PHP and JAVASCRIPT, DIFFICULT

Anon

Hi,

I am going crazy with the following:
I generate dynamically a little php-form

<INPUT type="text" name=<?php echo "qty[".$item_no[$x]."]"; ?> size="4" maxlength="4" onChange="check_field(this,0,250,'message')">

When I call the javascript I can check whether the input is in the range between 0 and 250 but I AM TOTALLY UNABLE to focus on that field. I already tried

window.document.forms[0].elements['qty[]'].focus();

but it always puts the focus on the next field. The problem seems to be the fact that the field is not only qty[] in the PHP-Code but indexed with $item_no[0] !!!

I could find anything about this special problem. Any specialists out there ???

Kind regards from Germany

CAROLA

Anon

The problem is not unknown...You cannot reference variable names containing [ or ] in javascript. but you can get around it a couple of different ways. One would be to simply append the value in $item_no[$x] to the variable name, so that it becomes (for example) qty28765. This is a valid name which can be easily addressed in Javascript. Another way would be to use the elements method, as you have done, but you cannot use qty[] as the index. You would probably need to pass the numeric value into the check_field function, so that the proper element number was assigned. If this doesnt make sense, or you would like to see some examples, feel free to let me know.

Good Luck!
Darren

Anon

Hi Darren,

thank your for your answer.

I understand soluation 1, but I need qty as an array like qty to scan it afterwards on the next page to set cookies.

Solution 2 I don't understand (pass a numeric field) to the javascript. Can I do something like windows.document.form[0].element[<?PHP echo $i ; ?> ????

Thanks again !

Kind regards

CAROLA

Anon

OK...Im fairly confused, but I think the following may help.

Then again, I could be a complete loon...🙂

<head>
<title>Untitled</title>
</head>
<script language = "javascript">
function isaPosNum(s){
return (parseInt(s) > 0);
}
function testsize(item,min,max,junk,elementnumber){
var returnval = false;
if(!isaPosNum(item.value)){
alert('Please enter a positive number');
window.document.forms[0].elements[elementnumber].focus();
}else if(parseInt(item.value) < min){
alert ('Please enter a number greater than ' + min);
window.document.forms[0].elements[elementnumber].focus();
}else if(parseInt(item.value) > max){
alert ('Please enter a number less than ' + max);
window.document.forms[0].elements[elementnumber].focus();
}else{
returnval = true;
}
return returnval;
}
</script>
<body>

Anon

That really helped !

Thank you for all your effort !

Kind regards

CAROLA