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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野的像风

2020-11-30 17:43

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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悲哀的现实

2020-11-30 17:46

It seems like every answer I can find online is completely dependent on jQuery for this. JQuery adds very little functionality. Here's a quick version that doesn't require any frameworks:

function allow_group_select_checkboxes(checkbox_wrapper_id){
    var lastChecked = null;
    var checkboxes = document.querySelectorAll('#'+checkbox_wrapper_id+' input[type="checkbox"]');

    //I'm attaching an index attribute because it's easy, but you could do this other ways...
    for (var i=0;i<checkboxes.length;i++){
        checkboxes[i].setAttribute('data-index',i);
    }

    for (var i=0;i<checkboxes.length;i++){
        checkboxes[i].addEventListener("click",function(e){

            if(lastChecked && e.shiftKey) {
                var i = parseInt(lastChecked.getAttribute('data-index'));
                var j = parseInt(this.getAttribute('data-index'));
                var check_or_uncheck = this.checked;

                var low = i; var high=j;
                if (i>j){
                    var low = j; var high=i; 
                }

                for(var c=0;c<checkboxes.length;c++){
                    if (low <= c && c <=high){
                        checkboxes[c].checked = check_or_uncheck;
                    }   
                }
            } 
            lastChecked = this;
        });
    }
}

And then initialize it whenever you need it:

allow_group_select_checkboxes('[id of a wrapper that contains the checkboxes]')

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生来不讨喜

2020-11-30 17:49

This is done through fairly simple javascript.

They keep track of the id of the last checked box and when when another checkbox is checked they use the shiftKey event attribute to see if shift was held while clicking the checkbox. If so they set the checked property of each checkbox in between the two to true.

To determine when a box is checked they probably use an onclick event on the checkboxes

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感情败类

2020-11-30 17:50

Found the better solution it works for both select and deselects checkboxes.
Uses a core javascript & 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', e.target.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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孤街浪徒

2020-11-30 17:54

Got this solution from http://abcoder.com/javascript/jquery/simple-check-uncheck-all-jquery-function/ (now dead):

JavaScript and HTML code

var NUM_BOXES = 10;

// last checkbox the user clicked
var last = -1;

function check(event) {
  // in IE, the event object is a property of the window object
  // in Mozilla, event object is passed to event handlers as a parameter
  if (!event) { event = window.event }
  var num = parseInt(/box\[(\d+)\]/.exec(this.name)[1]);
  if (event.shiftKey && last != -1) {
     var di = num > last ? 1 : -1;
     for (var i = last; i != num; i += di) {
        document.forms.boxes['box[' + i + ']'].checked = true;
     }
  }
  last = num;
}

function init() {
  for (var i = 0; i < NUM_BOXES; i++) {
    document.forms.boxes['box[' + i + ']'].onclick = check;
  }
}

<body onload="init()">
    <form name="boxes">
    <input name="box[0]" type="checkbox">
    <input name="box[1]" type="checkbox">
    <input name="box[2]" type="checkbox">
    <input name="box[3]" type="checkbox">
    <input name="box[4]" type="checkbox">
    <input name="box[5]" type="checkbox">
    <input name="box[6]" type="checkbox">
    <input name="box[7]" type="checkbox">
    <input name="box[8]" type="checkbox">
    <input name="box[9]" type="checkbox">
    </form>
</body>

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无人及你

2020-11-30 17:57

Here is also another implementation similar to Outlooks multiple selection..

    <script type="text/javascript">

function inRange(x, range)
{
    return (x >= range[0] && x <= range[1]);
}

$(document).ready(function() {
    var $chkboxes = $('.chkbox');
    var firstClick = 1;
    var lastClick = null;
    var range = [];

    $chkboxes.click(function(e) {
        if(!e.shiftKey && !e.ctrlKey) {

            $('#index-' + firstClick).prop('checked', false);

            firstClick = $chkboxes.index(this) + 1;

            if (firstClick !== null && firstClick !== ($chkboxes.index(this)+1)) {
                $('#index-' + firstClick).prop('checked', true);
            }
        } else if (e.shiftKey) {
            lastClick = $chkboxes.index(this) + 1;
            if ((firstClick < lastClick) && !inRange(lastClick, range)) {
                for (i = firstClick; i < lastClick; i++) {
                    $('#index-' + i).prop('checked', true);
                }
                range = [firstClick, lastClick];
            } else if ((firstClick > lastClick) && !inRange(lastClick, range)) {
                for (i = lastClick; i < firstClick; i++) {
                    $('#index-' + i).prop('checked', true);
                }
                range = [lastClick, firstClick];
            } else if ((firstClick < lastClick) && inRange(lastClick, range)) {
                for (i = 1; i < 100; i++) {
                    $('#index-' + i).prop('checked', false);
                }

                for (i = firstClick; i < lastClick; i++) {
                    $('#index-' + i).prop('checked', true);
                }
                range = [firstClick, lastClick];
            }else if ((firstClick > lastClick) && inRange(lastClick, range)) {
                for (i = 1; i < 100; i++) {
                    $('#index-' + i).prop('checked', false);
                }

                for (i = lastClick; i < firstClick; i++) {
                    $('#index-' + i).prop('checked', true);
                }
                range = [lastClick, firstClick];
            }
        }
    });
});

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