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Lytter med

felter der ikke er udfyldt vil blive talt som 0:

oppe i head en <script section:
<script language=\'javascript\'> <!--
function docalc( ) {
    frm = document.forms[\'dinform\'].elements;
    var plus = 0;
    for (i=0; 5>=i; i++) plus += parseInt( \"0\"+frm[\"plus\"+i].value );
    var minus = 0;
    for (i=0; 15>=i; i++) minus += parseInt( \"0\"+frm[\"minus\"+i].value );
    frm[\'resultat\'],value = plus-minus;
}; //end docalc()
// --> </script>

og nede i body din formular:
<form name=\"dinform\" ... >

<input type=\'text\' name=\'plus1\' value=\"\" onblur=\"docalc()\">
<input type=\'text\' name=\'plus2\' value=\"\" onblur=\"docalc()\">
<input type=\'text\' name=\'plus3\' value=\"\" onblur=\"docalc()\">
<input type=\'text\' name=\'plus4\' value=\"\" onblur=\"docalc()\">
<input type=\'text\' name=\'plus5\' value=\"\" onblur=\"docalc()\">

<input type=\'text\' name=\'minus1\' value=\"\" onblur=\"docalc()\">
<input type=\'text\' name=\'minus2\' value=\"\" onblur=\"docalc()\">
<input type=\'text\' name=\'minus3\' value=\"\" onblur=\"docalc()\">
<input type=\'text\' name=\'minus4\' value=\"\" onblur=\"docalc()\">
<input type=\'text\' name=\'minus5\' value=\"\" onblur=\"docalc()\">
<input type=\'text\' name=\'minus6\' value=\"\" onblur=\"docalc()\">
<input type=\'text\' name=\'minus7\' value=\"\" onblur=\"docalc()\">
<input type=\'text\' name=\'minus8\' value=\"\" onblur=\"docalc()\">
<input type=\'text\' name=\'minus9\' value=\"\" onblur=\"docalc()\">
<input type=\'text\' name=\'minus10\' value=\"\" onblur=\"docalc()\">
<input type=\'text\' name=\'minus11\' value=\"\" onblur=\"docalc()\">
<input type=\'text\' name=\'minus12\' value=\"\" onblur=\"docalc()\">
<input type=\'text\' name=\'minus13\' value=\"\" onblur=\"docalc()\">
<input type=\'text\' name=\'minus14\' value=\"\" onblur=\"docalc()\">
<input type=\'text\' name=\'minus15\' value=\"\" onblur=\"docalc()\">

<input type=\'text\' name=\'resultat\' value=\"\" onfocus=\"this,blur()\">

<form>

mvh JakobA

Ups. og naturligvis en fejl. de to for løkker skal starte med 1
...
    for (i=1; 5>=i; i++) plus += parseInt( \"0\"+frm[\"plus\"+i].value );
    var minus = 0;
    for (i=1; 15>=i; i++) minus += parseInt( \"0\"+frm[\"minus\"+i].value );
...

Jeg kan ikke få det til at virke.
Den viser ikke resultatet.

Min fejl. jeg havde skrevet , istedet for punktum i linien
    frm[\'resultat\'].value = plus-minus;

Og fandt lige endnu een. gentager lige det hele emd alle rettelser:

oppe i head en <script section:
<script language=\'javascript\'> <!--
function docalc( ) {
    frm = document.forms[\'dinform\'].elements;
    var plus = 0;
    for (i=1; 5>=i; i++) plus += parseInt( \"0\"+frm[\"plus\"+i].value );
    var minus = 0;
    for (i=1; 15>=i; i++) minus += parseInt( \"0\"+frm[\"minus\"+i].value );
    frm[\'resultat\'].value = plus-minus;
}; //end docalc()
// --> </script>

og nede i body din formular:
<form name=\"dinform\" ... >

<input type=\'text\' name=\'plus1\' value=\"\" onblur=\"docalc()\">
<input type=\'text\' name=\'plus2\' value=\"\" onblur=\"docalc()\">
<input type=\'text\' name=\'plus3\' value=\"\" onblur=\"docalc()\">
<input type=\'text\' name=\'plus4\' value=\"\" onblur=\"docalc()\">
<input type=\'text\' name=\'plus5\' value=\"\" onblur=\"docalc()\">

<input type=\'text\' name=\'minus1\' value=\"\" onblur=\"docalc()\">
<input type=\'text\' name=\'minus2\' value=\"\" onblur=\"docalc()\">
<input type=\'text\' name=\'minus3\' value=\"\" onblur=\"docalc()\">
<input type=\'text\' name=\'minus4\' value=\"\" onblur=\"docalc()\">
<input type=\'text\' name=\'minus5\' value=\"\" onblur=\"docalc()\">
<input type=\'text\' name=\'minus6\' value=\"\" onblur=\"docalc()\">
<input type=\'text\' name=\'minus7\' value=\"\" onblur=\"docalc()\">
<input type=\'text\' name=\'minus8\' value=\"\" onblur=\"docalc()\">
<input type=\'text\' name=\'minus9\' value=\"\" onblur=\"docalc()\">
<input type=\'text\' name=\'minus10\' value=\"\" onblur=\"docalc()\">
<input type=\'text\' name=\'minus11\' value=\"\" onblur=\"docalc()\">
<input type=\'text\' name=\'minus12\' value=\"\" onblur=\"docalc()\">
<input type=\'text\' name=\'minus13\' value=\"\" onblur=\"docalc()\">
<input type=\'text\' name=\'minus14\' value=\"\" onblur=\"docalc()\">
<input type=\'text\' name=\'minus15\' value=\"\" onblur=\"docalc()\">

<input type=\'text\' name=\'resultat\' value=\"\" onfocus=\"this.blur()\">

<form>

Det hjalp, men der er en fejl.
Hvis jeg skriver 10 i de fem plus felter, trækker den kun værdien 8 ud af felterne. DVS 5x10=40?

Den har et stort problem med nuller (som i 1000 eller 5000 o.s.v.)

een gang til :(  parseInt skulle have specificeret rasix 10

    for (i=1; 5>=i; i++) plus += parseInt( \"0\"+frm[\"plus\"+i].value, 10 );
    var minus = 0;
    for (i=1; 15>=i; i++) minus += parseInt( \"0\"+frm[\"minus\"+i].value, 10 );

Det virker for fedt.

TAK