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SecretSanta form to select random friend to gift
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| <?php | |
| if(isset($_POST['submit'])) { | |
| handleForm(); | |
| } | |
| else { | |
| displayForm(); | |
| } | |
| function displayForm() { | |
| $html = '<html> | |
| <head> | |
| <title>Secret Santa Sorter</title> | |
| <style> | |
| .participant:nth-child(-n+2) a{display: none} | |
| </style> | |
| <script type="text/javascript"> | |
| function addParticipant() { | |
| var el = document.getElementsByClassName("participant")[0].cloneNode(true); | |
| var inputs = el.getElementsByTagName("input"); | |
| for(i in inputs) { | |
| inputs[i].value = ""; | |
| } | |
| document.getElementById("participants").appendChild(el); | |
| } | |
| function removeParticipant(participant) { | |
| var index = Array.prototype.slice.call(document.getElementsByClassName("participant")).indexOf(participant); | |
| participant.parentNode.removeChild(participant); | |
| var parts = document.getElementsByClassName("participant"), select; | |
| for(var i = 0; i < parts.length; i++) { | |
| select = parts[i].getElementsByTagName("select")[0]; | |
| if(parseInt(select.options[select.selectedIndex].value, 10) === index) { | |
| select.selectedIndex = 0; | |
| } | |
| for(var j = 0; j < select.options.length; j++) { | |
| if(parseInt(select.options[j].value, 10) === index) { | |
| select.removeChild(select.options[j]); | |
| break; | |
| } | |
| } | |
| } | |
| } | |
| function updateParticipant(participant) { | |
| var index = Array.prototype.slice.call(document.getElementsByClassName("participant")).indexOf(participant); | |
| var parts = document.getElementsByClassName("participant"), select, option, founded; | |
| for(var i = 0; i < parts.length; i++) { | |
| if(i === index) continue; | |
| select = parts[i].getElementsByTagName("select")[0]; | |
| founded = false; | |
| for(var j = 0; j < select.options.length; j++) { | |
| if(parseInt(select.options[j].value, 10) === index) { | |
| select.options[j].text = participant.getElementsByTagName("input")[0].value; | |
| founded = true; | |
| } | |
| } | |
| if(!founded) { | |
| option = document.createElement("option"); | |
| option.value = index; | |
| option.text = participant.getElementsByTagName("input")[0].value; | |
| select.appendChild(option); | |
| } | |
| } | |
| } | |
| </script> | |
| </head> | |
| <body>'; | |
| $html .= '<form action="" method="post"> | |
| <fieldset> | |
| <legend>Participants Details</legend> | |
| <ol id="participants">'; | |
| $html .= ' <li class="participant"> | |
| <input type="text" name="name[]" required="required" placeholder="Name Surname" onblur="updateParticipant(event.target.parentNode)" /> | |
| <input type="email" name="email[]" required="required" placeholder="Email" /> | |
| <a href="" onclick="removeParticipant(event.target.parentNode.parentNode);return false;"><img src="https://cdn1.iconfinder.com/data/icons/realistiK-new/16x16/actions/edit_remove.png" /></a> | |
| <select name="partner[]"><option value="" disabled="disabled" selected="selected">Partner</option></select> | |
| </li> | |
| <li class="participant"> | |
| <input type="text" name="name[]" required="required" placeholder="Name Surname" onblur="updateParticipant(event.target.parentNode)" /> | |
| <input type="email" name="email[]" required="required" placeholder="Email" /> | |
| <a href="" onclick="removeParticipant(event.target.parentNode.parentNode);return false;"><img src="https://cdn1.iconfinder.com/data/icons/realistiK-new/16x16/actions/edit_remove.png" /></a> | |
| <select name="partner[]"><option value="" disabled="disabled" selected="selected">Partner</option></select> | |
| </li>'; | |
| $html .= ' </ol> | |
| <a href="" onclick="addParticipant();return false;"><img src="https://cdn2.iconfinder.com/data/icons/splashyIcons/add_small.png" alt="+" title="Add new participant" /></a><br /> | |
| <input type="submit" name="submit" value="Randomize" />'; | |
| $html .= ' </fieldset> | |
| </form> | |
| </body> | |
| </html>'; | |
| echo $html; | |
| } | |
| function handleForm() { | |
| $participants = array(); | |
| for($i=0;$i<count($_POST['name']);$i++) { | |
| $participants[$i] = array('name' => $_POST['name'][$i], 'email' => $_POST['email'][$i], 'partner' => isset($_POST['partner'][$i]) ? $_POST['partner'][$i] : null); | |
| } | |
| $hat = array_keys($participants); | |
| foreach($participants as $i => $participant) { | |
| if(count($hat) !== 2 or !in_array($i+1, $hat)) { | |
| $userHat = array_diff($hat, array($i, $participant['partner'])); | |
| $secretSanta = $userHat[array_rand($userHat)]; | |
| $participants[$i]['secretsanta'] = $secretSanta; | |
| $hat = array_diff($hat, array($secretSanta)); | |
| } else { | |
| // Special case, participants A,B,C, A picked B then B can pick either A or C but if B picks A, then C can only pick C | |
| // So check if next participant left is in the hat. If so, force. If no, random. | |
| $participants[$i]['secretsanta'] = $i+1; | |
| $hat = array_diff($hat, array($i+1)); | |
| } | |
| echo $participants[$i]['name']." => ".$participants[$participants[$i]['secretsanta']]['name']."<br />"; | |
| } | |
| } |
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