jquery实现联想词搜索框和搜索结果分页的示例(4)

 
$().ready(function() {
 if($("input[type=text]").hasClass('isearchSug')){ 
  $( ".isearchSug" ).iautocomplete("http://10.18.224.45:8080/lenovo/lenovo", {
    selectFirst: false,
    matchSubset:false,
    scroll:false
  });
 }
});
 
 
;(function($) {
 
$.fn.extend({
 iautocomplete: function(urlOrData, options) {
  var isUrl = typeof urlOrData == "string";
  options = $.extend({}, $.iAutocompleter.defaults, {
   url: isUrl ? urlOrData : null,
   data: isUrl ? null : urlOrData,
   delay: isUrl ? $.iAutocompleter.defaults.delay : 10,
   max: options && !options.scroll ? 10 : 150
  }, options);
  
  // if highlight is set to false, replace it with a do-nothing function
  options.highlight = options.highlight || function(value) { return value; };
  
  // if the formatMatch option is not specified, then use formatItem for backwards compatibility
  options.formatMatch = options.formatMatch || options.formatItem;
  
  return this.each(function() {
   new $.iAutocompleter(this, options);
  });
 },
 result: function(handler) {
  return this.bind("result", handler);
 },
 search: function(handler) {
  return this.trigger("search", [handler]);
 },
 flushCache: function() {
  return this.trigger("flushCache");
 },
 setOptions: function(options){
  return this.trigger("setOptions", [options]);
 },
 unautocomplete: function() {
  return this.trigger("unautocomplete");
 }
});
 
$.iAutocompleter = function(input, options) {
 
 var KEY = {
  UP: 38,
  DOWN: 40,
  DEL: 46,
  TAB: 9,
  RETURN: 13,
  ESC: 27,
  COMMA: 188,
  PAGEUP: 33,
  PAGEDOWN: 34,
  BACKSPACE: 8
 };
 
 // Create $ object for input element
 var $input = $(input).attr("autocomplete", "off").addClass(options.inputClass);
 
 var timeout;
 var previousValue = "";
 var cache = $.iAutocompleter.Cache(options);
 var hasFocus = 0;
 var lastKeyPressCode;
 var config = {
  mouseDownOnSelect: false
 };
 var select = $.iAutocompleter.Select(options, input, selectCurrent, config);
 
 var blockSubmit;
 
 // prevent form submit in opera when selecting with return key
 $.browser.opera && $(input.form).bind("submit.iautocomplete", function() {
  if (blockSubmit) {
   blockSubmit = false;
   return false;
  }
 });
 
 // only opera doesn't trigger keydown multiple times while pressed, others don't work with keypress at all
 $input.bind(($.browser.opera ? "keypress" : "keydown") + ".iautocomplete", function(event) {
  // a keypress means the input has focus
  // avoids issue where input had focus before the autocomplete was applied
  hasFocus = 1;
  // track last key pressed
  lastKeyPressCode = event.keyCode;
  switch(event.keyCode) {
  
   case KEY.UP:
    event.preventDefault();
    if ( select.visible() ) {
     select.prev();
    } else {
     onChange(0, true);
    }
    break;
    
   case KEY.DOWN:
    event.preventDefault();
    if ( select.visible() ) {
     select.next();
    } else {
     onChange(0, true);
    }
    break;
    
   case KEY.PAGEUP:
    event.preventDefault();
    if ( select.visible() ) {
     select.pageUp();
    } else {
     onChange(0, true);
    }
    break;
    
   case KEY.PAGEDOWN:
    event.preventDefault();
    if ( select.visible() ) {
     select.pageDown();
    } else {
     onChange(0, true);
    }
    break;
   
   // matches also semicolon
   case options.multiple && $.trim(options.multipleSeparator) == "," && KEY.COMMA:
   case KEY.TAB:
   case KEY.RETURN:
    if( selectCurrent() ) {
     // stop default to prevent a form submit, Opera needs special handling
     event.preventDefault();
     blockSubmit = true;
     return false;
    }
    break;
    
   case KEY.ESC:
    select.hide();
    break;
    
