Totalling up check boxes

I have the following code, and would basically like to calculate a total for the checkboxes checked. I cant use the value= part of the field because this holds a unique ID for the item.

So I was thinking of doing an "onclick add 15 to total field" type thing. Can anyone help me do this, and also recalculate the total when teh checkbox is unchecked?


<form name="form1" method="post" action="">
  <p>
    <input name="item[]" type="checkbox" id="item[]" value="1">
    Item 1<br>
    <input name="item[]" type="checkbox" id="item[]" value="2">
    Item 2<br>
    <input name="item[]" type="checkbox" id="item[]" value="3">
    Item 3</p>
  <p>Total
    <input type="text" name="textfield">
  </p>
  <p>
    <input type="submit" name="Submit" value="Submit">
  </p>
</form>
fox_stattonAsked:
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StormyWatersCommented:
Shouldn't you be using the id property for a unique id?
0
fox_stattonAuthor Commented:
Oh... wait.. you might actually be right...
0
fox_stattonAuthor Commented:
Just looked at it, the value has to be the ID so that I can process it using PHP and Arrays.

Ive made some progress, Im using:

 <script type="text/javascript">

     function reCalc(v, b)
     {
          var sp = document.getElementById ('total');
          if (!b) v = - v;
          var t = parseInt(sp.innerHTML);
          sp.innerHTML = parseInt(t) + parseInt(v);
     }


 </script>


and then:


     <input type="checkbox" name="array[]" valuex="19.50" value="12" onClick="reCalc(this.valuex, this.checked);">
Total:
        &pound;<span id="total">0</span>




Problem is that this doesnt handle decimals, can anyone help?






0
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GwynforWebCommented:
try these

<script>
function getTotal(form){
 total=0
 for (i=0;i<form.elements.length;i++)
   if (form.elements[i].id="item[]") total+=form.elements[i].checked
 form.textfield.value=total
}
</script>

<form name="form1" method="post" action>
  <p><input name="item[]" type="checkbox" id="item[]" value="1"> Item 1<br>
    <input name="item[]" type="checkbox" id="item[]" value="2"> Item 2<br>
    <input name="item[]" type="checkbox" id="item[]" value="3"> Item 3</p>
  <p>Total
    <input type="text" name="textfield"><br>
    <input type="button" value="get total" onclick="getTotal(this.form)"> </p>
    <input type="submit" name="Submit" value="Submit"> </p>
</form>

you could also put the function call on the onclick event of each checkbox to update automatically
 
<script>
function getTotal(form){
 total=0
 for (i=0;i<form.elements.length;i++)
   if (form.elements[i].id="item[]") total+=form.elements[i].checked
 form.textfield.value=total
}
</script>

<form name="form1" method="post" action>
  <p><input name="item[]" type="checkbox" id="item[]" value="1"  onclick="getTotal(this.form)"> Item 1<br>
    <input name="item[]" type="checkbox" id="item[]" value="2"  onclick="getTotal(this.form)"> Item 2<br>
    <input name="item[]" type="checkbox" id="item[]" value="3"  onclick="getTotal(this.form)"> Item 3</p>
  <p>Total
    <input type="text" name="textfield" value='0'><p>
    <input type="submit" name="Submit" value="Submit"> </p>
</form>


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GwynforWebCommented:
or perhaps it is this that you need ?

<script>
function getTotal(form){
 total=0
 for (i=0;i<form.elements.length;i++)
   if (form.elements[i].checked && form.elements[i].name=="item[]") total+=1*form.elements[i].id
 form.textfield.value=total
}
</script>

<form name="form1" method="post" action>
  <p><input name="item[]" type="checkbox" id="34" value="1" onclick="getTotal(this.form)">
  Item 1<br>
  <input name="item[]" type="checkbox" id="56" value="2" onclick="getTotal(this.form)"> Item
  2<br>
  <input name="item[]" type="checkbox" id="11" value="3" onclick="getTotal(this.form)"> Item
  3</p>
  <p>Total <input type="text" name="textfield" value="0"></p>
  <p><input type="submit" name="Submit" value="Submit"> </p>
</form>
0
GwynforWebCommented:
my last post is the one you want
0
fox_stattonAuthor Commented:
Hi thats great, just one more thing. Is there a way to show only two decimal places in the total field, with it rounding down if there are more?
0
GwynforWebCommented:
<script>
function getTotal(form){
 total=0
 for (i=0;i<form.elements.length;i++)
   if (form.elements[i].checked && form.elements[i].name=="item[]") total+=1*form.elements[i].id
 form.textfield.value=total.toFixed(2)
}
</script>

<form name="form1" method="post" action>
  <input name="item[]" type="checkbox" id="34.6767" value="1"onclick="getTotal(this.form)"> Item 1<br>
  <input name="item[]" type="checkbox" id="56.553" value="2" onclick="getTotal(this.form)">Item 2<br>
  <input name="item[]" type="checkbox" id="11.367" value="3" onclick="getTotal(this.form)">Item 3</p>
 
  <p>Total <input type="text" name="textfield" value="0"></p>
  <p><input type="submit" name="Submit" value="Submit"></p>
</form>
0

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