jquery textarealimit IE

/**

 * 解决IE中textarea标签中不识别maxlength属性的解决方法

 * 

 * 调用方式：$("#ID").textarealimit({length:20}); //length 具体的值根据需要设置

 */

 

(function($) {

$.fn.textarealimit = function(settings) {

settings = jQuery.extend({

length : 10

}, settings);

maxLength = settings.length;

$(this).attr("maxlength", maxLength).bind("keydown", doKeydown).bind(

"keypress", doKeypress).bind("beforepaste", doBeforePaste)

.bind("paste", doPaste);

function doKeypress() {

var oTR = document.selection.createRange()

if (oTR.text.length >= 1)

event.returnValue = true

else if (this.value.length > maxLength - 1)

event.returnValue = false

}

function doKeydown() {

var _obj = this;

setTimeout(function() {

if (_obj.value.length > maxLength - 1) {

var oTR = window.document.selection.createRange()

oTR.moveStart("character", -1

* (_obj.value.length - maxLength))

oTR.text = ""

}

}, 1)

}

function doBeforePaste() {

event.returnValue = false

}

function doPaste() {

event.returnValue = false

var oTR = document.selection.createRange()

var iInsertLength = maxLength - this.value.length + oTR.text.length

var sData = window.clipboardData.getData("Text").substr(0,

iInsertLength)

oTR.text = sData;

}

}

})(jQuery);