resources/src/jquery/jquery.textSelection.js

   1 /**
   2  * These plugins provide extra functionality for interaction with textareas.
   3  */
   4 ( function ( $ ) {
   5         if ( document.selection && document.selection.createRange ) {
   6                 // On IE, patch the focus() method to restore the windows' scroll position
   7                 // (bug 32241)
   8                 $.fn.extend( {
   9                         focus: ( function ( jqFocus ) {
  10                                 return function () {
  11                                         var $w, state, result;
  12                                         if ( arguments.length === 0 ) {
  13                                                 $w = $( window );
  14                                                 state = { top: $w.scrollTop(), left: $w.scrollLeft() };
  15                                                 result = jqFocus.apply( this, arguments );
  16                                                 window.scrollTo( state.top, state.left );
  17                                                 return result;
  18                                         }
  19                                         return jqFocus.apply( this, arguments );
  20                                 };
  21                         }( $.fn.focus ) )
  22                 } );
  23         }
  24
  25         $.fn.textSelection = function ( command, options ) {
  26                 var fn,
  27                         alternateFn,
  28                         context,
  29                         hasWikiEditor,
  30                         needSave,
  31                         retval;
  32
  33                 /**
  34                  * Helper function to get an IE TextRange object for an element
  35                  */
  36                 function rangeForElementIE( e ) {
  37                         var sel;
  38                         if ( e.nodeName.toLowerCase() === 'input' ) {
  39                                 return e.createTextRange();
  40                         } else {
  41                                 sel = document.body.createTextRange();
  42                                 sel.moveToElementText( e );
  43                                 return sel;
  44                         }
  45                 }
  46
  47                 /**
  48                  * Helper function for IE for activating the textarea. Called only in the
  49                  * IE-specific code paths below; makes use of IE-specific non-standard
  50                  * function setActive() if possible to avoid screen flicker.
  51                  */
  52                 function activateElementOnIE( element ) {
  53                         if ( element.setActive ) {
  54                                 element.setActive(); // bug 32241: doesn't scroll
  55                         } else {
  56                                 $( element ).focus(); // may scroll (but we patched it above)
  57                         }
  58                 }
  59
  60                 fn = {
  61                         /**
  62                          * Get the contents of the textarea
  63                          */
  64                         getContents: function () {
  65                                 return this.val();
  66                         },
  67                         /**
  68                          * Set the contents of the textarea, replacing anything that was there before
  69                          */
  70                         setContents: function ( content ) {
  71                                 this.val( content );
  72                         },
  73                         /**
  74                          * Get the currently selected text in this textarea. Will focus the textarea
  75                          * in some browsers (IE/Opera)
  76                          */
  77                         getSelection: function () {
  78                                 var retval, range,
  79                                         el = this.get( 0 );
  80
  81                                 if ( !el || $( el ).is( ':hidden' ) ) {
  82                                         retval = '';
  83                                 } else if ( document.selection && document.selection.createRange ) {
  84                                         activateElementOnIE( el );
  85                                         range = document.selection.createRange();
  86                                         retval = range.text;
  87                                 } else if ( el.selectionStart || el.selectionStart === 0 ) {
  88                                         retval = el.value.substring( el.selectionStart, el.selectionEnd );
  89                                 }
  90
  91                                 return retval;
  92                         },
  93                         /**
  94                          * Ported from skins/common/edit.js by Trevor Parscal
  95                          * (c) 2009 Wikimedia Foundation (GPLv2) - http://www.wikimedia.org
  96                          *
  97                          * Inserts text at the beginning and end of a text selection, optionally
  98                          * inserting text at the caret when selection is empty.
  99                          *
 100                          * FIXME document the options parameters
 101                          */
 102                         encapsulateSelection: function ( options ) {
 103                                 return this.each( function () {
 104                                         var selText, scrollTop, insertText,
 105                                                 isSample, range, range2, range3, startPos, endPos,
 106                                                 pre = options.pre,
 107                                                 post = options.post;
 108
 109                                         /**
 110                                          * Check if the selected text is the same as the insert text
 111                                          */
 112                                         function checkSelectedText() {
 113                                                 if ( !selText ) {
 114                                                         selText = options.peri;
 115                                                         isSample = true;
 116                                                 } else if ( options.replace ) {
 117                                                         selText = options.peri;
 118                                                 } else {
 119                                                         while ( selText.charAt( selText.length - 1 ) === ' ' ) {
 120                                                                 // Exclude ending space char
 121                                                                 selText = selText.slice( 0, -1 );
 122                                                                 post += ' ';
 123                                                         }
 124                                                         while ( selText.charAt( 0 ) === ' ' ) {
 125                                                                 // Exclude prepending space char
 126                                                                 selText = selText.slice( 1 );
 127                                                                 pre = ' ' + pre;
 128                                                         }
 129                                                 }
 130                                         }
 131
 132                                         /**
 133                                          * Do the splitlines stuff.
