使用JavaScript从元素中删除CSS类(没有jQuery)

Question

任何人都可以告诉我如何使用JavaScript删除元素上的类吗？请不要给我一个jQuery的答案,因为我不能使用它,我对此一无所知.

Answer 1

正确和标准的方法是使用classList.它现在在大多数现代浏览器的最新版本中得到广泛支持:

ELEMENT.classList.remove("CLASS_NAME");

文档:https://developer.mozilla.org/en/DOM/element.classList

Answer 2

document.getElementById("MyID").className =
    document.getElementById("MyID").className.replace(/\bMyClass\b/,'');

其中MyID是元素的ID,MyClass是您要删除的类的名称.

更新: 要支持包含短划线字符的类名,例如"My-Class",请使用

document.getElementById("MyID").className =
  document.getElementById("MyID").className
    .replace(new RegExp('(?:^|\\s)'+ 'My-Class' + '(?:\\s|$)'), ' ');

Answer 3

这是一种将此功能直接烘焙到所有DOM元素中的方法:

HTMLElement.prototype.removeClass = function(remove) {
    var newClassName = "";
    var i;
    var classes = this.className.split(" ");
    for(i = 0; i < classes.length; i++) {
        if(classes[i] !== remove) {
            newClassName += classes[i] + " ";
        }
    }
    this.className = newClassName;
}

Answer 4

function hasClass(ele,cls) {
    return ele.className.match(new RegExp('(\\s|^)'+cls+'(\\s|$)'));
}

function removeClass(ele,cls) {
        if (hasClass(ele,cls)) {
            var reg = new RegExp('(\\s|^)'+cls+'(\\s|$)');
            ele.className=ele.className.replace(reg,' ');
        }
    }

Answer 5

div.classList.add("foo");
div.classList.remove("foo");

更多信息,请访问https://developer.mozilla.org/en-US/docs/Web/API/element.classList

Answer 6

编辑

好的,完全重写.已经有一段时间了,我已经学到了一点,这些评论也有所帮助.

Node.prototype.hasClass = function (className) {
    if (this.classList) {
        return this.classList.contains(className);
    } else {
        return (-1 < this.className.indexOf(className));
    }
};

Node.prototype.addClass = function (className) {
    if (this.classList) {
        this.classList.add(className);
    } else if (!this.hasClass(className)) {
        var classes = this.className.split(" ");
        classes.push(className);
        this.className = classes.join(" ");
    }
    return this;
};

Node.prototype.removeClass = function (className) {
    if (this.classList) {
        this.classList.remove(className);
    } else {
        var classes = this.className.split(" ");
        classes.splice(classes.indexOf(className), 1);
        this.className = classes.join(" ");
    }
    return this;
};

老邮政 我只是在做这样的事情.这是我提出的解决方案......

// Some browsers don't have a native trim() function
if(!String.prototype.trim) {
    Object.defineProperty(String.prototype,'trim', {
        value: function() {
            return this.replace(/^\s+|\s+$/g,'');
        },
        writable:false,
        enumerable:false,
        configurable:false
    });
}
// addClass()
// first checks if the class name already exists, if not, it adds the class.
Object.defineProperty(Node.prototype,'addClass', {
    value: function(c) {
        if(this.className.indexOf(c)<0) {
            this.className=this.className+=' '+c;
        }
        return this;
    },
    writable:false,
    enumerable:false,
    configurable:false
});
// removeClass()
// removes the class and cleans up the className value by changing double 
// spacing to single spacing and trimming any leading or trailing spaces
Object.defineProperty(Node.prototype,'removeClass', {
    value: function(c) {
        this.className=this.className.replace(c,'').replace('  ',' ').trim();
        return this;
    },
    writable:false,
    enumerable:false,
    configurable:false
});

现在你可以打电话了 myElement.removeClass('myClass')

或链接它: myElement.removeClass("oldClass").addClass("newClass");

Answer 7

我想这很简单.

document.getElementById("whatever").classList.remove("className");

Answer 8

尝试:

function removeClassName(elem, name){
    var remClass = elem.className;
    var re = new RegExp('(^| )' + name + '( |$)');
    remClass = remClass.replace(re, '$1');
    remClass = remClass.replace(/ $/, '');
    elem.className = remClass;
}

Answer 9

var element = document.getElementById('example_id');
var remove_class = 'example_class';

element.className = element.className.replace(' ' + remove_class, '').replace(remove_class, '');