| 1 | /* * jQuery autoResizeTextAreaQ plugin * @requires jQuery v1.4.2 or later * * Copyright (c) 2010 M. Brown (mbrowniebytes A gmail.com) * Licensed under the Revised BSD license: * http://www.opensource.org/licenses/bsd-license.php * http://en.wikipedia.org/wiki/BSD_licenses * * Versions: * 0.1 - 2010-07-21 * initial * * usage: * $(document).ready( function() { * $('textarea').autoResizeTextAreaQ({"max_rows":8}); * }); * */(function($) { $.fn.autoResizeTextAreaQ = function(options) { var opts = $.extend({ // ya prob want to use max_rows: 10, // # - max rows to resize too // ya may want to use, but defaults should be ok extra_rows: 1, // # - nbr extra rows after last line ie padding; 0|1 optimal // ya should really specify in html rows: null, // null|# - null infer from html; # override html cols: null, // null|# - null infer from html; # override html debug: false // true|false - turn on|off console.log() }, options); // extra padding based on browser if ($.browser.msie) { opts.extra_rows += 1; } else if ($.browser.webkit) { opts.extra_rows += 1; } // else $.browser.mozilla // iterate over passed in selector, only process actual textareas return $(this).filter('textarea').each(function(index) { var ta = $(this); var orig = {}; // textarea rows cols current state if (opts.cols != null && opts.cols > 0) { ta.attr('cols', opts.cols); } orig.cols = ta.attr('cols'); if (opts.rows != null && opts.rows > 0) { ta.attr('rows', opts.rows); } orig.rows = ta.attr('rows'); // validate max extra_rows if (opts.max_rows == null || opts.max_rows < orig.rows) { opts.max_rows = orig.rows; } if (opts.extra_rows == null || opts.extra_rows < 0) { opts.extra_rows = 0; } if (opts.debug) { console.log('opts: ', opts, ' orig: ', orig); } // resize textares on load resize(ta, orig); // check resize on key input ta.bind('keyup', function(e) { resize(ta, orig); }); }); // end each() function resize(ta, orig) { // nbr explicit rows var nl_rows = ta.val().split('\n'); // nbr inferred rows var nbr_ta_rows = 0; for (index in nl_rows) { // overly simple check to account for text being auto wrapped and thus a new line nbr_ta_rows += Math.floor((nl_rows[index].length / orig.cols)) + 1; } // get final nbr ta rows var final_nbr_ta_rows = nbr_ta_rows - 1; // deduct for current line final_nbr_ta_rows += opts.extra_rows; // add on extra rows // resize textarea // note: $.animate() doesnt work well here since only inc/dec row by one if (final_nbr_ta_rows >= opts.max_rows) { ta.attr('rows', opts.max_rows); } else if (final_nbr_ta_rows >= orig.rows) { ta.attr('rows', final_nbr_ta_rows); } else { ta.attr('rows', orig.rows); } if (opts.debug) { console.log('rows: ', ta.attr('rows'), ' nbr nl_rows: ', nl_rows.length, ' nbr_ta_rows: ', nbr_ta_rows, ' final_nbr_ta_rows: ', final_nbr_ta_rows); } } // end resize()}; // end autoResizeTextAreaQ()})(jQuery); |
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