 134                                          *
 135                                          * Wrap each line of the selected text with pre and post
 136                                          */
 137                                         function doSplitLines( selText, pre, post ) {
 138                                                 var i,
 139                                                         insertText = '',
 140                                                         selTextArr = selText.split( '\n' );
 141                                                 for ( i = 0; i < selTextArr.length; i++ ) {
 142                                                         insertText += pre + selTextArr[ i ] + post;
 143                                                         if ( i !== selTextArr.length - 1 ) {
 144                                                                 insertText += '\n';
 145                                                         }
 146                                                 }
 147                                                 return insertText;
 148                                         }
 149
 150                                         isSample = false;
 151                                         // Do nothing if display none
 152                                         if ( this.style.display !== 'none' ) {
 153                                                 if ( document.selection && document.selection.createRange ) {
 154                                                         // IE
 155
 156                                                         // Note that IE9 will trigger the next section unless we check this first.
 157                                                         // See bug 35201.
 158
 159                                                         activateElementOnIE( this );
 160                                                         if ( context ) {
 161                                                                 context.fn.restoreCursorAndScrollTop();
 162                                                         }
 163                                                         if ( options.selectionStart !== undefined ) {
 164                                                                 $( this ).textSelection( 'setSelection', { start: options.selectionStart, end: options.selectionEnd } );
 165                                                         }
 166
 167                                                         selText = $( this ).textSelection( 'getSelection' );
 168                                                         scrollTop = this.scrollTop;
 169                                                         range = document.selection.createRange();
 170
 171                                                         checkSelectedText();
 172                                                         insertText = pre + selText + post;
 173                                                         if ( options.splitlines ) {
 174                                                                 insertText = doSplitLines( selText, pre, post );
 175                                                         }
 176                                                         if ( options.ownline && range.moveStart ) {
 177                                                                 range2 = document.selection.createRange();
 178                                                                 range2.collapse();
 179                                                                 range2.moveStart( 'character', -1 );
 180                                                                 // FIXME: Which check is correct?
 181                                                                 if ( range2.text !== '\r' && range2.text !== '\n' && range2.text !== '' ) {
 182                                                                         insertText = '\n' + insertText;
 183                                                                         pre += '\n';
 184                                                                 }
 185                                                                 range3 = document.selection.createRange();
 186                                                                 range3.collapse( false );
 187                                                                 range3.moveEnd( 'character', 1 );
 188                                                                 if ( range3.text !== '\r' && range3.text !== '\n' && range3.text !== '' ) {
 189                                                                         insertText += '\n';
 190                                                                         post += '\n';
 191                                                                 }
 192                                                         }
 193
 194                                                         range.text = insertText;
 195                                                         if ( isSample && options.selectPeri && range.moveStart ) {
 196                                                                 range.moveStart( 'character', -post.length - selText.length );
 197                                                                 range.moveEnd( 'character', -post.length );
 198                                                         }
 199                                                         range.select();
 200                                                         // Restore the scroll position
 201                                                         this.scrollTop = scrollTop;
 202                                                 } else if ( this.selectionStart || this.selectionStart === 0 ) {
 203                                                         // Mozilla/Opera
 204
 205                                                         $( this ).focus();
 206                                                         if ( options.selectionStart !== undefined ) {
 207                                                                 $( this ).textSelection( 'setSelection', { start: options.selectionStart, end: options.selectionEnd } );
 208                                                         }
 209
 210                                                         selText = $( this ).textSelection( 'getSelection' );
 211                                                         startPos = this.selectionStart;
 212                                                         endPos = this.selectionEnd;
 213                                                         scrollTop = this.scrollTop;
 214                                                         checkSelectedText();
 215                                                         if (
 216                                                                 options.selectionStart !== undefined &&
 217                                                                 endPos - startPos !== options.selectionEnd - options.selectionStart
 218                                                         ) {
 219                                                                 // This means there is a difference in the selection range returned by browser and what we passed.
