I will try your method.
I have found a way to solved this problem of mine.
I have four fields I may or may not choose to fill up one out of the four
fields, or I might filled up all of them.
So when I leave one or two fields empty, and add all the value up, I will
get NaN.
For those empty fields, it would be better to check and see whether it is
blank, e.g. if (field1 == '') { field=0; }
And then add them all up from there.
Riccardi Moreno wrote:
> Try this:
>
> The HTML codes should look like this:
> <input type="text" name="field[]" onChange="add();">
> <input type="text" name="field[]" onChange="add();">
> <input type="text" name="field[]" onChange="add();">
> <input type="text" name="field[]" onChange="add();">
> <input type="text" name="totalsum">
>
> function add() {
> var total = 0;
> var thisform = document.forms[0];
> for (i=0;i<=thisform.elements["field[]"].length;i++) {
> if (!isNaN(thisform.elements["field[]"].value) total +=
> thisform.elements["field[]"].value;
> }
> thisform.totalsum.value=total;
> }
>
> -----Messaggio originale-----
> Da: Shahmat Dahlan [mailto:shahmatd@sains.com.my]
> Inviato: venerdi 11 ottobre 2002 11.35
> A: php-db@lists.php.net
> Oggetto: Javascript
>
> My question might have anything to do with PHP but I have the following
> scenario:
>
> Say I have four fields
> field1 : XXXXXXXXXXXX
> field2 : XXXXXXXXXXXX
> field3 : XXXXXXXXXXXX
> field4 : XXXXXXXXXXXX
>
> And a total sum field, which is a total sum of the value of the
> expression, totalsum = field1 + field2 + field3 + field4
> Total sum : XXXXXXXXXXX
>
> You would need to use Javascript to extract the value of field1, field2,
> field3, field4, initiated by the Javascript onChange event.
>
> The HTML codes should look like this:
> <input type="text" name="field1" addChange="add();">
> <input type="text" name="field2" addChange="add();">
> <input type="text" name="field3" addChange="add();">
> <input type="text" name="field4" addChange="add();">
> <input type="text" name="totalsum">
>
> So the add function snippet that I have:
>
> function add()
> {
> var thisform=document.forms[0];
> var field1=thisform.field1.value;
> var field2=thisform.field2.value;
> var field3=thisform.field3.value;
> var field4=thisform.field4.value;
> var totalqty=field1+field2+field3+field4;
> thisform.totalsum.value=totalqty;
> }
>
> But all I got is a NaN which means Not A Number. I understand that you
> solve this by using the parseInt Javascript function.
> But still all i get is a NaN value.
>
> Would appreciate if someone could help me out on this.
>
> Regards
>
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