   default:
    clearTimeout(timeout);
    timeout = setTimeout(onChange, options.delay);
    break;
  }
 }).focus(function(){
  // track whether the field has focus, we shouldn't process any
  // results if the field no longer has focus
  hasFocus++;
 }).blur(function() {
  hasFocus = 0;
  if (!config.mouseDownOnSelect) {
   hideResults();
  }
 }).click(function() {
  // show select when clicking in a focused field
  if ( hasFocus++ > 1 && !select.visible() ) {
   onChange(0, true);
  }
 }).bind("search", function() {
  // TODO why not just specifying both arguments?
  var fn = (arguments.length > 1) ? arguments[1] : null;
  function findValueCallback(q, data) {
   var result;
   if( data && data.length ) {
    for (var i=0; i < data.length; i++) {
     if( data[i].result.toLowerCase() == q.toLowerCase() ) {
      result = data[i];
      break;
     }
    }
   }
   if( typeof fn == "function" ) fn(result);
   else $input.trigger("result", result && [result.data, result.value]);
  }
  $.each(trimWords($input.val()), function(i, value) {
   request(value, findValueCallback, findValueCallback);
  });
 }).bind("flushCache", function() {
  cache.flush();
 }).bind("setOptions", function() {
  $.extend(options, arguments[1]);
  // if we've updated the data, repopulate
  if ( "data" in arguments[1] )
   cache.populate();
 }).bind("input", function() { 
  onChange(0,true);
 }).bind("unautocomplete", function() {
  select.unbind();
  $input.unbind();
  $(input.form).unbind(".iautocomplete");
 }).bind("change", function() {
  $input.search(
   function (result){
    $input.trigger("result", result && [result.data, result.value]);
   }
  );
 });
 
 
 function selectCurrent() {
  var selected = select.selected();
  if( !selected )
   return false;
  
  var v = selected.result;
  previousValue = v;
  
  if ( options.multiple ) {
   var words = trimWords($input.val());
   if ( words.length > 1 ) {
    var seperator = options.multipleSeparator.length;
    var cursorAt = $(input).selection().start;
    var wordAt, progress = 0;
    $.each(words, function(i, word) {
     progress += word.length;
     if (cursorAt <= progress) {
      wordAt = i;
      return false;
     }
     progress += seperator;
    });
    words[wordAt] = v;
    // TODO this should set the cursor to the right position, but it gets overriden somewhere
    //$.Autocompleter.Selection(input, progress + seperator, progress + seperator);
    v = words.join( options.multipleSeparator );
   }
   v += options.multipleSeparator;
  }
  
  $input.val(v);
  hideResultsNow();
  $input.trigger("result", [selected.data, selected.value]);
  return true;
 }
 
 function onChange(crap, skipPrevCheck) {
  if( lastKeyPressCode == KEY.DEL ) {
   select.hide();
   return;
  }
  
  var currentValue = $input.val();
  
  if ( !skipPrevCheck && currentValue == previousValue )
   return;
  
  previousValue = currentValue;
  
  currentValue = lastWord(currentValue);
  if ( currentValue.length >= options.minChars) {
   $input.addClass(options.loadingClass);
   if (!options.matchCase)
    currentValue = currentValue.toLowerCase();
   request(currentValue, receiveData, hideResultsNow);
  } else {
   stopLoading();
   select.hide();
  }
 };
 
 function trimWords(value) {
  if (!value)
   return [""];
  if (!options.multiple)
   return [$.trim(value)];
  return $.map(value.split(options.multipleSeparator), function(word) {
   return $.trim(value).length ? $.trim(word) : null;
  });
 }
 
 function lastWord(value) {
  if ( !options.multiple )
   return value;
  var words = trimWords(value);
  if (words.length == 1) 
   return words[0];
  var cursorAt = $(input).selection().start;
  if (cursorAt == value.length) {
   words = trimWords(value)
  } else {
   words = trimWords(value.replace(value.substring(cursorAt), ""));
  }
  return words[words.length - 1];
 }
 
 // fills in the input box w/the first match (assumed to be the best match)
 // q: the term entered
 // sValue: the first matching result
 function autoFill(q, sValue){
  // autofill in the complete box w/the first match as long as the user hasn't entered in more data
  // if the last user key pressed was backspace, don't autofill
  if( options.autoFill && (lastWord($input.val()).toLowerCase() == q.toLowerCase()) && lastKeyPressCode != KEY.BACKSPACE ) {
   // fill in the value (keep the case the user has typed)
   $input.val($input.val() + sValue.substring(lastWord(previousValue).length));
   // select the portion of the value not typed by the user (so the next character will erase)
   $(input).selection(previousValue.length, previousValue.length + sValue.length);
  }
 };
 
 function hideResults() {
  clearTimeout(timeout);
  timeout = setTimeout(hideResultsNow, 200);
 };
 
