themes/base/htdocs/luci-static/resources/Dropdowns.js

   1 /*
   2 Copyright (C) 2008  Alina Friedrichsen <x-alina@gmx.net>
   3
   4 Redistribution and use in source and binary forms, with or without
   5 modification, are permitted provided that the following conditions
   6 are met:
   7 1. Redistributions of source code must retain the above copyright
   8    notice, this list of conditions and the following disclaimer.
   9 2. Redistributions in binary form must reproduce the above copyright
  10    notice, this list of conditions and the following disclaimer in the
  11    documentation and/or other materials provided with the distribution.
  12
  13 THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  14 ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  16 ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  17 FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  18 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  19 OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  20 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  21 LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  22 OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  23 SUCH DAMAGE.
  24 */
  25
  26 function initDropdowns() {
  27         var aSelects = XHTML1.getElementsByTagName("select");
  28         var isIE6 = false /*@cc_on || @_jscript_version < 5.7 @*/;
  29
  30         function showPlaceholder(sel) {
  31                 if( ! sel._ph ) {
  32                         var box = sel.getBoundingClientRect();
  33                         sel._dm = sel.currentStyle.display;
  34                         sel._ph = document.createElement('input');
  35                         sel.parentNode.insertBefore(sel._ph, sel);
  36                         sel._ph.style.width  = ( box.right - box.left ) + 'px';
  37                         sel._ph.style.height = ( box.bottom - box.top ) + 'px';
  38                         sel._ph.style.margin = sel.currentStyle.margin;
  39                 }
  40
  41                 sel._ph.value = sel.options[sel.selectedIndex].text;
  42                 sel._ph.style.display = sel._dm;
  43                 sel.style.display = 'none';
  44         }
  45
  46         function hidePlaceholder(sel) {
  47                 if( sel._ph ) sel._ph.style.display = 'none';
  48                 sel.style.display = sel._dm;
  49         }
  50
  51         function hideSelects() {
  52                 for(var i = 0; i < aSelects.length; i++) {
  53                         showPlaceholder(aSelects[i]);
  54                 }
  55         }
  56
  57         function showSelects() {
  58                 for(var i = 0; i < aSelects.length; i++) {
  59                         hidePlaceholder(aSelects[i]);
  60                 }
  61         }
  62
  63         function isEmptyObject(obj) {
  64                 for(var i in obj) {
  65                         return false;
  66                 }
  67                 return true;
  68         }
  69
  70         var nextUniqueID = 1;
  71         var elementsNeeded = {};
  72         var menusShown = {};
  73         var menusToHide = {};
  74         var delayHideTimerId;
  75         var delayHideAllTime = 1000;
  76         var delayHideTime = 400;
  77         function delayHide() {
  78                 for(var i in menusToHide) {
  79                         XHTML1.removeClass(menusToHide[i], "focus");
  80                 }
  81                 delayHideTimerId = null;
  82         }
  83
  84         function updatePopup() {
  85                 if(isIE6) {
  86                         if(isEmptyObject(elementsNeeded)) {
  87                                 showSelects();
  88                         }
  89                         else{
  90                                 hideSelects();
  91                         }
  92                 }
  93
  94                 var menusShownOld = menusShown;
  95                 menusShown = {};
  96                 for(var id in elementsNeeded) {
  97                         var element = elementsNeeded[id];
  98                         for(element = findLi(element); element; element = findLi(element.parentNode)) {
  99                                 XHTML1.addClass(element, "focus");
 100                                 if(!element.uniqueID) {
 101                                         element.uniqueID = nextUniqueID++;
 102                                 }
 103                                 element.style.zIndex = 1000;
 104                                 menusShown[element.uniqueID] = element;
 105                                 delete menusToHide[element.uniqueID];
 106                         }
 107                 }
 108                 for(var id in menusShownOld) {
 109                         if(!menusShown[id]) {
 110                                 if(delayHideTimerId) {
 111                                         clearTimeout(delayHideTimerId);
 112                                         delayHideTimerId = 0;
 113                                         delayHide();
 114                                 }
 115                                 menusToHide[id] = menusShownOld[id];
 116                                 menusToHide[id].style.zIndex = 999;
 117                         }
 118                 }
 119                 if(menusToHide || isEmptyObject(elementsNeeded)) {
 120                         if(delayHideTimerId) {
 121                                 clearTimeout(delayHideTimerId);
 122                         }
 123                         delayHideTimerId = setTimeout(delayHide, isEmptyObject(elementsNeeded) ? delayHideAllTime : delayHideTime);
 124                 }
 125         }
 126
 127         function findLi(element) {
 128                 for(; element; element = element.parentNode) {
 129                         if(XHTML1.isElement(element, "li")) {
 130                                 return element;
 131                         }
 132                 }
 133         }
 134
 135         function onmouseover(evt) {
 136                 var li = findLi(evt.currentTarget);
 137                 if(li && !li.focused) {
 138                         if(!li.uniqueID) {
 139                                 li.uniqueID = nextUniqueID++;
 140                         }
 141                         elementsNeeded[li.uniqueID] = li;
 142                 }
 143                 XHTML1.addClass(evt.currentTarget, "over");
 144                 updatePopup();
 145         }
 146
 147         function onmouseout(evt) {
 148                 var li = findLi(evt.currentTarget);
 149                 if(li && !li.focused && li.uniqueID) {
 150                         delete elementsNeeded[li.uniqueID];
 151                 }
 152                 XHTML1.removeClass(evt.currentTarget, "over");
 153                 updatePopup();
 154         }
 155
 156         function onfocus(evt) {
 157                 var li = findLi(evt.currentTarget);
 158                 if(li) {
 159                         li.focused = true;
 160                         if(!li.uniqueID) {
 161                                 li.uniqueID = nextUniqueID++;
 162                         }
 163                         elementsNeeded[li.uniqueID] = li;
 164                 }
 165                 updatePopup();
 166         }
 167
 168         function onblur(evt) {
 169                 var li = findLi(evt.currentTarget);
 170                 if(li) {
 171                         li.focused = false;
 172                         delete elementsNeeded[li.uniqueID];
 173                 }
 174                 updatePopup();
 175         }
 176
 177         var aElements = XHTML1.getElementsByTagName("a");
 178         for(var i = 0; i < aElements.length; i++) {
 179                 var a = aElements[i];
 180                 for(var element = a.parentNode; element; element = element.parentNode) {
 181                         if(XHTML1.isElement(element, "ul") && XHTML1.containsClass(element, "dropdowns")) {
 182                                 XHTML1.addEventListener(a, "focus", onfocus);
 183                                 XHTML1.addEventListener(a, "blur", onblur);
 184                                 XHTML1.addEventListener(a, "mouseover", onmouseover);
 185                                 XHTML1.addEventListener(a, "mouseout", onmouseout);
 186                                 break;
 187                         }
 188                 }
 189         }
 190 }
 191
 192 if(XHTML1.isDOMSupported()) {
 193         XHTML1.addEventListener(window, "load", initDropdowns);
 194 }