ncbo/bioportal_web_ui

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app/assets/javascripts/bp_crossdomain_autocomplete.js

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1 mo
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// Generally we use jQuery as the keyword but some people
// will use another framework which takes control of the $.
// To avoid re-writing this script we'll use a wrapper.
(function($) {
  $(function() {
    jQuery.bp_autocomplete = function(input, options) {
      // Create a link to self
      var me = this;

      // Create jQuery object for input element
      var $input = $(input).attr("autocomplete", "off");

      // Apply inputClass if necessary
      if (options.inputClass) $input.addClass(options.inputClass);

      // Create results
      if (document.getElementById(options.resultsClass) == null) {
        var results = document.createElement("div");
        // Create jQuery object for results
        var $results = $(results);
        $results.hide().addClass(options.resultsClass).css("position", "absolute").attr("id", options.resultsClass);
        if( options.width > 0 ) $results.css("width", options.width);

        // Add to body element
        $("body").append(results);
      } else {
        var results = document.getElementById(options.resultsClass);
        var $results = $(results);
      }

      input.autocompleter = me;

      var timeout = null;
      var prev = "";
      var active = -1;
      var cache = {};
      var keyb = false;
      var hasFocus = false;
      var lastKeyPressCode = null;

      // flush cache
      function flushCache(){
        cache = {};
        cache.data = {};
        cache.length = 0;
      };

      // flush cache
      flushCache();

      // if there is a data array supplied
      if( options.data != null ){
        var sFirstChar = "", stMatchSets = {}, row = [];

        // no url was specified, we need to adjust the cache length to make sure it fits the local data store
        if( typeof options.url != "string" ) options.cacheLength = 1;

        // loop through the array and create a lookup structure
        for( var i=0; i < options.data.length; i++ ){
          // if row is a string, make an array otherwise just reference the array

          row = ((typeof options.data[i] == "string") ? [options.data[i]] : options.data[i]);

          // if the length is zero, don't add to list
          if( row[0].length > 0 ){
            // get the first character
            sFirstChar = row[0].substring(0, 1).toLowerCase();
            // if no lookup array for this character exists, look it up now
            if( !stMatchSets[sFirstChar] ) stMatchSets[sFirstChar] = [];
            // if the match is a string
            stMatchSets[sFirstChar].push(row);
          }
        }

        // add the data items to the cache
        for( var k in stMatchSets ){
          // increase the cache size
          options.cacheLength++;
          // add to the cache

          addToCache(k, stMatchSets[k]);
        }
      }

      $input
      .keydown(function(e) {
        // track last key pressed
        lastKeyPressCode = e.keyCode;
        switch(e.keyCode) {
          case 38: // up
            e.preventDefault();
            moveSelect(-1);
            break;
          case 40: // down
            e.preventDefault();
            moveSelect(1);
            break;
          case 9:  // tab
          case 13: // return
            if( selectCurrent() ){
              // make sure to blur off the current field
              $input.get(0).blur();
              e.preventDefault();
            }
            break;
          default:
            active = -1;
            if (timeout) clearTimeout(timeout);
            timeout = setTimeout(function(){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 = true;
      })
      .blur(function() {
        // track whether the field has focus
        hasFocus = false;
        hideResults();
      });

      // hideResultsNow();

      function onChange() {
        // ignore if the following keys are pressed: [del] [shift] [capslock]
        if( lastKeyPressCode == 46 || (lastKeyPressCode > 8 && lastKeyPressCode < 32) ) return $results.hide();
        var v = $input.val();
        if (v == prev) return;
        prev = v;
        if (v.length >= options.minChars) {
          $input.addClass(options.loadingClass);
          requestData(v);
        } else {
          $input.removeClass(options.loadingClass);
          $results.hide();
        }
      };

      function moveSelect(step) {

        var lis = $("li", results);
        if (!lis) return;

        active += step;

        if (active < 0) {
          active = 0;
        } else if (active >= lis.size()) {
          active = lis.size() - 1;
        }

        lis.removeClass("ac_over");

        $(lis[active]).addClass("ac_over");

        // Weird behaviour in IE
        // if (lis[active] && lis[active].scrollIntoView) {
        //  lis[active].scrollIntoView(false);
        // }

      };

      function selectCurrent() {
        var li = $("li.ac_over", results)[0];
        if (!li) {
          var $li = $("li", results);
          if (options.selectOnly) {
            if ($li.length == 1) li = $li[0];
          } else if (options.selectFirst) {
            li = $li[0];
          }
        }
        if (li) {
          selectItem(li);
          return true;
        } else {
          return false;
        }
      };

      function selectItem(li) {
        if (!li) {
          li = document.createElement("li");
          li.extra = [];
          li.selectValue = "";
        }
        var v = $.trim(li.selectValue ? li.selectValue : li.innerHTML);
        input.lastSelected = v;
        prev = v;
        $results.html("");
        $input.val(v);
        hideResultsNow();
        if (options.onItemSelect) setTimeout(function() { options.onItemSelect(li) }, 1);
        setTimeout(function() { $input.trigger("autocomplete_selected"); }, 2);
      };

