alert(document.querySelectorAll('input[type="checkbox"]:checked').length);
alert(document.querySelectorAll('input[name="selectItem[]"]:checked').length);
References :javascript - Count the number of checked checkboxes in html - Stack Overflow
alert(document.querySelectorAll('input[type="checkbox"]:checked').length);
alert(document.querySelectorAll('input[name="selectItem[]"]:checked').length);
References :javascript - Count the number of checked checkboxes in html - Stack Overflow
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