Stop user from typing into input field after certain character limit with PURE JAVASCRIPT -

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i have use js. assignment.

this code:

var bio = document.getelementbyid('bio'); var charsleft = document.getelementbyid('charsleft'); bio.onkeypress = function(evt) {     evt = evt || window.event;     var remaining;     var perm = bio.value;     remaining = 139 - bio.value.length;     charsleft.innerhtml = remaining;     if (remaining == 0) {         bio.value = perm;     } }

it not stop user typing stuff after charsleft 0.

please not mark duplicate!

this pure javascript approach find

you dont need javascript :

<input type="text" name="fieldname" maxlength="100">

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