Sending a var with file, accessing it in script & Displaying a hidden div

Currently there is a form in home page which allows us to submit data. After data is saved, displaying the same .html page but different div (message like - Congrts, your poll is created ....). For this I am sending a boolean var dataSaved while sending file so that i can retrieve the boolean var & display the div.

My server.js looks like this -

app.post('/home/newPoll', function (req, res) {  
    const newPoll = new PollModel({
    ............//something here
    });
    PollModel(newPoll).save(function(error, data){
          if (error) {
            throw error;
            console.error("User Data is not saved."+error);
          } else {
            console.log("User data saved successfully");// working fine
            res.sendFile(__dirname+'/views/home.html', {dataSaved: true}); // this page is displayed also
          }
        });
    });

if this var dataSaved is true, I want to display the div.

$(document).ready(function(){
    ............// some more code here, are working fine. 
    const dataSaved = <%= dataSaved %>;
    console.log(dataSaved); // not getting this
    if (dataSaved ) {
       $("#newPollDiv").hide();
       $("#myPollDiv").hide();
       $("#pollCreated").show();
    }
}

I am not using any view template.

kindly suggest, also if any other way to do this.

via jay thakur