Jquery implements imitation of Sina Weibo to obtain the code of the number of words that can be entered in the text box_jquery

limit.js code

Copy code The code is as follows:

// txt: text box jquery object
//limit: limited number of words
// isbyte: true: treat limit as number of bytes; false: treat limit as number of characters
// cb: callback function, parameters is the number of words that can be input
function InitLimit(txt,limit,isbyte,cb){
txt.keyup(function(){
var str=txt.val();
var charLen;
var byteLen=0;
if(isbyte){//Original blog: blog.csdn.net/bluceyoung
for(var i=0;iif (str.charCodeAt(i)>255){
byteLen =2;
}else{
byteLen;
}
}
charLen = Math.floor((limit- byteLen)/2);
}else{
byteLen=str.length;
charLen=limit-byteLen;
}
cb(charLen);
});
}

Page code:

Copy code The code is as follows:

< ;script type="text/javascript">
$(document).ready(function(){
InitLimit($("#txt"),10,true,function(c){
if(c>=0){
$("#show").val("You can also enter " c "characters");
}else{
$("#show"). val("has exceeded" (-c) "characters");
}
});

InitLimit($("#txt1"),10,true,function(c) {
if(c>=0){
$("#show1").val("You can also enter " c " characters");
}else{
$("# show1").val("Exceeded" (-c) "characters");
}
});
});