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copied!<p>A few problems I see in your code: </p> <ol> <li>In HTML you cannot have <code>id</code> and <code>name</code> attributes with spaces (<a href="http://www.w3.org/TR/html4/types.html#type-id" rel="nofollow">http://www.w3.org/TR/html4/types.html#type-id</a>)</li> <li>You are calculating the <code>bmi</code> but aren't assigning it to the form element. </li> <li>You are missing closing brace on the javascript <code>calc()</code> function.</li> </ol> <p>The solution would be to fix the id attribute first, for e.g you could use camel case notation like follows: </p> <pre><code><form id="bmi" action="main.php" method="post"> <p>Enter your height(in inches):</p><input type="text" id="heightBox" name="heightBox"> <p>Enter your weight(in pounds):</p><input type="text" id="weightBox" name="weightBox"> <input type="hidden" id="bmi" name="bmi"> <input type="submit" value="Calculate" id="calcButton" name="calcButton" onClick="calc()"> </form> </code></pre> <p>Update the javascript like follows:</p> <pre><code>function calc() { // get variables from textboxes var height=document.getElementById('heightBox').value; var weight=document.getElementById('weightBox').value; var bmi=document.getElementById('bmi'); // calculate BMI weight/=2.2; height/=39.37; bmi.value=Math.round(weight/(height*height)); } </code></pre> <p>Another point to note is that you are using <code>mysql_</code> extensions which are deprecated. You want to start using <a href="http://php.net/manual/en/book.mysqli.php" rel="nofollow">mysqli</a> or <a href="http://php.net/manual/en/book.pdo.php" rel="nofollow">PDO</a> instead. </p>

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