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Javascript code to show the Remaining character in the text box!

Include the below javascript method in a javascript File.


function CheckLength(fn,lb,rm,mc)
{
var len=document.getElementById(fn).value.length;
if (len > mc)
{
var fn1=document.getElementById(fn).value.substring(0,mc);
document.getElementById(fn).value= fn1;
len = mc;
}
else
{
if(fn)
var rLen=mc-len;
document.getElementById(lb).innerHTML=rm + rLen;
}
}


In .aspx Page write the line to include the method from a file to page


Now Suppose this method is implemented on a text box



Place the two labels below the textbox




string Strrm = "Remaining character: ";

Now call this method on the keyup and keydown events on the textbox

txtTask.Attributes.Add("onkeyup", "CheckLength('" + txtTask.ClientID + "','" + lblramaining.ClientID + "','" + Strrm + "',500);hidelabel('" + lblmessage.ClientID + "');");


txtTask.Attributes.Add("onkeyDown", "CheckLength('" + txtTask.ClientID + "','" + lblramaining.ClientID + "','" + Strrm + "',500);hidelabel('" + lblmessage.ClientID + "');");

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