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copied!<p>Since all other answers are jquery based, I'll offer a pure javascript solution. Assuming the following form:</p> <pre><code><form id="myform"> <input type="checkbox" value="username1" name="check[0]" /><br/> <input type="checkbox" value="userusername2" name="check[1]" /><br/> <input type="checkbox" value="userusername3" name="check[2]" /><br/> </form> </code></pre> <p>You could compute the number of checkbox elements with the following logic:</p> <pre><code><script type="text/javascript"> var myform = document.getElementById('myform'); var inputTags = myform.getElementsByTagName('input'); var checkboxCount = 0; for (var i=0, length = inputTags.length; i<length; i++) { if (inputTags[i].type == 'checkbox') { checkboxCount++; } } alert(checkboxCount); </script> </code></pre> <p>BTW: As others have noted, the <code>id</code> attribute in any HTML tag should be unique within the document. I've omitted your <code>id="1"</code> attributes in my sample HTML above.</p> <h2>Update:</h2> <p>If you simply want to count all checkbox elements on the entire page without using a containing form element, this should work:</p> <pre><code><script type="text/javascript"> var inputTags = document.getElementsByTagName('input'); var checkboxCount = 0; for (var i=0, length = inputTags.length; i<length; i++) { if (inputTags[i].type == 'checkbox') { checkboxCount++; } } alert(checkboxCount); </script> </code></pre>

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