# Need to multiply a text box value and display in total text box

I have tweaked a JavaScript funtion I borrowed but need to tweak it more and cannot figure it out.  Currently, when a number is entered in one of my textboxes, that number is added to the "total" text box.  I have 6 text boxes.  Here is what I want to happen.  When a number is entered in textbox1, I want it multiplied by 4 and added to the total.  When a number is entered in textbox2, I want it multiplied by 8 and added to the total.  When a number is entered in textbox3, I want it multiplied by 16 and added to the total. Textboxes 4-6 are repeats of Textboxes 1-3. Here are the functions I am using.

function doTotal() {
var total = 0;
for (var idx=0;idx<=5;idx++) {
total += parseFloat(document.getElementById(fldName[idx]).value);
}
document.getElementById('txtTotal').value = total;
}
function calc(f) {
doTotal();

var idx;
var costIndex;
for (idx=0;idx<=5;idx++) {
if (f.name==fldName[idx]) {
costIndex = idx;
break;
}

for (idx=costIndex;idx<=5;idx++) {
document.getElementById(fldName[idx]).value = f.value;
}
doTotal();
}
}

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sort of a odd way to do things but here:

use whatever event you are using if in the input types or on a button:  i'll just call this onEvent="" ok?

<form name="tallyForm">
<input type="text" name="box1" onEvent="tallyForm.total.value += parseFloat(tallyForm.box1.value) * 4.0>
<input type="text" name="box2" onEvent="tallyForm.total.value += parseFloat(tallyForm.box2.value) * 8.0>
<input type="text" name="box3" onEvent="tallyForm.total.value += parseFloat(tallyForm.box3.value) * 16.0>

<input type="text" name="box4" onEvent="tallyForm.total.value += parseFloat(tallyForm.box4.value) * 4.0>
<input type="text" name="box5" onEvent="tallyForm.total.value += parseFloat(tallyForm.box5.value) * 8.0>
<input type="text" name="box6" onEvent="tallyForm.total.value += parseFloat(tallyForm.box6.value) * 16.0>

<input type="text" name="total" value="0">
</form>

Doing it this way doesn't require any fancy javascript function... the text boxes handle themselves and then update the total text box from their own event calls.  Like I said I don't know which event you are using but... There's an easy way of doing it... you would refrence them the same way tallyForm.box#.value from a standard javascript function too.

~Aqua
Commented:
Hi Wayne!! it is Xxavier here!! :o)  Give this little ditty a whirl

<script>
function calc(f){
sum=0
for (i=1;i<4;i++){
sum+=Math.pow(2,i+1)*f['box'+i].value
sum+=Math.pow(2,i+1)*f['box'+(i+3)].value
}
f.total.value=1*sum
}
</script>

<form>
<p><input type="text" name="box1" onblur=" calc(this.form)">1</p>
<p><input type="text" name="box2" onblur=" calc(this.form)">2</p>
<p><input type="text" name="box3" onblur=" calc(this.form)">3</p>
<p><input type="text" name="box4" onblur=" calc(this.form)">4 </p>
<p><input type="text" name="box5" onblur=" calc(this.form)">5 </p>
<p><input type="text" name="box6" onblur=" calc(this.form)">6</p>
<p><input type="text" name="total" onblur=" calc(this.form)">Total </p>

See ya Xx. :o)
</form>

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I appologize... I had a typo:

<form name="tallyForm">
<input type="text" name="box1" onEvent="tallyForm.total.value += parseFloat(tallyForm.box1.value) * 4.0;">
<input type="text" name="box2" onEvent="tallyForm.total.value += parseFloat(tallyForm.box2.value) * 8.0;">
<input type="text" name="box3" onEvent="tallyForm.total.value += parseFloat(tallyForm.box3.value) * 16.0;">

<input type="text" name="box4" onEvent="tallyForm.total.value += parseFloat(tallyForm.box4.value) * 4.0;">
<input type="text" name="box5" onEvent="tallyForm.total.value += parseFloat(tallyForm.box5.value) * 8.0;">
<input type="text" name="box6" onEvent="tallyForm.total.value += parseFloat(tallyForm.box6.value) * 16.0;">

<input type="text" name="total" value="0">
</form>

This method requires no javascript function call nor a overall tally of sums... Although Xx's solution will allow for updated fields and multiple updates rather than a signle update to a box.  Although his version will cause a problem when a text feild has no data AND it needs to be parsed as a float.

~Aqua
Author Commented:
Xxavier's response was what I was looking for.  However, I also like Aqua's response.  Thanks to both of you for your help.
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