删除以某个字符串开头的所有类

小开

You don't need any jQuery specific code to handle this. Just use a RegExp to replace them:

$("#a").className = $("#a").className.replace(/\bbg.*?\b/g, '');

You can modify this to support any prefix but the faster method is above as the RegExp will be compiled only once:

function removeClassByPrefix(el, prefix) {
var regx = new RegExp('\\b' + prefix + '.*?\\b', 'g');
el.className = el.className.replace(regx, '');
return el;
}

小开

Prestaul's answer was helpful, but it didn't quite work for me. The jQuery way to select an object by id didn't work. I had to use

document.getElementById("a").className

instead of

$("#a").className

小开

最佳答案

With jQuery, the actual DOM element is at index zero, this should work

$('#a')[0].className = $('#a')[0].className.replace(/\bbg.*?\b/g, '');

小开

http://www.mail-archive.com/jquery-en@googlegroups.com/msg03998.html says:

...and .removeClass() would remove all classes...

It works for me ;)

cheers

小开

I also use hyphen'-' and digits for class name. So my version include '\d-'

$('#a')[0].className = $('#a')[0].className.replace(/\bbg.\d-*?\b/g, '');

小开

I've written a simple jQuery plugin - alterClass, that does wildcard class removal. Will optionally add classes too.

$( '#foo' ).alterClass( 'foo-* bar-*', 'foobar' )

小开

A regex splitting on word boundary \b isn't the best solution for this:

var prefix = "prefix";
var classes = el.className.split(" ").filter(function(c) {
return c.lastIndexOf(prefix, 0) !== 0;
});
el.className = classes.join(" ").trim();

or as a jQuery mixin:

$.fn.removeClassPrefix = function(prefix) {
this.each(function(i, el) {
var classes = el.className.split(" ").filter(function(c) {
return c.lastIndexOf(prefix, 0) !== 0;
});
el.className = $.trim(classes.join(" "));
});
return this;
};

2018 ES6 Update:

const prefix = "prefix";
const classes = el.className.split(" ").filter(c => !c.startsWith(prefix));
el.className = classes.join(" ").trim();

小开

I know it's an old question, but I found out new solution and want to know if it has disadvantages?

$('#a')[0].className = $('#a')[0].className
.replace(/(^|\s)bg.*?(\s|$)/g, ' ')
.replace(/\s\s+/g, ' ')
.replace(/(^\s|\s$)/g, '');

小开

(function($)
{
return this.each(function()
{
var classes = $(this).attr('class');


if(!classes || !regex) return false;


var classArray = [];


classes = classes.split(' ');


for(var i=0, len=classes.length; i<len; i++) if(!classes[i].match(regex)) classArray.push(classes[i]);


$(this).attr('class', classArray.join(' '));
});
})(jQuery);

小开

$("#element").removeAttr("class").addClass("yourClass");

小开

Using 2nd signature of $.fn.removeClass :

// Considering:
var $el = $('<div class="  foo-1 a b foo-2 c foo"/>');


function makeRemoveClassHandler(regex) {
return function (index, classes) {
return classes.split(/\s+/).filter(function (el) {return regex.test(el);}).join(' ');
}
}


$el.removeClass(makeRemoveClassHandler(/^foo-/));
//> [<div class="a b c foo"></div>]

小开

I was looking for solution for exactly the same problem. To remove all classes starting with prefix "fontid_" After reading this article I wrote a small plugin which I'm using now.

(function ($) {
$.fn.removePrefixedClasses = function (prefix) {
var classNames = $(this).attr('class').split(' '),
className,
newClassNames = [],
i;
//loop class names
for(i = 0; i < classNames.length; i++) {
className = classNames[i];
// if prefix not found at the beggining of class name
if(className.indexOf(prefix) !== 0) {
newClassNames.push(className);
continue;
}
}
// write new list excluding filtered classNames
$(this).attr('class', newClassNames.join(' '));
};
}(fQuery));

Usage:

$('#elementId').removePrefixedClasses('prefix-of-classes_');

小开

An approach I would use using simple jQuery constructs and array handling functions, is to declare an function that takes id of the control and prefix of the class and deleted all classed. The code is attached:

function removeclasses(controlIndex,classPrefix){
var classes = $("#"+controlIndex).attr("class").split(" ");
$.each(classes,function(index) {
if(classes[index].indexOf(classPrefix)==0) {
$("#"+controlIndex).removeClass(classes[index]);
}
});
}

Now this function can be called from anywhere, onclick of button or from code:

removeclasses("a","bg");

小开

In one line ... Removes all classes that match a regular expression someRegExp

$('#my_element_id').removeClass( function() { return (this.className.match(/someRegExp/g) || []).join(' ').replace(prog.status.toLowerCase(),'');});

小开

For modern browsers:

let element = $('#a')[0];
let cls = 'bg';


element.classList.remove.apply(element.classList, Array.from(element.classList).filter(v=>v.startsWith(cls)));

小开

The top answer converted to jQuery for those wanting a jQuery only solution:

const prefix = 'prefix'
const classes = el.attr('class').split(' ').filter(c => !c.startsWith(prefix))
el.attr('class', classes.join(' ').trim())