wolnelektury/media/js/jquery.autocolumn.js

   1 // version 1.1.0
   2 // http://welcome.totheinter.net/columnizer-jquery-plugin/
   3 // created by: Adam Wulf adam.wulf@gmail.com
   4
   5 (function($){
   6  $.fn.columnize = function(options) {
   7
   8
   9         var defaults = {
  10                 width: 400,
  11                 columns : false,
  12                 buildOnce : false
  13         };
  14         var options = $.extend(defaults, options);
  15
  16     return this.each(function() {
  17             var $inBox = $(this);
  18                 var maxHeight = $inBox.height();
  19                 var $cache = $('<div></div>'); // this is where we'll put the real content
  20                 var lastWidth = 0;
  21                 var columnizing = false;
  22                 $cache.append($inBox.children().clone());
  23
  24                 columnizeIt();
  25
  26                 $(window).resize(function() {
  27                         if(!options.buildOnce && $.browser.msie){
  28                                 if($inBox.data("timeout")){
  29                                         clearTimeout($inBox.data("timeout"));
  30                                 }
  31                                 $inBox.data("timeout", setTimeout(columnizeIt, 200));
  32                         }else if(!options.buildOnce){
  33                                 columnizeIt();
  34                         }else{
  35                                 // don't rebuild
  36                         }
  37                 });
  38
  39                 /**
  40                  * return a node that has a height
  41                  * less than or equal to height
  42                  *
  43                  * @param putInHere, a dom element
  44                  * @$pullOutHere, a jQuery element
  45                  */
  46                 function columnize($putInHere, $pullOutHere, $parentColumn, height){
  47                         while($parentColumn.height() < height &&
  48                                   $pullOutHere[0].childNodes.length){
  49                                 $putInHere.append($pullOutHere[0].childNodes[0]);
  50                         }
  51                         if($putInHere[0].childNodes.length == 0) return;
  52
  53                         // now we're too tall, undo the last one
  54                         var kids = $putInHere[0].childNodes;
  55                         var lastKid = kids[kids.length-1];
  56                         $putInHere[0].removeChild(lastKid);
  57                         var $item = $(lastKid);
  58                         if($item[0].nodeType == 3){
  59                                 // it's a text node, split it up
  60                                 var oText = $item[0].nodeValue;
  61                                 var counter2 = options.width / 8;
  62                                 var columnText;
  63                                 while($parentColumn.height() < height && oText.length){
  64                                         if (oText.indexOf(' ', counter2) != '-1') {
  65                                                 columnText = oText.substring(0, oText.indexOf(' ', counter2));
  66                                         } else {
  67                                                 columnText = oText;
  68                                         }
  69                                         $putInHere.append(document.createTextNode(columnText));
  70                                         if(oText.length > counter2){
  71                                                 oText = oText.substring(oText.indexOf(' ', counter2));
  72                                         }else{
  73                                                 oText = "";
  74                                         }
  75                                 }
  76                                 if(oText.length){
  77                                         $item[0].nodeValue = oText;
  78                                 }else{
  79                                         return;
  80                                 }
  81                         }
  82
  83                         if($pullOutHere.children().length){
  84                                 $pullOutHere.prepend($item);
  85                         }else{
  86                                 $pullOutHere.append($item);
  87                         }
  88                 }
  89
  90                 function split($putInHere, $pullOutHere, $parentColumn, height){
  91                         if($pullOutHere.children().length){
  92                                 $cloneMe = $pullOutHere.children(":first");
  93                                 $clone = $cloneMe.clone();
  94                                 if($clone.attr("nodeType") == 1){
  95                                         $putInHere.append($clone);
  96                                         if($clone.is("img") && $parentColumn.height() < height + 20){
  97                                                 $cloneMe.remove();
  98                                         }else if(!$cloneMe.hasClass("dontsplit") && $parentColumn.height() < height + 20){
  99                                                 $cloneMe.remove();
 100                                         }else if($clone.is("img") || $cloneMe.hasClass("dontsplit")){
 101                                                 $clone.remove();
 102                                         }else{
 103                                                 $clone.empty();
 104                                                 columnize($clone, $cloneMe, $parentColumn, height);
