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/* |
/* |
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Fast filtering function using pre-sorted list elements |
Fast filtering function using pre-sorted list elements |
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Dobrica Pavlinusic, dpavlin@rot13.org 2004-09-06 |
Dobrica Pavlinusic, dpavlin@rot13.org 2004-09-06 |
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Matko Andjelinic, matko.andjelinic@gmail.com 2004-09-09 (contributed OO implementation) |
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*/ |
*/ |
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var debug = 0; |
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function bfilter_init() { |
function BFilter(arr) { |
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show_status(); |
this.id_cache = Array(); |
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} |
// total number of hits |
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this.hits = 0; |
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this.html_pre = '<a href="'; |
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this.html_mid = '">'; |
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this.html_post = '</a><br/>'; |
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this.html_full_pre = ''; |
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this.html_full_post = ''; |
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if (! arr) { |
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this.debug("ERROR: can't search empty array"); |
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return; |
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} |
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var id_cache = Array(); |
this.arr = arr; |
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this.debug("index has "+this.arr.length+" parts"); |
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function element_id(id) { |
if (! arr.min_len) { |
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if (id_cache[id]) { |
this.results("ERROR: index structure problem"); |
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return id_cache[id]; |
return; |
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} else { |
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this.min_len = arr.min_len; |
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} |
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this.debug("index part has "+this.min_len+" parts"); |
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this.show_status(); |
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} |
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BFilter.prototype.element_id = function (id,no_alert) { |
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if (this.id_cache[id]) { |
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return this.id_cache[id]; |
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} else { |
} else { |
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var el = document.getElementById(id); |
var el = document.getElementById(id); |
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if (el) { |
if (el) { |
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id_cache[id] = el; |
this.id_cache[id] = el; |
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return el; |
return el; |
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} else { |
} else { |
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alert("can't find element id: "+id); |
if (! no_alert) { |
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alert("can't find element id: "+id); |
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} else { |
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// don't look it up again |
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this.id_cache[id] = null; |
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} |
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} |
} |
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} |
} |
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} |
} |
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// total number of hits |
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var hits = 0; |
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function show_status(status) { |
BFilter.prototype.show_status = function (status) { |
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var html; |
var html; |
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if (hits > 0) { |
if (this.hits > 0) { |
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html = "shown "+hits+" entries"; |
html = "shown "+this.hits+" entries"; |
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} else { |
} else { |
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html = "no results"; |
html = "no results"; |
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} |
} |
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if (! status) { |
if (! status) { |
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html = "Enter "+min_len+" letter"+(min_len == 1 ? '' : 's')+" to filter entries"; |
html = "Enter "+this.min_len+" letter"+(this.min_len == 1 ? '' : 's')+" to filter entries"; |
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status = ""; |
status = ""; |
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} |
} |
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var el = element_id("status"); |
var el = this.element_id("status"); |
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el.innerHTML = html+status+"\n"; |
el.innerHTML = html+status+"\n"; |
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} |
} |
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var wait = 0; |
BFilter.prototype.results = function (html,clean) { |
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function results(html,clean) { |
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if (! html) { html = ""; } |
if (! html) { html = ""; } |
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// results_div.style.cursor = 'wait'; // 'auto' |
// results_div.style.cursor = 'wait'; // 'auto' |
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var results_div = element_id("results"); |
var results_div = this.element_id("results"); |
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if (clean) { |
if (clean) { |
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results_div.innerHTML = html+"\n"; |
results_div.innerHTML = html + "\n"; |
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} else { |
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results_div.innerHTML += this.html_full_pre + html +"\n" + this.html_full_post; |
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} |
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} |
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BFilter.prototype.debug = function (html) { |
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//return; |
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// check if debugging is on |
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if (! html) { return 1; } |
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var debug_div = this.element_id("debug",1); |
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if (! debug_div) { return; } |
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if (debug_div.innerHTML) { |
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debug_div.innerHTML =+ html + "x<br>\n"; |
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} else { |
} else { |
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results_div.innerHTML += html+"\n"; |
debug_div.innerHTML = html + "y<br>\n"; |
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} |
} |
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} |
} |
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// modified binary search to find first element with substring |
// modified binary search to find first element with substring |
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function binarySearch(arr, find) { |
