jQuery检查element是否具有以某些字符串开头的类 [英] jQuery check if element has a class beginning with some string

问题描述

我需要遍历页面中的某些元素，然后对于每个元素，如果它有一个以"C"开头的类，请执行一些操作.

I need to loop through some elements in the page and then, for each one, if it had a class beginning with, for example, "C", do something.

$('#dialog li').each(function(){
    if ($(this).hasClass("^C")){
         //do something
    }
}

听起来可能很愚蠢，但是我应该在if子句上使用什么选择器/方法?

It may sound silly, but what selector/method should I use on the if clause?

推荐答案

用$('#dialog li[class^="C"]')小心！它只会匹配其类属性以"C"开头的元素，而不匹配那些以C开头的类的元素.例如，它将不匹配<li class="foo Clown">.

Carefull with $('#dialog li[class^="C"]')! It will only match elements, whose class attribute starts with "C" not ones with a class starting with C. For example it will not match <li class="foo Clown">.

AFAIK您想要的是不可能单独使用jQuery的.您将需要遍历这些类，并分别检查每个类.像这样:

AFAIK what you want is not possible mit jQuery alone. You would need to loop through the classes and check each separatly. Something like:

$('#dialog li').filter(function(){
  var classes = this.className.split(/\s/);
  for (var i = 0, len = classes.length; i < len; i++) 
    if (/^C/.test(classes[i])) return true;
  return false;
}).each( ... )

或者，您应该考虑更改您的方法，并为所有元素提供一个附加的类，并根据该类进行过滤.这样做的好处是它也可以在CSS中使用:

Alternativly you should consider changing your approach, and give all elements an additional class and filter by that. This has the addvantage that it can also be used in CSS:

<li class="Clown Clown-Funny">
<li class="Clown Clown-Sad">
<li class="Clown Clown-Rodeo">

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