 220                                                                 // This happens for Chrome in the case of composite characters. Ref bug #30130
 221                                                                 // Set the startPos to the correct position.
 222                                                                 startPos = options.selectionStart;
 223                                                         }
 224
 225                                                         insertText = pre + selText + post;
 226                                                         if ( options.splitlines ) {
 227                                                                 insertText = doSplitLines( selText, pre, post );
 228                                                         }
 229                                                         if ( options.ownline ) {
 230                                                                 if ( startPos !== 0 && this.value.charAt( startPos - 1 ) !== '\n' && this.value.charAt( startPos - 1 ) !== '\r' ) {
 231                                                                         insertText = '\n' + insertText;
 232                                                                         pre += '\n';
 233                                                                 }
 234                                                                 if ( this.value.charAt( endPos ) !== '\n' && this.value.charAt( endPos ) !== '\r' ) {
 235                                                                         insertText += '\n';
 236                                                                         post += '\n';
 237                                                                 }
 238                                                         }
 239                                                         this.value = this.value.slice( 0, startPos ) + insertText +
 240                                                                 this.value.slice( endPos );
 241                                                         // Setting this.value scrolls the textarea to the top, restore the scroll position
 242                                                         this.scrollTop = scrollTop;
 243                                                         if ( window.opera ) {
 244                                                                 pre = pre.replace( /\r?\n/g, '\r\n' );
 245                                                                 selText = selText.replace( /\r?\n/g, '\r\n' );
 246                                                                 post = post.replace( /\r?\n/g, '\r\n' );
 247                                                         }
 248                                                         if ( isSample && options.selectPeri && ( !options.splitlines || ( options.splitlines && selText.indexOf( '\n' ) === -1 ) ) ) {
 249                                                                 this.selectionStart = startPos + pre.length;
 250                                                                 this.selectionEnd = startPos + pre.length + selText.length;
 251                                                         } else {
 252                                                                 this.selectionStart = startPos + insertText.length;
 253                                                                 this.selectionEnd = this.selectionStart;
 254                                                         }
 255                                                 }
 256                                         }
 257                                         $( this ).trigger( 'encapsulateSelection', [ options.pre, options.peri, options.post, options.ownline,
 258                                                 options.replace, options.spitlines ] );
 259                                 } );
 260                         },
 261                         /**
 262                          * Ported from Wikia's LinkSuggest extension
 263                          * https://svn.wikia-code.com/wikia/trunk/extensions/wikia/LinkSuggest
 264                          * Some code copied from
 265                          * http://www.dedestruct.com/2008/03/22/howto-cross-browser-cursor-position-in-textareas/
 266                          *
 267                          * Get the position (in resolution of bytes not necessarily characters)
 268                          * in a textarea
 269                          *
 270                          * Will focus the textarea in some browsers (IE/Opera)
 271                          *
 272                          * FIXME document the options parameters
 273                          */
 274                         getCaretPosition: function ( options ) {
 275                                 function getCaret( e ) {
 276                                         var caretPos = 0,
 277                                                 endPos = 0,
 278                                                 preText, rawPreText, periText,
 279                                                 rawPeriText, postText,
 280                                                 // IE Support
 281                                                 preFinished,
 282                                                 periFinished,
 283                                                 postFinished,
 284                                                 // Range containing text in the selection
 285                                                 periRange,
 286                                                 // Range containing text before the selection
 287                                                 preRange,
 288                                                 // Range containing text after the selection
 289                                                 postRange;
 290
 291                                         if ( e && document.selection && document.selection.createRange ) {
 292                                                 // IE doesn't properly report non-selected caret position through
 293                                                 // the selection ranges when textarea isn't focused. This can
 294                                                 // lead to saving a bogus empty selection, which then screws up
 295                                                 // whatever we do later (bug 31847).
