Cacher is the code snippet organizer for pro developers

<h2>jQuery input filter showcase</h2>
<p>Supports Copy+Paste, Drag+Drop, keyboard shortcuts, context menu operations, non-typeable keys, the caret position, different keyboard layouts, and <a href="https://caniuse.com/#feat=input-event" target="_blank">all browsers since IE 9</a>.</p>
<p>There is also a <a href="https://jsfiddle.net/emkey08/zgvtjc51" target="_blank">pure JavaScript version</a> of this (without jQuery).</p>
<table>
  <tr><td>Integer</td><td><input id="intTextBox"></td></tr>
  <tr><td>Integer &gt;= 0</td><td><input id="uintTextBox"></td></tr>
  <tr><td>Integer &gt;= 0 and &lt;= 500</td><td><input id="intLimitTextBox"></td></tr>
  <tr><td>Float (use . or , as decimal separator)</td><td><input id="floatTextBox"></td></tr>
  <tr><td>Currency (at most two decimal places)</td><td><input id="currencyTextBox"></td></tr>
  <tr><td>A-Z only</td><td><input id="latinTextBox"></td></tr>
  <tr><td>Hexadecimal</td><td><input id="hexTextBox"></td></tr>
</table>

https://jsfiddle.net/emkey08/tvx5e7q3

// Restricts input for each element in the set of matched elements to the given inputFilter.
(function($) {
  $.fn.inputFilter = function(inputFilter) {
    return this.on("input keydown keyup mousedown mouseup select contextmenu drop", function() {
      if (inputFilter(this.value)) {
        this.oldValue = this.value;
        this.oldSelectionStart = this.selectionStart;
        this.oldSelectionEnd = this.selectionEnd;
      } else if (this.hasOwnProperty("oldValue")) {
        this.value = this.oldValue;
        this.setSelectionRange(this.oldSelectionStart, this.oldSelectionEnd);
      } else {
        this.value = "";
      }
    });
  };
}(jQuery));


// Install input filters.
$("#intTextBox").inputFilter(function(value) {
  return /^-?\d*$/.test(value); });
$("#uintTextBox").inputFilter(function(value) {
  return /^\d*$/.test(value); });
$("#intLimitTextBox").inputFilter(function(value) {
  return /^\d*$/.test(value) && (value === "" || parseInt(value) <= 500); });
$("#floatTextBox").inputFilter(function(value) {
  return /^-?\d*[.,]?\d*$/.test(value); });
$("#currencyTextBox").inputFilter(function(value) {
  return /^-?\d*[.,]?\d{0,2}$/.test(value); });
$("#latinTextBox").inputFilter(function(value) {
  return /^[a-z]*$/i.test(value); });
$("#hexTextBox").inputFilter(function(value) {
  return /^[0-9a-f]*$/i.test(value); });