https://js.do/powenko/04-inputstringlengthutf8
[php]
<script src="//ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>
<style>
.input_area span{
display:block;
float:left;
width:100px;
text-overflow:ellipsis;
overflow:hidden;
}
</style>

<div class="input_row clearfix">
<label>Account</label>
<div class="input_area">
<input type="text" class="input_field" size="2">
<span title="thisisacompanythisisacompany">@thisisacompanythisisacompany</span>
</div>
</div>
<script>
// Edit your script here
function stringBytes(c){
var n=c.length,s;
var len=0;
for(var i=0; i <n;i++){
s=c.charCodeAt(i);
while( s > 0 ){
len++;
s = s >> 8;
}
}
return len;
}
function resizeInput() {
$length=$(this).val().length;
if($length==0){
$(this).attr(‘size’, 2);
}else if($length<15){
$(this).attr(‘size’,stringBytes( $(this).val()));
}else{
$(this).attr(‘size’, 15);
}
}
$(‘.input_field’)
// event handler
.keyup(resizeInput)
// resize on page load
.each(resizeInput);

</script>
<!– edit your html here –>

[/php]