 296                                                 activateElementOnIE( e );
 297
 298                                                 preFinished = false;
 299                                                 periFinished = false;
 300                                                 postFinished = false;
 301                                                 periRange = document.selection.createRange().duplicate();
 302
 303                                                 preRange = rangeForElementIE( e );
 304                                                 // Move the end where we need it
 305                                                 preRange.setEndPoint( 'EndToStart', periRange );
 306
 307                                                 postRange = rangeForElementIE( e );
 308                                                 // Move the start where we need it
 309                                                 postRange.setEndPoint( 'StartToEnd', periRange );
 310
 311                                                 // Load the text values we need to compare
 312                                                 preText = rawPreText = preRange.text;
 313                                                 periText = rawPeriText = periRange.text;
 314                                                 postText = postRange.text;
 315
 316                                                 /*
 317                                                  * Check each range for trimmed newlines by shrinking the range by 1
 318                                                  * character and seeing if the text property has changed. If it has
 319                                                  * not changed then we know that IE has trimmed a \r\n from the end.
 320                                                  */
 321                                                 do {
 322                                                         if ( !preFinished ) {
 323                                                                 if ( preRange.compareEndPoints( 'StartToEnd', preRange ) === 0 ) {
 324                                                                         preFinished = true;
 325                                                                 } else {
 326                                                                         preRange.moveEnd( 'character', -1 );
 327                                                                         if ( preRange.text === preText ) {
 328                                                                                 rawPreText += '\r\n';
 329                                                                         } else {
 330                                                                                 preFinished = true;
 331                                                                         }
 332                                                                 }
 333                                                         }
 334                                                         if ( !periFinished ) {
 335                                                                 if ( periRange.compareEndPoints( 'StartToEnd', periRange ) === 0 ) {
 336                                                                         periFinished = true;
 337                                                                 } else {
 338                                                                         periRange.moveEnd( 'character', -1 );
 339                                                                         if ( periRange.text === periText ) {
 340                                                                                 rawPeriText += '\r\n';
 341                                                                         } else {
 342                                                                                 periFinished = true;
 343                                                                         }
 344                                                                 }
 345                                                         }
 346                                                         if ( !postFinished ) {
 347                                                                 if ( postRange.compareEndPoints( 'StartToEnd', postRange ) === 0 ) {
 348                                                                         postFinished = true;
 349                                                                 } else {
 350                                                                         postRange.moveEnd( 'character', -1 );
 351                                                                         if ( postRange.text !== postText ) {
 352                                                                                 postFinished = true;
 353                                                                         }
 354                                                                 }
 355                                                         }
 356                                                 } while ( ( !preFinished || !periFinished || !postFinished ) );
 357                                                 caretPos = rawPreText.replace( /\r\n/g, '\n' ).length;
 358                                                 endPos = caretPos + rawPeriText.replace( /\r\n/g, '\n' ).length;
 359                                         } else if ( e && ( e.selectionStart || e.selectionStart === 0 ) ) {
 360                                                 // Firefox support
 361                                                 caretPos = e.selectionStart;
 362                                                 endPos = e.selectionEnd;
 363                                         }
 364                                         return options.startAndEnd ? [ caretPos, endPos ] : caretPos;
 365                                 }
 366                                 return getCaret( this.get( 0 ) );
 367                         },
 368                         /**
 369                          * FIXME document the options parameters
 370                          */
 371                         setSelection: function ( options ) {
 372                                 return this.each( function () {
 373                                         var selection, length, newLines;
 374                                         // Do nothing if hidden
 375                                         if ( !$( this ).is( ':hidden' ) ) {
 376                                                 if ( this.selectionStart || this.selectionStart === 0 ) {
 377                                                         // Opera 9.0 doesn't allow setting selectionStart past
 378                                                         // selectionEnd; any attempts to do that will be ignored
 379                                                         // Make sure to set them in the right order
 380                                                         if ( options.start > this.selectionEnd ) {
 381                                                                 this.selectionEnd = options.end;
 382                                                                 this.selectionStart = options.start;
 383                                                         } else {
 384                                                                 this.selectionStart = options.start;
 385                                                                 this.selectionEnd = options.end;
 386                                                         }
 387                                                 } else if ( document.body.createTextRange ) {
 388                                                         selection = rangeForElementIE( this );
 389                                                         length = this.value.length;
