"select multiple checkboxes by select2"
Bootstrap 4.0.0 Snippet by bnk2972

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<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<link href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.6-rc.0/css/select2.min.css" rel="stylesheet" />
<div class="container">
<select id="country" multiple>
<option disabled></option>
<option value="AK">Alaska</option>
<option value="HI">Hawaii</option>
<option value="CA">California</option>
<option value="NV">Nevada</option>
<option value="OR">Oregon</option>
<option value="WA">Washington</option>
<option value="AZ">Arizona</option>
<option value="CO">Colorado</option>
<option value="ID">Idaho</option>
<option value="MT">Montana</option>
<option value="NE">Nebraska</option>
<option value="NM">New Mexico</option>
<option value="ND">North Dakota</option>
<option value="UT">Utah</option>
<option value="WY">Wyoming</option>
<option value="AL">Alabama</option>
<option value="AR">Arkansas</option>
<option value="IL">Illinois</option>
<option value="IA">Iowa</option>
<option value="KS">Kansas</option>
<option value="KY">Kentucky</option>
<option value="LA">Louisiana</option>
<option value="MN">Minnesota</option>
<option value="MS">Mississippi</option>
<option value="MO">Missouri</option>
<option value="OK">Oklahoma</option>
<option value="SD">South Dakota</option>
<option value="TX">Texas</option>
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.container {
padding-top: 20px;
}
.select2-selection__choice__remove {
display: none !important;
}
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$(document).ready(function() {
let branch_all = [];
function formatResult(state) {
if (!state.id) {
var btn = $('<div class="text-right"><button id="all-branch" style="margin-right: 10px;" class="btn btn-default">Select All</button><button id="clear-branch" class="btn btn-default">Clear All</button></div>')
return btn;
}
branch_all.push(state.id);
var id = 'state' + state.id;
var checkbox = $('<div class="checkbox"><input id="'+id+'" type="checkbox" '+(state.selected ? 'checked': '')+'><label for="checkbox1">'+state.text+'</label></div>', { id: id });
return checkbox;
}
function arr_diff(a1, a2) {
var a = [], diff = [];
for (var i = 0; i < a1.length; i++) {
a[a1[i]] = true;
}
for (var i = 0; i < a2.length; i++) {
if (a[a2[i]]) {
delete a[a2[i]];
} else {
a[a2[i]] = true;
}
}
for (var k in a) {
diff.push(k);
}
return diff;
}
let optionSelect2 = {
templateResult: formatResult,
closeOnSelect: false,
width: '100%'
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