找出是否选中了复选框

I want to validate the radio buttons in a form with jQuery, but it doesn't work. Even if I check a radio button the code below (variable "checked") returns false.

我想用jQuery验证表单中的单选按钮,但它不起作用。即使我检查单选按钮,下面的代码(变量“checked”)也会返回false。

What am I doing wrong?

我究竟做错了什么?

        $('.radio').each(function(){
            var checked = $(this).is(':checked');
            if($(this).is(':checked') === false){
                e.preventDefault();
            }
        });

3 个解决方案

#1

try this

  $('.radio').each(function(){
            var checked = $(this).attr("checked") == "checked";
            if(checked){
                e.preventDefault();
            }
        });

#2

use

 $('.radio').click(function(){               
                if($(this).is(':checked') == false){
                    e.preventDefault();
                }
    });

use $(this).is(:checked) or $(this).attr('checked') to get the status of checkbox

使用$(this).is(:checked)或$(this).attr('checked')来获取复选框的状态

#3

        $('.radio').each(function(e){
            var checked = this.checked;  // using this.checked is better
            if(!checked){  // not checked
                e.preventDefault();
            }
        });

or if you want to :is(':checked') then

或者如果你想:is(':checked')那么

        $('.radio').each(function(e){
            var checked = $(this).is(':checked');
            if(!checked){  // not checked
                e.preventDefault();
            }
        });

#1