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dpavlin |
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/* |
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simple yet powerful implementation of show/hide effect |
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with history navigation (back/forward/default) |
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Dobrica Pavlinusic <dpavlin@rot13.org> 2004-09-12 |
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*/ |
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var changed_display_ids = []; |
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var changed_display_pos = 0; |
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var id_cache = []; |
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var debug_on = true; |
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function debug(text) { |
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if (debug_on) debug_on = confirm(text); |
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} |
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function element_id(id) { |
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//debug("id: "+id); |
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if (id_cache[id]) { |
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//debug("from cache "+id+" == "+id_cache[id]); |
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return id_cache[id]; |
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} else { |
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var el = self.document.getElementById(id); |
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//debug("getElementById("+id+") == "+el); |
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if (el) { |
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id_cache[id] = el; |
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return el; |
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} |
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//} else debug("can't find element "+id); |
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} |
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return null; |
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} |
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function toggle_display(name,dont_save) { |
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var el = element_id(name); |
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if (el) { |
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//debug("toggle "+name+" == "+el.id+" current: '"+el.style.display+"'"); |
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if (el.style.display=='none') |
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el.style.display = ''; |
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else |
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el.style.display = 'none'; |
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if (! dont_save) changed_display_ids[changed_display_pos++] = name; |
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} |
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return false; |
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} |
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function default_display() { |
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if (changed_display_pos == 0) return null; |
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for (var i = 0; i < changed_display_pos; i++) { |
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toggle_display( changed_display_ids[i], 1 ); |
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} |
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changed_display_pos = 0; |
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return false; |
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} |
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function back_display() { |
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if (changed_display_pos == 0) { |
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alert("can't go back in history"); |
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return; |
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} |
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toggle_display( changed_display_ids[--changed_display_pos], 1 ); |
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} |
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function forward_display() { |
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if (changed_display_pos == changed_display_ids.length) { |
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alert("can't go forward in history"); |
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return; |
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} |
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toggle_display( changed_display_ids[changed_display_pos++], 1 ); |
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} |
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function reset_changed() { |
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changed_display_ids.length = 0; |
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changed_display_pos = 0; |
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} |
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function set_display(name,display) { |
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var el = element_id(name); |
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if (el) el.style.display = display |
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else alert("can't set_display("+name+","+display+")"); |
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return false; |
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} |
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function show_display(show) { |
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for (var i = 0; i < show.length; i++) { |
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set_display(show[i],''); |
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} |
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reset_changed(); |
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} |
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function hide_display(hide) { |
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for (var i = 0; i < hide.length; i++) { |
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set_display(hide[i],'none'); |
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} |
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reset_changed(); |
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} |
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function show_hide_display(show,hide) { |
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show_display(show); |
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hide_display(hide); |
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} |
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function outline_display(name) { |
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var el = element_id(name); |
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//debug("outline "+name); |
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if (el) { |
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el.style.backgroundColor = "#ffff66"; |
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//el.style.border = "1px dashed #c0c0c0"; |
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if (el.style.display=='none') toggle_display(el.id); |
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// recursivly show elements to root |
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while (el.parentNode) { |
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el=el.parentNode; |
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if (el.style && el.style.display=='none') toggle_display(el.id); |
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} |
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} |
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} |
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