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 3 Answer(s)

  • // Restricts input for the given textbox to the given inputFilter.
    function setInputFilter(textbox, inputFilter) {
      ["input", "keydown", "keyup", "mousedown", "mouseup", "select", "contextmenu", "drop"].forEach(function(event) {
        textbox.oldValue = "";
        textbox.addEventListener(event, 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);
    // Restrict input to digits and '.' by using a regular expression filter.
    setInputFilter(document.getElementById("myTextBox"), function(value) {
      return /^\d*\.?\d*$/.test(value);
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