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dpavlin |
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/* |
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Fast filtering function using pre-sorted list elements |
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Dobrica Pavlinusic, dpavlin@rot13.org 2004-09-06 |
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*/ |
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function bfilter_init() { |
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show_status(); |
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} |
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var id_cache = Array(); |
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function element_id(id) { |
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if (id_cache[id]) { |
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return id_cache[id]; |
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} else { |
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var el = document.getElementById(id); |
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if (el) { |
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id_cache[id] = el; |
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return el; |
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} else { |
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alert("can't find element id: "+id); |
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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) { |
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var html; |
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if (hits > 0) { |
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html = "shown "+hits+" entries"; |
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} else { |
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html = "no results"; |
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} |
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if (! status) { |
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html = "Enter "+min_len+" letter"+(min_len == 1 ? '' : 's')+" to filter entries"; |
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status = ""; |
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} |
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var el = element_id("status"); |
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el.innerHTML = html+status+"\n"; |
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} |
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var wait = 0; |
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function results(html,clean) { |
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if (! html) { html = ""; } |
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// results_div.style.cursor = 'wait'; // 'auto' |
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var results_div = element_id("results"); |
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if (clean) { |
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results_div.innerHTML = html+"\n"; |
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} else { |
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results_div.innerHTML += html+"\n"; |
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} |
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} |
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function bfilter(document, id, find, arr) { |
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var debug = 0; |
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results('',1); |
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hits = 0; |
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if (find.length < min_len) { |
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show_status(); |
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return; |
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} |
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if (debug) { results("filter: '"+find+"'<br>"); } |
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var find_lc = find.toLowerCase(); |
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var part = find_lc.substr(0,min_len); |
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// no part found |
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if (! arr[part]) { |
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show_status(" for <em>"+find+"</em><br>"); |
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return; |
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} |
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// start anim icon |
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//results("<img src=\"pie.gif\"> Please wait, filtering...\n",1); |
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// full part? (optimization) |
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if (find.length == min_len) { |
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var html = ''; |
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for (var i = 0; i < arr[part].length; i++) { |
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html += "<li>"+arr[part][i]+"</li>\n"; |
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hits++; |
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} |
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results(html); |
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} else { |
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for (var i = 0; i < arr[part].length; i++) { |
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var text = arr[part][i].toLowerCase(); |
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if (debug) { results(part+" "+i+": "+text); } |
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// get li element by ID |
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if (debug) { results("cmp: "+text.substring(0,find.length)+" "+find+" ["+text+"]<br>\n"); } |
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if (text.substring(0,find.length) == find_lc) { |
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results("<li>"+text+"</li>\n"); |
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hits++; |
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} |
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} |
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} |
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// clean clock if no results |
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if (hits == 0) { results("",1); } |
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show_status(" for <em>"+find+"</em>"); |
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} |
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