php and javascript problem

[ashay]

I have a code in which there are array names for text boxes...the code looks like this

 echo "<td><input type=text size=13 name=\"quantity[$i]\"></td>\n";
echo "<td><input type=text size=13 name=\"production[$i]\"></td>\n";
echo "<td><input type=text size=13 name=\"extAmt[$i]\" onFocus=\"addExtAmt($i);\"></td>\n";
[code=php]

i want to calculate the extAmt value depending on the values in quantity[] and production[]. i.e extAmt = quantity * production.

i would do it if they were staright variables...but does anybody know how do to it when ure variables are arrays..

I came up with some solution, but its not working..if u think I am in right direction, just let me know where I am wrong

my javascript is

function addExtAmt(count){
var varu;
qtEl = document.frm.elements['quantity[]'];
prEl = document.frm.elements['production[]'];
eaEl = document.frm.elements['extAmt[]'];
varu = ((parseInt(document.frm.qtEl[count].value))*(parseFloat(document.frm.prEl[count].value)));
varu = round(varu);
document.frm.eaEl[count].value = varu;
}


Regards,
Ashay

[icaro]

hi there

to use this form objects you must set their id's without [] or any special simbol:

<input type="text" name="formname[]" id="formname<?=$i?>_" size="21" maxlength="20">

at javascript source you can use:

var js_obj = document.getElementById("formname<?=$i?>");
var obj_value = js_obj.value;
// or formname0, formanem1_ and so on..

note that '_' at the end of id name.. I used to have problems in moozzilla with numbers as last character in form's name's. so, use some diferent simbol or letter
and the $i in form's name is optional, will make no difference to js

hope that helps you,
have fun
[]
icaro

[Weedpacket]

See also here and the user notes here.

[ashay]

I tried ure method (first reply), but I cannot in any way transfer that $i to my javascript as it is in another file.

I do this
echo "<td><input type=text size=13 name=\"quantity[$i]\" id=\"quantity$i\"></td>\n";
echo "<td><input type=text size=13 name=\"production[$i]\" id=\"production$i\"></td>\n";
echo "<td><input type=text size=13 name=\"extAmt[$i]\" id=\"extAmt_$i\" onFocus=\"addExtAmt($i);\"></td>\n";

and the javascript i wrote is this:

function addExtAmt(count){
var varu;
var temp = count;
var qtObj = document.getElementById("quantity_temp");
var qt_value = qtObj.value;
var prObj = document.getElementById("production_temp");
var pr_value = prObj.value;
varu = ((parseInt(qt_value))*(parseFloat(pr_value)));
varu = round(varu);
var exObj = document.getElementById("extAmt_temp");
exObj.value = varu;
}

but its not working

please help..
ashay

[epimeth]

getElementById("quantity_" + temp);