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I believe you can just do it like thisif ($(this).prop('checked')) {
Then it will only check if the checkbox that you click on is checked or not.
Demo
$(function() {
$('.dealprice').on('input', function() {
if ($(this).prop('checked')) {
//CHECKED
console.log("Checked");
const getPrice = $(this).closest("tr").find('input[name=itemprice]').val();
console.log(getPrice);
} else {
//UNCHECKED
console.log("Uncheck");
const getPrice = $(this).closest("tr").find('input[name=itemprice]').val();
console.log(getPrice);
}
});
});.tg {border-collapse:collapse;border-spacing:0;}
.tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px;
overflow:hidden;padding:10px 5px;word-break:normal;}
.tg th{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px;
font-weight:normal;overflow:hidden;padding:10px 5px;word-break:normal;}
.tg .tg-qh0q{background-color:#c0c0c0;color:#000000;font-weight:bold;text-align:center;vertical-align:top}
.tg .tg-0lax{text-align:left;vertical-align:top}
.tg .tg-amwm{font-weight:bold;text-align:center;vertical-align:top}<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<table class="tg">
<thead>
<tr>
<th class="tg-qh0q">Item</th>
<th class="tg-qh0q">Price</th>
<th class="tg-qh0q">Deal</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tg-0lax">Book</td>
<td class="tg-0lax">$ 10 <input type="hidden" name="itemprice" value="10"></td>
<td class="tg-0lax"><input type="checkbox" class="dealprice" name="deal[12][0]"></td>
</tr>
<tr>
<td class="tg-0lax">Pencil</td>
<td class="tg-0lax">$ 5 <input type="hidden" name="itemprice" value="5"></td>
<td class="tg-0lax"><input type="checkbox" class="dealprice" name="deal[12][1]"></td>
</tr>
<tr>
<td class="tg-0lax">Pen</td>
<td class="tg-0lax">$ 8 <input type="hidden" name="itemprice" value="8"></td>
<td class="tg-0lax"><input type="checkbox" class="dealprice" name="deal[12][2]"></td>
</tr>
<tr>
<td class="tg-0lax">spidol</td>
<td class="tg-0lax">$ 15 <input type="hidden" name="itemprice" value="15"></td>
<td class="tg-0lax"><input type="checkbox" class="dealprice" name="deal[12][3]"></td>
</tr>
</tbody>
</table><script>
$(document).ready(function(){
$(".dealprice").change(function(){
if($(this).is(":checked")){
console.log(true);
} else {
console.log(false);
}
});
});
</script>
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