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 function Hints() {
   8     const maxAllowedHints = 500;
   9
  10     var hintContainer;
  11     var currentFocusNum = 1;
  12     var hints = [];
  13     var mode;
  14
  15     this.createHints = function(inputText, hintMode)
  16     {
  17         if (hintMode) {
  18             mode = hintMode;
  19         }
  20
  21         var topwin = window;
  22         var top_height = topwin.innerHeight;
  23         var top_width = topwin.innerWidth;
  24         var xpath_expr;
  25
  26         var hintCount = 0;
  27         this.clearHints();
  28
  29         function helper (win, offsetX, offsetY) {
  30             var doc = win.document;
  31
  32             var win_height = win.height;
  33             var win_width = win.width;
  34
  35             /* Bounds */
  36             var minX = offsetX < 0 ? -offsetX : 0;
  37             var minY = offsetY < 0 ? -offsetY : 0;
  38             var maxX = offsetX + win_width > top_width ? top_width - offsetX : top_width;
  39             var maxY = offsetY + win_height > top_height ? top_height - offsetY : top_height;
  40
  41             var scrollX = win.scrollX;
  42             var scrollY = win.scrollY;
  43
  44             hintContainer = doc.createElement("div");
  45             hintContainer.id = "hint_container";
  46
  47             if (typeof(inputText) == "undefined" || inputText == "") {
  48                 xpath_expr = "//*[@onclick or @onmouseover or @onmousedown or @onmouseup or @oncommand or @class='lk' or @role='link' or @href] | //input[not(@type='hidden')] | //a | //area | //textarea | //button | //select";
  49             } else {
  50                 xpath_expr = "//*[(@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 + "')] |  //textarea[contains(., '" + inputText + "')] | //button[contains(@value, '" + inputText + "')] | //select[contains(., '" + inputText + "')]";
  51             }
  52
  53             var res = doc.evaluate(xpath_expr, doc,
  54                 function (p) {
  55                     return "http://www.w3.org/1999/xhtml";
  56                 }, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
  57
  58             /* generate basic hint element which will be cloned and updated later */
  59             var hintSpan = doc.createElement("span");
  60             hintSpan.setAttribute("class", "hinting_mode_hint");
  61             hintSpan.style.position = "absolute";
  62             hintSpan.style.background = "red";
  63             hintSpan.style.color = "#fff";
  64             hintSpan.style.font = "bold 10px monospace";
  65             hintSpan.style.zIndex = "10000000";
  66
  67             /* due to the different XPath result type, we will need two counter variables */
  68             var rect, elem, text, node, show_text;
  69             for (var i = 0; i < res.snapshotLength; i++)
  70             {
  71                 if (hintCount >= maxAllowedHints)
  72                     break;
  73
  74                 elem = res.snapshotItem(i);
  75                 rect = elem.getBoundingClientRect();
  76                 if (!rect || rect.left > maxX || rect.right < minX || rect.top > maxY || rect.bottom < minY)
  77                     continue;
  78
  79                 var style = topwin.getComputedStyle(elem, "");
  80                 if (style.display == "none" || style.visibility != "visible")
  81                     continue;
  82
  83                 var leftpos = Math.max((rect.left + scrollX), scrollX);
  84                 var toppos = Math.max((rect.top + scrollY), scrollY);
  85
  86                 /* process elements text */
  87                 text = _getTextFromElement(elem);
  88
  89                 /* making this block DOM compliant */
  90                 var hint = hintSpan.cloneNode(false);
  91                 hint.setAttribute("id", "vimprobablehint" + hintCount);
  92                 hint.style.left = leftpos + "px";
  93                 hint.style.top =  toppos + "px";
  94                 text = doc.createTextNode(hintCount + 1);
  95                 hint.appendChild(text);
  96
  97                 hintContainer.appendChild(hint);
  98                 hintCount++;
  99                 hints.push({
 100                     elem:       elem,
 101                     number:     hintCount,
 102                     text:       text,
 103                     span:       hint,
 104                     background: elem.style.background,
 105                     foreground: elem.style.color}
 106                 );
 107
 108                 /* make the link black to ensure it's readable */
 109                 elem.style.color = "#000";
 110                 elem.style.background = "#ff0";
 111             }
 112
 113             doc.documentElement.appendChild(hintContainer);
 114
 115             /* recurse into any iframe or frame element */
 116             var frameTags = ["frame","iframe"];
 117             for (var i in frameTags) {
