skins/ajax_scripts/input_completion.js

   1 // © Benoît PIN 2008
   2 // http://plinn.org
   3 // Licence GPL
   4 //
   5 //
   6 // Form completion utils
   7
   8 // public names
   9 var TextInputCompletion;
  10
  11 (function(){
  12
  13 UID_ATTEMPT = 8;
  14
  15 TextInputCompletion = function(input, url) {
  16         this.url = url;
  17         this.input = input;
  18         this.previousValue = this.input.value;
  19
  20         var thisManager = this;
  21         addListener(this.input, 'keyup', function(evt) { thisManager._inputComplete(evt); });
  22         addListener(this.input, 'blur', function(evt) {thisManager._inputQuit(evt);});
  23         this.input.cancelNextSubmit = true;
  24
  25         var uid;
  26         for (var i=0 ; i<UID_ATTEMPT ;i++) {
  27                 uid = Math.random().toString().slice(2);
  28                 uid = 'completions' + uid;
  29                 if (!document.getElementById(uid))
  30                         break;
  31         }
  32
  33         var completions = document.createElement('div');
  34         completions.id = uid;
  35         completions.style.position = 'relative';
  36         completions.style.top = getObjectHeight(input) + 'px';
  37
  38         var parent = input.parentNode;
  39         parent.insertBefore(completions, input);
  40
  41         this.completions = completions;
  42         addListener(this.completions, 'click',
  43                                 function(evt){thisManager.selectCompletion(getEventObject(evt));}
  44                                 );
  45         this.selectedCompletion = null;
  46 }
  47
  48
  49 TextInputCompletion.prototype._inputComplete = function(evt) {
  50         var currentValue = this.input.value;
  51         if (currentValue == this.previousValue)
  52                 this.selectCompletion(getEventObject(evt));
  53         else {
  54                 var url = this.url + '?value=' + encodeURIComponent(currentValue);
  55                 url = url + '&uid=' + this.completions.id;
  56                 var thisManager = this;
  57                 var fi = new FragmentImporter(url, function(){thisManager.completeIfOneResult() })
  58                 fi.load();
  59         }
  60 };
  61
  62 TextInputCompletion.prototype._inputQuit = function(evt) {
  63         if (this.selectedCompletion) {
  64                 try {
  65                         this.copyCompletion(this.selectedCompletion);
  66                 }
  67                 catch(e){}
  68         }
  69         this.selectedCompletion = null;
  70         thisCompleter = this
  71         setTimeout(function(){thisCompleter.completions.innerHTML='';}, 200);
  72 };
  73
  74 TextInputCompletion.prototype.selectCompletion = function(evt) {
  75         var res = this.completions.getElementsByTagName('li');
  76         if (!res) return;
  77
  78         if (evt.type == 'keyup') {
  79                 var newSelection = false;
  80                 switch(evt.keyCode) {
  81                         case 40: // down key
  82                                 if (!this.selectedCompletion) {
  83                                         this.selectedCompletion = res[0];
  84                                         newSelection = true;
  85                                 }
  86                                 else if (this.selectedCompletion.nextSibling) {
  87                                         this.selectedCompletion.className = '';
  88                                         this.selectedCompletion = this.selectedCompletion.nextSibling;
  89                                         newSelection = true;
  90                                 }
  91                                 break;
  92                         case 38: // up key
  93                                 if (this.selectedCompletion && this.selectedCompletion.previousSibling) {
  94                                         this.selectedCompletion.className = '';
  95                                         this.selectedCompletion = this.selectedCompletion.previousSibling;
  96                                         newSelection = true;
  97                                 }
  98                                 break;
  99                         case 13: // enter key
 100                                 if (this.selectedCompletion) {
 101                                         this.copyCompletion(this.selectedCompletion);
 102                                         this.completions.innerHTML = '';
 103                                         this.input.cancelNextSubmit = true;
 104                                         return;
 105                                 }
 106                                 break
 107                 }
 108                 if (newSelection) {
 109                         this.selectedCompletion.className = 'selected';
 110                         this.copyCompletion(this.selectedCompletion);
 111                 }
 112         }
 113         else if (evt.type=='click') {
 114                 this.selectedCompletion = getTargetedObject(evt);
 115                 this.copyCompletion(this.selectedCompletion);
 116         }
 117 }
 118
 119 TextInputCompletion.prototype.copyCompletion = function(completion) {
 120         this.input.value = this.previousValue = completion.firstChild.nodeValue;
 121 }
 122
 123 TextInputCompletion.prototype.completeIfOneResult = function() {
 124         this.selectedCompletion = null;
 125         var currentValue = this.input.value;
 126
 127         if (this.previousValue.length < currentValue.length) {
 128                 var res = this.completions.getElementsByTagName('li');
 129                 if (res.length == 1) {
 130                         var completion = res[0];
 131                         this.copyCompletion(completion);
 132                         this.completions.innerHTML = '';
 133                 }
 134         }
 135
 136         this.previousValue = currentValue;
 137 };
 138
 139 })();