javascript - Exclude some file extension from upload dialog -

i need allow select file dialog accept file type except specific type, example need make dialog displays except .exe files,

i see question exist , have answer. please check bellow link validation of file extension before uploading file

var _validfileextensions = [".jpg", ".jpeg", ".bmp", ".gif", ".png"];      function validate(oform) {      var arrinputs = oform.getelementsbytagname("input");      (var = 0; < arrinputs.length; i++) {          var oinput = arrinputs[i];          if (oinput.type == "file") {              var sfilename = oinput.value;              if (sfilename.length > 0) {                  var blnvalid = false;                  (var j = 0; j < _validfileextensions.length; j++) {                      var scurextension = _validfileextensions[j];                      if (sfilename.substr(sfilename.length - scurextension.length, scurextension.length).tolowercase() == scurextension.tolowercase()) {                          blnvalid = true;                          break;                      }                  }                                    if (!blnvalid) {                      alert("sorry, " + sfilename + " invalid, allowed extensions are: " + _validfileextensions.join(", "));                      return false;                  }              }          }      }          return true;  }

<form onsubmit="return validate(this);">    file: <input type="file" name="my file" /><br />    <input type="submit" value="submit" />  </form>