[RESOLVED] extracting data from javascript to php

nisrin

This is a piece of code in javascript, embedded in html, for the order page on an ecommerce site that i have made. I have this particular script nested inside a <form> tag and have set the action to a php file, but the tricky part is to extract the data from the javascript code and to post these variables into a php files, because their values...So i put in this data in textboxes with names that change according to the counter and have made the type hidden. The code is below:

//JAVASCRIPT
if (parent.item_num > 0){
for (i =1;i < parent.item_num;i++){
if (parent.itemlist.quan > 0){
index = index + 1;
document.write('<input size=35 type=hidden name=c+i value= ' + parent.itemlist.code + '>'+'<input size=3 type=hidden name=p+i value=' + parent.itemlist.price + '>'+'<input size=18 type=hidden name=d+i value= '+ parent.itemlist.desc + '>'+'<input size=3 type=hidden name=q+i value= '+ parent.itemlist.quan + '><br/>');
}
}
}

The piece of code in php meant to handle the script is
<?php

$prod_name[]= "";
$prod_price[]= "";
$prod_painter[]= "";
$prod_quantity[]="";

//assuming that only 10 products are ordered...
for($i=1;$i<=10;$i++)
{
$prod_name[$i] = $POST['c'+$i];
$prod_price[$i]= $POST['p'+$i];
$prod_painter[$i] = $POST['d'+$i];
$prod_quantity[$i]= $POST['q'+$i];
}

for($i=0;$i<=10;$i++)
{
echo $prod_name[$i];
echo $prod_price[$i];
echo $prod_painter[$i];
echo $prod_quantity[$i];
}

?>

The problem is with the php codes, the javascript works fine, as for now I just want to get the data from js, I'll write it into a file later...

Thankyou so much..

samudasu

"+" is not a string concatenater (might not be a word) in php.

$_POST['c'+$i]

should be

$_POST['c'.$i]

nisrin

Thank you for that prompt reply......I got muddled up with the detail that the concatenation string is '.' in php and '+' in javascript........

But Im still getting errors:

Notice: Undefined index: c1
Notice:Undefined index: p1
Notice: Undefined index: d1
Notice: Undefined index: q1

The parser is not identifying these variables for some reason, is there a solution to this, or a better alternative?

Thank you again.

samudasu

Alright, i guess there's really no need for concatenation. See if this works.

$_POST["c$i"];

nisrin

I tried it but that doesnt work either!! It displays the same errors..

Is there any way to work around this?

Thanks..

samudasu

Most likely your the form values aren't being passed to php. Run the php code at the beginning of your php script. If you're getting any values from the form, you'll be able to see the key => value pairs similar to below.

Array
(
    [c1] => cvalue
    [p1] => pvalue
    [d1] => dvalue
    [q1] => qvalue
)

<?php
print "<pre>";
print_r($_POST);
print "</pre>";

Weedpacket

You'll also get those errors unless exactly ten items are ordered. If there are fewer items, then the additional fields won't be defined. Always use at least [man]isset[/man] on form fields before trying to use them, because you can't guarantee that they'll be there (and if they aren't, you'll be told about it, as you've discovered).

And another observation: You're sure that those hidden input fields are being written inside the form? Can't tell from what you've posted.

More importantly, you've made a mistake when writing the form field names. You have fields named "c+i" and so on (as you've probably found now that you've used print_r() as samudasu suggested), because the "+i" is inside the string, not outside, so Javascript doesn't see it as any sort of string concatenation (not having a + after the i should have looked strange).

And you've forgotten to quote your attribute values.

And note that you can have the form fields passed as an array to simplify working with all those fields (like, you could then have $prod_price = $_POST['p'].)

nisrin

The php codes work fine now...

As you suggested Samadasu, my javascript had errors in it and wasnt passing the data from the variables.

Weedpacket, my input text is written to the form despite being hidden, but you were right about using isset for arrays.

Thank you both!! ... 🙂

wanted1234

hi..same script in java . same problem here as well... sorry to dig this up again after 6 yrs... but being a novice in programming ... i ve no idea how this can be done... so Nisrin if could help me with the mail php and the changes in javascript.... i would be really thakful....

nisrin

hey there.. I'm sorry, I really do wish I could help you.. but like you said it was a long time ago, and Ive gotten rusty in codes.. do open a new thread, you'll get your answers..

Good luck!!