如何切换选择多个复选框，如 GMail?

2022-01-23 00:00:00 gmail javascript

在 GMail 中，用户可以单击电子邮件列表中的一个复选框，按住 Shift 键，然后选择第二个复选框.然后 JavaScript 将选择/取消选择两个复选框之间的复选框.

In GMail, the user can click on one checkbox in the email list, hold down the Shift key, and select a second checkbox. The JavaScript will then select/unselect the checkboxes that are between the two checboxes.

我很好奇这是怎么做到的?这是 JQuery 还是一些基本(或复杂)的 JavaScript?

I am curious as to how this is done? Is this JQuery or some basic (or complex) JavaScript?

推荐答案

我写了一个使用jquery的独立demo:

I wrote a self-contained demo that uses jquery:

$(document).ready(function() {
    var $chkboxes = $('.chkbox');
    var lastChecked = null;

    $chkboxes.click(function(e) {
        if (!lastChecked) {
            lastChecked = this;
            return;
        }

        if (e.shiftKey) {
            var start = $chkboxes.index(this);
            var end = $chkboxes.index(lastChecked);

            $chkboxes.slice(Math.min(start,end), Math.max(start,end)+ 1).prop('checked', lastChecked.checked);
        }

        lastChecked = this;
    });
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<html>
<head>
</head>
<body>
    <input type="checkbox" id="id_chk1" class="chkbox" value="1" />Check 1<br/>
    <input type="checkbox" id="id_chk2" class="chkbox" value="2" />Check 2<br/>
    <input type="checkbox" id="id_chk3" class="chkbox" value="3" />Check 3<br/>
    <input type="checkbox" id="id_chk4" class="chkbox" value="4" />Check 4<br/>
    <input type="checkbox" id="id_chk5" class="chkbox" value="5" />Check 5<br/>
    <input type="checkbox" id="id_chk6" class="chkbox" value="6" />Check 6<br/>
    <input type="checkbox" id="id_chk7" class="chkbox" value="7" />Check 7<br/>
</body>
</html>

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