 390                                                         // IE doesn't count \n when computing the offset, so we won't either
 391                                                         newLines = this.value.match( /\n/g );
 392                                                         if ( newLines ) {
 393                                                                 length = length - newLines.length;
 394                                                         }
 395                                                         selection.moveStart( 'character', options.start );
 396                                                         selection.moveEnd( 'character', -length + options.end );
 397
 398                                                         // This line can cause an error under certain circumstances (textarea empty, no selection)
 399                                                         // Silence that error
 400                                                         try {
 401                                                                 selection.select();
 402                                                         } catch ( e ) { }
 403                                                 }
 404                                         }
 405                                 } );
 406                         },
 407                         /**
 408                          * Ported from Wikia's LinkSuggest extension
 409                          * https://svn.wikia-code.com/wikia/trunk/extensions/wikia/LinkSuggest
 410                          *
 411                          * Scroll a textarea to the current cursor position. You can set the cursor
 412                          * position with setSelection()
 413                          *
 414                          * @param {boolean} options Whether to force a scroll even if the caret position
 415                          *  is already visible. Defaults to false
 416                          *
 417                          * FIXME document the options parameters (function body suggests options.force is a boolean, not options itself)
 418                          */
 419                         scrollToCaretPosition: function ( options ) {
 420                                 function getLineLength( e ) {
 421                                         return Math.floor( e.scrollWidth / ( $.client.profile().platform === 'linux' ? 7 : 8 ) );
 422                                 }
 423                                 function getCaretScrollPosition( e ) {
 424                                         // FIXME: This functions sucks and is off by a few lines most
 425                                         // of the time. It should be replaced by something decent.
 426                                         var i, j,
 427                                                 nextSpace,
 428                                                 text = e.value.replace( /\r/g, '' ),
 429                                                 caret = $( e ).textSelection( 'getCaretPosition' ),
 430                                                 lineLength = getLineLength( e ),
 431                                                 row = 0,
 432                                                 charInLine = 0,
 433                                                 lastSpaceInLine = 0;
 434
 435                                         for ( i = 0; i < caret; i++ ) {
 436                                                 charInLine++;
 437                                                 if ( text.charAt( i ) === ' ' ) {
 438                                                         lastSpaceInLine = charInLine;
 439                                                 } else if ( text.charAt( i ) === '\n' ) {
 440                                                         lastSpaceInLine = 0;
 441                                                         charInLine = 0;
 442                                                         row++;
 443                                                 }
 444                                                 if ( charInLine > lineLength ) {
 445                                                         if ( lastSpaceInLine > 0 ) {
 446                                                                 charInLine = charInLine - lastSpaceInLine;
 447                                                                 lastSpaceInLine = 0;
 448                                                                 row++;
 449                                                         }
 450                                                 }
 451                                         }
 452                                         nextSpace = 0;
 453                                         for ( j = caret; j < caret + lineLength; j++ ) {
 454                                                 if (
 455                                                         text.charAt( j ) === ' ' ||
 456                                                         text.charAt( j ) === '\n' ||
 457                                                         caret === text.length
 458                                                 ) {
 459                                                         nextSpace = j;
 460                                                         break;
 461                                                 }
 462                                         }
 463                                         if ( nextSpace > lineLength && caret <= lineLength ) {
 464                                                 charInLine = caret - lastSpaceInLine;
 465                                                 row++;
 466                                         }
 467                                         return ( $.client.profile().platform === 'mac' ? 13 : ( $.client.profile().platform === 'linux' ? 15 : 16 ) ) * row;
 468                                 }
 469                                 return this.each( function () {
 470                                         var scroll, range, savedRange, pos, oldScrollTop;
 471                                         // Do nothing if hidden
 472                                         if ( !$( this ).is( ':hidden' ) ) {
 473                                                 if ( this.selectionStart || this.selectionStart === 0 ) {
 474                                                         // Mozilla
 475                                                         scroll = getCaretScrollPosition( this );
 476                                                         if ( options.force || scroll < $( this ).scrollTop() ||
 477                                                                         scroll > $( this ).scrollTop() + $( this ).height() ) {
 478                                                                 $( this ).scrollTop( scroll );
 479                                                         }
 480                                                 } else if ( document.selection && document.selection.createRange ) {
 481                                                         // IE / Opera
 482                                                         /*
 483                                                          * IE automatically scrolls the selected text to the
 484                                                          * bottom of the textarea at range.select() time, except
 485                                                          * if it was already in view and the cursor position
 486                                                          * wasn't changed, in which case it does nothing. To
 487                                                          * cover that case, we'll force it to act by moving one
 488                                                          * character back and forth.
