Get checkbox is checked or not using Javascript -

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i've got problem can't solve. partly because can't explain right terms. i'm new sorry clumsy question.

below can see overview of goal.

i'm running code in magento 

<input type="checkbox" style="margin-left:24px" class="mydelete" name="checkall" onclick='checkedall(testcheck);' />

added id attribute element.

<input type="checkbox" style="margin-left:24px" class="mydelete" name="checkall" id="checkall"onclick='checkedall();' />

javascript

function checkedall(){     if (document.getelementbyid('checkall').checked) {         alert("checked");     } else {         alert("you didn't check it! let me check you.")     } }

demo


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