BFilter.prototype.binarySearch = function (arr, find) { |
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if (!arr || typeof (find) == "undefined" || !arr.length) { |
if (!arr || typeof (find) == "undefined" || !arr.length) { |
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return null; |
return null; |
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} |
} |
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var aTry = (mid < 1) ? 0 : parseInt(mid); |
var aTry = (mid < 1) ? 0 : parseInt(mid); |
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var curr = arr[aTry][1].substr(0,find.length).toLowerCase(); |
var curr = arr[aTry][1].substr(0,find.length).toLowerCase(); |
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if (debug) { results("low="+low+" high="+high+" lastTry="+lastTry+" "+aTry+": "+curr+"<br>"); } |
this.debug("low="+low+" high="+high+" lastTry="+lastTry+" "+aTry+": "+curr+"<br>"); |
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if (curr < find) { |
if (curr < find) { |
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low = aTry + 1; |
low = aTry + 1; |
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continue; |
continue; |
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} |
} |
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return aTry; |
return aTry; |
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} |
} |
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if (debug) { results("lastTry="+lastTry+"<br>"); } |
this.debug("lastTry="+lastTry+"<br>"); |
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if (typeof (lastTry) != "undefined") { |
if (typeof (lastTry) != "undefined") { |
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return lastTry; |
return lastTry; |
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} |
} |
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} |
} |
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function bfilter(document, id, find, arr) { |
BFilter.prototype.filter = function (document, find) { |
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results('',1); |
this.results('',1); |
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hits = 0; |
this.hits = 0; |
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if (find.length < min_len) { |
if (find.length < this.min_len) { |
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show_status(); |
this.show_status(); |
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return; |
return; |
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} |
} |
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if (debug) { results("filter: '"+find+"'<br>"); } |
this.debug("filter: '"+find+"'<br>"); |
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var find_lc = find.toLowerCase(); |
var find_lc = find.toLowerCase(); |
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var part = find_lc.substr(0,min_len); |
var part = find_lc.substr(0,this.min_len); |
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// no part found |
// no part found |
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if (! arr[part]) { |
if (! this.arr[part]) { |
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show_status(" for <em>"+find+"</em><br>"); |
this.show_status(" for <em>"+find+"</em><br>"); |
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this.debug("no part "+part); |
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return; |
return; |
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} |
} |
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//results("<img src=\"pie.gif\"> Please wait, filtering...\n",1); |
//results("<img src=\"pie.gif\"> Please wait, filtering...\n",1); |
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// full part? (optimization) |
// full part? (optimization) |
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if (find.length == min_len) { |
if (find.length == this.min_len) { |
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var html = ''; |
var html = ''; |
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for (var i = 0; i < arr[part].length; i++) { |
for (var i = 0; i < this.arr[part].length; i++) { |
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html += html_pre + |
html += this.html_pre + |
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arr[part][i][0] + |
this.arr[part][i][0] + |
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html_mid + |
this.html_mid + |
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(hits % 2 == 0 ? '<span style="background: #e0e0e0">' : ''); |
(this.hits % 2 == 0 ? '<span style="background: #e0e0e0">' : ''); |
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if (debug) { $html += i+": "; } |
if (this.debug()) { html += i+": "; } |
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html += arr[part][i][1] + |
html += this.arr[part][i][1] + |
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(hits % 2 == 0 ? '</span>' : '') + |
(this.hits % 2 == 0 ? '</span>' : '') + |
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html_post + "\n"; |
this.html_post + "\n"; |
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hits++; |
this.hits++; |
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} |
} |
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results(html); |
this.results(html); |
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} else { |
} else { |
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var from = binarySearch(arr[part], find_lc); |
var from = this.binarySearch(this.arr[part], find_lc); |
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if (from != null) { |
if (from != null) { |
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if (debug) { results("loop "+from+" ... "+arr[part].length)+"<br>\n"; } |
this.debug("loop "+from+" ... "+this.arr[part].length)+"<br>\n"; |
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var html = ''; |
var html = ''; |
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for(var i = from ; i < arr[part].length ; i++) { |
for(var i = from ; i < this.arr[part].length ; i++) { |
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if (arr[part][i][1].substring(0,find.length).toLowerCase() != find_lc) { |
if (this.arr[part][i][1].substring(0,find.length).toLowerCase() != find_lc) { |
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this.debug("loop exit at "+i); |
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break; |
break; |
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} |
} |
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html += html_pre + |
html += this.html_pre + |
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arr[part][i][0] + |
this.arr[part][i][0] + |
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html_mid + |
this.html_mid + |
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(hits % 2 == 0 ? '<span style="background: #e0e0e0">' : ''); |
(this.hits % 2 == 0 ? '<span style="background: #e0e0e0">' : ''); |
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if (debug) { html += i+": "; } |
if (this.debug()) { html += i+": "; } |
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html += arr[part][i][1] + |
html += this.arr[part][i][1] + |
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(hits % 2 == 0 ? '</span>' : '') + |
(this.hits % 2 == 0 ? '</span>' : '') + |
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html_post + "\n"; |
this.html_post + "\n"; |
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hits++; |
this.hits++; |
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} |
} |
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results(html); |
this.results(html); |
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} |
} |
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} |
} |
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show_status(" for <em>"+find+"</em>"); |
this.show_status(" for <em>"+find+"</em>"); |
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} |
} |
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