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    <p>In Javascript if <code>there is single texbox of a specific name then length function will be return undefined</code>.</p> <p>Here you can do two things.</p> <p>First <code>there is only single field of subtotal so u can assign value direct to val4 like given below</code></p> <pre><code>val4 = document.form4.price4.value; </code></pre> <p>Second <code>If you want to run for loop then</code></p> <pre><code> var val4 = 0; var form4 = document.form4.getElementsByTagName('input'); for( i = 0; i &lt; form4.length; i++ ){ if(form4[i].type == 'text' &amp;&amp; form4[i].name == 'price4'){ if(isNaN(parseInt(form4[i].value)) == false){ val4 = parseInt(parseInt(val4) + parseInt(form4[i].value)); } } } </code></pre> <p>Edited</p> <p>In function </p> <pre><code>&lt;script language="JavaScript" type="text/javascript"&gt; var total = document.getElementById("price4") function clickCh(caller){ if(caller.checked){ add(caller) } else { subtract(caller) } finalResult(); } function add(caller){ total.value = total.value*1 + caller.value*1} function subtract(caller){ total.value = total.value*1 - caller.value*1} function finalResult(){ var val1 = 0; for( i = 0; i &lt; document.form1.price.length; i++ ){ if( document.form1.price[i].checked == true ){ val1 = document.form1.price[i].value; } } var val2 = 0; for( i = 0; i &lt; document.form2.price2.length; i++ ){ if( document.form2.price2[i].checked == true ){ val2 = document.form2.price2[i].value; } } var val3 = 0; for( i = 0; i &lt; document.form3.price3.length; i++ ){ if( document.form3.price3[i].checked == true ){ val3 = document.form3.price3[i].value; } } var val4 = 0; var form4 = document.form4.getElementsByTagName('input'); for( i = 0; i &lt; form4.length; i++ ){ if(form4[i].type == 'text' &amp;&amp; form4[i].name == 'price4'){ if(isNaN(parseInt(form4[i].value)) == false){ val4 = parseInt(parseInt(val4) + parseInt(form4[i].value)); } } } var sum=parseInt(val1) + parseInt(val2) + parseInt(val3) + parseInt(val4); document.getElementById('valueTotal').value=sum; } &lt;/script&gt; </code></pre> <p>i hope it will be work for you</p> <p>thanks</p>
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    1. POSUM radio button values and checkboxes values in one calculation - javascript and html
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    1. USEr. Anurag Jain
    1. USEr. Anurag Jain
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    1. COThanks for the above code. This is definitely on the right track. The only issue is the subtotal (checkboxes) does not dynamically update the Total. The subtotal value will update only if the radio buttons selection are changed. Any ideas on how to have the total box update with any changes to checkbox an the radio buttons?
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    2. COHi You can do this. In your `javascript function clickCh that call on check/uncheck the checkbox Add code same as in DisplayPrice function `.
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    3. COHi, sorry to be a pain. Can you show me where to add it. I have tried a few variations and they do not work properly. Thanks for your help.
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