hinting.js

   1 /*
   2     (c) 2009 by Leon Winter
   3     (c) 2009, 2010 by Hannes Schueller
   4     (c) 2010 by Hans-Peter Deifel
   5     see LICENSE file
   6 */
   7
   8 function vimprobable_clearfocus() {
   9     if(document.activeElement && document.activeElement.blur)
  10         document.activeElement.blur();
  11 }
  12
  13 function vimprobable_show_hints(inputText) {
  14     if (document.getElementsByTagName("body")[0] !== null && typeof(document.getElementsByTagName("body")[0]) == "object") {
  15         var height = window.innerHeight;
  16         var width = window.innerWidth;
  17         var scrollX = document.defaultView.scrollX;
  18         var scrollY = document.defaultView.scrollY;
  19         /* prefixing html: will result in namespace error */
  20         var hinttags;
  21         if (typeof(inputText) == "undefined" || inputText == "") {
  22             hinttags = "//*[@onclick or @onmouseover or @onmousedown or @onmouseup or @oncommand or @class='lk' or @role='link' or @href] | //input[not(@type='hidden')] | //a | //area | //iframe | //textarea | //button | //select";
  23         } else {
  24             /* only elements which match the text entered so far */
  25             hinttags = "//*[(@onclick or @onmouseover or @onmousedown or @onmouseup or @oncommand or @class='lk' or @role='link' or @href) and contains(., '" + inputText + "')] | //input[not(@type='hidden') and contains(., '" + inputText + "')] | //a[contains(., '" + inputText + "')] | //area[contains(., '" + inputText + "')] | //iframe[contains(@name, '" + inputText + "')] | //textarea[contains(., '" + inputText + "')] | //button[contains(@value, '" + inputText + "')] | //select[contains(., '" + inputText + "')]";
  26         }
  27
  28         /* iterator type isn't suitable here, because: "DOMException NVALID_STATE_ERR: The document has been mutated since the result was returned." */
  29         var r = document.evaluate(hinttags, document,
  30             function(p) {
  31                 return 'http://www.w3.org/1999/xhtml';
  32             }, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
  33         div = document.createElement("div");
  34         /* due to the different XPath result type, we will need two counter variables */
  35         vimprobable_j = 0;
  36         var i;
  37         vimprobable_a = [];
  38         vimprobable_colors = [];
  39         vimprobable_backgrounds = [];
  40         for (i = 0; i < r.snapshotLength; i++)
  41         {
  42             var elem = r.snapshotItem(i);
  43             rect = elem.getBoundingClientRect();
  44             if (!rect || rect.top > height || rect.bottom < 0 || rect.left > width || rect.right < 0 || !(elem.getClientRects()[0]))
  45                 continue;
  46             var computedStyle = document.defaultView.getComputedStyle(elem, null);
  47             if (computedStyle.getPropertyValue("visibility") != "visible" || computedStyle.getPropertyValue("display") == "none")
  48                 continue;
  49             var leftpos = Math.max((rect.left + scrollX), scrollX);
  50             var toppos = Math.max((rect.top + scrollY), scrollY);
  51             vimprobable_a.push(elem);
  52             /* making this block DOM compliant */
  53             var hint = document.createElement("span");
  54             hint.setAttribute("class", "hinting_mode_hint");
  55             hint.setAttribute("id", "vimprobablehint" + vimprobable_j);
  56             hint.style.position = "absolute";
  57             hint.style.left = leftpos + "px";
  58             hint.style.top =  toppos + "px";
  59             hint.style.background = "red";
  60             hint.style.color = "#fff";
  61             hint.style.font = "bold 10px monospace";
  62             hint.style.zIndex = "99";
  63             var text = document.createTextNode(vimprobable_j + 1);
  64             hint.appendChild(text);
  65             div.appendChild(hint);
  66             /* remember site-defined colour of this element */
  67             vimprobable_colors[vimprobable_j] = elem.style.color;
  68             vimprobable_backgrounds[vimprobable_j] = elem.style.background;
  69             /* make the link black to ensure it's readable */
  70             elem.style.color = "#000";
  71             elem.style.background = "#ff0";
  72             vimprobable_j++;
  73         }
  74         i = 0;
  75         while (typeof(vimprobable_a[i]) != "undefined") {
  76             vimprobable_a[i].className += " hinting_mode_hint";
  77             i++;
  78         }
  79         document.getElementsByTagName("body")[0].appendChild(div);
  80         vimprobable_clearfocus();
  81         vimprobable_h = null;
  82         if (i == 1) {
  83             /* just one hinted element - might as well follow it */
  84             return vimprobable_fire(1);
  85         }
  86     }
  87 }
  88 function vimprobable_fire(n)
  89 {
  90     if (typeof(vimprobable_a[n - 1]) != "undefined") {
