friendica-github/view/theme/smoothly/js/jquery.autogrow.textarea.js
2019-02-12 17:27:14 +01:00

50 lines
1.6 KiB
JavaScript

// @license magnet:?xt=urn:btih:d3d9a9a6595521f9666a5e94cc830dab83b65699&dn=expat.txt Expat
// source https://github.com/jaz303/jquery-grab-bag
(function($) {
/*
* Auto-growing textareas; technique ripped from Facebook
*/
$.fn.autogrow = function(options) {
this.filter('textarea').each(function() {
var $this = $(this),
minHeight = $this.height(),
lineHeight = $this.css('lineHeight');
var shadow = $('<div></div>').css({
position: 'absolute',
top: -10000,
left: -10000,
width: $(this).width(),
fontSize: $this.css('fontSize'),
fontFamily: $this.css('fontFamily'),
lineHeight: $this.css('lineHeight'),
resize: 'none'
}).appendTo(document.body);
var update = function() {
var val = this.value.replace(/</g, '&lt;')
.replace(/>/g, '&gt;')
.replace(/&/g, '&amp;')
.replace(/\n/g, '<br/>');
shadow.html(val);
$(this).css('height', Math.max(shadow.height() + 20, minHeight));
}
$(this).change(update).keyup(update).keydown(update);
update.apply(this);
});
return this;
}
})(jQuery);
// @license-end