* Checks document order of two siblings * @param {Element} a * @param {Element} b * @returns {Number} Returns less than 0 if a precedes b, greater than 0 if a follows b
( a, b )
| 376 | * @returns {Number} Returns less than 0 if a precedes b, greater than 0 if a follows b |
| 377 | */ |
| 378 | function siblingCheck( a, b ) { |
| 379 | var cur = b && a, |
| 380 | diff = cur && a.nodeType === 1 && b.nodeType === 1 && |
| 381 | ( ~b.sourceIndex || MAX_NEGATIVE ) - |
| 382 | ( ~a.sourceIndex || MAX_NEGATIVE ); |
| 383 | |
| 384 | // Use IE sourceIndex if available on both nodes |
| 385 | if ( diff ) { |
| 386 | return diff; |
| 387 | } |
| 388 | |
| 389 | // Check if b follows a |
| 390 | if ( cur ) { |
| 391 | while ( (cur = cur.nextSibling) ) { |
| 392 | if ( cur === b ) { |
| 393 | return -1; |
| 394 | } |
| 395 | } |
| 396 | } |
| 397 | |
| 398 | return a ? 1 : -1; |
| 399 | } |
| 400 | |
| 401 | /** |
| 402 | * Returns a function to use in pseudos for input types |