  91         el = vimprobable_a[n - 1];
  92         tag = el.nodeName.toLowerCase();
  93         vimprobable_clear();
  94         if(tag == "iframe" || tag == "frame" || tag == "textarea" || tag == "input" && (el.type == "text" || el.type == "password" || el.type == "checkbox" || el.type == "radio") || tag == "select") {
  95             el.focus();
  96             if (tag == "textarea" || tag == "input")
  97                 console.log('insertmode_on');
  98         } else {
  99             if (el.onclick) {
 100                 var evObj = document.createEvent('MouseEvents');
 101                 evObj.initMouseEvent('click', true, true, window, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, null);
 102                 el.dispatchEvent(evObj);
 103             } else if (el.href) {
 104                 if (el.href.match(/^javascript:/)) {
 105                     var evObj = document.createEvent('MouseEvents');
 106                     evObj.initMouseEvent('click', true, true, window, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, null);
 107                     el.dispatchEvent(evObj);
 108                 } else {
 109                     /* send signal to open link */
 110                     return "open;" + el.href;
 111                 }
 112             } else {
 113                 var evObj = document.createEvent('MouseEvents');
 114                 evObj.initMouseEvent('click', true, true, window, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, null);
 115                 el.dispatchEvent(evObj);
 116             }
 117         }
 118     }
 119 }
 120 function vimprobable_cleanup()
 121 {
 122     for(e in vimprobable_a) {
 123         if (typeof(vimprobable_a[e].className) != "undefined") {
 124             vimprobable_a[e].className = vimprobable_a[e].className.replace(/hinting_mode_hint/,'');
 125             /* reset to site-defined colour */
 126             vimprobable_a[e].style.color = vimprobable_colors[e];
 127             vimprobable_a[e].style.background = vimprobable_backgrounds[e];
 128         }
 129     }
 130     div.parentNode.removeChild(div);
 131     window.onkeyup = null;
 132 }
 133 function vimprobable_clear()
 134 {
 135     vimprobable_cleanup();
 136     console.log("hintmode_off")
 137 }
 138
 139 function vimprobable_update_hints(n)
 140 {
 141     if(vimprobable_h != null) {
 142         vimprobable_h.className = vimprobable_h.className.replace("_focus","");
 143         vimprobable_h.style.background = "#ff0";
 144     }
 145     if (vimprobable_j - 1 < n * 10 && typeof(vimprobable_a[n - 1]) != "undefined") {
 146         /* return signal to follow the link */
 147         return "fire;" + n;
 148     } else {
 149         if (typeof(vimprobable_a[n - 1]) != "undefined") {
 150             (vimprobable_h = vimprobable_a[n - 1]).className = vimprobable_a[n - 1].className.replace("hinting_mode_hint", "hinting_mode_hint_focus");
 151             vimprobable_h.style.background = "#8f0";
 152         }
 153     }
 154 }
 155
 156 function vimprobable_focus_input()
 157 {
 158     if (document.getElementsByTagName("body")[0] !== null && typeof(document.getElementsByTagName("body")[0]) == "object") {
 159         /* prefixing html: will result in namespace error */
 160         var hinttags = "//input[@type='text'] | //input[@type='password'] | //textarea";
 161         var r = document.evaluate(hinttags, document,
 162             function(p) {
 163                 return 'http://www.w3.org/1999/xhtml';
 164             }, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
 165         var i;
 166         var j = 0;
 167         var k = 0;
 168         var first = null;
 169         for (i = 0; i < r.snapshotLength; i++) {
 170             var elem = r.snapshotItem(i);
 171             if (k == 0) {
 172                 if (elem.style.display != "none" && elem.style.visibility != "hidden") {
 173                     first = elem;
 174                 } else {
 175                     k--;
 176                 }
 177             }
 178             if (j == 1 && elem.style.display != "none" && elem.style.visibility != "hidden") {
 179                 elem.focus();
 180                 var tag = elem.nodeName.toLowerCase();
 181                 if (tag == "textarea" || tag == "input")
 182                     console.log('insertmode_on');
 183                 break;
 184             } else {
 185                 if (elem == document.activeElement)
 186                     j = 1;
 187             }
 188             k++;
 189         }
 190         if (j == 0) {
 191             /* no appropriate field found focused - focus the first one */
 192             if (first !== null) {
 193                 first.focus();
 194                 var tag = elem.nodeName.toLowerCase();
 195                 if (tag == "textarea" || tag == "input")
 196                     console.log('insertmode_on');
 197             }
 198         }
 199     }
 200 }