 118                 var frames = doc.getElementsByTagName(frameTags[i]);
 119                 for (var i = 0, nframes = frames.length; i < nframes; ++i) {
 120                     elem = frames[i];
 121                     rect = elem.getBoundingClientRect();
 122                     if (!elem.contentWindow || !rect || rect.left > maxX || rect.right < minX || rect.top > maxY || rect.bottom < minY)
 123                         continue;
 124                     helper(elem.contentWindow, offsetX + rect.left, offsetY + rect.top);
 125                 }
 126             }
 127         }
 128
 129         helper(topwin, 0, 0);
 130
 131         this.clearFocus();
 132         this.focusHint(1);
 133         if (hintCount == 1) {
 134             /* just one hinted element - might as well follow it */
 135             return this.fire(1);
 136         }
 137     };
 138
 139     /* set focus on hint with given number */
 140     this.focusHint = function(n)
 141     {
 142         /* reset previous focused hint */
 143         var hint = _getHintByNumber(currentFocusNum);
 144         if (hint !== null) {
 145             hint.elem.className = hint.elem.className.replace("hinting_mode_hint_focus", "hinting_mode_hint");
 146             hint.elem.style.background = "#ff0";
 147         }
 148
 149         currentFocusNum = n;
 150
 151         /* mark new hint as focused */
 152         var hint = _getHintByNumber(currentFocusNum);
 153         if (hint !== null) {
 154             hint.elem.className = hint.elem.className.replace("hinting_mode_hint", "hinting_mode_hint_focus");
 155             hint.elem.style.background = "#8f0";
 156         }
 157     };
 158
 159     /* set focus to next avaiable hint */
 160     this.focusNextHint = function()
 161     {
 162         var index = _getHintIdByNumber(currentFocusNum);
 163
 164         if (typeof(hints[index + 1]) != "undefined") {
 165             this.focusHint(hints[index + 1].number);
 166         } else {
 167             this.focusHint(hints[0].number);
 168         }
 169     };
 170
 171     /* set focus to previous avaiable hint */
 172     this.focusPreviousHint = function()
 173     {
 174         var index = _getHintIdByNumber(currentFocusNum);
 175         if (index != 0 && typeof(hints[index - 1].number) != "undefined") {
 176             this.focusHint(hints[index - 1].number);
 177         } else {
 178             this.focusHint(hints[hints.length - 1].number);
 179         }
 180     };
 181
 182     /* filters hints matching given number */
 183     this.updateHints = function(n)
 184     {
 185         if (n == 0) {
 186             this.createHints();
 187             return;
 188         }
 189         /* remove none matching hints */
 190         var remove = [];
 191         for (e in hints) {
 192             var hint = hints[e];
 193             if (0 != hint.number.toString().indexOf(n.toString())) {
 194                 remove.push(hint.number);
 195             }
 196         }
 197
 198         for (var i = 0; i < remove.length; ++i) {
 199             _removeHint(remove[i]);
 200         }
 201
 202         if (hints.length === 1) {
 203             this.fire(hints[0].number);
 204         } else {
 205             this.focusHint(n);
 206         }
 207     };
 208
 209     this.clearFocus = function()
 210     {
 211         if (document.activeElement && document.activeElement.blur) {
 212             document.activeElement.blur();
 213         }
 214     };
 215
 216     /* remove all hints and set previous style to them */
 217     this.clearHints = function()
 218     {
 219         if (hints.length == 0) {
 220             return;
 221         }
 222         for (e in hints) {
 223             var hint = hints[e];
 224             if (typeof(hint.elem) != "undefined") {
 225                 hint.elem.style.background = hint.background;
 226                 hint.elem.style.color = hint.foreground;
 227                 hint.span.parentNode.removeChild(hint.span);
 228             }
 229         }
 230         hints = [];
 231         hintContainer.parentNode.removeChild(hintContainer);
 232         window.onkeyup = null;
 233     };
 234
 235     /* fires the modeevent on hint with given number */
 236     this.fire = function(n)
 237     {
 238         var doc, result;
 239         if (!n) {
 240             var n = currentFocusNum;
 241         }
 242         var hint = _getHintByNumber(n);
 243         if (typeof(hint.elem) == "undefined")
 244             return "done;";
 245
 246         var el = hint.elem;
 247         var tag = el.nodeName.toLowerCase();
 248
 249         this.clearHints();
 250
 251         if (tag == "iframe" || tag == "frame" || tag == "textarea" || tag == "input" && (el.type == "text" || el.type == "password" || el.type == "checkbox" || el.type == "radio") || tag == "select") {
 252             el.focus();
 253             return "done;";
 254         }
 255
 256         switch (mode)
 257         {
