javascript - Input Validation - How to allow backspace to work in my method -

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i have function allow input field receive numbers , decimal point. how can allow backspace key ?

function verifiercaracteres(event) {    var keycode = event.which ? event.which : event.keycode;   var touche = string.fromcharcode(keycode);    var champ = document.getelementbyid('mon_input');    var caracteres = '.0123456789';    if(caracteres.indexof(touche) >= 0) {     champ.value += touche;   }  }

and html:

<input type="text" name="patient_amount" id="mon_input" onkeypress="verifiercaracteres(event); return false;"/>

use keycode == 8 in validation. 8 keycode backspace.

really, job regex , replace. how typically go process. here example.

function verifiercaracteres() {     var inputele = document.getelementbyid("mon_input");     var value = inputele.value;     inputele.value = value.replace(/([^0-9\.])+/g,''); }

this remove characters input not 0-9 or .


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