确定每个广播组是否都选择了一个选项 [英] Determine if every radio group has had an option selected

问题描述

在启用提交按钮之前，我需要确保所有广播组均已应答.如果我有:

I need to make sure that all the radio groups have been answered before I enable the submit button. If I have:

var radioBtns = $('input').filter(':radio');

它告诉我我有多少个单选按钮，但是我需要知道是否有尚未选择选项的组.

It tells me how many radio buttons I've got, but I need to know if there are any groups that haven't had an option selected yet.

推荐答案

如果您知道有多少组，就可以这样做:

If you know how many groups you have you can just do:

if($('input:radio:checked').length < numGroups){
    // At least one group isn't checked
}

否则，您需要首先计算组数.我想不出什么办法可以做到这一点:

Otherwise you need to count the number of groups first. I can't think of any way to do this better then:

var rgroups = [];
$('input:radio').each(function(index, el){
        var i;
        for(i = 0; i < rgroups.length; i++)
            if(rgroups[i] == $(el).attr('name'))
                return true;
        rgroups.push($(el).attr('name'));
    }
);
rgroups = rgroups.length;

if($('input:radio:checked').length < rgroups)
    alert('You must fill in all the fields.');
else
    alert('Thanks!');

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