How can I shift-select multiple checkboxes like GMail?

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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 checkboxe

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耶瑟儿～

2020-11-30 18:10

I realy liked gyo's example and added some code so it works on all checkboxes with the same name.

I also added a MutationObserver so events are also handled on newly added checkboxes.

$(document).ready(function() {
    var previouslyClicked = {};

    var rangeEventHandler = function(event) {
        if (event.shiftKey && previouslyClicked[this.name] && this != previouslyClicked[this.name]) {
            var $checkboxes = $('input[type=checkbox][name='+this.name+']').filter(':visible');
            var start = $checkboxes.index( this );
            var end = $checkboxes.index( previouslyClicked[this.name] );
//              console.log('range', start, end, this, previouslyClicked[this.name]);
            $checkboxes.slice(Math.min(start,end), Math.max(start,end)+ 1).prop('checked', previouslyClicked[this.name].checked);
        } else {
            previouslyClicked[this.name] = this;
        }
    };

    if ("MutationObserver" in window) { // https://developer.mozilla.org/en-US/docs/Web/API/MutationObserver/MutationObserver to refresh on new checkboxes
        var mutationCallback = function(mutationList, observer) {
            mutationList.forEach((mutation) => {
                mutation.addedNodes.forEach((node) => {
                    if (node.nodeName == 'INPUT' && node.type == 'checkbox') {
                        $(node).on('click.selectRange', rangeEventHandler);
                    }
                });
            });
        };

        var observer = new MutationObserver(mutationCallback);
        observer.observe(document, {
            childList: true,
            attributes: false,  // since name is dynamically read
            subtree: true
        });
    }

    $('input[type=checkbox][name]').on('click.selectRange', rangeEventHandler);
});

<html>
<head>
</head>
<body>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
  <div>
    First:
    <input type="checkbox" name="first">
    <input type="checkbox" name="first">
    <input type="checkbox" name="first">
    <input type="checkbox" name="first">
    <input type="checkbox" name="first">
  </div>
  <div>
    Second:
    <input type="checkbox" name="second">
    <input type="checkbox" name="second">
    <input type="checkbox" name="second">
    <input type="checkbox" name="second">
    <input type="checkbox" name="second">
  </div>
</body>
</html>

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