php form validation with javascript?

[mlaba1]

Hi all,
I'm not sure I have this right but here goes....I have a php page which displays a few rows of data. Next to each row is a radio button. At the bottom of the form is an edit and delete button. When my user clicks the edit or delete button I want to make sure my user has selected a radio button (javascript?) and pass the radio button index returned from that method to a session variable before I submit the form. A snippet of code:
<td align=center><input type=button name=up value=\" Edit \" onClick=\"getSelectedRadio(this.form.radio)\">
This is my edit button. Can someone fix this code so that it sets the seesion variable and does the submit...I can't get it?

[LordShryku]

Validation through javascript can N_E_V_E_R be trusted. It's too easy to bypass or just turn off. It's fine to do it, but you should check in PHP also. Now, it looks like you have a custom javascript written for this (getSelectedRadio(var)). we'd need to see that also to help you.

[mlaba1]

certainly....
// returns the array number of the selected radio button or -1 if no button is selected

function getSelectedRadio(buttonGroup) {

// if the button group is an array (one button is not an array)
if (buttonGroup[0])
{
for (var i=0; i<buttonGroup.length; i++)
{
if (buttonGroup.checked)
{
alert(i);
return i
}
}
}
else
{
// if the one button is checked, return zero
if (buttonGroup.checked)
{
alert(0);
return 0;
}
}

// no radio button is selected
alert("You must select the radio control of the record to edit.");
return -1;
}

I need to validate the data prior to the submit, otherwise I wouldn't bother. BTW, my thinking is to set the index to a $_SESSION var and then post the form. Can I do that ?

[LordShryku]

Originally posted by mlaba1
I need to validate the data prior to the submit, otherwise I wouldn't bother.

How do you plan to handle people who have javascript disabled?

[mlaba1]

new idea...I'm going to test to make sure the user has selected a radio button using javascript. If the value returned isn't -1 then I want to submit the form. I've decided to add the record ID to the value of the radio button as a $_SESSION varaible. So, does the variable thing sound good and how would I exactly submit the form depending on the return value of the javascript function?
whadayathink?