function unlockAccount(val) {
var accounts = web3.eth.coinbase;
var passphrase = val;
if(passphrase !=null){
web3.personal.unlockAccount(web3.eth.coinbase, passphrase,1000, function (error, result){
    if(error){
    var str =error.toString();
    if(str.includes("could not decrypt")){
        bootbox.hideAll();
        document.getElementById("loading").style.display = "none";
        document.getElementById("successAlert").style.display = "none";
        if(document.getElementById("dangerAlert")){
            document.getElementById("dangerAlert").style.display = "none";
        }
        bootbox.alert("Please enter the valid Passphrase.! ");
    }
    }
  });
 }
}

web3.personal.unlockAccount("0x..", "<pass>");