取消选中通过POST []中的Echo检查的选中框

Question

I want to uncheck these boxes on pressing my clear button. Form.reset doesn't work. Not does getelementbyid.checked = false.

Here is how I have checked them

<input type="checkbox"  name="free" <?php echo empty($_POST['free']) ? '' : '         checked="checked" '; ?>>Free Shipping<br>

This is the clear button:

<input type="reset" value="clear" onclick="clearform()" style="float:right;        width:80px; margin-right:5px;">

This is the function:

function clearform()
{
   document.getElementById("results").innerHTML = "";
   document.getElementById("results").style.visibility = "hidden";
   document.getElementById("searchform").reset();
}

Answer 1

just add id to checkbox. change

 <input type="checkbox"  name="free" ... 

to
<input type="checkbox" name="free" id="free" ...

add document.getElementById("free").checked = false; in function clearform()

function clearform()
{
    document.getElementById("results").innerHTML = "";
    document.getElementById("results").style.visibility = "hidden";
    document.getElementById("searchform").reset();
    document.getElementById("free").checked = false;
}