      // selects a portion of the input string
      function createSelection(start, end){
        // get a reference to the input element
        var field = $input.get(0);
        if( field.createTextRange ){
          var selRange = field.createTextRange();
          selRange.collapse(true);
          selRange.moveStart("character", start);
          selRange.moveEnd("character", end);
          selRange.select();
        } else if( field.setSelectionRange ){
          field.setSelectionRange(start, end);
        } else {
          if( field.selectionStart ){
            field.selectionStart = start;
            field.selectionEnd = end;
          }
        }
        field.focus();
      };

      // fills in the input box w/the first match (assumed to be the best match)
      function autoFill(sValue){
        // if the last user key pressed was backspace, don't autofill
        if( lastKeyPressCode != 8 ){
          // fill in the value (keep the case the user has typed)
          $input.val($input.val() + sValue.substring(prev.length));
          // select the portion of the value not typed by the user (so the next character will erase)
          createSelection(prev.length, sValue.length);
        }
      };

      function showResults() {
        // get the position of the input field right now (in case the DOM is shifted)
        var pos = findPos(input);
        // either use the specified width, or autocalculate based on form element
        var iWidth = (options.width > 0) ? options.width : $input.width();
        // add any footer information
        if (typeof options.header !== 'undefined') $results.prepend(options.header);
        // add any footer information
        if (typeof options.footer !== 'undefined') $results.append(options.footer);
        // reposition
        $results.css({
          width: parseInt(iWidth) + "px",
          top: (pos.y + input.offsetHeight) + "px",
          left: pos.x + "px"
        }).show();
      };

      function hideResults() {
        if (timeout) clearTimeout(timeout);
        timeout = setTimeout(hideResultsNow, 200);
      };

      function hideResultsNow() {
        if (timeout) clearTimeout(timeout);
        $input.removeClass(options.loadingClass);
        if ($results.is(":visible")) {
          $results.hide();
        }
        if (options.mustMatch) {
          var v = $input.val();
          if (v != input.lastSelected) {
            $input.addClass("help_text_font").val($input.attr("title"));
          }
        }
      };

      function receiveData(q, data) {
        if (data) {
          $input.removeClass(options.loadingClass);
          results.innerHTML = "";

          // if the field no longer has focus or if there are no matches, do not display the drop down
          if( !hasFocus ) return hideResultsNow();

          if( data.length == 0 )
            results.appendChild("<div style='padding: 5px; font-size: normal; font-style: oblique;'>No results found</div>")

          if ($.browser.msie && $.browser.version < 9) {
            // we put a styled iframe behind the calendar so HTML SELECT elements don't show through
            $results.append(document.createElement('iframe'));
          }
          results.appendChild(dataToDom(data));
          // autofill in the complete box w/the first match as long as the user hasn't entered in more data
          if( options.autoFill && ($input.val().toLowerCase() == q.toLowerCase()) ) autoFill(data[0][0]);
          showResults();
        } else {
          $input.removeClass(options.loadingClass);
          results.innerHTML = "<div style='padding: 5px; font-size: normal; font-style: oblique;'>No results found</div>";
          showResults();
        }
      };

      function parseData(data) {
        if (!data) return null;
        var parsed = [];
        var rows = data.split(options.lineSeparator);
        for (var i=0; i < rows.length; i++) {
          var row = $.trim(rows[i]);
          if (row) {
            parsed[parsed.length] = row.split(options.cellSeparator);
          }
        }
        return parsed;
      };

      function dataToDom(data) {
        var ul = document.createElement("ul");
        var num = data.length;

        // limited results to a max number
        if( (options.maxItemsToShow > 0) && (options.maxItemsToShow < num) ) num = options.maxItemsToShow;

        for (var i=0; i < num; i++) {
          var row = data[i];
          if (!row) continue;
          var li = document.createElement("li");
          if (options.formatItem) {
            li.innerHTML = options.formatItem(row, i, num);
            li.selectValue = row[0];
          } else {
            li.innerHTML = row[0];
            li.selectValue = row[0];
          }
          var extra = null;
          if (row.length > 1) {
            extra = [];
            for (var j=1; j < row.length; j++) {
              extra[extra.length] = row[j];
            }
          }
          li.extra = extra;
          ul.appendChild(li);
          $(li).hover(
            function() { $("li", ul).removeClass("ac_over"); $(this).addClass("ac_over"); active = $("li", ul).indexOf($(this).get(0)); },
            function() { $(this).removeClass("ac_over"); }
          ).click(function(e) { e.preventDefault(); e.stopPropagation(); selectItem(this) });
        }
        return ul;
      };

      function requestData(q) {
        if (!options.matchCase) q = q.toLowerCase();
        var data = options.cacheLength ? loadFromCache(q) : null;
        // recieve the cached data
        if (data) {
          receiveData(q, data);
        // if an AJAX url has been supplied, try loading the data now
        } else if( (typeof options.url == "string") && (options.url.length > 0) ){
          $.getJSON(makeUrl(q)+"&response=json&callback=?", function(data) {
    //                alert(data.data)
            data = parseData(data.data);
            addToCache(q, data);
            receiveData(q, data);
          });
        // if there's been no data found, remove the loading class
        } else {
          $input.removeClass(options.loadingClass);
        }
      };

