计算 HTML 中选中的复选框的数量 [英] Count the number of checked checkboxes in HTML

问题描述

所以基本上我想计算被勾选的复选框的数量.我让我的代码达到了成功计数的程度，但我想放入一个警报，显示勾选的复选框数量，代码执行此操作但不显示总数，它每次刷新都会增加总数.我只想知道如何显示总数.

So basically i want to count the number of checkboxes that are ticked. I get my code to the point where it counts them successfully, but I want to put in an alert that shows the number of checkboxes ticked, the code does this but doesn't show the total count, it increments the total every refresh. I just want to know how I can show a total count.

当单击是"单选按钮时，它应该显示总数.

It should display the total when the radio button 'yes' is clicked.

<br />Apples
<input type="checkbox" name="fruit" />Oranges
<input type="checkbox" name="fruit" />Mango
<input type="checkbox" name="fruit" />
<br />Yes
<input type="radio" name="yesorno" id="yes" onchange="checkboxes()"

function checkboxes(){
    var inputElems = document.getElementsByTagName("input"),
    count = 0;
    for (var i=0; i<inputElems.length; i++) {
    if (inputElems[i].type === "checkbox" && inputElems[i].checked === true){
        count++;
        alert(count);
    }
}}

推荐答案

这应该可以解决问题:

alert(document.querySelectorAll('input[type="checkbox"]:checked').length);

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