How get total sum from input box values using Javascript?

I am not perfect in Javascript.. I want to show total sum of values entered in qty input boxes in next input box named total without refreshing page. Can anyone will help me to figure it out..?

Here is javascript

 <script type="text/javascript"> 
 var howmanytoadd = 2;
 var rows;

 function calc() {
     var tot = 0;
     for (var i = 0; i < rows.length; i++) {
         var linetot = 0;
         rows[i].getElementsByTagName('input')[howmanytoadd].value = linetot;
         tot += linetot;
     }
     document.getElementById('total').value = tot
 }
 onload = function () {
     rows = document.getElementById('tab').getElementById('qty1');
     for (var i = 0; i < rows.length; i++) {
         rows.getElementsByTagName('input')[i].onkeyup = calc;
     }
 }
</script>

Here is my html code:

Qty1 : <input type="text" name="qty1" id="qty"/><br>
Qty2 : <input type="text" name="qty2" id="qty"/><br>
Qty3 : <input type="text" name="qty3" id="qty"/><br>
Qty4 : <input type="text" name="qty4" id="qty"/><br>
Qty5 : <input type="text" name="qty5" id="qty"/><br>
Qty6 : <input type="text" name="qty6" id="qty"/><br>
Qty7 : <input type="text" name="qty7" id="qty"/><br>
Qty8 : <input type="text" name="qty8" id="qty"/><br>
<br><br>
Total : <input type="text" name="total" id="total"/>

here is screen shot here is screen shot

Answers:

Answer

Javascript:

window.sumInputs = function() {
    var inputs = document.getElementsByTagName('input'),
        result = document.getElementById('total'),
        sum = 0;            

    for(var i=0; i<inputs.length; i++) {
        var ip = inputs[i];

        if (ip.name && ip.name.indexOf("total") < 0) {
            sum += parseInt(ip.value) || 0;
        }

    }

    result.value = sum;
}?   

Html:

Qty1 : <input type="text" name="qty1" id="qty"/><br>
Qty2 : <input type="text" name="qty2" id="qty"/><br>
Qty3 : <input type="text" name="qty3" id="qty"/><br>
Qty4 : <input type="text" name="qty4" id="qty"/><br>
Qty5 : <input type="text" name="qty5" id="qty"/><br>
Qty6 : <input type="text" name="qty6" id="qty"/><br
Qty7 : <input type="text" name="qty7" id="qty"/><br>
Qty8 : <input type="text" name="qty8" id="qty"/><br>
<br><br>
Total : <input type="text" name="total" id="total"/>

<a href="javascript:sumInputs()">Sum</a>

Example: http://jsfiddle.net/fRd9N/1/

?

Answer

To sum with decimal use this:

In the javascript change parseInt with parseFloat and add this line tot.toFixed(2); for this result:

    function findTotal(){
    var arr = document.getElementsByName('qty');
    var tot=0;
    for(var i=0;i<arr.length;i++){
        if(parseFloat(arr[i].value))
            tot += parseFloat(arr[i].value);
    }
    document.getElementById('total').value = tot;
    tot.toFixed(2);
}

Use step=".01" min="0" type="number" in the input filed

Qty1 : <input onblur="findTotal()" step=".01" min="0" type="number" name="qty" id="qty1"/><br>
Qty2 : <input onblur="findTotal()" step=".01" min="0" type="number" name="qty" id="qty2"/><br>
Qty3 : <input onblur="findTotal()" step=".01" min="0" type="number" name="qty" id="qty3"/><br>
Qty4 : <input onblur="findTotal()" step=".01" min="0" type="number" name="qty" id="qty4"/><br>
Qty5 : <input onblur="findTotal()" step=".01" min="0" type="number" name="qty" id="qty5"/><br>
Qty6 : <input onblur="findTotal()" step=".01" min="0" type="number" name="qty" id="qty6"/><br>
Qty7 : <input onblur="findTotal()" step=".01" min="0" type="number" name="qty" id="qty7"/><br>
Qty8 : <input onblur="findTotal()" step=".01" min="0" type="number" name="qty" id="qty8"/><br>
<br><br>
Total : <input type="number" step=".01" min="0" name="total" id="total"/>
Answer

I need to sum the span elements so I edited Akhil Sekharan's answer below.

var arr = document.querySelectorAll('span[id^="score"]');
var total=0;
    for(var i=0;i<arr.length;i++){
        if(parseInt(arr[i].innerHTML))
            total+= parseInt(arr[i].innerHTML);
    }
console.log(total)

You can change the elements with other elements link will guide you with editing.

https://www.w3.org/TR/css3-selectors/#attribute-substrings

Answer

Try:

Qty1 : <input onblur="findTotal()" type="text" name="qty" id="qty1"/><br>
Qty2 : <input onblur="findTotal()" type="text" name="qty" id="qty2"/><br>
Qty3 : <input onblur="findTotal()" type="text" name="qty" id="qty3"/><br>
Qty4 : <input onblur="findTotal()" type="text" name="qty" id="qty4"/><br>
Qty5 : <input onblur="findTotal()" type="text" name="qty" id="qty5"/><br>
Qty6 : <input onblur="findTotal()" type="text" name="qty" id="qty6"/><br>
Qty7 : <input onblur="findTotal()" type="text" name="qty" id="qty7"/><br>
Qty8 : <input onblur="findTotal()" type="text" name="qty" id="qty8"/><br>
<br><br>
Total : <input type="text" name="total" id="total"/>