      function makeUrl(q) {
        var url = options.url + "?q=" + encodeURI(q);
        for (var i in options.extraParams) {
          url += "&" + i + "=" + encodeURI(options.extraParams[i]);
        }
        return url;
      };

      function loadFromCache(q) {
        if (!q) return null;
        if (cache.data[q]) return cache.data[q];
        if (options.matchSubset) {
          for (var i = q.length - 1; i >= options.minChars; i--) {
            var qs = q.substr(0, i);
            var c = cache.data[qs];
            if (c) {
              var csub = [];
              for (var j = 0; j < c.length; j++) {
                var x = c[j];
                var x0 = x[0];
                if (matchSubset(x0, q)) {
                  csub[csub.length] = x;
                }
              }
              return csub;
            }
          }
        }
        return null;
      };

      function matchSubset(s, sub) {
        if (!options.matchCase) s = s.toLowerCase();
        var i = s.indexOf(sub);
        if (i == -1) return false;
        return i == 0 || options.matchContains;
      };

      this.flushCache = function() {
        flushCache();
      };

      this.setExtraParams = function(p) {
        options.extraParams = p;
      };

      this.getExtraParams = function() {
        return options.extraParams;
      };

      this.getOptions = function() {
        return options;
      };

      this.findValue = function(){
        var q = $input.val();

        if (!options.matchCase) q = q.toLowerCase();
        var data = options.cacheLength ? loadFromCache(q) : null;
        if (data) {
          findValueCallback(q, data);
        } else if( (typeof options.url == "string") && (options.url.length > 0) ){
          $.get(makeUrl(q), function(data) {
            data = parseData(data)
            addToCache(q, data);
            findValueCallback(q, data);
          });
        } else {
          // no matches
          findValueCallback(q, null);
        }
      }

      function findValueCallback(q, data){
        if (data) $input.removeClass(options.loadingClass);

        var num = (data) ? data.length : 0;
        var li = null;

        for (var i=0; i < num; i++) {
          var row = data[i];

          if( row[0].toLowerCase() == q.toLowerCase() ){
            li = document.createElement("li");
            if (options.formatItem) {
              li.innerHTML = options.formatItem(row, i, num);
              li.selectValue = row[0];
            } else {
              li.innerHTML = row[0];
              li.selectValue = row[0];
            }
            var extra = null;
            if( row.length > 1 ){
              extra = [];
              for (var j=1; j < row.length; j++) {
                extra[extra.length] = row[j];
              }
            }
            li.extra = extra;
          }
        }
        if( options.onFindValue ) setTimeout(function() { options.onFindValue(li) }, 1);
      }

      function addToCache(q, data) {
        if (!data || !q || !options.cacheLength) return;
        if (!cache.length || cache.length > options.cacheLength) {
          flushCache();
          cache.length++;
        } else if (!cache[q]) {
          cache.length++;
        }
        cache.data[q] = data;
      };

      function findPos(obj) {
        var curleft = obj.offsetLeft || 0;
        var curtop = obj.offsetTop || 0;
        while (obj = obj.offsetParent) {
          curleft += obj.offsetLeft
          curtop += obj.offsetTop
        }
        return {x:curleft,y:curtop};
      }
    }

    jQuery.fn.bp_autocomplete = function(url, options, data) {
      // Make sure options exists
      options = options || {};
      // Set url as option
      options.url = url;
      // set some bulk local data
      options.data = ((typeof data == "object") && (data.constructor == Array)) ? data : null;

      // Set default values for required options
      options.inputClass = options.inputClass || "ac_input";
      options.resultsClass = options.resultsClass || "ac_results";
      options.lineSeparator = options.lineSeparator || "\n";
      options.cellSeparator = options.cellSeparator || "|";
      options.minChars = options.minChars || 1;
      options.delay = options.delay || 400;
      options.matchCase = options.matchCase || 0;
      options.matchSubset = options.matchSubset || 0;
      options.matchContains = options.matchContains || 0;
      options.cacheLength = options.cacheLength || 1;
      options.mustMatch = options.mustMatch || 0;
      options.extraParams = options.extraParams || {};
      options.loadingClass = options.loadingClass || "ac_loading";
      options.selectFirst = options.selectFirst || false;
      options.selectOnly = options.selectOnly || false;
      options.maxItemsToShow = options.maxItemsToShow || -1;
      options.autoFill = options.autoFill || false;
      options.width = parseInt(options.width, 10) || 0;
      this.each(function() {
        var input = this;
        new jQuery.bp_autocomplete(input, options);
      });

      // Don't break the chain
      return this;
    }

    jQuery.fn.bp_autocompleteArray = function(data, options) {
      return this.bp_autocomplete(null, options, data);
    }

    jQuery.fn.indexOf = function(e){
      for( var i=0; i<this.length; i++ ){
        if( this[i] == e ) return i;
      }
      return -1;
    };
  });
})(jQuery);