javascript - How to make user to paste only digits into a text area box? -


i have requirement make textarea field allow digits , enter keys can checked with,

 function validate(key) {      // getting key code of pressed key     var keycode = (key.which) ? key.which : key.keycode;     var phn = document.getelementbyid('textarea');     // comparing pressed keycodes     if ((keycode < 48 || keycode > 57) && keycode !== 13) {         return false;     }   }  <div> <textarea id="textarea" rows="4" cols="50"  onkeypress="return validate(event)" /> </div>

but functionality breaks if user copy-paste text area field. how can make user paste if has copied digits only, i.e

13131331        -        should pasted 2wewewe12       -        should not pasted

i don't javascript. kindly suggest something?

jquery reading input of pasted string:

$input = $("textarea"); $input.on("input", function(){     var value = $(this).val();     if ( ! isnan(parseint(value)))          $(this).val(""); });

each time either enter character, or paste text area, check see if value of text area numeric. if is, keep it, else dump entire contents , make empty string.


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