所以我有下面的标准 textarea 自动增长代码,我已将其更改为绑定输入属性更改以捕获粘贴。
(function($)
{
$.fn.autogrow = function(options)
{
return this.filter('textarea').each(function()
{
var self = this;
var $self = $(self);
var minHeight = $self.height();
var noFlickerPad = $self.hasClass('autogrow-short') ? 0 : parseInt($self.css('lineHeight')) || 0;
var settings = $.extend({
preGrowCallback: null,
postGrowCallback: null
}, options );
var shadow = $('<div></div>').css({
position: 'absolute',
top: -10000,
left: -10000,
width: $self.width(),
fontSize: $self.css('fontSize'),
fontFamily: $self.css('fontFamily'),
fontWeight: $self.css('fontWeight'),
lineHeight: $self.css('lineHeight'),
resize: 'none',
'word-wrap': 'break-word'
}).appendTo(document.body);
$self.bind('input propertychange', function()
{
var times = function(string, number)
{
for (var i=0, r=''; i<number; i++) r += string;
return r;
};
var val = self.value.replace(/&/g, '&')
.replace(/</g, '<')
.replace(/>/g, '>')
.replace(/\n$/, '<br/> ')
.replace(/\n/g, '<br/>')
.replace(/ {2,}/g, function(space){ return times(' ', space.length - 1) + ' ' });
// Did enter get pressed? Resize in this keydown event so that the flicker doesn't occur.
if (event && event.data && event.data.event === 'keydown' && event.keyCode === 13) {
val += '<br />';
}
shadow.css('width', $self.width());
shadow.html(val + (noFlickerPad === 0 ? '...' : '')); // Append '...' to resize pre-emptively.
var newHeight=Math.max(shadow.height() + noFlickerPad, minHeight);
if(settings.preGrowCallback!=null){
newHeight=settings.preGrowCallback($self,shadow,newHeight,minHeight);
}
$self.height(newHeight);
if(settings.postGrowCallback!=null){
settings.postGrowCallback($self);
}
});
});
};
})(jQuery);
我一直试图让初始化时的 textarea 与文本的高度相同。我见过人们使用各种方式,例如
$(this).height(0).height(this.scrollHeight);
这行不通。我所做的另一件事是模仿 textarea 的 keydown 事件,它肯定会扩展 textarea,但它最终会在文本之后出现很多空白并且太大。
关于如何确保 textarea 即使在初始化时也适合文本的任何建议?谢谢。