 489                                                          */
 490                                                         range = document.body.createTextRange();
 491                                                         savedRange = document.selection.createRange();
 492                                                         pos = $( this ).textSelection( 'getCaretPosition' );
 493                                                         oldScrollTop = this.scrollTop;
 494                                                         range.moveToElementText( this );
 495                                                         range.collapse();
 496                                                         range.move( 'character', pos + 1 );
 497                                                         range.select();
 498                                                         if ( this.scrollTop !== oldScrollTop ) {
 499                                                                 this.scrollTop += range.offsetTop;
 500                                                         } else if ( options.force ) {
 501                                                                 range.move( 'character', -1 );
 502                                                                 range.select();
 503                                                         }
 504                                                         savedRange.select();
 505                                                 }
 506                                         }
 507                                         $( this ).trigger( 'scrollToPosition' );
 508                                 } );
 509                         }
 510                 };
 511
 512                 alternateFn = $( this ).data( 'jquery.textSelection' );
 513
 514                 // Apply defaults
 515                 switch ( command ) {
 516                         // case 'getContents': // no params
 517                         // case 'setContents': // no params with defaults
 518                         // case 'getSelection': // no params
 519                         case 'encapsulateSelection':
 520                                 options = $.extend( {
 521                                         pre: '', // Text to insert before the cursor/selection
 522                                         peri: '', // Text to insert between pre and post and select afterwards
 523                                         post: '', // Text to insert after the cursor/selection
 524                                         ownline: false, // Put the inserted text on a line of its own
 525                                         replace: false, // If there is a selection, replace it with peri instead of leaving it alone
 526                                         selectPeri: true, // Select the peri text if it was inserted (but not if there was a selection and replace==false, or if splitlines==true)
 527                                         splitlines: false, // If multiple lines are selected, encapsulate each line individually
 528                                         selectionStart: undefined, // Position to start selection at
 529                                         selectionEnd: undefined // Position to end selection at. Defaults to start
 530                                 }, options );
 531                                 break;
 532                         case 'getCaretPosition':
 533                                 options = $.extend( {
 534                                         // Return [start, end] instead of just start
 535                                         startAndEnd: false
 536                                 }, options );
 537                                 // FIXME: We may not need character position-based functions if we insert markers in the right places
 538                                 break;
 539                         case 'setSelection':
 540                                 options = $.extend( {
 541                                         // Position to start selection at
 542                                         start: undefined,
 543                                         // Position to end selection at. Defaults to start
 544                                         end: undefined
 545                                 }, options );
 546
 547                                 if ( options.end === undefined ) {
 548                                         options.end = options.start;
 549                                 }
 550                                 // FIXME: We may not need character position-based functions if we insert markers in the right places
 551                                 break;
 552                         case 'scrollToCaretPosition':
 553                                 options = $.extend( {
 554                                         force: false // Force a scroll even if the caret position is already visible
 555                                 }, options );
 556                                 break;
 557                         case 'register':
 558                                 if ( alternateFn ) {
 559                                         throw new Error( 'Another textSelection API was already registered' );
 560                                 }
 561                                 $( this ).data( 'jquery.textSelection', options );
 562                                 // No need to update alternateFn as this command only stores the options.
 563                                 // A command that uses it will set it again.
 564                                 return;
 565                         case 'unregister':
 566                                 $( this ).removeData( 'jquery.textSelection' );
 567                                 return;
 568                 }
 569
 570                 context = $( this ).data( 'wikiEditor-context' );
 571                 hasWikiEditor = ( context !== undefined && context.$iframe !== undefined );
 572
 573                 // IE selection restore voodoo
 574                 needSave = false;
 575                 if ( hasWikiEditor && context.savedSelection !== null ) {
 576                         context.fn.restoreSelection();
 577                         needSave = true;
 578                 }
 579                 retval = ( alternateFn && alternateFn[ command ] || fn[ command ] ).call( this, options );
 580                 if ( hasWikiEditor && needSave ) {
 581                         context.fn.saveSelection();
 582                 }
 583
 584                 return retval;
 585         };
 586
 587 }( jQuery ) );