Ad:

PHP Discussion Thread
Unsolved
Views: 2438

Sep 15th, 2008

Many checkboxes in form, how do I check which ones are checked?

Expand Post »

I am making a section in the users' profile where they pick their favorite teams, which might be in different leagues (NCAA, MLB, NFL).

When the user picks the league, it takes them to the next page that lists the teams under their respective conferences (Big 10, Big 12, NFC, AFC, National League, American League, etc.)

Each team has a checkbox, so that they can pick more than one favorite team.

My dilemma is on the action page, how do I figure out which teams have been checked? Do I have to send a field containing the number of teams in the league, and then do a loop through each one to see if the current team in the loop was checked, or is there an easier way?

Thanks

Similar Threads

how to validate checkbox with different names? in HTML and CSS
Problem in checkboxes set in C#
Check the state of a check box from a different form in VB.NET
Validating a Check Box in JavaScript / DHTML / AJAX
checkboxes / enabling fields in Visual Basic 4 / 5 / 6

Diode

Reputation Points: 50

Solved Threads: 0

Junior Poster in Training

Offline

70 posts
since Jan 2005

Permalink

Sep 15th, 2008

Re: Many checkboxes in form, how do I check which ones are checked?

I forgot to include that I am using a form, with the POST method.

Diode

Reputation Points: 50

Solved Threads: 0

Junior Poster in Training

Offline

70 posts
since Jan 2005

Permalink

Sep 15th, 2008

Re: Many checkboxes in form, how do I check which ones are checked?

Make sure all your form elements have the same name value with an empty bracket.
ie

html Syntax (Toggle Plain Text)
<input type="checkbox" name="checked[]" value="dog" />Dog
<br />
<input type="checkbox" name="checked[]" value="cat" />Cat
<input type="checkbox" name="checked[]" value="dog" />Dog
<br />
<input type="checkbox" name="checked[]" value="cat" />Cat

Then, in your processing script, just loop through the checkbox array and do what you need to inside the loop.

php Syntax (Toggle Plain Text)
foreach($_POST['checked'] as $value){
//do whatever here. I'll just print the values but you can update the db, push into an array, or whatever here.
print $value;
print "<br />";
}
foreach($_POST['checked'] as $value){
//do whatever here. I'll just print the values but you can update the db, push into an array, or whatever here.
print $value;
print "<br />";
}

buddylee17

Reputation Points: 232

Solved Threads: 137

Practically a Master Poster

Offline

665 posts
since Nov 2007

Permalink

Sep 16th, 2008

Re: Many checkboxes in form, how do I check which ones are checked?

To add a to buddylee's post.
Note that if a checkbox isn't checked, it will not be sent, and will therefore not be included in the $_POST array.
(May seem obvious, but there is no harm in stating the obvious

)

Atli

Reputation Points: 93

Solved Threads: 70

Posting Pro

Offline

526 posts
since May 2007

Permalink

Sep 16th, 2008

Re: Many checkboxes in form, how do I check which ones are checked?

That's a helpful thing to remember Atli. Also just for future reference, let's say you have some checkboxes such as the following:

PHP Syntax (Toggle Plain Text)
<fieldset>
  <legend>Optionals (Un-Related Checkboxes):</legend>
  <label for="mailingList">I would like to be added to your mailing list:</label>
  <input type="checkbox" name="mailingList" id="mailingList" value="Yes" /> 
  <br />
  <label for="thirdParty">I agree to my details being passed onto third parties:</label>
  <input type="checkbox" name="thirdParty" id="thirdParty" value="Yes" /> 
</fieldset>
<fieldset>
  <legend>Optionals (Un-Related Checkboxes):</legend>
  <label for="mailingList">I would like to be added to your mailing list:</label>
  <input type="checkbox" name="mailingList" id="mailingList" value="Yes" /> 
  <br />
  <label for="thirdParty">I agree to my details being passed onto third parties:</label>
  <input type="checkbox" name="thirdParty" id="thirdParty" value="Yes" /> 
</fieldset>

These are simple check boxes and if the person doesn't want to sign up to anything, they don't check the box. As Atli said, this means that if they're not checked then they don't get sent to the processing script, so a helpful way of processing them if you need to use it in a MySQL table or in an email is this:

PHP Syntax (Toggle Plain Text)
      // If the user didn't choose to join the mailing list, set the variable to 'No' so it can be put into the database.
      if (!isset($_POST['mailingList'])) {
        $mailingList = "No";
      }
 
      // If the user didn't accept third parties, set the variable to 'No' so it can be put into the database.
      if (!isset($_POST['thirdParty'])) {
        $thirdParty = "No";
      }
      // If the user didn't choose to join the mailing list, set the variable to 'No' so it can be put into the database.
      if (!isset($_POST['mailingList'])) {
        $mailingList = "No";
      }

      // If the user didn't accept third parties, set the variable to 'No' so it can be put into the database.
      if (!isset($_POST['thirdParty'])) {
        $thirdParty = "No";
      }

Hope this helps!

Last edited by antwan1986; Sep 16th, 2008 at 6:27 am. Reason: Some Typos.#

antwan1986

Reputation Points: 14

Solved Threads: 8

Junior Poster

Offline

110 posts
since May 2008

This thread is more than three months old

No one has posted to this discussion for at least three months. Please let old threads die and do not reply to them unless you feel you have something new and valuable to contribute that absolutely must be added to make the discussion complete. Otherwise, please start a new thread in this forum instead.

Previous Thread in PHP Forum Timeline: Parse error: syntax error, unexpected T_STRING

Next Thread in PHP Forum Timeline: email

DaniWeb Message

Cancel Changes

User Name
Password