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Adding the contents of a form with 'OnChange'?

I'm having trouble creating a very simple running total of a
few drop down list. I have three seperate dropdown lists, I
want the user to simply select some numbers and have the
total of the selected numbers displayed.

I'm not much of a programmer and this is really just a
experiment. Can anyone help me out here. I know the code
below doesnt work (no form tags etx0 but I thought the logic
was fine?

Example of what I would like to happen

User selects 2,5,6 and a total of 13 is displayed somewhere
on the page. This total changes when the user picks
different numbers.

Can anyone help me out here?

------------------------------------------------------------
--------
Code

</head>
<script language="javas cript">
function workit()
{
var itemA=document. select.value
var itemB=document. select2.value
var itemC=document. select3.value
var total = itemA+itemB+ite mC;
}
</script>
<body>
<p>
<select name="select" onChange="worki t()">
<option value="1" selected>One</option>
<option value="2">Two</option>
<option value="3">Three </option>
</select>
<select name="select2" onChange="worki t()">
<option value="4" selected>Four</option>
<option value="5">Five</option>
<option value="6">Six</option>
</select>
<select name="select3" onChange="worki t()">
<option value="7" selected>Seven</option>
<option value="8">Eight </option>
<option value="9">Nine</option>
</select>
</p>
<p><span id=mytotal></span></p>
</body>
</html>
Jul 23 '05 #1
5 3589

I've been picking up javascript these past six months - I think my
single line below should do what you want to do, though you might find
one or two others who might correct my methods...

</head>
<script language="javas cript">
function workit()
{
var itemA=document. select.value
var itemB=document. select2.value
var itemC=document. select3.value
var total = itemA+itemB+ite mC; document.getEle mentById('mytot al').innerHTML= total; }
</script>
<body>
<p>
<select name="select" onChange="worki t()">
<option value="1" selected>One</option>
<option value="2">Two</option>
<option value="3">Three </option>
</select>
<select name="select2" onChange="worki t()">
<option value="4" selected>Four</option>
<option value="5">Five</option>
<option value="6">Six</option>
</select>
<select name="select3" onChange="worki t()">
<option value="7" selected>Seven</option>
<option value="8">Eight </option>
<option value="9">Nine</option>
</select>
</p>
<p><span id=mytotal></span></p>
</body>
</html>


Hope I've helped,
randelld
Jul 23 '05 #2
Reply Via Newsgroup wrote:
I've been picking up javascript these past six months - I think my single line below should do what you want to do, though you might find one or two others who might correct my methods...


thanks m8, I will give it a go.

Jul 23 '05 #3

"Cheddar" <my************ *@dsl.pipex.com > a écrit dans le message de
news:c5******** ****@ID-179732.news.uni-berlin.de...
I'm having trouble creating a very simple running total of a
few drop down list. I have three seperate dropdown lists, I
want the user to simply select some numbers and have the
total of the selected numbers displayed.

I'm not much of a programmer and this is really just a
experiment. Can anyone help me out here. I know the code
below doesnt work (no form tags etx0 but I thought the logic
was fine?

Example of what I would like to happen

User selects 2,5,6 and a total of 13 is displayed somewhere
on the page. This total changes when the user picks
different numbers.

Can anyone help me out here?

------------------------------------------------------------
--------
Code

</head>
<script language="javas cript">
function workit()
{
var itemA=document. select.value
var itemB=document. select2.value
var itemC=document. select3.value
var total = itemA+itemB+ite mC;
Try this instead:
function workit()
{
var itemA = parseInt(select .options[select.selected Index].value);
var itemB = parseInt(select 2.options[select2.selecte dIndex].value);
var itemC = parseInt(select 3.options[select3.selecte dIndex].value);

var total = itemA + itemB + itemC;
mytotal.innerHT ML = total;
}
}
</script>
<body>
<p>
<select name="select" onChange="worki t()">
<option value="1" selected>One</option>
<option value="2">Two</option>
<option value="3">Three </option>
</select>
<select name="select2" onChange="worki t()">
<option value="4" selected>Four</option>
<option value="5">Five</option>
<option value="6">Six</option>
</select>
<select name="select3" onChange="worki t()">
<option value="7" selected>Seven</option>
<option value="8">Eight </option>
<option value="9">Nine</option>
</select>
</p>
<p><span id=mytotal></span></p>
</body>
</html>

Jul 23 '05 #4
Morris wrote:
Try this instead:
function workit()
{
var itemA = parseInt(select .options[select.selected Index].value); var itemB =
parseInt(select 2.options[select2.selecte dIndex].value); var
itemC = parseInt(select 3.options[select3.selecte dIndex].value);

var total = itemA + itemB + itemC;
mytotal.innerHT ML = total;
}


Good stuff, thanks a lot.


Jul 23 '05 #5
JRS: In article <0k************ ********@wagner .videotron.net> , seen in
news:comp.lang. javascript, Morris <mo********@eud oramail.com> posted at
Wed, 14 Apr 2004 17:47:39 :

Try this instead:
function workit()
{
var itemA = parseInt(select .options[select.selected Index].value);


But only after considering whether the string .value might have a
leading zero, and what (a) might happen, (b) is needed, in that case.

Read the FAQ.

--
© John Stockton, Surrey, UK. ?@merlyn.demon. co.uk Turnpike v4.00 IE 4 ©
<URL:http://jibbering.com/faq/> Jim Ley's FAQ for news:comp.lang. javascript
<URL:http://www.merlyn.demo n.co.uk/js-index.htm> jscr maths, dates, sources.
<URL:http://www.merlyn.demo n.co.uk/> TP/BP/Delphi/jscr/&c, FAQ items, links.
Jul 23 '05 #6

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