jquery----TextArea高度自适应

//最小高度和最大高度默认

02  $("#textarea1").textareaAutoHeight();

03  //最大高度为100px

04  $("#textarea2").textareaAutoHeight({ maxHeight:100 });

05  //最小高度为50px，最大高度为200px

06  $("#textarea3").textareaAutoHeight({ minHeight:50, maxHeight:200 });

07 

08$.fn.extend({

09    textareaAutoHeight:function (options) {

10        this._options = {

11            minHeight: 0,

12            maxHeight: 1000

13        }

14 

15        this.init =function () {

16            for(var p in options) {

17                this._options[p] = options[p];

18            }

19            if(this._options.minHeight == 0) {

20                this._options.minHeight=parseFloat($(this).height());

21            }

22            for(var p in this._options) {

23                if($(this).attr(p) ==null) {

24                    $(this).attr(p,this._options[p]);

25                }

26            }

27            $(this).keyup(this.resetHeight).change(this.resetHeight)

28            .focus(this.resetHeight);

29        }

30        this.resetHeight =function () {

31            var_minHeight = parseFloat($(this).attr("minHeight"));

32            var_maxHeight = parseFloat($(this).attr("maxHeight"));

33 

34            if(!$.browser.msie) {

35                $(this).height(0);

36            }

37            varh = parseFloat(this.scrollHeight);

38            h = h < _minHeight ? _minHeight :

39                        h > _maxHeight ? _maxHeight : h;

40            $(this).height(h).scrollTop(h);

41            if(h >= _maxHeight) {

42                $(this).css("overflow-y","scroll");

43            }

44            else{

45                $(this).css("overflow-y","hidden");

46            }

47        }

48        this.init();

49    }

50});