    <script type="text/javascript">
function findTotal(){
    var arr = document.getElementsByName('qty');
    var tot=0;
    for(var i=0;i<arr.length;i++){
        if(parseInt(arr[i].value))
            tot += parseInt(arr[i].value);
    }
    document.getElementById('total').value = tot;
}

    </script>
Answer

$(document).ready(function(){

		//iterate through each textboxes and add keyup
		//handler to trigger sum event
		$(".txt").each(function() {

			$(this).keyup(function(){
				calculateSum();
			});
		});

	});

	function calculateSum() {

		var sum = 0;
		//iterate through each textboxes and add the values
		$(".txt").each(function() {

			//add only if the value is number
			if(!isNaN(this.value) && this.value.length!=0) {
				sum += parseFloat(this.value);
			}

		});
		//.toFixed() method will roundoff the final sum to 2 decimal places
		$("#sum").html(sum.toFixed(2));
	}
body {
				font-family: sans-serif;
			}
			#summation {
				font-size: 18px;
				font-weight: bold;
				color:#174C68;
			}
			.txt {
				background-color: #FEFFB0;
				font-weight: bold;
				text-align: right;
			}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>

<table width="300px" border="1" style="border-collapse:collapse;background-color:#E8DCFF">
	<tr>
		<td width="40px">1</td>
		<td>Butter</td>
		<td><input class="txt" type="text" name="txt"/></td>
	</tr>
	<tr>
		<td>2</td>
		<td>Cheese</td>
		<td><input class="txt" type="text" name="txt"/></td>
	</tr>
	<tr>
		<td>3</td>
		<td>Eggs</td>
		<td><input class="txt" type="text" name="txt"/></td>
	</tr>
	<tr>
		<td>4</td>
		<td>Milk</td>
		<td><input class="txt" type="text" name="txt"/></td>
	</tr>
	<tr>
		<td>5</td>
		<td>Bread</td>
		<td><input class="txt" type="text" name="txt"/></td>
	</tr>
	<tr>
		<td>6</td>
		<td>Soap</td>
		<td><input class="txt" type="text" name="txt"/></td>
	</tr>
	<tr id="summation">
		<td>&nbsp;</td>
		<td align="right">Sum :</td>
		<td align="center"><span id="sum">0</span></td>
	</tr>
</table>

Answer

Try this:

function add() 
{
  var sum = 0;
  var inputs = document.getElementsByTagName("input");
  for(i = 0; i <= inputs.length; i++) 
  {
   if( inputs[i].name == 'qty'+i) 
   {
     sum += parseInt(input[i].value);
   }
  }
  console.log(sum)

}
Answer

$(document).ready(function(){

		//iterate through each textboxes and add keyup
		//handler to trigger sum event
		$(".txt").each(function() {

			$(this).keyup(function(){
				calculateSum();
			});
		});

	});

	function calculateSum() {

		var sum = 0;
		//iterate through each textboxes and add the values
		$(".txt").each(function() {

			//add only if the value is number
			if(!isNaN(this.value) && this.value.length!=0) {
				sum += parseFloat(this.value);
			}

		});
		//.toFixed() method will roundoff the final sum to 2 decimal places
		$("#sum").html(sum.toFixed(2));
	}
body {
				font-family: sans-serif;
			}
			#summation {
				font-size: 18px;
				font-weight: bold;
				color:#174C68;
			}
			.txt {
				background-color: #FEFFB0;
				font-weight: bold;
				text-align: right;
			}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>

<table width="300px" border="1" style="border-collapse:collapse;background-color:#E8DCFF">
	<tr>
		<td width="40px">1</td>
		<td>Butter</td>
		<td><input class="txt" type="text" name="txt"/></td>
	</tr>
	<tr>
		<td>2</td>
		<td>Cheese</td>
		<td><input class="txt" type="text" name="txt"/></td>
	</tr>
	<tr>
		<td>3</td>
		<td>Eggs</td>
		<td><input class="txt" type="text" name="txt"/></td>
	</tr>
	<tr>
		<td>4</td>
		<td>Milk</td>
		<td><input class="txt" type="text" name="txt"/></td>
	</tr>
	<tr>
		<td>5</td>
		<td>Bread</td>
		<td><input class="txt" type="text" name="txt"/></td>
	</tr>
	<tr>
		<td>6</td>
		<td>Soap</td>
		<td><input class="txt" type="text" name="txt"/></td>
	</tr>
	<tr id="summation">
		<td>&nbsp;</td>
		<td align="right">Sum :</td>
		<td align="center"><span id="sum">0</span></td>
	</tr>
</table>

Answer

Here's a simpler solution using what Akhil Sekharan has provided but with a little change.

var inputs = document.getElementsByTagName('input');

for (var i = 0; i < inputs.length; i += 1) {
if(parseInt(inputs[i].value)){
        inputs[i].value = '';
       }
    }????
document.getElementById('total').value = total;

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