how to stay on same page after alert in JavaScript

Question

onClick=validateForm()

it shows alert if it is blank but it goes to next page("action=some.php") so any idea how to be on same page after alert?

function validateForm() {    

  var x = document.forms["uploadForm"]["userImage"].value;    

  if (x == "") {           

    alert("Choose the file !!!!!");

    return false;

  }

  var p = document.forms["uploadForm"]["Start_Date"].value;

  var q = document.forms["uploadForm"]["End_Date"].value;

  if (p == "" && q=="") {

    alert("Select the date !!!!!");

    return false;   

  }

  var radio = document.forms["uploadForm"]["radio"].value;

  if (radio == "") {

    alert("Select the Radio !!!!!");

    return false;

  }     

}

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Answer 1

I used onClick="return validateForm()" in place of onClick=validateForm(). Thank you so much @epascarello for your quick answer.

how to stay on same page after alert in JavaScript

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