jQuery textarea text box input text word limit prompt code
jQuery textarea text box input text word limit prompt code
<script type="text/javascript">
//Display restricted input characters method
function textAreaChange(obj){
var $this = $(obj);
var count_total = $this.next().children('span').text();
var count_input = $this.next().children('em');
var area_val = $this.val();
if(area_val.len()>count_total){
area_val = autoAddEllipsis(area_val,count_total); //According to the byte screenshot content
$this.val(area_val);
count_input.text(0);//Display the number that can be entered
}else{
count_input.text(count_total - area_val.len());//Display the number that can be entered
}
}
//Get the byte length of the string
String.prototype.len = function(){
return this.replace(/[^\x00-\xff]/g, "xx").length;
};
/*
* Process too long strings, intercept and add ellipses
* Note: The half-width length is 1 and the full-width length is 2
* pStr: string
* pLen: intercept length
* return: intercepted string
*/
function autoAddEllipsis(pStr, pLen) {
var _ret = cutString(pStr, pLen);
var _cutFlag = _ret.cutflag;
var _cutStringn = _ret.cutstring;
return _cutStringn;
}
/*
* Get a string of specified length
* Note: The half-width length is 1 and the full-width length is 2
* pStr: string
* pLen: intercept length
* return: intercepted string
*/
function cutString(pStr, pLen) {
// Original string length
var _strLen = pStr.length;
var _tmpCode;
var _cutString;
// By default, the returned string is part of the original string
var _cutFlag = "1";
var_lenCount = 0;
var _ret = false;
if (_strLen <= pLen/2){_cutString = pStr;_ret = true;}
if (!_ret){
for (var i = 0; i < _strLen ; i++ ){
if (isFull(pStr.charAt(i))){_lenCount += 2;}
else {_lenCount += 1;}
if (_lenCount > pLen){_cutString = pStr.substring(0, i);_ret = true;break;}
else if(_lenCount == pLen){_cutString = pStr.substring(0, i + 1);_ret = true;break;}
}
}
if (!_ret){_cutString = pStr;_ret = true;}
if (_cutString.length == _strLen){_cutFlag = "0";}
return {"cutstring":_cutString, "cutflag":_cutFlag};
}
/*
* Determine whether it is full-width
*
* pChar: a string of length 1
* return: true: full width
* false: half-width
*/
function isFull (pChar){
if((pChar.charCodeAt(0) > 128)){return true;}
else{return false;}
}
</script>
jQuery textarea text area text box input word limit prompt code, set fixed input characters, real-time calculation and display of how many characters have been entered.
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