素，而不管其值如何。例如。|1127886|$(':text[maxlength]').addClass('has_max_length');|1127887|这将为所有具有maxlength属性的文本输入提供一个'has_max_length‘类。|1127888|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

I'm not sure if you're wanting to just return the elements that contain the attribute, but if you are, I've found the easiest method to be:

<pre><code>$('selector[attribute]')
</code></pre>

That will return the jquery object to include all elements that contain the attribute regardless of its value. For example.

<pre><code>$(':text[maxlength]').addClass('has_max_length');
</code></pre>

This would give all text inputs with the maxlength attribute a class of 'has_max_length'.

blocks|key|83571|text|以下是我发现的一个更可靠的解决方案，它可以知道一个元素是否定义了在IE、Chrome和Firefox中工作的属性：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|83572|$(selector).each(function(index,+element)+{
++++if+(element.hasAttributes)+{+//+Some+browser+supports+this+method
++++++++if+(element.hasAttributes())+{
++++++++++++return+true;
++++++++}
+++++}+else+{
+++++++++++//+IE+counts+many+attributes+-+even+if+not+set+explicitly
+++++++++++var+attrs+=+element.attributes;
+++++++++++for+(var+i+=+0;+i+<+attrs.length;+i%2B%2B)+{
++++++++++++++++if+(attrs[i].specified)+{
++++++++++++++++++++return+true;
++++++++++++++++}
++++++++++++}
+++++}
+++++return+false;
});|code-block|syntax|javascript|83573|问题是，即使没有显式设置，IE也会返回高属性计数。例如，对于一个简单的|83574|标记，IE告诉我它有111个属性。有了这个解决方案，我能够过滤掉那些我不感兴趣的属性。|83575|83576|这里采用了这个解决方案：http://help.dottoro.com/ljevmnkf.php+(只是复制了它，以防页面被删除！)|offset|length|83577|entityMap|0|LINK|mutability|MUTABLE|url|http://help.dottoro.com/ljevmnkf.php^0|0|0|0|0|0|C|10|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Y|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Z|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|10|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|11|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|12|8|@]|9|@$N|13|O|14|1|15]]|A|$]]|$1|P|3|-4|5|6|7|16|8|@]|9|@]|A|$]]]|Q|$R|$5|S|T|U|A|$V|W]]]]

Here's a solution that I found to be more reliable to know if an element has defined attributes that works in IE, Chrome and Firefox:

<pre><code>$(selector).each(function(index, element) {
 if (element.hasAttributes) { // Some browser supports this method
 if (element.hasAttributes()) {
 return true;
 }
 } else {
 // IE counts many attributes - even if not set explicitly
 var attrs = element.attributes;
 for (var i = 0; i &lt; attrs.length; i++) {
 if (attrs[i].specified) {
 return true;
 }
 }
 }
 return false;
});
</code></pre>

The problem is that IE returns high attributes count even when none is set explicitly. For example, for a simple &lt; p > tag, IE was telling me it had 111 attributes. With that solution, I was able to filter out those attributes that I wasn't interested in.

This solution was taken here: <a href="http://help.dottoro.com/ljevmnkf.php" rel="nofollow">http://help.dottoro.com/ljevmnkf.php</a> (just copied it in case the page is removed!)

I can check if an element have a specific attribute with:

<pre><code>if ($('#A').attr('myattr') !== undefined) {
 // attribute exists
} else {
 // attribute does not exist
}
</code></pre>

How can I check if an element have any attribute?

Thank you

jQuery check if element contains any attribute

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我可以使用以下命令检查元素是否具有特定属性：if ($('#A').attr('myattr') !== undefined) {    // attribute exists} else {    // attribute does not exist}如何检查一个元素是否有任何属性？谢谢

问jQuery检查元素是否包含任何属性
EN

回答 7

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问jQuery检查元素是否包含任何属性
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