$.fn.extend({
textareaAutoHeight: function (options) {
this._options = {
minHeight: 0,
maxHeight: 300,
lineHeight: 24
}
this.init = function () {
for (var p in options) {
this._options[p] = options[p];
}
if (this._options.minHeight == 0) {
this._options.minHeight=parseFloat($(this).height());
}
for (var p in this._options) {
if ($(this).attr(p) == null) {
$(this).attr(p, this._options[p]);
}
}
$(this).keyup(this.resetHeight).change(this.resetHeight).focus(this.resetHeight);
}
this.resetHeight = function (e) {
var _minHeight = parseFloat($(this).attr("minHeight"));
var _maxHeight = parseFloat($(this).attr("maxHeight"));
var _lineHeight = parseFloat($(this).attr("lineHeight"));
if (!$.browser.msie) {
$(this).height(0);
}
var h = parseFloat(this.scrollHeight);
h = h < _minHeight ? _minHeight :
h > _maxHeight ? _maxHeight : (h+_lineHeight);
$(this).height(h);
if (h >= _maxHeight) {
$(this).css("overflow-y", "scroll");
}
else {
$(this).css("overflow-y", "hidden");
}
}
this.init();
}
});
//应用案例:
$(function(){
$('#ftsty').textareaAutoHeight({});
});