 258             case "f": result = _open(el); break;
 259             case "F": result = _openNewWindow(el); break;
 260             default:  result = _getElemtSource(el);
 261         }
 262
 263         return result;
 264     };
 265
 266     this.focusInput = function()
 267     {
 268         if (document.getElementsByTagName("body")[0] === null || typeof(document.getElementsByTagName("body")[0]) != "object")
 269             return;
 270
 271         /* prefixing html: will result in namespace error */
 272         var hinttags = "//input[@type='text'] | //input[@type='password'] | //textarea";
 273         var r = document.evaluate(hinttags, document,
 274             function(p) {
 275                 return "http://www.w3.org/1999/xhtml";
 276             }, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
 277         var i;
 278         var j = 0;
 279         var k = 0;
 280         var first = null;
 281         for (i = 0; i < r.snapshotLength; i++) {
 282             var elem = r.snapshotItem(i);
 283             if (k == 0) {
 284                 if (elem.style.display != "none" && elem.style.visibility != "hidden") {
 285                     first = elem;
 286                 } else {
 287                     k--;
 288                 }
 289             }
 290             if (j == 1 && elem.style.display != "none" && elem.style.visibility != "hidden") {
 291                 elem.focus();
 292                 break;
 293             }
 294             if (elem == document.activeElement) {
 295                 j = 1;
 296             }
 297             k++;
 298         }
 299         /* no appropriate field found focused - focus the first one */
 300         if (j == 0 && first !== null)
 301             first.focus();
 302     };
 303
 304     /* retrieves text content fro given element */
 305     function _getTextFromElement(el)
 306     {
 307         if (el instanceof HTMLInputElement || el instanceof HTMLTextAreaElement) {
 308             text = el.value;
 309         } else if (el instanceof HTMLSelectElement) {
 310             if (el.selectedIndex >= 0) {
 311                 text = el.item(el.selectedIndex).text;
 312             } else{
 313                 text = "";
 314             }
 315         } else {
 316             text = el.textContent;
 317         }
 318         return text.toLowerCase();;
 319     }
 320
 321     /* retrieves the hint for given hint number */
 322     function _getHintByNumber(n)
 323     {
 324         var index = _getHintIdByNumber(n);
 325         if (index !== null) {
 326             return hints[index];
 327         }
 328         return null;
 329     }
 330
 331     /* retrieves the id of hint with given number */
 332     function _getHintIdByNumber(n)
 333     {
 334         for (var i = 0; i < hints.length; ++i) {
 335             var hint = hints[i];
 336             if (hint.number === n) {
 337                 return i;
 338             }
 339         }
 340         return null;
 341     }
 342
 343     /* removes hint with given number from hints array */
 344     function _removeHint(n)
 345     {
 346         var index = _getHintIdByNumber(n);
 347         if (index === null) {
 348             return;
 349         }
 350         var hint = hints[index];
 351         if (hint.number === n) {
 352             hint.elem.style.background = hint.background;
 353             hint.elem.style.color = hint.foreground;
 354             hint.span.parentNode.removeChild(hint.span);
 355
 356             /* remove hints from all hints */
 357             hints.splice(index, 1);
 358         }
 359     }
 360
 361     /* opens given element */
 362     function _open(elem)
 363     {
 364         _clickElement(elem);
 365         return "done;";
 366     }
 367
 368     /* opens given element into new window */
 369     function _openNewWindow(elem)
 370     {
 371         var oldTarget = elem.target;
 372
 373         /* set target to open in new window */
 374         elem.target = "_blank";
 375         _clickElement(elem);
 376         elem.target = oldTarget;
 377
 378         return "done;";
 379     }
 380
 381     /* fire moudedown and click event on given element */
 382     function _clickElement(elem)
 383     {
 384         doc = elem.ownerDocument;
 385         view = elem.contentWindow;
 386
 387         var evObj = doc.createEvent("MouseEvents");
 388         evObj.initMouseEvent("mousedown", true, true, view, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, null);
 389         elem.dispatchEvent(evObj);
 390
 391         var evObj = doc.createEvent("MouseEvents");
 392         evObj.initMouseEvent("click", true, true, view, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, null);
 393         elem.dispatchEvent(evObj);
 394     }
 395
 396     /* retrieves the url of given element */
 397     function _getElemtSource(elem)
 398     {
 399         var url = elem.href || elem.src;
 400         return url;
 401     }
 402 }
 403 hints = new Hints();