 function hideResultsNow() {
  var wasVisible = select.visible();
  select.hide();
  clearTimeout(timeout);
  stopLoading();
  if (options.mustMatch) {
   // call search and run callback
   $input.search(
    function (result){
     // if no value found, clear the input box
     if( !result ) {
      if (options.multiple) {
       var words = trimWords($input.val()).slice(0, -1);
       $input.val( words.join(options.multipleSeparator) + (words.length ? options.multipleSeparator : "") );
      }
      else {
       $input.val( "" );
       $input.trigger("result", null);
      }
     }
    }
   );
  }
 };
 
 function receiveData(q, data) {
  if ( data && data.length && hasFocus ) {
   stopLoading();
   select.display(data, q);
   autoFill(q, data[0].value);
   select.show();
  } else {
   hideResultsNow();
  }
 };
 
 function request(term, success, failure) {
  if (!options.matchCase)
   term = term.toLowerCase();
  var data = cache.load(term);
  // recieve the cached data
  if (data && data.length) {
   success(term, data);
  // if an AJAX url has been supplied, try loading the data now
  } else if( (typeof options.url == "string") && (options.url.length > 0) ){
   var extraParams = {
    timestamp: +new Date()
   };
   $.each(options.extraParams, function(key, param) {
    extraParams[key] = typeof param == "function" ? param() : param;
   });
   $.ajax({
    // try to leverage ajaxQueue plugin to abort previous requests
    mode: "abort",
    // limit abortion to this input
    port: "iautocomplete" + input.name,
    dataType: options.dataType,
    url: options.url,
    data: $.extend({
     q: lastWord(term),
     limit: options.max
    }, extraParams),
    success: function(data) {
     var parsed = options.parse && options.parse(data) || parse(data);
     cache.add(term, parsed);
     success(term, parsed);
    }
   });
  } else {
   // if we have a failure, we need to empty the list -- this prevents the the [TAB] key from selecting the last successful match
   select.emptyList();
   failure(term);
  }
 };
 
 function parse(data) {
  var parsed = [];
 // var rows = data.split("\n");
  
  if(data==null||data==""){
   return parsed;
  }
  var obj = eval(data);
  var arr = obj.lenovoWords;
  var rows = arr;
  
  for (var i=0; i < rows.length; i++) {
   var row = $.trim(rows[i]);
   if (row) {
    row = row.split("|");
    parsed[parsed.length] = {
     data: row,
     value: row[0],
     result: options.formatResult && options.formatResult(row, row[0]) || row[0]
    };
   }
  }
  return parsed;
 };
 function stopLoading() {
  $input.removeClass(options.loadingClass);
 };
};
$.iAutocompleter.defaults = {
 inputClass: "ac_input",
 resultsClass: "ac_results",
 loadingClass: "ac_loading",
 minChars: 1,
 delay: 400,
 matchCase: false,
 matchSubset: true,
 matchContains: false,
 cacheLength: 10,
 max: 100,
 mustMatch: false,
 extraParams: {},
 selectFirst: true,
 formatItem: function(row) { return row[0]; },
 formatMatch: null,
 autoFill: false,
 width: 0,
 multiple: false,
 multipleSeparator: ", ",
 highlight: function(value, term) {
  return value.replace(new RegExp("(?![^&;]+;)(?!<[^<>]*)(" + term.replace(/([\^\$\(\)\[\]\{\}\*\.\+\?\|\\])/gi, "\\$1") + ")(?![^<>]*>)(?![^&;]+;)", "gi"), "<strong>$1</strong>");
 },
 scroll: true,
 scrollHeight: 180
};
 
$.iAutocompleter.Cache = function(options) {
 
 var data = {};
 var length = 0;
 
 function matchSubset(s, sub) {
  if (!options.matchCase) 
   s = s.toLowerCase();
  var i = s.indexOf(sub);
  if (options.matchContains == "word"){
   i = s.toLowerCase().search("\\b" + sub.toLowerCase());
  }
  if (i == -1) return false;
  return i == 0 || options.matchContains;
 };
 
 function add(q, value) {
  if (length > options.cacheLength){
   flush();
  }
  if (!data[q]){ 
   length++;
  }
  data[q] = value;
 }
 
 function populate(){
  if( !options.data ) return false;
  // track the matches
  var stMatchSets = {},
   nullData = 0;
 
  // no url was specified, we need to adjust the cache length to make sure it fits the local data store
  if( !options.url ) options.cacheLength = 1;
  
  // track all options for minChars = 0
  stMatchSets[""] = [];
  
