Radio Buttons and Checkboxes Not posting

[FrustratedFlash]

Hello everyone,

I am hoping some PHP expert out there can help this newbie with the problem I am having.

I have a form with textfields, checkboxes, and radio buttons. These value are submitted using the POST method to another php page. The problem is if a checkbox is not checked or a radio button in a group is not selected, then nothing shows up in the corresponding $_POST array. By nothing I mean the checkbox or radio button name is not present in the array. I don't understand this.

Here is how I am creating the checkboxes and radio buttons.

<INPUT type=RADIO name=\"q1\" value=\"2\">2

<INPUT type=RADIO name=\"q20\" value=\"Yes\">Yes

Any help with this problem would be greatly appreciated.

[twanvl]

That is how radio buttons and checkboxes work, if they are checked/selected they are present in $_POST/$_GET, otherwise they are not.

[FrustratedFlash]

Thanks twanvl,

I have found a way to get around the problem. I have another question though. I need to know when a textarea comes in empty. What is the value of an empty textfield? I have tried using "" and NULL, but that doesnt seem to work.

if ($temp != NULL) {
print $temp;
}

Still prints

Thanks

[twanvl]

if a textarea is empty it's value should =="" and also ==="". How can you see that it prints if it prints an empty string?

[FrustratedFlash]

Hi twanvl,

I can't actually see the empty string printing, but the value for the field is printing. The field name is only supposed to show up if there is an entry.

(like this)

Field Name: "The field text"

if there is no text in the field then I should get nothing, but instead I get

Field Name: <nothing>

I have found a work around though. Instead of checking for "" or null, I just check to see if the length of the string is equal to 0.

Thanks for all of your help

[visualAd]

If you want to force a value for a particular field, use a hidden input tag.

<input tyoe="hidden" name="q1" value="undefined" />
<input type="radio" name="q1" value="2">2

<input type="radio" name="q20" value="Yes">Yes

If the use doesn't select a radio button, then the hidden field value provails and gets sent through, if they do, the value of the radio button selected is submitted instead.