 105                                                 if($cloneMe.children().length){
 106                                                         split($clone, $cloneMe, $parentColumn, height);
 107                                                 }
 108                                         }
 109                                 }
 110                         }
 111                 }
 112
 113
 114                 function singleColumnizeIt() {
 115                         if ($inBox.data("columnized") && $inBox.children().length == 1) {
 116                                 return;
 117                         }
 118                         $inBox.data("columnized", true);
 119                         $inBox.data("columnizing", true);
 120
 121                         $inBox.empty();
 122                         $inBox.append($("<div class='first last column'></div>")); //"
 123                         $col = $inBox.children().eq($inBox.children().length-1);
 124                         $col.append($cache.clone());
 125
 126                         $inBox.data("columnizing", false);
 127                 }
 128
 129
 130                 function columnizeIt() {
 131                         if(lastWidth == $inBox.width()) return;
 132                         lastWidth = $inBox.width();
 133
 134                         var numCols = Math.round($inBox.width() / options.width);
 135                         if(options.columns) numCols = options.columns;
 136 //                      if ($inBox.data("columnized") && numCols == $inBox.children().length) {
 137 //                              return;
 138 //                      }
 139                         if(numCols <= 1){
 140                                 return singleColumnizeIt();
 141                         }
 142                         if($inBox.data("columnizing")) return;
 143                         $inBox.data("columnized", true);
 144                         $inBox.data("columnizing", true);
 145
 146                         $inBox.empty();
 147                         $inBox.append($("<div style='width:" + (Math.round(100 / numCols) - 2)+ "%; padding: 3px; float: left;'></div>")); //"
 148                         $col = $inBox.children(":last");
 149                         $col.append($cache.clone());
 150                         maxHeight = $col.height();
 151                         $inBox.empty();
 152
 153                         var targetHeight = maxHeight / numCols;
 154                         var firstTime = true;
 155                         var maxLoops = 3;
 156                         for(var loopCount=0;loopCount<maxLoops;loopCount++){
 157                                 $inBox.empty();
 158                                 var $destroyable = $cache.clone();
 159                                 $destroyable.css("visibility", "hidden");
 160                                 // create the columns
 161                                 for (var i = 0; i < numCols; i++) {
 162                                         /* create column */
 163                                         var className = (i == 0) ? "first column" : "column";
 164                                         var className = (i == numCols - 1) ? ("last " + className) : className;
 165                                         $inBox.append($("<div class='" + className + "' style='width:" + (Math.round(100 / numCols) - 2)+ "%; float: left;'></div>")); //"
 166                                 }
 167
 168                                 // fill all but the last column
 169                                 for (var i = 0; i < numCols-1; i++) {
 170                                         var $col = $inBox.children().eq(i);
 171                                         columnize($col, $destroyable, $col, targetHeight);
 172                                         split($col, $destroyable, $col, targetHeight);
 173                                 }
 174                                 // the last column in the series
 175                                 $col = $inBox.children().eq($inBox.children().length-1);
 176                                 while($destroyable.children().length) $col.append($destroyable.children(":first"));
 177                                 var afterH = $col.height();
 178                                 var diff = afterH - targetHeight;
 179                                 var totalH = 0;
 180                                 var min = 10000000;
 181                                 var max = 0;
 182                                 $inBox.children().each(function($inBox){ return function($item){
 183                                         var h = $inBox.children().eq($item).height();
 184                                         totalH += h;
 185                                         if(h > max) max = h;
 186                                         if(h < min) min = h;
 187                                 }}($inBox));
 188                                 var avgH = totalH / numCols;
 189                                 if(max - min > 30){
 190                                         targetHeight = avgH + 30;
 191                                 }else if(Math.abs(avgH-targetHeight) > 20){
 192                                         targetHeight = avgH;
 193                                 }else{
 194                                         loopCount = maxLoops;
 195                                 }
 196                                 $inBox.append($("<br style='clear:both;'>"));
 197                         }
 198                         $inBox.data("columnizing", false);
 199                 }
 200     });
 201  };
 202 })(jQuery);