  // loop through the array and create a lookup structure
  for ( var i = 0, ol = options.data.length; i < ol; i++ ) {
   var rawValue = options.data[i];
   // if rawValue is a string, make an array otherwise just reference the array
   rawValue = (typeof rawValue == "string") ? [rawValue] : rawValue;
   
   var value = options.formatMatch(rawValue, i+1, options.data.length);
   if ( value === false )
    continue;
    
   var firstChar = value.charAt(0).toLowerCase();
   // if no lookup array for this character exists, look it up now
   if( !stMatchSets[firstChar] ) 
    stMatchSets[firstChar] = [];
   // if the match is a string
   var row = {
    value: value,
    data: rawValue,
    result: options.formatResult && options.formatResult(rawValue) || value
   };
   
   // push the current match into the set list
   stMatchSets[firstChar].push(row);
   // keep track of minChars zero items
   if ( nullData++ < options.max ) {
    stMatchSets[""].push(row);
   }
  };
  // add the data items to the cache
  $.each(stMatchSets, function(i, value) {
   // increase the cache size
   options.cacheLength++;
   // add to the cache
   add(i, value);
  });
 }
 
 // populate any existing data
 setTimeout(populate, 25);
 
 function flush(){
  data = {};
  length = 0;
 }
 
 return {
  flush: flush,
  add: add,
  populate: populate,
  load: function(q) {
   if (!options.cacheLength || !length)
    return null;
   /* 
    * if dealing w/local data and matchContains than we must make sure
    * to loop through all the data collections looking for matches
    */
   if( !options.url && options.matchContains ){
    // track all matches
    var csub = [];
    // loop through all the data grids for matches
    for( var k in data ){
     // don't search through the stMatchSets[""] (minChars: 0) cache
     // this prevents duplicates
     if( k.length > 0 ){
      var c = data[k];
      $.each(c, function(i, x) {
       // if we've got a match, add it to the array
       if (matchSubset(x.value, q)) {
        csub.push(x);
       }
      });
     }
    }    
    return csub;
   } else 
   // if the exact item exists, use it
   if (data[q]){
    return data[q];
   } else
   if (options.matchSubset) {
    for (var i = q.length - 1; i >= options.minChars; i--) {
     var c = data[q.substr(0, i)];
     if (c) {
      var csub = [];
      $.each(c, function(i, x) {
       if (matchSubset(x.value, q)) {
        csub[csub.length] = x;
       }
      });
      return csub;
     }
    }
   }
   return null;
  }
 };
};
 
$.iAutocompleter.Select = function (options, input, select, config) {
 var CLASSES = {
  ACTIVE: "ac_over"
 };
 
 var listItems,
  active = -1,
  data,
  term = "",
  needsInit = true,
  element,
  list;
 
 // Create results
 function init() {
  if (!needsInit)
   return;
  element = $("<div/>")
  .hide()
  .addClass(options.resultsClass)
  .css("position", "absolute")
  .appendTo(document.body);
 
  list = $("<ul/>").appendTo(element).mouseover( function(event) {
   if(target(event).nodeName && target(event).nodeName.toUpperCase() == 'LI') {
    active = $("li", list).removeClass(CLASSES.ACTIVE).index(target(event));
    $(target(event)).addClass(CLASSES.ACTIVE);   
   }
  }).click(function(event) {
   $(target(event)).addClass(CLASSES.ACTIVE);
   select();
   // TODO provide option to avoid setting focus again after selection? useful for cleanup-on-focus
   input.focus();
   return false;
  }).mousedown(function() {
   config.mouseDownOnSelect = true;
  }).mouseup(function() {
   config.mouseDownOnSelect = false;
  });
  
  if( options.width > 0 )
   element.css("width", options.width);
   
  needsInit = false;
 } 
 
 function target(event) {
  var element = event.target;
  while(element && element.tagName != "LI")
   element = element.parentNode;
  // more fun with IE, sometimes event.target is empty, just ignore it then
  if(!element)
   return [];
  return element;
 }
 
 function moveSelect(step) {
  listItems.slice(active, active + 1).removeClass(CLASSES.ACTIVE);
  movePosition(step);
  var activeItem = listItems.slice(active, active + 1).addClass(CLASSES.ACTIVE);
  if(options.scroll) {
   var offset = 0;
   listItems.slice(0, active).each(function() {
    offset += this.offsetHeight;
   });
   if((offset + activeItem[0].offsetHeight - list.scrollTop()) > list[0].clientHeight) {
    list.scrollTop(offset + activeItem[0].offsetHeight - list.innerHeight());
   } else if(offset < list.scrollTop()) {
    list.scrollTop(offset);
   }
  }
 };
 
