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    <p>If you are using jquery, You need to do as like </p> <pre><code>$('form.wpcf7-form.payment-form').submit(function() { var price = isNaN(parseFloat($("#price").val())) ? 0.0 : parseFloat($("#price").val()) var payslips = isNaN(parseFloat($("#payslips-required").val())) ? 0.0 : parseFloat($("#payslips-required").val()) var totalPrice = price * payslips; $("#totalprice").val(totalPrice); }); </code></pre> <p>And secondly if you just need javascript way, use like this </p> <pre><code>document.forms[0].onsubmit = function() { var price = document.getElementById("price").value; var payslips = document.getElementById("payslips-required").value; price = isNaN(parseFloat(price)) ? 0.0 : parseFloat(price); payslips = isNaN(parseFloat(payslips)) ? 0.0 : parseFloat(payslips); var totalPrice = price * payslips; document.getElementById("totalprice").value = totalPrice; } </code></pre> <p><strong>UPDATE</strong></p> <p>Add the below fields after the html you have show, which prints the value.</p> <pre><code>&lt;input type="hidden" id="my-price" value="[price]" /&gt; &lt;input type="hidden" id="my-payslips-required" value="[payslips-required]" /&gt; </code></pre> <p>Then call the script to run,</p> <p>so finally, your code will be,</p> <pre><code>&lt;script&gt; function CalculateTotal() { var price = document.getElementById("price").value; var payslips = document.getElementById("payslips-required").value; price = isNaN(parseFloat(price)) ? 0.0 : parseFloat(price); payslips = isNaN(parseFloat(payslips)) ? 0.0 : parseFloat(payslips); var totalPrice = price * payslips; document.getElementById("totalprice").value = totalPrice; } &lt;/script&gt; </code></pre> <p>Try the above.</p>
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    1. PODisplay javascript variable in wordpress
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    1. USAshis Kumar
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    1. COPrice and payslips-required are from a form you can see it here http://payslips4u.co.uk/order-monthly-payslips/ How would I go about displaying the code you provided into the div/span tags?
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    2. COUpdated the code. Just i need to know when did you like the code to be run. Do you want this to run when you submit the form, on on change event you want ?
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    3. COOnce the form is submitted
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