 function movePosition(step) {
  active += step;
  if (active < 0) {
   active = listItems.size() - 1;
  } else if (active >= listItems.size()) {
   active = 0;
  }
 }
 
 function limitNumberOfItems(available) {
  return options.max && options.max < available
   ? options.max
   : available;
 }
 
 function fillList() {
  list.empty();
  var max = limitNumberOfItems(data.length);
  for (var i=0; i < max; i++) {
   if (!data[i])
    continue;
   var formatted = options.formatItem(data[i].data, i+1, max, data[i].value, term);
   if ( formatted === false )
    continue;
   var li = $("<li/>").html( options.highlight(formatted, term) ).addClass(i%2 == 0 ? "ac_even" : "ac_odd").appendTo(list)[0];
   $.data(li, "ac_data", data[i]);
  }
  listItems = list.find("li");
  if ( options.selectFirst ) {
   listItems.slice(0, 1).addClass(CLASSES.ACTIVE);
   active = 0;
  }
  // apply bgiframe if available
  if ( $.fn.bgiframe )
   list.bgiframe();
 }
 
 return {
  display: function(d, q) {
   init();
   data = d;
   term = q;
   fillList();
  },
  next: function() {
   moveSelect(1);
  },
  prev: function() {
   moveSelect(-1);
  },
  pageUp: function() {
   if (active != 0 && active - 8 < 0) {
    moveSelect( -active );
   } else {
    moveSelect(-8);
   }
  },
  pageDown: function() {
   if (active != listItems.size() - 1 && active + 8 > listItems.size()) {
    moveSelect( listItems.size() - 1 - active );
   } else {
    moveSelect(8);
   }
  },
  hide: function() {
   element && element.hide();
   listItems && listItems.removeClass(CLASSES.ACTIVE);
   active = -1;
  },
  visible : function() {
   return element && element.is(":visible");
  },
  current: function() {
   return this.visible() && (listItems.filter("." + CLASSES.ACTIVE)[0] || options.selectFirst && listItems[0]);
  },
  show: function() {
   var offset = $(input).offset();
   element.css({
    width: typeof options.width == "string" || options.width > 0 ? options.width : $(input).width(),
    top: offset.top + input.offsetHeight,
    left: offset.left
   }).show();
   if(options.scroll) {
    list.scrollTop(0);
    list.css({
     maxHeight: options.scrollHeight,
     overflow: 'auto'
    });
    
    if($.browser.msie && typeof document.body.style.maxHeight === "undefined") {
     var listHeight = 0;
     listItems.each(function() {
      listHeight += this.offsetHeight;
     });
     var scrollbarsVisible = listHeight > options.scrollHeight;
     list.css('height', scrollbarsVisible ? options.scrollHeight : listHeight );
     if (!scrollbarsVisible) {
      // IE doesn't recalculate width when scrollbar disappears
      listItems.width( list.width() - parseInt(listItems.css("padding-left")) - parseInt(listItems.css("padding-right")) );
     }
    }
    
   }
  },
  selected: function() {
   var selected = listItems && listItems.filter("." + CLASSES.ACTIVE).removeClass(CLASSES.ACTIVE);
   return selected && selected.length && $.data(selected[0], "ac_data");
  },
  emptyList: function (){
   list && list.empty();
  },
  unbind: function() {
   element && element.remove();
  }
 };
};
 
$.fn.selection = function(start, end) {
 if (start !== undefined) {
  return this.each(function() {
   if( this.createTextRange ){
    var selRange = this.createTextRange();
    if (end === undefined || start == end) {
     selRange.move("character", start);
     selRange.select();
    } else {
     selRange.collapse(true);
     selRange.moveStart("character", start);
     selRange.moveEnd("character", end);
     selRange.select();
    }
   } else if( this.setSelectionRange ){
    this.setSelectionRange(start, end);
   } else if( this.selectionStart ){
    this.selectionStart = start;
    this.selectionEnd = end;
   }
  });
 }
 var field = this[0];
 if ( field.createTextRange ) {
  var range = document.selection.createRange(),
   orig = field.value,
   teststring = "<->",
   textLength = range.text.length;
  range.text = teststring;
  var caretAt = field.value.indexOf(teststring);
  field.value = orig;
  this.selection(caretAt, caretAt + textLength);
  return {
   start: caretAt,
   end: caretAt + textLength
  }
 } else if( field.selectionStart !== undefined ){
  return {
   start: field.selectionStart,
   end: field.selectionEnd
  }
 }
};
 
})(jQuery);